WorldWideScience

Sample records for hand vein pattern

  1. Principal Component Analysis of Thermal Dorsal Hand Vein Pattern Architecture

    Directory of Open Access Journals (Sweden)

    V. Krishna Sree

    2012-12-01

    Full Text Available The quest of providing more secure identification system has lead to rise in developing biometric systems. Biometrics such as face, fingerprint and iris have been developed extensively for human identification purpose and also to provide authentic input to many security systems in the past few decades. Dorsal hand vein pattern is an emerging biometric which is unique to every individual. In this study principal component analysis is used to obtain Eigen vein patterns which are low dimensional representation of vein pattern features. The extraction of the vein patterns was obtained by morphological techniques. Noise reduction filters are used to enhance the vein patterns. Principle component analysis is able to reduce the 2-dimensional image database into 1-dimensional Eigen vectors and able to identify all the dorsal hand pattern images.

  2. Analysis of the hand vein pattern for people recognition

    Science.gov (United States)

    Castro-Ortega, R.; Toxqui-Quitl, C.; Cristóbal, G.; Marcos, J. Victor; Padilla-Vivanco, A.; Hurtado Pérez, R.

    2015-09-01

    The shape of the hand vascular pattern contains useful and unique features that can be used for identifying and authenticating people, with applications in access control, medicine and financial services. In this work, an optical system for the image acquisition of the hand vascular pattern is implemented. It consists of a CCD camera with sensitivity in the IR and a light source with emission in the 880 nm. The IR radiation interacts with the desoxyhemoglobin, hemoglobin and water present in the blood of the veins, making possible to see the vein pattern underneath skin. The segmentation of the Region Of Interest (ROI) is achieved using geometrical moments locating the centroid of an image. For enhancement of the vein pattern we use the technique of Histogram Equalization and Contrast Limited Adaptive Histogram Equalization (CLAHE). In order to remove unnecessary information such as body hair and skinfolds, a low pass filter is implemented. A method based on geometric moments is used to obtain the invariant descriptors of the input images. The classification task is achieved using Artificial Neural Networks (ANN) and K-Nearest Neighbors (K-nn) algorithms. Experimental results using our database show a percentage of correct classification, higher of 86.36% with ANN for 912 images of 38 people with 12 versions each one.

  3. Local SIFT analysis for hand vein pattern verification

    Science.gov (United States)

    Wang, Yunxin; Wang, Dayong; Liu, Tiegen; Li, Xiuyan

    2009-11-01

    The newly emerging hand vein recognition technology has attracted remarkable attention for its uniqueness, noninvasion, friendliness and high reliability. It is unavoidable to produce small location deviation of human hand in the practical application; however, the existing recognition methods are sensitive to the hand shift or rotation. The test sample is matched with a series of registered images after affine transformation including the shift or rotation by most of researches, this affine transform method can remedy the location deviation to some extent, but the limited range for hand shift and rotation brings users much inconvenience and the computational cost also increases greatly. Aiming at this issue, a hand vein recognition algorithm based on local SIFT (Scale Invariant Feature Transform) analysis is developed in this contribution, which has practical significance due to its translation and rotation invariance. First, the hand vein image is preprocessed to remove the background and reduce image noises, and then SIFT features are extracted to describe the gradient information of hand vein. Many one-to-more matching pairs are produced by the common matching method of SIFT features, thus the matching rule is improved by appending a constrained condition to ensure the one-to-one matching, which is achieved by selecting feature point with the nearest distance as the optimal match. Finally the match ratio of features between the registered and test images is calculated as the similarity measurement to verify the personal identification. The experiment results show that FRR (False Rejection Rate) is only 0.93% when FAR (False Acceptance Rate) is 0.002%, and EER (Equal Error Rate) is low to 0.12%, which demonstrate the proposed approach is valid and effective for hand vein authentication.

  4. A New Method to Extract Dorsal Hand Vein Pattern using Quadratic Inference Function

    Directory of Open Access Journals (Sweden)

    Maleika Heenaye- Mamode Khan

    2009-12-01

    Full Text Available Among all biometric, dorsal hand vein pattern is attracting the attention of researchers, of late. Extensive research is being carried out on various techniques in the hope of finding an efficient one which can be applied on dorsal hand vein pattern to improve its accuracy and matching time. One of the crucial step in biometric is the extraction of features. In this paper, we propose a method based on quadratic inference function to the dorsal hand vein features to extract its features. The biometric system developed was tested on a database of 100 images. The false acceptance rate (FAR, false rejection rate (FRR and the matching time are being computed.

  5. A New Method to Extract Dorsal Hand Vein Pattern using Quadratic Inference Function

    CERN Document Server

    Khan, Maleika Heenaye Mamode

    2010-01-01

    Among all biometric, dorsal hand vein pattern is attracting the attention of researchers, of late. Extensive research is being carried out on various techniques in the hope of finding an efficient one which can be applied on dorsal hand vein pattern to improve its accuracy and matching time. One of the crucial step in biometric is the extraction of features. In this paper, we propose a method based on quadratic inference function to the dorsal hand vein features to extract its features. The biometric system developed was tested on a database of 100 images. The false acceptance rate (FAR), false rejection rate (FRR) and the matching time are being computed.

  6. Parallel sub-neural network system for hand vein pattern recognition

    Institute of Scientific and Technical Information of China (English)

    Xue Yuan; Yongduan Song; Xueye Wei

    2011-01-01

    @@ A hand vein authentication system in which the identity of an individual can be readily confirmed upon gripping a handle is proposed.This recognition method incorporates infrared light-emitting diode (LED) onto a door handle and sets a charge-coupled device (CCD) camera on the other side of the hand.It builds on fuzzy c-means clustering and parallel neural networks (NNs); moreover, it is expected to solve the pattern recognition problem in large-scale databases using NNs due to its self-learning and parallel processing capabilities and by effectively incorporating training patterns.The experimental results validate the efficiency of the proposed algorithm.%A hand vein authentication system in which the identity of an individual can be readily confirmed upon gripping a handle is proposed. This recognition method incorporates infrared light-emitting diode (LED)onto a door handle and sets a charge-coupled device (CCD) camera on the other side of the hand. It builds on fuzzy c-means clustering and parallel neural networks (NNs); moreover, it is expected to solve the pattern recognition problem in large-scale databases using NNs due to its self-learning and parallel processing capabilities and by effectively incorporating training patterns. The experimental results validatethe efficiency of the proposed algorithm.

  7. A multi-resolution wavelet algorithm for hand vein pattern recognition

    Institute of Scientific and Technical Information of China (English)

    Yunxin Wang; Tiegen Liu; Junfeng Jiang

    2008-01-01

    A novel hand vein recognition algorithm is developed based on multi-resolution wavelet analysis. The texture feature of hand vein can be extracted by three-level wavelet decomposition. Furthermore, Knearest neighbor (KNN) with support vector machines (SVM) and minimum distance classifier (MDC) are employed for feature matching. Finally, the experiments are respectively performed in identification and verification modes using Tianjin University (TJU) hand vein image database constructed by our group.The results show the feasibility and effectiveness of the proposed method.

  8. Hand vein recognition based on orientation of LBP

    Science.gov (United States)

    Bu, Wei; Wu, Xiangqian; Gao, Enying

    2012-06-01

    Vein recognition is becoming an effective method for personal recognition. Vein patterns lie under the skin surface of human body, and hence provide higher reliability than other biometric traits and hard to be damaged or faked. This paper proposes a novel vein feature representation method call orientation of local binary pattern (OLBP) which is an extension of local binary pattern (LBP). OLBP can represent the orientation information of the vein pixel which is an important characteristic of vein patterns. Moreover, the OLBP can also indicate on which side of the vein centerline the pixel locates. The OLBP feature maps are encoded by 4-bit binary values and an orientation distance is developed for efficient feature matching. Based on OLBP feature representation, we construct a hand vein recognition system employing multiple hand vein patterns include palm vein, dorsal vein, and three finger veins (index, middle, and ring finger). The experimental results on a large database demonstrate the effectiveness of the proposed approach.

  9. A New Multimodal Biometric System Based on Finger Vein and Hand Vein Recognition

    OpenAIRE

    Randa Boukhris Trabelsi; Alima Damak Masmoudi; Dorra Sellami Masmoudi

    2013-01-01

    As a reliable and robust biological characteristic, the vein pattern increases more and more the progress in biometric researches. Generally, it was shown that single biometric modality recognition is not able to meet high performances. In this paper, we propose a new multimodal biometric system based on fusion of both hand vein and finger vein modalities. For finger vein recognition, we employ the Monogenic Local Binary Pattern (MLBP), and for hand vein recognitionan Improved Gaussian Matche...

  10. A Dorsal Hand Vein Recognition-based on Local Gabor Phase Quantization with Whitening Transformation

    OpenAIRE

    K. Premalatha; Anantha kumar T; Natarajan A M

    2014-01-01

    The hand vein pattern is a biometric feature in which the actual pattern is the shape of the vein network and its characteristics are the vein features. This paper investigates a new approach for dorsal hand vein pattern identification from grey level dorsal hand vein information. In this study Gabor filter quadrature pair is employed to compute locally in a window for every pixel position to extract the phase information. The phases of six frequency coefficients are quantized and it is used ...

  11. Dorsal Hand Vein Biometry by Independent Component Analysis

    Directory of Open Access Journals (Sweden)

    V.H.Yadav

    2012-07-01

    Full Text Available Biometric authentication provides a high security and reliable approach to be used in security access system. Personal identification based on hand vein patterns is a newly developed recent year. The pattern of blood veins in the hand is unique to every individual, even among identical twins, and it do notchange over time. These properties of uniqueness, stability and strong immunity to forgery of the vein patterns make it a potentially good biometric trait which offers greater security and reliable features for personal identification. In this study, we have used the BOSPHORUS hand vein database which has been taken under a source of NIR infrared radiation. For feature extraction we applied appearance based method ICA which produces independent components. To control over the number of independent component we preprocessed data by PCA before applying ICA, and gives good experimental results.

  12. VeinPLUS: A Transillumination and Reflection-based Hand Vein Database

    OpenAIRE

    Gruschina, Alexander

    2015-01-01

    This paper gives a short summary of work related to the creation of a department-hosted hand vein database. After the introducing section, special properties of the hand vein acquisition are explained, followed by a comparison table, which shows key differences to existing well-known hand vein databases. At the end, the ROI extraction process is described and sample images and ROIs are presented.

  13. Hand veins feature extraction using DT-CNNS

    Science.gov (United States)

    Malki, Suleyman; Spaanenburg, Lambert

    2007-05-01

    As the identification process is based on the unique patterns of the users, biometrics technologies are expected to provide highly secure authentication systems. The existing systems using fingerprints or retina patterns are, however, very vulnerable. One's fingerprints are accessible as soon as the person touches a surface, while a high resolution camera easily captures the retina pattern. Thus, both patterns can easily be "stolen" and forged. Beside, technical considerations decrease the usability for these methods. Due to the direct contact with the finger, the sensor gets dirty, which decreases the authentication success ratio. Aligning the eye with a camera to capture the retina pattern gives uncomfortable feeling. On the other hand, vein patterns of either a palm of the hand or a single finger offer stable, unique and repeatable biometrics features. A fingerprint-based identification system using Cellular Neural Networks has already been proposed by Gao. His system covers all stages of a typical fingerprint verification procedure from Image Preprocessing to Feature Matching. This paper performs a critical review of the individual algorithmic steps. Notably, the operation of False Feature Elimination is applied only once instead of 3 times. Furthermore, the number of iterations is limited to 1 for all used templates. Hence, the computational need of the feedback contribution is removed. Consequently the computational effort is drastically reduced without a notable chance in quality. This allows a full integration of the detection mechanism. The system is prototyped on a Xilinx Virtex II Pro P30 FPGA.

  14. Reproducibility of dorsal hand vein responses to phenylephrine and prostaglandin F2 alpha using the dorsal hand vein compliance method.

    Science.gov (United States)

    Schindler, C; Grossmann, M; Dobrev, D; Francke, K; Ravens, U; Kirch, W

    2003-03-01

    Assessment of drug-induced venodilation by the dorsal hand vein compliance method requires stable constriction of the vein. This study was designed to investigate intra- and intersubject reproducibility of the venous preconstriction technique in response to phenylephrine and prostaglandin F2 alpha and to determine the influence of basal vein size. Twelve healthy male nonsmokers participated in a prospective cross-over study. Inter- and intrasubject variability was tested in response to phenylephrine and PGF2 alpha on different study days in the same hand vein. The dose of the respective constrictor causing approximately 80% constriction of the vein (ED80) was determined and infused for another 100 minutes. Actual vein size was measured every 5 minutes. Coefficient of variation and regression analyses were performed to analyze influence of vessel size on ED80 of the respective constrictor. Adjusted constriction levels were stable and well reproducible in all subjects. The intersubject coefficient of variation of ED80 ranged from 0.9% to 6.7% for phenylephrine and from 0.9% to 6.9% for PGF2 alpha. Whereas responses to phenylephrine were independent of basal vein diameter, there was a positive correlation between ED80 of PGF2 alpha and basal vein size. Thus, the hand vein compliance method is a suitable method to study dilatory responses in phenylephrine- or PGF2 alpha-constricted veins with considerable interindividual but small intraindividual variability. However, in such studies, phenylephrine appears to be a more reliable tool than PGF2 alpha.

  15. A Dorsal Hand Vein Recognition-based on Local Gabor Phase Quantization with Whitening Transformation

    Directory of Open Access Journals (Sweden)

    K. Premalatha

    2014-03-01

    Full Text Available The hand vein pattern is a biometric feature in which the actual pattern is the shape of the vein network and its characteristics are the vein features. This paper investigates a new approach for dorsal hand vein pattern identification from grey level dorsal hand vein information. In this study Gabor filter quadrature pair is employed to compute locally in a window for every pixel position to extract the phase information. The phases of six frequency coefficients are quantized and it is used to form a descriptor code for the local region. These local descriptors are decorrelated using whitening transformation and a histogram is generated for every pixel which describes the local pattern.  Experiments are evaluated on North China University of Technology  dorsal hand vein image dataset with minimum distance classifier and the results are analyzed for recognition rate, run time and equal error rate. The proposed method gives 100 per cent recognition rate and 1 per cent EER for fusion of both left and right hands.Defence Science Journal, 2014, 64(2, pp. 159-167. DOI: http://dx.doi.org/10.14429/dsj.64.4659

  16. Personal authentication using hand vein triangulation and knuckle shape.

    Science.gov (United States)

    Kumar, Ajay; Prathyusha, K Venkata

    2009-09-01

    This paper presents a new approach to authenticate individuals using triangulation of hand vein images and simultaneous extraction of knuckle shape information. The proposed method is fully automated and employs palm dorsal hand vein images acquired from the low-cost, near infrared, contactless imaging. The knuckle tips are used as key points for the image normalization and extraction of region of interest. The matching scores are generated in two parallel stages: (i) hierarchical matching score from the four topologies of triangulation in the binarized vein structures and (ii) from the geometrical features consisting of knuckle point perimeter distances in the acquired images. The weighted score level combination from these two matching scores are used to authenticate the individuals. The achieved experimental results from the proposed system using contactless palm dorsal-hand vein images are promising (equal error rate of 1.14%) and suggest more user friendly alternative for user identification.

  17. Finger Vein Recognition Using Local Line Binary Pattern

    Directory of Open Access Journals (Sweden)

    Bakhtiar Affendi Rosdi

    2011-11-01

    Full Text Available In this paper, a personal verification method using finger vein is presented. Finger vein can be considered more secured compared to other hands based biometric traits such as fingerprint and palm print because the features are inside the human body. In the proposed method, a new texture descriptor called local line binary pattern (LLBP is utilized as feature extraction technique. The neighbourhood shape in LLBP is a straight line, unlike in local binary pattern (LBP which is a square shape. Experimental results show that the proposed method using LLBP has better performance than the previous methods using LBP and local derivative pattern (LDP.

  18. Hand Vein Recognition Based on Improved Template Matching

    Directory of Open Access Journals (Sweden)

    Jun Wang

    2014-12-01

    Full Text Available An improved template-construction method for hand vein recognition is presented. The accomplishment of the new algorithm involves several steps. First, we design the power-controlled multispectral vein acquisition handset to establish high-quality hand vein database. Second, we propose an improved valley-shaped enhancement operator with NiBlack algorithm to realize vein segmentation. Third, we get a basic-shaped template after dilation and erosion operation in the four neighborhoods firstly, and then we can get the final matching template combining all the shapes after the process of filling the connected region whose threshold is smaller than the one we set according to the experiment effect. Finally we design the hand vein recognition experiments using the designed template and traditional template respectively. The recognition rate of the improved template is 96.6% under the 1:1 mode and 95.75% under the 1:N mode while the recognition rate of the traditional template is 89.2 under the 1:1 mode and 88.2 under the 1:N mode.

  19. Fusion of hand vein, iris and fingerprint for person identity verification based on Bayesian theory

    Science.gov (United States)

    Li, Xiuyan; Liu, Tiegen; Deng, Shichao; Wang, Yunxin

    2009-11-01

    Biometric identification is an important guarantee for social security. In recent years, as the development of social and economic, the more accuracy and safety of identification are required. The person identity verification systems that use a single biometric appear inherent limitations in accuracy, user acceptance, universality. Limitations of unimodal biometric systems can be overcome by using multimodal biometric systems, which combines the conclusions made by a number of unrelated biometrics indicators. Aiming at the limitations of unimodal biometric identification, a recognition algorithm for multimodal biometric fusion based on hand vein, iris and fingerprint was proposed. To verify person identity, the hand vein images, iris images and fingerprint images were preprocessed firstly. The region of interest (ROI) of hand vein image was obtained and filtered to reduce image noises. The multiresolution analysis theory was utilized to extract the texture information of hand vein. The iris image was preprocessed through iris localization, eyelid detection, image normalization and image enhancement, and then the feature code of iris was extracted from the detail images obtained using wavelet transform. The texture feature information represented fingerprint pattern was extracted after filtering and image enhancement. The Bayesian theorem was employed to realize the fusion at the matching score level and the fusion recognition result was finally obtained. The experimental results were presented, which showed that the recognition performance of the proposed fusion method was obviously higher than that of single biometric recognition algorithm. It had verified the efficiency of the proposed method for biometrics.

  20. Infrared image acquisition system for vein pattern analysis

    Science.gov (United States)

    Castro-Ortega, R.; Toxqui-Quitl, C.; Padilla-Vivanco, A.; Solís-Villarreal, J.

    2016-09-01

    The physical shape of the hand vascular distribution contains useful information that can be used for identifying and authenticating purposes; which provide a high level of security as a biometric. Furthermore, this pattern can be used widely in health field such as venography and venipuncture. In this paper, we analyze different IR imaging systems in order to obtain high visibility images of the hand vein pattern. The images are acquired in the range of 400 nm to 1300 nm, using infrared and thermal cameras. For the first image acquisition system, we use a CCD camera and a light source with peak emission in the 880 nm obtaining the images by reflection. A second system consists only of a ThermaCAM P65 camera acquiring the naturally emanating infrared light from the hand. A method of digital image analysis is implemented using Contrast Limited Adaptive Histogram Equalization (CLAHE) to remove noise. Subsequently, adaptive thresholding and mathematical morphology operations are implemented to get the vein pattern distribution.

  1. A hand vein recognition system based on DSP and CPLD

    Institute of Scientific and Technical Information of China (English)

    KANG Wen-xiong; CHEN Zi-yi; YANG Qing-qiang

    2010-01-01

    @@ The hand vein recognition system based on digital signal processing(DSP)and complex programmable logic device (CPLD)is designed according to the requirements for equipment volume,accuracy and reaction speed.The overall structure and detailed implementation of the system hardware architecture are discussed in this paper.Moreover,the design philosophy and specific realization of system software as well as core algorithms are explored.The recognition system owns many good characteristics,such as high-degree integration,simple structure,flexible programming,convenient application and so on,which make it suitable for circumstances with high requirements for personal identification.

  2. Proximal lower limb vein thrombosis following vipera berus hand bite.

    Science.gov (United States)

    Gary, T; Prüller, F; Froehlich, H; Werner, S; Hafner, F; Brodmann, M

    2010-05-01

    Vipera berus has a wide geographical distribution throughout Central and Northern Europe. The symptoms after a bite usually are mild, life threatening symptoms are mainly described in children. We describe a case of popliteal vein thrombosis of the right leg after systemic envenoming with Vipera berus venom after a bite in the right hand by a female Vipera berus in the alpine region of Styria, Austria. Changes of the plasmatic coagulation system were obvious in our patient. These changes were due to an activation of the coagulation system and might be the reason for the thrombotic event in this usually healthy young male person.

  3. [Research on optimization of imaging system of the hand vein optical properties].

    Science.gov (United States)

    Lan, Huiying; Shi, Yan; Wang, Longwu

    2013-10-01

    Due to the difficulties of the copying, vein identification has developed rapidly in recent years. The light source selection directly affects the image quality. This paper acquired by experiment the reflectivities of vein and non-vein irradiation with different wavelengths of near infra-red. Comparing the strength of reflectivities of various wave lengths, we found that there were the strongest contrasts between vein and non-vein in the 810 nm, and 810 nm near infra-red was suitable to a vein imaging light source. Finally, clear hand vein images were obtained with the selected light source.

  4. Research of the types of applicable people and the statistical characteristics of hand vein image

    Science.gov (United States)

    Yang, Haifeng; Yang, Xiaoping; Xu, Wuchao; Yao, Shuyu; Wei, Chongchong; Qu, Huinan; Qu, Bingguang

    2014-11-01

    Hand vein image has been widely used in biological recognition, auxiliary medical and other fields. People with age, height, weight, gender differences have distinction in fat thickness of the back of hand, so the contrast and sharpness of their hand vein images are different too, which may affect the results of applications. In this paper, a hand vein image acquisition system is given and the hand vein images of people from the age of 3 to 60 are obtained in various conditions. The effect on the images caused by ages, genders, BMI (body mass index) and FMI (fat mass index) are researched and the statistical characteristics of the images are analyzed. The types of applicable people are also proposed for applications.

  5. Hand Vein Images Enhancement Based on Local Gray-level Information Histogram

    OpenAIRE

    Jun Wang; Guoqing Wang; Ming Li; Wenkai Du; Wenhui Yu

    2015-01-01

    Based on the Histogram equalization theory, this paper presents a novel concept of histogram to realize the contrast enhancement of hand vein images, avoiding the lost of topological vein structure or importing the fake vein information. Firstly, we propose the concept of gray-level information histogram, the fundamental characteristic of which is that the amplitudes of the components can objectively reflect the contribution of the gray levels and information to the representation of image in...

  6. Hand vein recognition based on the connection lines of reference point and feature point

    Science.gov (United States)

    Yun-peng, Hu; Zhi-yong, Wang; Xiao-ping, Yang; Yu-ming, Xue

    2014-01-01

    According to the essential characters of the image topology, a new hand vein recognition algorithm based on the connection lines of reference point and feature points is proposed. In this method, the intersection points and the endpoints of the vein image are used as feature points. After the intersection points and the endpoints selected as feature points, the reference point for image matching are extracted from these points. The relative distances between the reference point and the feature points and the angles between the adjacent connections of the reference point and feature points are calculated and used as recognition features. Finally these two features are combined for hand vein recognition. This method can effectively overcome the influence on the recognition results caused by image translation and rotation. Experimental results show that the proposed algorithm is able to achieve hand vein recognition reliably and quickly.

  7. Hand aperture patterns in prehension

    NARCIS (Netherlands)

    Bongers, Raoul M.; Zaal, Frank T. J. M.; Jeannerod, Marc

    2012-01-01

    Although variations in the standard prehensile pattern can be found in the literature, these alternative patterns have never been studied systematically. This was the goal of the current paper. Ten participants picked up objects with a pincer grip. Objects (3, 5, or 7 cm in diameter) were placed at

  8. Hand Gangrene Following Unsuccessful Cannulation of the Internal Jugular Vein: a Case Report and Literature Review

    OpenAIRE

    Roettges, Paul S.; Murray, Peter M.; Hill, David

    2009-01-01

    Hand gangrene following vascular cannula placement is uncommon and is usually the result of thrombotic occlusion of an artery. We describe a case of hand gangrene resulting in wrist disarticulation, following multiple unsuccessful attempts at internal jugular vein cannulation in a critically ill patient.

  9. Peripheral Intravenous Catheterisation in Obstetric Patients in the Hand or Forearm Vein: A Randomised Trial.

    Science.gov (United States)

    Tan, Peng Chiong; Mackeen, Anjana; Khong, Su Yen; Omar, Siti Zawiah; Noor Azmi, M A

    2016-03-18

    A peripheral intravenous catheter is often inserted as part of care during labour. The catheter is inserted into the back of the hand or lower forearm vein in usual practice. There is no trial data to guide the care provider on which is the better insertion site in any clinical setting. 307 women admitted to the labour ward who required insertion of intravenous catheter were randomised to back of hand or lower forearm vein catheter insertion. Catheter insertion is by junior to mid-grade providers. We evaluated insertion success at the first attempt, pain during insertion and catheter replacement due to malfunction as main outcomes. After catheter removal, we recorded patient satisfaction with site, future site preference and insertion site swelling, bruising, tenderness, vein thrombosis and pain. Insertion of a catheter into back of hand vein is more likely to be successful at the first attempt. Insertion pain score, catheter replacement rate, patient satisfaction, patient fidelity to site in a future insertion and insertion site complications rate are not different between trial arms. In conclusion, both insertion sites are suitable; the back of the hand vein maybe easier to cannulate and seems to be preferred by our frontline providers.

  10. 手静脉身份识别技术%Hand Vein Identification Technique

    Institute of Scientific and Technical Information of China (English)

    秦斌

    2011-01-01

    介绍了手静脉特征识别技术的发展历程和关键性事件,对手静脉识别技术的基本原理、静脉图像采集装置的结构和常用术语进行了解释.通过对手静脉特征识别技术的现状和使用中存在问题的研究,给出了手静脉特征识别技术未来研究的发展方向:研制新型的传感器;反欺骗技术的研究;标准化.%As a rapidly developing biometrics technology, hand vein recognition has significant advantages: socially acceptable, difficult to be copied, less subject to damage than fingerprints, non-invasive, without obvious health risks, unique identifier, low-cost, accurate and fast, less variable than behavioural biometrics such as signature and voice.Hand vein recognition has broad application prospects.The development process and key events of hand vein recognition technology are introduced.The basic principles, the structure and common terminologies of vein image acquisition device are explained.Through studying the research status and the problems still existed during experience, the future research directions for the development of hand vein recognition technology are summarized as: 1) new sensor technology research; 2) anti-cheat technology research; 3) standardization.

  11. Hand-Dorsa Vein Recognition by Matching Local Features of Multisource Keypoints.

    Science.gov (United States)

    Huang, Di; Tang, Yinhang; Wang, Yiding; Chen, Liming; Wang, Yunhong

    2015-09-01

    As an emerging biometric for people identification, the dorsal hand vein has received increasing attention in recent years due to the properties of being universal, unique, permanent, and contactless, and especially its simplicity of liveness detection and difficulty of forging. However, the dorsal hand vein is usually captured by near-infrared (NIR) sensors and the resulting image is of low contrast and shows a very sparse subcutaneous vascular network. Therefore, it does not offer sufficient distinctiveness in recognition particularly in the presence of large population. This paper proposes a novel approach to hand-dorsa vein recognition through matching local features of multiple sources. In contrast to current studies only concentrating on the hand vein network, we also make use of person dependent optical characteristics of the skin and subcutaneous tissue revealed by NIR hand-dorsa images and encode geometrical attributes of their landscapes, e.g., ridges, valleys, etc., through different quantities, such as cornerness and blobness, closely related to differential geometry. Specifically, the proposed method adopts an effective keypoint detection strategy to localize features on dorsal hand images, where the speciality of absorption and scattering of the entire dorsal hand is modeled as a combination of multiple (first-, second-, and third-) order gradients. These features comprehensively describe the discriminative clues of each dorsal hand. This method further robustly associates the corresponding keypoints between gallery and probe samples, and finally predicts the identity. Evaluated by extensive experiments, the proposed method achieves the best performance so far known on the North China University of Technology (NCUT) Part A dataset, showing its effectiveness. Additional results on NCUT Part B illustrate its generalization ability and robustness to low quality data.

  12. Associations between flow in paratibial perforating veins and great saphenous vein patterns of reflux

    Directory of Open Access Journals (Sweden)

    Carlos Alberto Engelhorn

    2015-06-01

    Full Text Available Perforating veins contribute to chronic venous valvular insufficiency (CVVI, subset of CVI of lower extremities (LE. We investigated the role of medial, proximal calf paratibial perforating veins (PTPV. Women with PTPV reflux, diameter ≥3 mm, or tortuosity were selected among 2199 LE mappings. Duplex ultrasonography (US was performed standing. Reflux >0.5 s was abnormal. PTPV conditions were related to great saphenous vein (GSV patterns of reflux. US of 442 LE of 379 women were analyzed, all being Clinical-Etiology-Anatomy-Pathophysiology (CEAP classification C1, C2, and/or having intermittent, conditional swelling. Etiology was primary. Pathophysiology was reflux, not thrombosis or obstruction. Most PTPV drained (n=281, 64% of 442 or 13% of 2199, or were source (n=73, 17%/442, 3%/2199 of GSV reflux; 49 (11%/442, 2%/2199 had reflux not associated with GSV; 39 (9%/442, 2%/2199 did not have reflux. PTPV, when significative for CVVI, primarily drained-GSV reflux. PTPV was linked to reflux in 1 of 5 and was a major source of reflux in 1 of 20 legs. Detailed US of PTPV insured over 80% accuracy in CVVI mapping.

  13. Left Hand-assisted Laparoscopic Nephrectomy With Renal Vein Thrombectomy for Stage T3b Renal Cell Carcinoma.

    Science.gov (United States)

    Ghareeb, George M; Kenleigh, Dorian A; Brown, James A

    2016-04-01

    A 60-year-old male was found to have an 8.0 cm left renal mass and associated renal vein thrombus on computed tomography. The thrombus extended 3 mm beyond the right aortic border to within 1.6 cm of the left border of the inferior vena cava. The patient underwent left nephrectomy with renal vein thrombectomy using a hand-assisted laparoscopic approach. The tumor thrombus was "milked" proximally back into left renal vein, which was then divided with an endovascular stapler. Left renal vein thrombi extending to right margin of the aorta can be managed with hand-assisted laparoscopic approach.

  14. Hand Vein Images Enhancement Based on Local Gray-level Information Histogram

    Directory of Open Access Journals (Sweden)

    Jun Wang

    2015-06-01

    Full Text Available Based on the Histogram equalization theory, this paper presents a novel concept of histogram to realize the contrast enhancement of hand vein images, avoiding the lost of topological vein structure or importing the fake vein information. Firstly, we propose the concept of gray-level information histogram, the fundamental characteristic of which is that the amplitudes of the components can objectively reflect the contribution of the gray levels and information to the representation of image information. Then, we propose the histogram equalization method that is composed of an automatic histogram separation module and an intensity transformation module, and the histogram separation module is a combination of the proposed prompt multiple threshold procedure and an optimum peak signal-to-noise (PSNR calculation to separate the histogram into small-scale detail, the use of the intensity transformation module can enhance the vein images with vein topological structure and gray information preservation for each generated sub-histogram. Experimental results show that the proposed method can achieve extremely good contrast enhancement effect.

  15. A method of recognition based on the feature layer fusion of palmprint and hand vein

    Science.gov (United States)

    Ma, Hua; Yang, Xiaoping; Shi, Guangyuan

    2013-12-01

    In this paper, a method of recognition of multi-modal biometrics for palmprint and hand vein based on the feature layer fusion is proposed, combined with the characteristics of an improved canonical correlation analysis (CCA) and two dimensional principal component analysis (2DPCA). After pretreatment respectively, feature vectors of palmprint and hand vein images are extracted using two dimensional principal component analysis (2DPCA),then fused in the feature level using the improved canonical correlation analysis(CCA), so identification can be done by a adjacent classifier finally. Using this method, two biometric information can be fused and the redundancy of information between features can effectively eliminated, the problem of the high-dimensional and small sample size can be overcome too. Simulation experimental results show that the proposed method in this paper can effectively improve the recognition rate of identification.

  16. Clinical results and thoughts on sensory nerve repair by autologous vein graft in emergency hand reconstruction.

    Science.gov (United States)

    Risitano, G; Cavallaro, G; Merrino, T; Coppolino, S; Ruggeri, F

    2002-05-01

    Lesions of the digital and other sensory nerves in the hand are common. Based on experimental studies on vein graft as a support for peripheral nerve regeneration, the Authors have been using a simple vein graft to bridge sensory nerve gaps when treating acute hand injuries. This is a retrospective study on the results of 22 sensory nerves repaired using vein grafts in cases in which primary suture was not feasible, in emergency hand reconstruction. Patients were informed that a secondary nerve graft could possibly be necessary in the future. Patients were reviewed by two independent observers at least one year after repair and evaluated using the Highest scale as modified by MacKinnon & Dellon. Evaluation chart included influence of repair on rehabilitation program and presence of painful neuromas and scars as well as patient satisfaction. Results were classified according to Sakellarides and 20/22 were classified as very good or good. Cases classified as poor were satisfied and no secondary nerve grafting has been carried out. Rehabilitation of the associated lesions (tendon lacerations or bone and soft tissue damage) was not influenced by the nerve repair and no painful neuroma was reported in the series. In conclusion, since the literature shows unsatisfactory results in repair of digital nerves with nerve grafts, since it's been demonstrated that an unrepaired sensory nerve leads to painful scar and painful neuroma and since we are reluctant to use nerve grafts in emergency procedures, we recommend this simple method because it is easy, low-cost and effective.

  17. Dorsal hand vein recognition based on Gabor multi-orientation fusion and multi-scale HOG features

    Science.gov (United States)

    Han, Tuo; Wang, Zhiyong; Yang, Xiaoping

    2016-10-01

    Kinds of factors such as illumination and hand gestures would reduce the accuracy of dorsal hand vein recognition. Aiming at single hand vein image with low contrast and simple structure, an algorithm combining Gabor multi-orientation features fusion with Multi-scale Histogram of Oriented Gradient (MS-HOG) is proposed in this paper. With this method, more features will be extracted to improve the recognition accuracy. Firstly, diagrams of multi-scale and multi-orientation are acquired using Gabor transformation, then the Gabor features of the same scale and multi-orientation will be fused, and the features of the correspondent fusion diagrams will be extracted with a HOG operator of a certain scale. Finally the multi-scale cascaded histograms will be obtained for hand vein recognition. The experimental results show that our method not only improve the recognition accuracy but has good robustness in dorsal hand vein recognition.

  18. THE SIGNIFICANCE OF PATTERN ERG IN CENTRAL VEIN OCCLUSION

    Directory of Open Access Journals (Sweden)

    Saša Novak

    2004-12-01

    Full Text Available Pattern electroretinogram (PERG findings were analysed in 30 patients with central retinal vein occlusion. Latency and amplitude values of PERG waves were compared with the results obtained in 30 healthy individuals after sample randomisation. In 15 cases with „hemorrhagic type” occlusion of the central retinal vein significantly reduced N1-P1 wave amplitude was noted (0,369 mV, related to „exudative“ disease type (0,557 mV, as well as to the control group of examines (0,782 mV. PERG was described as the sensitive method and important indicator in damage assessment, ie. ischemia in the ganglional cell layer in central retinal vein occlusion. Ischemia increases anoxia, which influences not only the axons but also the enzymatic and transport processes within the cell bodies, dendrites, axons and axonal terminals. Slowing down of the fast phase of axoplasmatic transport in the axons in ischemic damage blocked transmission impulses which could be evident through different degrees of PERG wave amplitude reduction. With this method the patients can be selected in whom due to severe retinal ischemia there is the risk of neovascular glaucomma and maculopathy, which is the absolute indication for panlaser-photocoagulation.

  19. An Efficient Vein Pattern-based Recognition System

    CERN Document Server

    Soni, Mohit; Rao, M S; Gupta, Phalguni

    2010-01-01

    This paper presents an efficient human recognition system based on vein pattern from the palma dorsa. A new absorption based technique has been proposed to collect good quality images with the help of a low cost camera and light source. The system automatically detects the region of interest from the image and does the necessary preprocessing to extract features. A Euclidean Distance based matching technique has been used for making the decision. It has been tested on a data set of 1750 image samples collected from 341 individuals. The accuracy of the verification system is found to be 99.26% with false rejection rate (FRR) of 0.03%.

  20. Persistence of left supracardinal vein in an adult patient with heart-hand syndrome and cardiac pacemaker.

    Science.gov (United States)

    Nemec, Jan; Heifetz, Steven

    2008-01-01

    A patient with a sporadic heart-hand syndrome, which includes thumb hypoplasia, septum primum atrial septal defect, and cleft mitral valve is described. During attempted placement of a pacemaker lead, persistence of left superior and inferior vena cava was found in addition to the right-sided caval veins. This corresponds to persistence of left-sided supracardinal vein present during fetal development.

  1. Clipless management of the renal vein during hand-assist laparoscopic donor nephrectomy

    Directory of Open Access Journals (Sweden)

    Rosenblatt Gregory S

    2006-09-01

    Full Text Available Abstract Background Laparoscopic live donor nephrectomy has become the preferred method of donor nephrectomy at many transplant centers. The laparoscopic stapling device is commonly used for division of the renal vessels. Malfunction of the stapling device can occur, and is often due to interference from previously placed clips. We report our experience with a clipless technique in which no vascular clips are placed on tributaries of the renal vein at or near the renal hilum in order to avoid laparoscopic stapling device misfires. Methods From December 20, 2002 to April 12, 2005, 50 patients underwent hand-assisted laparoscopic left donor nephrectomy (LDN at our institution. Clipless management of the renal vein tributaries was used in all patients, and these vessels were divided using either a laparoscopic stapling device or the LigaSureTM device (Valleylab, Boulder, CO. The medical and operative records of the donors and recipients were reviewed to evaluate patient outcomes. Results The mean follow-up time was 14 months. Of the 50 LDN procedures, there were no laparoscopic stapling device malfunctions and no vascular complications. All renal allografts were functioning at the time of follow-up. Conclusion Laparoscopic stapling device failure due to deployment across previously placed surgical clips during laparoscopic live donor nephrectomy can be prevented by not placing clips on the tributaries of the renal vein. In our series, there were no vascular complications and no device misfires. We believe this clipless technique improves the safety of laparoscopic donor nephrectomy.

  2. Application of Ridgelet in Dorsal Hand Vein Recognition%脊波分析在手背静脉识别中的应用

    Institute of Scientific and Technical Information of China (English)

    韩笑; 徐坤; 马驷良

    2011-01-01

    提出一种基于改进的有限脊波变换的手背静脉识别算法.利用脊波理论适合于表示直线奇异性的特点,对手背静脉特征进行分析.使用改进的有限脊波变换对手背静脉图像进行分解,得到不同分解尺度下手背静脉的多分辨脊波特征,再通过定义多分辨脊波特征距离进行模式匹配.实验结果表明,与传统静脉特征提取方法相比,该方法较完整地保留了静脉的原始信息,提高了运行速度并降低了算法复杂度.%One method of dorsal hand vein recognition based on improved FRIT was proposed. Analyzing image line' s singularity, we can obtain the characteristics of the dorsal hand vein. That' s just the ability of ridgelet transform. The processing is that hand vein images are decomposed by improved FRIT firstly; then multi-scale ridgelet features (MRF) of vein image are obtained in different decomposition scales; finally,pattern matching was done by defining MRF distance. Compared with other vein recognition methods, our approach completely preserves original information of the vein. It not only increases the speed of system but also reduces the complexity of the algorithm.

  3. The influence of age on dorsal hand vein responsiveness to norepinephrine.

    Science.gov (United States)

    Martin, S A; Alexieva, S; Carruthers, S G

    1986-09-01

    The influence of age on the responsiveness of dorsal hand vein alpha-receptors to local infusions of norepinephrine was investigated by the use of a novel technique, the linear variable differential transformer. Studies were conducted in two groups of healthy subjects, 26 elderly individuals (14 men and 12 women) 60 to 78 years old and 32 young individuals (24 men and eight women) 16 to 29 years old. There was wide interindividual variation in responsiveness to norepinephrine within both groups of subjects. The dose of norepinephrine required to produce 50% venoconstriction in the elderly ranged from 1.5 to 300 ng/min (geometric mean 24.0 ng/min). The dose required to produce 50% venoconstriction in younger individuals ranged from 1.6 to 360 ng/min (geometric mean 23.8 ng/min). These results suggest that there is no systematic influence of age on dorsal hand vein alpha-receptor responsiveness. A power calculation demonstrates a very small likelihood of a type II error.

  4. Vasoconstricting effect of angiotensin II in human hand veins: influence of aging, diabetes mellitus and hypertension.

    Science.gov (United States)

    Harada, Kazuhiro; Ohmori, Masami; Fujimura, Akio

    2002-09-01

    We examined human hand veins to determine whether venoconstricting response to angiotensin II (Ang II) and noradrenaline (NA) was influenced by aging or such diseases as diabetes mellitus (DM) and hypertension (HT). Twenty healthy male subjects (20-73 years), and 8 male patients with non-insulin-dependent DM and 8 male patients with essential HT were included in this study. A constant dose (50 ng/min) of Ang II or increasing dose (2-256 ng/min) of NA was infused into the dorsal hand vein and its diameter was measured using a linear variable differential transformer. The constant infusion of Ang II caused rapid desensitization or tachyphylaxis. The venoconstriction by Ang II in the 8 elderly subjects (58 to 73 years) was significantly (p<0.05) larger than that in the 8 young subjects (20 to 36 years) from 6 to 18 min after the start of the infusion (after 6 min: 63.6+/-11.6 (mean+/-SD)% vs. 39.9+/-20.8%, 12 min: 34.0+/-11.9% vs. 12.0+/-12.0%). However, the venoconstriction by Ang II in the patients with DM or HT was not significantly different from that in the 9 age-matched control subjects. No significant difference in venoconstrictor response to NA was observed between the young and elderly subjects, nor between the control subjects and the patients with DM or HT. These findings indicated that venoconstrictor response to Ang II might be greater in the elderly but might not be influenced by DM nor HT.

  5. A study of dorsal vein pattern for biometric security

    African Journals Online (AJOL)

    Nafiisah

    A biometric system can function in any of these two modes; verification mode or ..... Then the Gaussian blur filter is applied to filter noise. ... edge weighted diffusion was applied to smoothen the image while preserving the vein edges. [3].

  6. LOCALIZATION OF PALM DORSAL VEIN PATTERN USING IMAGE PROCESSING FOR AUTOMATED INTRA-VENOUS DRUG NEEDLE INSERTION

    OpenAIRE

    Mrs. Kavitha. R,; Tripty Singh

    2011-01-01

    Vein pattern in palms is a random mesh of interconnected and inter- wining blood vessels. This project is the application of vein detection concept to automate the drug delivery process. It dealswith extracting palm dorsal vein structures, which is a key procedure for selecting the optimal drug needle insertion point. Gray scale images obtained from a low cost IR-webcam are poor in contrast, and usually noisy which make an effective vein segmentation a great challenge. Here a new vein image s...

  7. A ROI Extraction Algorithm for Dorsal Hand Vein Image%手背静脉图像 ROI 提取算法研究

    Institute of Scientific and Technical Information of China (English)

    潘晓苹; 汪天富

    2013-01-01

    Dorsal hand vein pattern recognition is a new biometric identification technology, with the virtue of living body rec-ognition , inner characteristic, and non-contact. The most emphases and critical task is to extract the region of interest(ROI) of hand vein images. A new algorithm combined with Canny operator and Freeman chain code is proposed to locate the ROIs of hand vein images. The experimental results show that the ROI is accurately located, not only can get rid of hand-shape affection, but also can keep robust.%  手背静脉识别是新兴的身份认证技术,与指纹识别相比,具有活体识别、内部特征、非接触式等优点,其关键点之一是对静脉图像感兴趣区域精准定位。文章提出了结合 Canny 边缘检测算法和 Freeman 链码的手背静脉感兴趣区域定位算法。实验结果表明,该算法能够克服手形姿势变化的影响进行准确定位,具有良好的鲁棒性,对手背静脉身份特征识别技术研究具有参考价值。

  8. A modified DRIL procedure by flow reversal of an aborted distal cephalic vein for critical hand ischaemia.

    Science.gov (United States)

    Danzer, D; Czerny, M; Widmer, M K

    2011-09-01

    Treatment of dialysis access-related hand ischaemia with preservation of the access remains an issue. We report the case of a patient presenting critical hand ischaemia 2 years after proximalisation of a distal radio-cephalic fistula with preservation of the original access. After valvulotomy, the distal cephalic vein was used as in situ bypass and directly anastomosed to the distal brachial artery, providing a direct flow to the hand. This procedure relieved the hand ischaemia without sacrificing the functioning fistula. Six months later, the fistula and bypass were still patent, showing that flow reversal of a previous fistula can be an efficient strategy to correct dialysis access-related hand ischaemia in selected cases.

  9. Registration of hand-grip pattern in smart gun

    NARCIS (Netherlands)

    Shang, X.; Veldhuis, R.N.J.

    2006-01-01

    Secure Grip1 focuses on the development of a hand-grip pattern recognition system, as part of a smart gun. It is intended for use by the police. We collected the hand-grip data from police officers in three sessions in a row with time intervals in between. If data for training and testing come from

  10. Chronic venous insufficiency patterns in lower extremity veins detected by Doppler Ultrasound

    Directory of Open Access Journals (Sweden)

    Özhan Özgür

    2013-12-01

    Full Text Available Objective: The aim of this study was to reveal patterns ofchronic venous insufficiency of lower extremity detectedby color Doppler ultrasound and clarify its clinical implicationsin the patients with varicose veins symptoms.Methods: Between 2006 to 2011, a total of 2006 patientspresented with symptoms of venous insufficiency wereincluded in study. A total of 3938 lower extremity venoussystems were examined using color Doppler US. Weclassified four patterns considering combinations of superficialand deep venous insufficiency.Results: Of 2006 patients, 966 had either single venousinsufficiency (790, 82% or combined insufficiency (176,18%. Superficial venous insufficiency was observedat the saphenoefemoral junction (SFJ in 25.5%, at theGreat Saphenous Vein (GSV in 57.6%, at the GiacominiVein in 2.4%, at the saphenopopliteal junction in 1.8% andfinally at the Small Saphenous Vein (SSV in 9.1% of thepatients. We found multilevel venous insufficiency showingconnections at the rate of 51%. We described fourpatterns as Pattern 1: SFJ insufficiency combined withGSV (97.9%, GSV branching (7.1%, and perforatingvein (20.8% insufficiency, Pattern 2: Deep venous insufficiencycombined with SFJ (63.6%, GSV (76.4%, andSSV (16.4% insufficiency, Pattern 3: SPJ insufficiencycombined with SSV insufficiency (95.5% and Pattern 4:Giacomini Vein insufficiency combined with GSV (67.9%and SSV (75% insufficiency.Conclusion: Chronic venous insufficiency may show fourdifferent patterns. Our results revealed that SFJ and GSVinsufficiency combination and deep venous insufficiencyand GSV insufficiency combinations are the most commoninsufficiency patterns seen in lower extremity.Key words: Doppler ultrasound, varicose veins, venous insufficiency

  11. Characterization of local vascular effects of the nitric oxide inhibitor NG-monomethyl-L-arginine on dorsal hand veins.

    Science.gov (United States)

    Schindler, Christoph; Leuschner, Sven; Schwanebeck, Uta; Kirch, Wilhelm

    2012-06-01

    Infusion of NG-monomethyl-L-arginine (L-NMMA; 6.4 µmol/min) into hand veins can cause a 20% increase in vein size in specific subjects. This study explored potential underlying mechanisms in healthy male participants. Ten healthy male participants received in phenylephrine (PE)-preconstricted veins a dose-response curve (DRC) to L-NMMA (0.2-6.4 µmol/min) without and with coinfusion of the endothelium-dependent dilator histamine, a DRC to L-arginine with and without coinfusion of L-NMMA, a DRC to NG-monomethyl-D-arginine (D-NMMA), and a DRC to L-NMMA in prostaglandin F(2α)-(PGF(2α))-preconstricted veins. Participants were classified as L-NMMA responders (R) and nonresponders (NR). Infusion of L-NMMA resulted in a maximum venodilation of 38% ± 11% (R) versus 10% ± 5% (NR; P = .005). In PGF(2α)-preconstricted veins, L-NMMA caused venodilation to 26% ± 34% (NS) in responders. Results suggest that endothelial nitric oxide synthase-mediated formation of nitric oxide (NO) from L-NMMA in doses >3.2 µmol/min and continuous PE-induced α-adrenergic stimulation resulting in release of very small amounts of NO from L-NMMA contribute to the observed L-NMMA-induced increase in vein size. Venous reactivity to L-NMMA resulting in a phenotype as R or NR is most likely genetically predetermined, which requires further study.

  12. Gender-related Changes in Dorsal Hand and Foot Vein Function Following 60 Days of Head Down Bed Rest

    Science.gov (United States)

    Westby, Christian M.; Phillips, Tiffany; Stenger, Michael B.; Platts, Steven H.

    2009-01-01

    It is well known that female astronauts are more likely to experience post-flight orthostatic hypotension and presyncope compared to male astronauts. It has been suggested that the disproportionally higher incidence of presyncope (83% of female vs. 20% male crewmembers) may be due to sex-related differences in vascular function between the upper and lower limbs. However, much of this evidence is specific to changes in resistance vessels. Given that more than 70% of the circulating blood volume resides in compliance vessels, it is conceivable that even small changes in venous function may contribute to post-flight orthostatic hypotension. In spite of this, little is currently known regarding the influence of microgravity exposure on venous function between males and females. PURPOSE: To determine the influence of 60 days of HDBR on dorsal foot and hand vein function between healthy males (M) and females (F). METHODS: Using 2-D ultrasound, dorsal hand and foot vein diameter responses to intravenous infusions phenylephrine (PE), acetylcholine (ACh), and nitroglycerine (NTG) were determined in 26 adults; 10 females (age:37 +/- 2 yr ) and 16 males (age:34 +/- 2 yr ). Changes in venous function were calculated as the difference between diameter at baseline and following each venoactive drug. Differences in venous function between limb and sexes across HDBR were determined using mixed-effects linear regression. RESULTS: In response to 60 days of HDBR, the change in venousconstrictor response to PE in the dorsal hand veins was not significantly different between M and F. Interestingly, the change in constrictor response in the dorsal foot veins (compared to pre HDBR) was approximately 30% greater in the F, whereas the constrictor response was approximately 45% less in the M (p=0.026). HDBR had no influence on the change in dilator response to ACh, or NTG between M and F and between vascular beds. CONCLUSION: These results demonstrate that 60 days of HDBR contributes to sex

  13. 基于域Morphing算法的手背静脉识别%Hand Vein Recognition Based on Domain Morphing Algorithm

    Institute of Scientific and Technical Information of China (English)

    韩笑; 赵政达; 王天明

    2013-01-01

    According to the human hand vein image structure and its features, the authors proposed a fast algorithm of domain Morphing on dorsal hand vein image. Then, we calculated the similarity of images to achieve vein recognition.%根据人体手背静脉图像的结构及特点,提出一种快速域Morphing算法对手背静脉图像进行变换,通过对图像进行相似度计算实现了静脉识别.

  14. Influence of systemically given placebo, trapidil and isosorbide dinitrate on norepinephrine-evoked hand vein constriction in healthy subjects.

    Science.gov (United States)

    Sziegoleit, Werner; Dannenberg, Katrin; Konschak, Ariana; Lautenschläger, Christine; Presek, Peter

    2007-01-01

    Since trapidil (CAS 15421-84-8) is able to dilate human hand veins after local intravenous administration, four studies were carried out in healthy male volunteers using the dorsal hand vein compliance technique to test the influence of common systemic single doses of trapidil (200 mg orally, 100 mg intravenously) and isosorbide dinitrate (CAS 87-33-2, 20 mg orally) on norepinephrine (CAS 51-41-2)-evoked hand vein constriction in comparison with oral placebo. Oral placebo and oral trapidil were studied in a randomized double-blind cross-over design in 10 subjects aged 20 to 30 years, and oral isosorbide dinitrate and intravenous trapidil, in a randomized open cross-over design in 8 subjects aged 22 to 29 years. In the three similar studies with oral medications dose-response curves for venoconstriction by locally infused norepinephrine were established before and 1 h, 2 h and 3 h after oral medication and ED50 values of norepinephrine were calculated. The control dose-response curves and ED50 values of norepinephrine did not differ significantly. After oral placebo administration the dose-response curves of norepinephrine did not change significantly, but the ED50 of norepinephrine increased 3 h after placebo (from 12.1 to 31.7 ng/ min), indicating a lessening in norepinephrine effect at this time. After oral trapidil application the dose-response curves of norepinephrine shifted to the left compared with the pre-treatment curve (significantly 2 h after trapidil) and the corresponding curves after placebo with a significant decrease in the ED50 of norepinephrine 3 h after trapidil compared with placebo (from 31.7 to 12.6 ng/ min). After oral isosorbide dinitrate administration the dose-response curves of norepinephrine did not differ significantly from the pre-treatment curve, but they shifted to the left compared with the corresponding curves after placebo (significantly 3 h after isosorbide dinitrate). The ED50 of norephinephrine decreased significantly 2 h after

  15. Grasping Pattern Recognition and Grasping Force Estimation For Prosthetic Hands

    Directory of Open Access Journals (Sweden)

    Zhang Bing-Ke

    2016-01-01

    Full Text Available Human’s movement can be decoded by surface electromyography (EMG, and the prosthetic hand can be controlled freely through EMG signal. This paper proposes a grasping pattern and force synchronized decoding method for prosthetic hands. Considering pattern recognition and force estimation simultaneously, this paper analyzes whether different muscle contraction levels affect pattern recognition and whether different grasping modes have impact on force estimation, then proposes two schemes to complete EMG simultaneously decoding. Experiments compare the accuracy of the two methods. The results show that there is no much difference between two methods in force estimation, the former’s accuracy of pattern recognition is a little higher than the latter.

  16. 手背静脉图像增强和分割方法%Novel Algorithm For Hand Vein Image Enhancement and Segmentation

    Institute of Scientific and Technical Information of China (English)

    胡学友

    2014-01-01

    近红外摄像机采集到的手背静脉图像对比度较低且静脉结构简单,为了有效提取手背静脉结构特征,首先分割出包含主要静脉结构信息的区域,并进行灰度归一化;然后利用动态全局阈值法对静脉结构进行粗分割;最后根据静脉的几何结构特征,去除虚假静脉,获得真实的手背静脉图像;实验结果证明了算法的有效性。%The hand vein structure is simple and the contrast is low for the hand vein image captured by the near infrared camera. In order to effectively extract the hand vein structure feature, firstly, the AOI is segmented to reduce the influence of background and edge, and the gray values normalization is done ; secondly, dynamic global threshold method is used to roughly segment the vein structure; Finally, according to the structure characteristics of hand vein, the false vein is removed and get the read vein image;The experimental results show the efficiency for the algorithm proposed in this paper.

  17. Automatic Reading of Hand-painted Carpet Patterns

    Directory of Open Access Journals (Sweden)

    M. Fateh

    2012-09-01

    Full Text Available Carpet patterns are in two categories: machine-printed and hand-painted. There are a few articles on automatic reading of machine-printed patterns, but due to the difficulties in reading of machine-printed patterns, there is not any published work yet. This article provides a new method for automatic reading of hand-painted carpet patterns which consists of the following steps: initial pixel-based color reduction, knot-based color reduction, segmentation by region growing and final color reduction. The proposed method is tailored for the application in hand and, therefore yields a good result. For 80 segments of different patterns, the algorithm has an approximate of 95% accuracy. In other words, the color of 95% of pattern knots are found accurately. It is tried to develop a method with proper accuracy and speed. Therefore, the proposed method is not completely automatic and the number of colors is required to be given by the user.

  18. Cortical excitability differences in hand muscles follow a split-hand pattern in healthy controls.

    Science.gov (United States)

    Menon, Parvathi; Kiernan, Matthew C; Vucic, Steve

    2014-06-01

    Differences in cortical and axonal excitability may underlie preferential atrophy of abductor pollicis brevis (APB) and first dorsal interosseous (FDI) in amyotrophic lateral sclerosis, termed the split-hand. Consequently, this study aimed to determine whether differences in excitability follow a split-hand pattern across the intrinsic hand muscles. Excitability studies were undertaken using threshold tracking techniques in 26 healthy controls with responses recorded over APB, FDI, and abductor digiti minimi. Short interval intracortical inhibition was significantly greater from the APB and FDI. In addition, motor evoked potential amplitude was greater, while cortical silent period was longer from APB and FDI. At a peripheral level, the strength-duration time constant was greater when recorded over APB. This study establishes that differences in cortical excitability follow the split-hand pattern in healthy controls, a finding potentially explained by evolution of specialized activity of APB/FDI in complex hand tasks. Muscle Nerve 49: 836-844, 2014. Copyright © 2014 Wiley Periodicals, Inc.

  19. Gambler's fallacy, hot hand belief, and the time of patterns

    Directory of Open Access Journals (Sweden)

    Hongbin Wang

    2010-04-01

    Full Text Available The gambler's fallacy and the hot hand belief have been classified as two exemplars of human misperceptions of random sequential events. This article examines the times of pattern occurrences where a fair or biased coin is tossed repeatedly. We demonstrate that, due to different pattern composition, two different statistics (mean time and waiting time can arise from the same independent Bernoulli trials. When the coin is fair, the mean time is equal for all patterns of the same length but the waiting time is the longest for streak patterns. When the coin is biased, both mean time and waiting time change more rapidly with the probability of heads for a streak pattern than for a non-streak pattern. These facts might provide a new insight for understanding why people view streak patterns as rare and remarkable. The statistics of waiting time may not justify the prediction by the gambler's fallacy, but paying attention to streaks in the hot hand belief appears to be meaningful in detecting the changes in the underlying process.

  20. PATTERN OF POST BURN CONTRACTURE OF HAND IN EASTERN INDIA

    Directory of Open Access Journals (Sweden)

    Nishith M

    2016-05-01

    Full Text Available BACKGROUND Contracture of the hand poises great morbidity. Despite increasing sophistication in the overall management of acute thermal injuries, contractures still occur and are the most common cause of skin contracture in the hand. The problem of post burn contracture is largely preventable by good initial care. We studied 60 consecutive patients of post burn contracture of hand treated at Rajendra Institute of Medical Sciences, Ranchi, India with the aim to observe different patterns of post-traumatic contracture in hand and to assess the result of various treatment modalities. RESULTS Children and infants were most commonly involved with M:F ratio being 1.3:1. Flame burn was found to be the most common etiological factor. Right hand was involved in 53.33% of cases. Fingers were the most common anatomical site involving 90% of patients followed by wrist and palm. Only 23.33% patients were initially treated by a specialist while majorities i.e. 46.67% were initially treated by quacks or paramedical personnel. Z-Plasty was used as a method of reconstruction in 50% of cases and was the most common surgical intervention used followed by V-Y plasty in 20% cases. CONCLUSION Major causes of neglect in the treatment of post burns contracture were illiteracy. Reconstructive procedures can greatly improve the function of the hands. Appropriate choice of procedures and timely surgery is the key for treatment.

  1. Coronary veins determine the pattern of sympathetic innervation in the developing heart

    Science.gov (United States)

    Nam, Joseph; Onitsuka, Izumi; Hatch, John; Uchida, Yutaka; Ray, Saugata; Huang, Siyi; Li, Wenling; Zang, Heesuk; Ruiz-Lozano, Pilar; Mukouyama, Yoh-suke

    2013-01-01

    Anatomical congruence of peripheral nerves and blood vessels is well recognized in a variety of tissues. Their physical proximity and similar branching patterns suggest that the development of these networks might be a coordinated process. Here we show that large diameter coronary veins serve as an intermediate template for distal sympathetic axon extension in the subepicardial layer of the dorsal ventricular wall of the developing mouse heart. Vascular smooth muscle cells (VSMCs) associate with large diameter veins during angiogenesis. In vivo and in vitro experiments demonstrate that these cells mediate extension of sympathetic axons via nerve growth factor (NGF). This association enables topological targeting of axons to final targets such as large diameter coronary arteries in the deeper myocardial layer. As axons extend along veins, arterial VSMCs begin to secrete NGF, which allows axons to reach target cells. We propose a sequential mechanism in which initial axon extension in the subepicardium is governed by transient NGF expression by VSMCs as they are recruited to coronary veins; subsequently, VSMCs in the myocardium begin to express NGF as they are recruited by remodeling arteries, attracting axons toward their final targets. The proposed mechanism underlies a distinct, stereotypical pattern of autonomic innervation that is adapted to the complex tissue structure and physiology of the heart. PMID:23462468

  2. ASSOCIATION BETWEEN RETINAL HEMORRHAGIC PATTERNS AND PERFUSION STATUS IN EYES WITH ACUTE CENTRAL RETINAL VEIN OCCLUSION.

    Science.gov (United States)

    Muraoka, Yuki; Uji, Akihito; Tsujikawa, Akitaka; Murakami, Tomoaki; Ooto, Sotaro; Suzuma, Kiyoshi; Takahashi, Ayako; Iida, Yuto; Miwa, Yuko; Hata, Masayuki; Yoshimura, Nagahisa

    2017-03-01

    To evaluate peripheral retinal hemorrhagic patterns in eyes with acute central retinal vein occlusion, and to explore their clinical relevance in differentiating for the retinal perfusion status, through a prospective, and cross-sectional study. Fifty eyes with acute central retinal vein occlusion were included. Retinal hemorrhagic patterns at the equator and retinal perfusion status were evaluated by ultra-wide field fundus photography and fluorescein angiography. Retinal perfusion was categorized as nonischemic in 29 eyes, ischemic in 18 eyes, and undeterminable in 3 eyes. None of the examined eyes had flame-shaped retinal hemorrhages in the periphery. All hemorrhages were rounded-dot or blot and were variable in size. Particle analysis was performed to quantify hemorrhage size, and showed higher values in eyes having larger blot hemorrhages, and lower values in eyes having dot or smaller blot hemorrhages. Mean size of maximum peripheral dot or blot hemorrhage was larger in eyes classified as ischemic (10,763.0 ± 5,946.3 pixels) than as nonischemic (2,839.9 ± 1,153.6 pixels, P retinal perfusion status, which was 0.963 (P retinal hemorrhagic patterns at the equator in eyes with acute central retinal vein occlusion using particle analysis. The resulting hemorrhage size measurement was considered to be often useful in determining retinal perfusion status. Because they can be noninvasively evaluated with readily available equipment, peripheral hemorrhagic patterns might be good clinical markers of retinal perfusion.

  3. 低对比度手背静脉图像的增强和分割%Enhancement and Segmentation of Low Contrast Hand Dorsal Vein Image

    Institute of Scientific and Technical Information of China (English)

    朱丛虎; 王华彬; 陶亮

    2011-01-01

    The human hand dorsal vein recognition technology is a biometric technology. The human hand dorsal has much more veins than the fingers, and can be extracted more features for authentication, so the hand dorsal vein recognition as an authentication approach used in the field of information security has a very important practical significance. Due to the difference of the light intensity and the thickness of hand dorsal, the quality of the hand dorsal image is not very good. The hand dorsal vein images have lower contrast degrees. In order to acquire better contrast hand dorsal vein images, a hand dorsal vein processing method that combines the morphology method and the contrast limited local histogram equalization (CLAHE) is presented. Experiments indicate that the proposed method can strengthen the contrast degrees of the hand dorsal vein and background effectively, and has a significant effect on the segmentation of hand dorsal vein.%人体手背静脉识别技术是生物特征识别技术的一种.人的手背拥有比手指更为丰富的静脉血管,可以提取更多的并且适于身份认证的特征,所以把手背静脉识别作为一种身份认证方式,应用于信息安全等领域具有非常重要的现实意义.由于光照强度、手背厚度的不同,所采集到的手背静脉图像的质量不是很好,对比度比较低.为了得到有较好对比度的手背静脉图像,提出了一种基于形态学处理与对比度受限的局部直方图均衡(CIAHE)相结合的手背静脉图像处理的方法.实验表明,这种方法能有效地增强手背静脉和背景的对比度,使得静脉分割取得了很好的效果.

  4. An Approach to Improve the Quality of Infrared Images of Vein-Patterns

    OpenAIRE

    Chih-Lung Lin

    2011-01-01

    This study develops an approach to improve the quality of infrared (IR) images of vein-patterns, which usually have noise, low contrast, low brightness and small objects of interest, thus requiring preprocessing to improve their quality. The main characteristics of the proposed approach are that no prior knowledge about the IR image is necessary and no parameters must be preset. Two main goals are sought: impulse noise reduction and adaptive contrast enhancement technologies. In our study, a ...

  5. LOCALIZATION OF PALM DORSAL VEIN PATTERN USING IMAGE PROCESSING FOR AUTOMATED INTRA-VENOUS DRUG NEEDLE INSERTION

    Directory of Open Access Journals (Sweden)

    Mrs. Kavitha. R,

    2011-06-01

    Full Text Available Vein pattern in palms is a random mesh of interconnected and inter- wining blood vessels. This project is the application of vein detection concept to automate the drug delivery process. It dealswith extracting palm dorsal vein structures, which is a key procedure for selecting the optimal drug needle insertion point. Gray scale images obtained from a low cost IR-webcam are poor in contrast, and usually noisy which make an effective vein segmentation a great challenge. Here a new vein image segmentation method is introduced, based on enhancement techniques resolves the conflict between poor contrast vein image and good quality image segmentation. Gaussian filter is used to remove the high frequency noise in the image. The ultimate goal is to identify venous bifurcations and determine the insertion point for the needle in between their branches.

  6. Robot-assisted retinal vein cannulation with force-based puncture detection: Micron vs. the steady-hand eye robot.

    Science.gov (United States)

    Gonenc, Berk; Tran, Nhat; Gehlbach, Peter; Taylor, Russell H; Iordachita, Iulian

    2016-08-01

    Retinal vein cannulation is a demanding procedure where therapeutic agents are injected into occluded retina veins. The feasibility of this treatment is limited due to challenges in identifying the moment of venous puncture, achieving cannulation and maintaining it throughout the drug delivery period. In this study, we integrate a force-sensing microneedle with two distinct robotic systems: the handheld micromanipulator Micron, and the cooperatively controlled Steady-Hand Eye Robot (SHER). The sensed tool-to-tissue interaction forces are used to detect venous puncture and extend the robots' standard control schemes with a new position holding mode (PHM) that assists the operator hold the needle position fixed and maintain cannulation for a longer time with less trauma on the vasculature. We evaluate the resulting systems comparatively in a dry phantom, stretched vinyl membranes. Results have shown that modulating the admittance control gain of SHER alone is not a very effective solution for preventing the undesired tool motion after puncture. However, after using puncture detection and PHM the deviation from the puncture point is significantly reduced, by 65% with Micron, and by 95% with SHER representing a potential advantage over freehand for both.

  7. Intentional switches between bimanual coordination patterns are primarily effectuated by the nondominant hand

    NARCIS (Netherlands)

    de Poel, HJ; Peper, CE; Beek, PJ

    2006-01-01

    Based on indications that hand dominance is characterized by asymmetrical interlimb coupling strength (with the dominant hand exerting stronger influences on the nondominant hand than vice versa), intentional switches between rhythmic bimanual coordination patterns were predicted to be mediated prim

  8. Pulmonary vein flow pattern in children with bidirectional cavopulmonary connection or Fontan circuit

    Energy Technology Data Exchange (ETDEWEB)

    Shariat, Masoud; Yoo, Shi-Joon [Hospital for Sick Children, Department of Radiology, Toronto (Canada); Grosse-Wortmann, Lars; Windram, Jonathan [Hospital for Sick Children, Department of Cardiology, Toronto (Canada)

    2012-02-15

    Typical flow velocity profiles in the extraparenchymal pulmonary veins (PVs) demonstrate two major antegrade flow waves: a biphasic systolic wave (S), with S1 and S2 peaks and a monophasic early diastolic wave (D). Flow reversal during atrial systole (A) is common. There is agreement that the forward diastolic PV flow wave is caused by left ventricular relaxation with opening of the mitral valve. The origin of the PV systolic wave, however, remains a topic of debate. Some studies have suggested that the S wave is created by the relaxation of the left atrium and descent of the mitral valve plane. These studies have concluded that forces generated by the right ventricle (RV) have no effect on the S wave. Others suggest that the forward propagation of the right ventricular systolic pressure pulse is the major contributor to the S wave. To determine whether any part of the systolic wave of PV flow is dependent on forces created by the right ventricle. We assessed PV flow pattern, as obtained by cardiac MRI in 12 cases (39 pulmonary veins) with RV-independent pulmonary circulation (bidirectional cavopulmonary connection or Fontan circulation). Phase-contrast imaging of the PVs was performed on a 1.5-T MR scanner with velocity encoding set at 120 cm/s. We compared these flow patterns with those of a control group of ten children (15 pulmonary veins) who had RV-dependent pulmonary circulation and underwent CMR for other indications. In all PVs of children with RV-independent pulmonary circulation the flow curves showed a single systolic peak in early systole (S1) with the S2 peak consistently absent. PV flow pattern in the control group consistently showed distinct early and late systolic peaks. This study supports the concept that S2 is caused by forward propagation of the right ventricular systolic pressure pulse. It also demonstrates that the S1 is independent of the right ventricle. (orig.)

  9. Pulmonary vein flow pattern in children with bidirectional cavopulmonary connection or Fontan circuit.

    Science.gov (United States)

    Shariat, Masoud; Grosse-Wortmann, Lars; Windram, Jonathan; Yoo, Shi-Joon

    2012-02-01

    Typical flow velocity profiles in the extraparenchymal pulmonary veins (PVs) demonstrate two major antegrade flow waves: a biphasic systolic wave (S), with S1 and S2 peaks and a monophasic early diastolic wave (D). Flow reversal during atrial systole (A) is common. There is agreement that the forward diastolic PV flow wave is caused by left ventricular relaxation with opening of the mitral valve. The origin of the PV systolic wave, however, remains a topic of debate. Some studies have suggested that the S wave is created by the relaxation of the left atrium and descent of the mitral valve plane. These studies have concluded that forces generated by the right ventricle (RV) have no effect on the S wave. Others suggest that the forward propagation of the right ventricular systolic pressure pulse is the major contributor to the S wave. To determine whether any part of the systolic wave of PV flow is dependent on forces created by the right ventricle. We assessed PV flow pattern, as obtained by cardiac MRI in 12 cases (39 pulmonary veins) with RV-independent pulmonary circulation (bidirectional cavopulmonary connection or Fontan circulation). Phase-contrast imaging of the PVs was performed on a 1.5-T MR scanner with velocity encoding set at 120 cm/s. We compared these flow patterns with those of a control group of ten children (15 pulmonary veins) who had RV-dependent pulmonary circulation and underwent CMR for other indications. In all PVs of children with RV-independent pulmonary circulation the flow curves showed a single systolic peak in early systole (S1) with the S2 peak consistently absent. PV flow pattern in the control group consistently showed distinct early and late systolic peaks. This study supports the concept that S2 is caused by forward propagation of the right ventricular systolic pressure pulse. It also demonstrates that the S1 is independent of the right ventricle.

  10. 手背静脉图像分割及细化算法研究%Research on the Segmentation and Thinning Algorithms of Hand Vein Image

    Institute of Scientific and Technical Information of China (English)

    蔡超峰; 苏丹; 闫艳霞; 姜利英

    2014-01-01

    手背静脉识别技术通常基于静脉纹路的细节特征点对个人身份进行验证。为了准确地提取出手背静脉纹路中的细节特征点,提取手背静脉图像中的有效区域并对其进行归一化、增强和去噪处理,分别采用局部最大类间方差法(OSTU)、阈值图像法和NiBlack法对图像进行分割,分别采用Hilditch算法、快速细化算法、Zhang&Suen算法和OPTA算法对分割后得到的二值图像进行细化以获取静脉纹路。实验结果表明,基于合理的参数,NiBlack 法和Hilditch算法分别取得较好的分割与细化处理结果。%Minutiae of hand vein skeleton are usually employed in personal identification recognition. To extract the minutiae of hand vein skeleton accurately, extracts and normalizes the effective area of hand vein image and enhances followed by noise reduction. Uses the OSTU method, Threshold Image method and NiBlack method to segment the image. Uses the Hilditch algorithm, Fast algorithm, Zhang&Suen al-gorithm and OPTA algorithm to obtain the hand vein skeleton. The results indicate that, given reasonable parameters, the NiBlack method and the Hilditch algorithm do well in the hand vein segmentation and thinning, respectively.

  11. 手背静脉图像预处理算法研究%Research on Pretreatment Algorithm of Hand Vein Image

    Institute of Scientific and Technical Information of China (English)

    杨晓鹏; 蔡超峰; 潘珩; 赵玉霞

    2013-01-01

    As an innovative authentication way, the hand vein recognition technology is provided with great realistic signiifcance and market potential. Minutiae of hand vein skeleton are usually employed in personal identiifcation recognition. To extract the minutiae of hand vein skeleton accurately, the effective area of hand vein image was extracted ifrstly and then normalized. Next, the partially overlapped sub-block histogram equalization (POSHE) was employed to enhance the contrast of the image followed by noise reduction. At last, the NiBlack algorithm was employed to segment the image and the Hilditch algorithm was employed to ifne treatment to obtain the hand vein skeleton.%作为一种新颖的身份认证方式,手背静脉识别技术具有非常重要的现实意义和市场潜力。手背静脉识别通常基于静脉纹路的细节特征点对个人身份进行识别。为了准确地提取手背静脉图像的细节特征点,本文首先提取手背静脉图像中的有效区域并对其进行归一化;再利用子块部分重叠局部直方图均衡化算法对图像进行对比度增强并去除其中的斑点噪声和扫描噪声;最后分别采用NiBlack法和Hilditch算法对图像进行分割和细化处理,得到手背静脉图像的纹路信息。

  12. Dorsal hand vein responses to the α₁-adrenoceptor agonist phenylephrine do not predict responses to the α₂-adrenoceptor agonist dexmedetomidine.

    Science.gov (United States)

    Posti, Jussi P; Valve, Laura; Ruohonen, Saku; Akkila, Juha; Scheinin, Mika; Snapir, Amir

    2011-02-25

    Significant inter-individual variability exists in responses of human dorsal hand veins to activation of α-adrenoceptors. Simultaneous graded infusions of the α₁- and α₂-adrenoceptor agonists phenylephrine (3.66-8000 ng/min) and dexmedetomidine (0.0128-1000 ng/min) were given into dorsal veins of both hands and responses of 75 subjects were analyzed to assess whether a subject's sensitivity to phenylephrine (ED(50)) predicts his sensitivity to dexmedetomidine. Individual ED(50) estimates of dexmedetomidine and phenylephrine ranged between 0.06-412 and 14.2-7450 ng/min and exhibited only a weak positive relationship (r² =0.074, P=0.018). Finger temperature, body mass index, age and phenylephrine sensitivity together accounted for about 30% of dexmedetomidine ED(50) variation (r² =0.315, Phand veins to both α₁- and α₂-adrenoceptor agonists is not explained by some common factors; instead, dorsal hand vein responsivity is separately determined for both receptor mechanisms.

  13. An Approach to Improve the Quality of Infrared Images of Vein-Patterns

    Directory of Open Access Journals (Sweden)

    Chih-Lung Lin

    2011-12-01

    Full Text Available This study develops an approach to improve the quality of infrared (IR images of vein-patterns, which usually have noise, low contrast, low brightness and small objects of interest, thus requiring preprocessing to improve their quality. The main characteristics of the proposed approach are that no prior knowledge about the IR image is necessary and no parameters must be preset. Two main goals are sought: impulse noise reduction and adaptive contrast enhancement technologies. In our study, a fast median-based filter (FMBF is developed as a noise reduction method. It is based on an IR imaging mechanism to detect the noisy pixels and on a modified median-based filter to remove the noisy pixels in IR images. FMBF has the advantage of a low computation load. In addition, FMBF can retain reasonably good edges and texture information when the size of the filter window increases. The most important advantage is that the peak signal-to-noise ratio (PSNR caused by FMBF is higher than the PSNR caused by the median filter. A hybrid cumulative histogram equalization (HCHE is proposed for adaptive contrast enhancement. HCHE can automatically generate a hybrid cumulative histogram (HCH based on two different pieces of information about the image histogram. HCHE can improve the enhancement effect on hot objects rather than background. The experimental results are addressed and demonstrate that the proposed approach is feasible for use as an effective and adaptive process for enhancing the quality of IR vein-pattern images.

  14. An approach to improve the quality of infrared images of vein-patterns.

    Science.gov (United States)

    Lin, Chih-Lung

    2011-01-01

    This study develops an approach to improve the quality of infrared (IR) images of vein-patterns, which usually have noise, low contrast, low brightness and small objects of interest, thus requiring preprocessing to improve their quality. The main characteristics of the proposed approach are that no prior knowledge about the IR image is necessary and no parameters must be preset. Two main goals are sought: impulse noise reduction and adaptive contrast enhancement technologies. In our study, a fast median-based filter (FMBF) is developed as a noise reduction method. It is based on an IR imaging mechanism to detect the noisy pixels and on a modified median-based filter to remove the noisy pixels in IR images. FMBF has the advantage of a low computation load. In addition, FMBF can retain reasonably good edges and texture information when the size of the filter window increases. The most important advantage is that the peak signal-to-noise ratio (PSNR) caused by FMBF is higher than the PSNR caused by the median filter. A hybrid cumulative histogram equalization (HCHE) is proposed for adaptive contrast enhancement. HCHE can automatically generate a hybrid cumulative histogram (HCH) based on two different pieces of information about the image histogram. HCHE can improve the enhancement effect on hot objects rather than background. The experimental results are addressed and demonstrate that the proposed approach is feasible for use as an effective and adaptive process for enhancing the quality of IR vein-pattern images.

  15. Hand eczema: Correlation of morphologic patterns, atopy, contact sensitization and disease severity

    OpenAIRE

    2012-01-01

    Background: Hand eczema is a common distressing condition aggravated by a number of endogenous and exogenous factors. Various morphological forms of hand eczema have been described, but categorization into one of them is not always possible. Aims: To study the morphological patterns of hand eczema, relationship of atopy with hand eczema, and the implications of contact sensitization with respect to severity and diagnosis of hand eczema. Methods: Hundred consecutive patients of hand eczema att...

  16. Occupational hand injury patterns at Avicenna University Hospital

    Directory of Open Access Journals (Sweden)

    Abdelmoughit Echchaoui

    2017-08-01

    Conclusion: Hand injuries are common in the workplace and affect mostly active and working-age people. Preventive measures are required and should receive appropriate attention and resources. [Hand Microsurg 2017; 6(2.000: 75-80

  17. 一种新的手背静脉分割方法%A New Segmentation Method of Hand Dorsal Vein Image

    Institute of Scientific and Technical Information of China (English)

    鲁周迅; 张彬彬

    2014-01-01

    手背静脉显示仪是近年来刚刚兴起的医疗设备,但由于采集到的手背静脉图像质量对比度很低,迄今为止,此设备对静脉血管的提取仍不是很精确。针对此问题,提出了一种新的静脉提取方法,运用改进的直方图均衡化算法,结合NiBlack分割方法对图像进行静脉提取。通过仿真,与限制对比度自适应直方图均衡化算法(CLAHE)比较,分割效果上取得了一定的提高。%Hand dorsal vein display device has been invented in recent years ,but because the hand dorsal vein images have lower contrast degrees ,so for ,this equipment is still not very precise for the extraction of blood vessels .For this problem ,this paper presents a new vein extraction method ,which complete the extraction of vein with improved histogram equalization algorithm and NiBlack segmentation method .Through simulation ,compared with contrast limited adaptive histogram equalization algorithm (CLAHE ) ,the segmentation effect has made some improvement .

  18. Expression of Genes Involved in Drosophila Wing Morphogenesis and Vein Patterning Are Altered by Spaceflight

    Science.gov (United States)

    Parsons-Wingerter, Patricia A.; Hosamani, Ravikumar; Bhattacharya, Sharmila

    2015-01-01

    Imaginal wing discs of Drosophila melanogaster (fruit fly) defined during embryogenesis ultimately result in mature wings of stereotyped (specific) venation patterning. Major regulators of wing disc development are the epidermal growth factor receptor (EGF), Notch, Hedgehog (Hh), Wingless (Wg), and Dpp signaling pathways. Highly stereotyped vascular patterning is also characteristic of tissues in other organisms flown in space such as the mouse retina and leaves of Arabidopsis thaliana. Genetic and other adaptations of vascular patterning to space environmental factors have not yet been systematically quantified, despite widespread recognition of their critical importance for terrestrial and microgravity applications. Here we report changes in gene expression with space flight related to Drosophila wing morphogenesis and vein patterning. In addition, genetically modified phenotypes of increasingly abnormal ectopic wing venation in the Drosophila wing1 were analyzed by NASA's VESsel GENeration Analysis (VESGEN) software2. Our goal is to further develop insightful vascular mappings associated with bioinformatic dimensions of genetic or other molecular phenotypes for correlation with genetic and other molecular profiling relevant to NASA's GeneLab and other Space Biology exploration initiatives.

  19. 基于SURF算子的快速手背静脉识别%Fast recognition of hand vein with SURF descriptors

    Institute of Scientific and Technical Information of China (English)

    李秀艳; 刘铁根; 邓仕超; 何瑾; 王云新

    2011-01-01

    A recognition algorithm for hand vein based on speeded-up robust features( SURF) was proposed. Firstly,the region of interest ( ROI) of the hand vein image is obtained through image preprocessing. The local SURF features of test sample and register samples are extracted and matched based on Euclid distance, and then the mismatching pairs are rejected. Finally, the matching rate is calculated as the similarity between registered sample and test sample to realize personal identity recognition. The recognition performance was evaluated in verification mode using TJU hand vein image database, the equal error rate ( EER) is 0.07% and average recognition time is 0.153 s. Experimental results show that the proposed algorithm is able to realize hand vein recognition reliably and quickly.%提出基于加速鲁棒性特征(speeded-up robustfeatures,SURF)的手背静脉识别算法.首先对手背静脉图像进行预处理,提取手背静脉感兴趣区域(ROI),然后提取手背静脉的局部SURF特征,基于欧式距离实现测试样本和注册样本特征点的匹配,并剔除错误匹配对,最后计算匹配率作为待识别样本和注册样本之间的相似度测试实现身份识别.利用TJU手背静脉图像数据库对算法性能进行测试,在认证模式下等错率为0.07%,平均识别时间0.153 s.实验结果证明该算法可以快速有效地实现手背静脉识别.

  20. Concomitant relationship and clinical signifiance of the arteries and veins of hand%手部动静脉伴行关系及临床意义

    Institute of Scientific and Technical Information of China (English)

    李忠华; 钟世镇; 石瑾; 王兴海; 洪辉文; 刘畅

    2001-01-01

    目的:为手外科提供手部动、静脉伴行关系的规律性。方法:10例新鲜带前臂的手部标本,血管分别灌注过氯乙烯乙酸乙酯或乳胶填充剂,制成动、静脉分色腐蚀铸型标本和解剖剥制标本,观察手部动、静脉伴行关系。结果:手部浅、深血管弓,掌心血管,指掌侧总血管动、静脉呈紧密伴行关系。手掌侧和背侧部浅血管以及手指的掌侧和背侧部血管,动、静脉无伴行关系或伴行不紧密。结论:手部动静脉血管配布规律是:浅层血管呈网络型分布,动静脉无伴行关系,越接近深部,动静脉伴行关系越紧密。指部血管伴行关系都不紧密或没有伴行关系。%Objective: To provide hand surgery with the regularity of concomitant relationship between the arteries and veins of hand.Methods: Concomitant relationship between the arteries and veins of hand were observed in 10 sides decicolor cast specimens and stuffing specimens perfused with hyperchlororinylaceticether or emulsoid.Results: Tight concomitant relationship was observed in the superficial and deep arcus vasclar, palmar metacarpal vessels and common palmar digital vessels.In the palm and the opisthenar, the superficial vessels were not concomitant or not concomitant tightly, so were the vessels of maniphalanx.Conclusion: The distribution regularity between the arteries and veins of hand was showed as follow: Like a network, vessels are not concomitant in the superficial laminae of hand.However, deeper to the partes profunda of the hand, more tight concomitant relationship between the arteries and veins was found.The vessels of the maniphalanx are not concomitant or not tight concomitant.

  1. Prevalence and pattern of radiographic hand osteoarthritis and association with pain and disability (the Rotterdam study)

    NARCIS (Netherlands)

    S. Dahaghin; S.M. Bierma-Zeinstra (Sita); A.Z. Ginai (Abida); H.A.P. Pols (Huib); J.M.W. Hazes (Mieke); B.W. Koes (Bart)

    2005-01-01

    textabstractOBJECTIVE: To investigate the prevalence and pattern of radiographic osteoarthritis (ROA) of the hand joints and its association with self reported hand pain and disability. METHODS: Baseline data on a population based study (age >/=55 years) were used (n = 3906). Hand

  2. A Design of Dorsal Hand Vein Image Acquisition System Based on Near Infrared Technology%近红外手背静脉图像采集系统的研究与设计

    Institute of Scientific and Technical Information of China (English)

    潘晓苹; 汪天富; 庄礼杰; 刘军

    2013-01-01

    Dorsal hand vein pattern recognition is a new biometric identification technology, with the virtue of living body recognition , inner characteristic, and non-contact. The image acquisition system based on near infrared technology is popular because of lost cost. The system is designed using near infrared technology. The experimental results show that the system can capture high-contrast dorsal hand vein images under 850 nm near infrared.%  手背静脉识别是新颖的身份认证技术,与指纹识别相比,具有活体识别、内部特征、非接触式等优点。基于近红外技术的手背图像采集设备具有制作成本低的优势,是实际应用中首选的技术。文章研究了基于近红外技术的手背静脉图像采集系统及制作,实验结果表明,在850 nm 的近红外光波下,可以采集到高对比度的手背静脉图像。对手背静脉身份识别系统制作具有参考价值。

  3. An Approach for Pattern Recognition of EEG Applied in Prosthetic Hand Drive

    Directory of Open Access Journals (Sweden)

    Xiao-Dong Zhang

    2011-12-01

    Full Text Available For controlling the prosthetic hand by only electroencephalogram (EEG, it has become the hot spot in robotics research to set up a direct communication and control channel between human brain and prosthetic hand. In this paper, the EEG signal is analyzed based on multi-complicated hand activities. And then, two methods of EEG pattern recognition are investigated, a neural prosthesis hand system driven by BCI is set up, which can complete four kinds of actions (arm’s free state, arm movement, hand crawl, hand open. Through several times of off-line and on-line experiments, the result shows that the neural prosthesis hand system driven by BCI is reasonable and feasible, the C-support vector classifiers-based method is better than BP neural network on the EEG pattern recognition for multi-complicated hand activities.

  4. The effect of residency and fellowship type on hand surgery clinical practice patterns.

    Science.gov (United States)

    Mehta, Karan; Pierce, Paul; Chiu, David T W; Thanik, Vishal

    2015-01-01

    The Accreditation Council for Graduate Medical Education requires accredited fellowship programs to exhibit proficiency in six broadly defined domains; however, core competencies specifically mandated for hand surgery training have yet to be established. Several studies have demonstrated significant disparities in exposure to essential skills and knowledge between orthopedic surgery- and plastic surgery-based hand surgery fellowship programs. To determine whether significant discrepancies also exist after fellowship between hand surgeons trained in orthopedic surgery and those trained in plastic surgery, clinical practice patterns were evaluated. A 20-question survey was created and distributed electronically to American Society for Surgery of the Hand and American Association for Hand Surgery members. Responses were compared using descriptive statistics. Nine hundred eighty-two hand surgeons (76 percent orthopedic and 24 percent plastic) responded, representing a 39 percent response rate. Most plastic surgery hand practices were academic-based (41 percent), whereas orthopedic practices were private (67 percent). More orthopedic hand surgeons worked in multipractitioner practices than plastic surgeons (54 percent versus 30 percent; p digital replantation cases (53 percent versus 22 percent; p < 0.05) but treated significantly fewer open reduction and internal fixation distal radius fractures. Orthopedic and plastic surgery hand surgeons differ significantly in their clinical practice patterns. Differences in clinical exposure during training are reflected in practice and persist over time. Referral patterns and practice situations are also contributors to ultimate practice patterns.

  5. An Analysis of Intrinsic and Extrinsic Hand Muscle EMG for Improved Pattern Recognition Control.

    Science.gov (United States)

    Adewuyi, Adenike A; Hargrove, Levi J; Kuiken, Todd A

    2016-04-01

    Pattern recognition control combined with surface electromyography (EMG) from the extrinsic hand muscles has shown great promise for control of multiple prosthetic functions for transradial amputees. There is, however, a need to adapt this control method when implemented for partial-hand amputees, who possess both a functional wrist and information-rich residual intrinsic hand muscles. We demonstrate that combining EMG data from both intrinsic and extrinsic hand muscles to classify hand grasps and finger motions allows up to 19 classes of hand grasps and individual finger motions to be decoded, with an accuracy of 96% for non-amputees and 85% for partial-hand amputees. We evaluated real-time pattern recognition control of three hand motions in seven different wrist positions. We found that a system trained with both intrinsic and extrinsic muscle EMG data, collected while statically and dynamically varying wrist position increased completion rates from 73% to 96% for partial-hand amputees and from 88% to 100% for non-amputees when compared to a system trained with only extrinsic muscle EMG data collected in a neutral wrist position. Our study shows that incorporating intrinsic muscle EMG data and wrist motion can significantly improve the robustness of pattern recognition control for application to partial-hand prosthetic control.

  6. Use of Design Patterns According to Hand Dominance in a Mobile User Interface

    Science.gov (United States)

    Al-Samarraie, Hosam; Ahmad, Yusof

    2016-01-01

    User interface (UI) design patterns for mobile applications provide a solution to design problems and can improve the usage experience for users. However, there is a lack of research categorizing the uses of design patterns according to users' hand dominance in a learning-based mobile UI. We classified the main design patterns for mobile…

  7. Use of Design Patterns According to Hand Dominance in a Mobile User Interface

    Science.gov (United States)

    Al-Samarraie, Hosam; Ahmad, Yusof

    2016-01-01

    User interface (UI) design patterns for mobile applications provide a solution to design problems and can improve the usage experience for users. However, there is a lack of research categorizing the uses of design patterns according to users' hand dominance in a learning-based mobile UI. We classified the main design patterns for mobile…

  8. Nursing Experience of Hand Vein Transfusion Patients%临床手背静脉输液患者的护理

    Institute of Scientific and Technical Information of China (English)

    王晓红

    2015-01-01

    目的:讨论临床上手背静脉输液患者的护理要点,总结护理经验。方法对我科890例次手背静脉输液患者的资料进行回顾性分析总结。结果有效及时的护理是保证输液顺利的关键,同时能提高患者对医护人员满意度。结论通过对手背静脉输液患者的正确护理提高了护理质量。%Objective To discuss the clinical nursing key points of hand vein transfusion patients, and sum up nursing experience. Methods Patients with my families and 890 cases of hand vein infusion of summary data were retrospectively analyzed. Results Ef ective and timely nursing is the key to ensure transfusion smoothly, at the same time can improve the patients on medical staf satisfaction. Conclusion Through the opponent back intravenous infusion in patients with cor ect nursing improves the nursing quality.

  9. Virtual Control of Prosthetic Hand Based on Grasping Patterns and Estimated Force from Semg

    Directory of Open Access Journals (Sweden)

    Zhu Gao-Ke

    2016-01-01

    Full Text Available Myoelectric prosthetic hands aim to serve upper limb amputees. The myoelectric control of the hand grasp action is a kind of real-time or online method. Thus it is of great necessity to carry on a study of online prosthetic hand electrical control. In this paper, the strategy of simultaneous EMG decoding of grasping patterns and grasping force was realized by controlling a virtual multi-degree-freedom prosthetic hand and a real one-degree-freedom prosthetic hand simultaneously. The former realized the grasping patterns from the recognition of the sEMG pattern. The other implemented the grasping force from sEMG force decoding. The results show that the control method is effective and feasible.

  10. Pattern Differences of Small Hand Muscle Atrophy in Amyotrophic Lateral Sclerosis and Mimic Disorders

    Directory of Open Access Journals (Sweden)

    Jia Fang

    2016-01-01

    Conclusions: The different patterns of small hand muscle atrophy between the ALS patients and the patients with mimic disorders presumably reflect distinct pathophysiological mechanisms underlying different disorders, and may aid in distinguishing between ALS and mimic disorders.

  11. Doppler ultrasound evaluation of pattern of venous incompetance and relation with skin changes in varicose vein patients

    Directory of Open Access Journals (Sweden)

    HP Pant

    2015-06-01

    Full Text Available BACKGROUND Varicosity of lower limb is a common problem in agricultural country like Nepal. Doppler ultrasound is a standard investigation modality for confirmation of diagnosis, evaluation of severity and venous mapping to plan treatment. We aim to find out the epidemiology, common pattern of incompetance, severity assessment by doppler and association of the important doppler variables with skin changes. METHODOLOGY Doppler venous study was done in 56 patients from june 2013 to july 2014. Patients with deep vein thrombosis and peripheral arterial disease were excluded. Altogether 56 patients, 96 limbs were studied. Data was entered in preformed proforma. Doppler study was conducted by senior radiologist with linear probes. Data was entered in SPSS software version 16 and statistical significance was calculated using chi square test. RESULTS Bilateral limb involvement was seen in 40 patients and unilateral in 16 patuents only. Skin related changes were seen in 58 limbs. Saphenofemoral junction incompetance was seen in 79(82.2% limbs and was most common pattern of incompetance. Overall, superficial veins were involved in 88(91.7% limbs and deep in 30(31.2% limbs. Prolonged duration of varicosity (>9 year (p=0.000, bilateral limb involvement(p=0.024, reflux in deep venous system(p=0.002, larger Greater Saphenous Vein (GSV size(p=0.003, prolonged duration of reflux(p=0.000 and perforator incompetence (p=0.002 were associated with skin changes. GSV diameter more than 7 mm was associated with reflux significantly (P=0.002. CONCLUSION Superficial vein incompetance is common pattern compared to deep venous system. Sapheno Femoral Junction (SFJ incompetance is the commonest pattern. Larger caliber of vein, prolonged duration of reflux, reflux in deep venous system and perforator insufficiency are significantly associated with skin changes.DOI: http://dx.doi.org/10.3126/jcmsn.v10i3.12770 Journal of College of Medical Sciences-Nepal, 2014, Vol-10, No-3

  12. Research on Gesture Definition and Electrode Placement in Pattern Recognition of Hand Gesture Action SEMG

    Science.gov (United States)

    Zhang, Xu; Chen, Xiang; Zhao, Zhang-Yan; Tu, You-Qiang; Yang, Ji-Hai; Lantz, Vuokko; Wang, Kong-Qiao

    The goal of this study is to explore the effects of electrode place-ment on the hand gesture pattern recognition performance. We have conducted experiments with surface EMG sensors using two detecting electrode channels. In total 25 different hand gestures and 10 different electrode positions for measuring muscle activities have been evaluated. Based on the experimental results, dependencies between surface EMG signal detection positions and hand gesture recognition performance have been analyzed and summarized as suggestions how to define hand gestures and select suitable electrode positions for a myoelectric control system. This work provides useful insight for the development of a medical rehabilitation system based on EMG technique.

  13. The Vein Patterning 1 (VEP1 gene family laterally spread through an ecological network.

    Directory of Open Access Journals (Sweden)

    Rosa Tarrío

    Full Text Available Lateral gene transfer (LGT is a major evolutionary mechanism in prokaryotes. Knowledge about LGT--particularly, multicellular--eukaryotes has only recently started to accumulate. A widespread assumption sees the gene as the unit of LGT, largely because little is yet known about how LGT chances are affected by structural/functional features at the subgenic level. Here we trace the evolutionary trajectory of VEin Patterning 1, a novel gene family known to be essential for plant development and defense. At the subgenic level VEP1 encodes a dinucleotide-binding Rossmann-fold domain, in common with members of the short-chain dehydrogenase/reductase (SDR protein family. We found: i VEP1 likely originated in an aerobic, mesophilic and chemoorganotrophic α-proteobacterium, and was laterally propagated through nets of ecological interactions, including multiple LGTs between phylogenetically distant green plant/fungi-associated bacteria, and five independent LGTs to eukaryotes. Of these latest five transfers, three are ancient LGTs, implicating an ancestral fungus, the last common ancestor of land plants and an ancestral trebouxiophyte green alga, and two are recent LGTs to modern embryophytes. ii VEP1's rampant LGT behavior was enabled by the robustness and broad utility of the dinucleotide-binding Rossmann-fold, which provided a platform for the evolution of two unprecedented departures from the canonical SDR catalytic triad. iii The fate of VEP1 in eukaryotes has been different in different lineages, being ubiquitous and highly conserved in land plants, whereas fungi underwent multiple losses. And iv VEP1-harboring bacteria include non-phytopathogenic and phytopathogenic symbionts which are non-randomly distributed with respect to the type of harbored VEP1 gene. Our findings suggest that VEP1 may have been instrumental for the evolutionary transition of green plants to land, and point to a LGT-mediated 'Trojan Horse' mechanism for the evolution of

  14. Impact of Portal Vein Involvement from Pancreatic Cancer on Metastatic Pattern After Surgical Resection.

    Science.gov (United States)

    Mierke, Franz; Hempel, Sebastian; Distler, Marius; Aust, Daniela E; Saeger, Hans-Detlev; Weitz, Jürgen; Welsch, Thilo

    2016-12-01

    The present study aims to evaluate the long-term outcome and metastatic pattern of patients who underwent resection of a pancreatic ductal adenocarcinoma (PDAC) with portal or superior mesenteric vein (PV/SMV) resection. Patients who underwent a partial pancreatoduodenectomy or total pancreatectomy for PDAC between 2005 and 2015 were retrospectively analyzed. Three subgroups were generated, depending on PV/SMV resection (P(+)) and pathohistological PV/SMV tumor infiltration (I(+)): P(+)I(+), P(+)I(-), and P(-)I(-). Statistical analysis was performed using the R software package. The study cohort included 179 patients, 113 of whom underwent simultaneous PV/SMV resection. Thirty-six patients (31.9 %) had pathohistological tumor infiltration of the PV/SMV (P(+)I(+)), and were matched with 66 cases without PV/SMV infiltration (P(-)I(-)). The study revealed differences in overall median survival (11.9 [P(+)I(+)] vs. 16.1 [P(+)I(-)] vs. 20.1 [P(-)I(-)] months; p = 0.01). Multivariate survival analysis identified true invasion of the PV/SMV as the only significant, negative prognostic factor (p = 0.01). Whereas the incidence of local recurrence was comparable (p = 0.96), the proportion of patients with distant metastasis showed significant differences (75 % [P(+)I(+)] vs. 45.8 % [P(+)I(-)] vs. 54.7 % [P(-)I(-)], p = 0.01). Furthermore, the median time to progression was significantly shorter if the PV/SMV was involved (7.4 months [P(+)I(+)] vs. 10.9 months [P(+)I(-)] vs. 11.6 months [P(-)I(-)]). Initial liver metastases occurred in 33 % of the patients. True invasion of the PV/SMV is an independent risk factor for overall survival, and is associated with a higher incidence of distant metastasis and shorter progressive-free survival. Radical vascular resection cannot compensate for aggressive tumor biology.

  15. A novel myoelectric pattern recognition strategy for hand function restoration after incomplete cervical spinal cord injury.

    Science.gov (United States)

    Liu, Jie; Zhou, Ping

    2013-01-01

    This study presents a novel myoelectric pattern recognition strategy towards restoration of hand function after incomplete cervical spinal cord Injury (SCI). High density surface electromyogram (EMG) signals comprised of 57 channels were recorded from the forearm of nine subjects with incomplete cervical SCI while they tried to perform six different hand grasp patterns. A series of pattern recognition algorithms with different EMG feature sets and classifiers were implemented to identify the intended tasks of each SCI subject. High average overall accuracies (> 97%) were achieved in classification of seven different classes (six intended hand grasp patterns plus a hand rest pattern), indicating that substantial motor control information can be extracted from partially paralyzed muscles of SCI subjects. Such information can potentially enable volitional control of assistive devices, thereby facilitating restoration of hand function. Furthermore, it was possible to maintain high levels of classification accuracy with a very limited number of electrodes selected from the high density surface EMG recordings. This demonstrates clinical feasibility and robustness in the concept of using myoelectric pattern recognition techniques toward improved function restoration for individuals with spinal injury.

  16. Hand eczema: Correlation of morphologic patterns, atopy, contact sensitization and disease severity

    Directory of Open Access Journals (Sweden)

    Sanjeev Handa

    2012-01-01

    Full Text Available Background: Hand eczema is a common distressing condition aggravated by a number of endogenous and exogenous factors. Various morphological forms of hand eczema have been described, but categorization into one of them is not always possible. Aims: To study the morphological patterns of hand eczema, relationship of atopy with hand eczema, and the implications of contact sensitization with respect to severity and diagnosis of hand eczema. Methods: Hundred consecutive patients of hand eczema attending the contact dermatitis clinic of the institute were recruited over a two year period from 2004-05. Objective assessment was done using hand eczema severity index (HECSI and all the patients were patch tested using Indian standard series. Results: Unspecified type of hand eczema with no definite morphologic picture was seen in 62% followed by pompholyx in 14%. Hand eczema severity was not found to be statistically associated with age, sex, and atopic status of the patient. Positive patch test to one or more allergen was present in 65% of patients. The most common allergens were potassium dichromate (25%, fragrance mix (16%, nickel sulphate (14%, and PPD (13%. There was no significant correlation between patch test positivity and hand eczema severity or atopic status of the patient. Among the morphological patterns pompholyx was strongly associated with an atopic status (P=0.004. Conclusions: Hand eczema was seen twice more commonly in men. Atopic and non-atopic patients of hand eczema had no difference in the severity of disease. Contact sensitivity to different allergens did not correlate with increased eczema severity.

  17. Prevalence, pattern and risk factors of retinal vein occlusion in an elderly population in Nepal: the Bhaktapur retina study.

    Science.gov (United States)

    Thapa, Raba; Bajimaya, Sanyam; Paudyal, Govinda; Khanal, Shankar; Tan, Stevie; Thapa, Suman S; van Rens, Ger

    2017-09-02

    This study aims to explore the prevalence, pattern and risk factors of retinal vein occlusion (RVO) in an elderly population of Nepal. One thousand eight hundred sixty subjects of age 60 years and above were enrolled in a population-based, cross-sectional study. Detailed history, visual acuity, anterior segment and posterior segment examinations were done. Blood pressure, non-fasting blood sugar, body mass index and abdominal girth were measured. Retinal vein occlusions were further divided into branch retinal (BRVO), hemi-retinal and central retinal vein occlusion (CRVO). Age ranged from 60 to 95 years with a mean of 69.64 ± 7.31 years. Overall population prevalence for RVO was 2.95% (95% Confidence interval (CI): 2.23-3.83), BRVO 2.74% (95% CI: 2.05-3.58) and CRVO 0.21% (95% CI: 0.06-0.55). BRVO was seen in 51 subjects (92.73%) and CRVO in 4 (7.27%). Among the total RVO, unilateral and bilateral involvement was 85.45% and 14.55%, respectively. Among the subjects with BRVO and CRVO, 37.25% and 50% had low vision, respectively. The risk of RVO increased with ageing and was more among males. There was an increased risk of RVO among those with hypertension, and with diabetes and hypertension. There was also an increased risk of RVO among subjects with hypermetropia, those with pseudophakia and those who were smokers and consumed alcohol. Retinal vein occlusion is a common retinal vascular disorder in the elderly population of Nepal. The main risk factors for RVO were increasing age and hypertension.

  18. The influence of wheelchair propulsion hand pattern on upper extremity muscle power and stress.

    Science.gov (United States)

    Slowik, Jonathan S; Requejo, Philip S; Mulroy, Sara J; Neptune, Richard R

    2016-06-14

    The hand pattern (i.e., full-cycle hand path) used during manual wheelchair propulsion is frequently classified as one of four distinct hand pattern types: arc, single loop, double loop or semicircular. Current clinical guidelines recommend the use of the semicircular pattern, which is based on advantageous levels of broad biomechanical metrics implicitly related to the demand placed on the upper extremity (e.g., lower cadence). However, an understanding of the influence of hand pattern on specific measures of upper extremity muscle demand (e.g., muscle power and stress) is needed to help make such recommendations, but these quantities are difficult and impractical to measure experimentally. The purpose of this study was to use musculoskeletal modeling and forward dynamics simulations to investigate the influence of the hand pattern used on specific measures of upper extremity muscle demand. The simulation results suggest that the double loop and semicircular patterns produce the most favorable levels of overall muscle stress and total muscle power. The double loop pattern had the lowest full-cycle and recovery-phase upper extremity demand but required high levels of muscle power during the relatively short contact phase. The semicircular pattern had the second-lowest full-cycle levels of overall muscle stress and total muscle power, and demand was more evenly distributed between the contact and recovery phases. These results suggest that in order to decrease upper extremity demand, manual wheelchair users should consider using either the double loop or semicircular pattern when propelling their wheelchairs at a self-selected speed on level ground.

  19. Shape-based hand recognition approach using the morphological pattern spectrum

    Science.gov (United States)

    Ramirez-Cortes, Juan Manuel; Gomez-Gil, Pilar; Sanchez-Perez, Gabriel; Prieto-Castro, Cesar

    2009-01-01

    We propose the use of the morphological pattern spectrum, or pecstrum, as the base of a biometric shape-based hand recognition system. The system receives an image of the right hand of a subject in an unconstrained pose, which is captured with a commercial flatbed scanner. According to pecstrum property of invariance to translation and rotation, the system does not require the use of pegs for a fixed hand position, which simplifies the image acquisition process. This novel feature-extraction method is tested using a Euclidean distance classifier for identification and verification cases, obtaining 97% correct identification, and an equal error rate (EER) of 0.0285 (2.85%) for the verification mode. The obtained results indicate that the pattern spectrum represents a good feature-extraction alternative for low- and medium-level hand-shape-based biometric applications.

  20. CVP2- and CVL1-mediated phosphoinositide signaling as a regulator of the ARF GAP SFC/VAN3 in establishment of foliar vein patterns.

    Science.gov (United States)

    Carland, Francine; Nelson, Timothy

    2009-09-01

    In foliar organs of dicots, veins are arranged in a highly branched or reticulated pattern for efficient distribution of water, photosynthates and signaling molecules. Recent evidence suggests that the patterns rely in part on regulation of intracellular vesicle transport and cell polarity in selected cells during leaf development. The sorting of vesicle cargos to discrete cellular sites is regulated in yeast and animal cells by the binding of specific phosphoinositides (PIs). We report here that, in the plant Arabidopsis, specific PIs guide the vesicle traffic that is essential for polarized and continuous vein pattern formation. Mutations in SFC/VAN3, an ADP-ribosylation factor GTPase-activating protein (ARF GAP) with a PI-binding pleckstrin homology domain, result in discontinuous vein patterns. Plants with mutations in both CVP2 and CVL1, which encode inositol polyphosphate 5'-phosphatases that generate the specific PI ligand for the pleckstrin homology domain of SFC/VAN3, phosphatidylinositol-4-monophosphate (PI(4)P), have a discontinuous vein phenotype identical to that of sfc/van3 mutants. Single cvp2 or cvl1 mutants show weak and no discontinuous vein phenotypes, respectively, suggesting that they act redundantly. We propose that these two 5'-phosphatases regulate vein continuity and cell polarity by generating a specific PI ligand for SFC/VAN3.

  1. Study on near infrared finger vein image acquisition and vein pattern extraction%红外光指静脉图像采集及其特征提取技术的研究

    Institute of Scientific and Technical Information of China (English)

    江虹; 郭树旭

    2011-01-01

    In recent years,the vein recognition has opened up biometric technology′s new eras.The optical image quality of finger vein acquisition and the accuracy of vein pattern extraction are key issues.In this paper,a novel optical illuminating/detecting method is proposed for the near infrared finger vein image acquisition system,and a finger vein pattern extraction method based on the maximum curvature mechanism is realized.The effectiveness of the whole system is experimentally verified.The experimental results show that the FAR is 1.67%.%提出了一种应用于指静脉光学图像采集系统的新型光路设计,实现了基于最大曲率方法的指静脉提取,并对系统的有效性进行了实验验证。结果表明,采用本文方法的指静脉识别错误匹配率(FAR)为1.67%。

  2. Varicose Veins

    Science.gov (United States)

    Varicose veins are swollen, twisted veins that you can see just under the skin. They usually occur in ... of the body. Hemorrhoids are a type of varicose vein. Your veins have one-way valves that help ...

  3. Frequency of β-lactamase enzyme and antibiogram pattern in bacterial flora isolated from staffs hands

    Directory of Open Access Journals (Sweden)

    Shilla Jalalpoor

    2011-12-01

    Full Text Available Background: β-lactamase is an enzyme that can inactivate β–Lactam family antibiotics. High prevalence of β-lactamase producer bacteria on the staff hands, due to antibiotic resistance and nosocomial infection in hospitalized patients. The objective of this study was to assess the frequency of β-lactamase positive bacteria and antibiogram pattern in bacterial flora isolated from staff hands of the Al-Zahra hospital in Isfahan.Materials and Method: This laboratory research was performed during of 2005-2007 in Al-Zahra hospital in Isfahan. According to statistical formula, we randomly selected 80 samples from staff hands. Staff hand samples collected with finger print method. Bacterial identification was performed with microbiological methods and β–lactamase production was performed with Acidometric method and antibiogram pattern was performed with Kirby Bauer method.Results: According to the acidometric test results of 80 isolated staff hands, 61.85% of strains produce β–lactamase. Staphylococcus spp., Bacillus spp. and Enterobacteriaceae were the most important producers respectively (70.83%, 64.72% and 50%. According to antibiogram test results, penicillin and vancomycin had the highest and lowest resistance. Conclusion: High frequency of β–lactamase in bacterial survey represents colonization of bacteria in staff hands; may be due to facility transmission β–lactamase plasmid genes in bacteria. We suggest better hand washing in hospitals and prescription of β–lactame antibiotics was based only on antibiogram results

  4. Real-Time Control of an Exoskeleton Hand Robot with Myoelectric Pattern Recognition.

    Science.gov (United States)

    Lu, Zhiyuan; Chen, Xiang; Zhang, Xu; Tong, Kay-Yu; Zhou, Ping

    2017-08-01

    Robot-assisted training provides an effective approach to neurological injury rehabilitation. To meet the challenge of hand rehabilitation after neurological injuries, this study presents an advanced myoelectric pattern recognition scheme for real-time intention-driven control of a hand exoskeleton. The developed scheme detects and recognizes user's intention of six different hand motions using four channels of surface electromyography (EMG) signals acquired from the forearm and hand muscles, and then drives the exoskeleton to assist the user accomplish the intended motion. The system was tested with eight neurologically intact subjects and two individuals with spinal cord injury (SCI). The overall control accuracy was [Formula: see text] for the neurologically intact subjects and [Formula: see text] for the SCI subjects. The total lag of the system was approximately 250[Formula: see text]ms including data acquisition, transmission and processing. One SCI subject also participated in training sessions in his second and third visits. Both the control accuracy and efficiency tended to improve. These results show great potential for applying the advanced myoelectric pattern recognition control of the wearable robotic hand system toward improving hand function after neurological injuries.

  5. Patterns in Cortical Connectivity for Determining Outcomes in Hand Function after Subcortical Stroke

    Science.gov (United States)

    Yin, Dazhi; Song, Fan; Xu, Dongrong; Peterson, Bradley S.; Sun, Limin; Men, Weiwei; Yan, Xu; Fan, Mingxia

    2012-01-01

    Background and Purpose Previous studies have noted changes in resting-state functional connectivity during motor recovery following stroke. However, these studies always uncover various patterns of motor recovery. Moreover, subgroups of stroke patients with different outcomes in hand function have rarely been studied. Materials and Methods We selected 24 patients who had a subcortical stroke in the left motor pathway and displayed only motor deficits. The patients were divided into two subgroups: completely paralyzed hands (CPH) (12 patients) and partially paralyzed hands (PPH) (12 patients). Twenty-four healthy controls (HC) were also recruited. We performed functional connectivity analysis in both the ipsilesional and contralesional primary motor cortex (M1) to explore the differences in the patterns between each pair of the three diagnostic groups. Results Compared with the HC, the PPH group displays reduced connectivity of both the ipsilesional and contralesional M1 with bilateral prefrontal gyrus and contralesional cerebellum posterior lobe. The connectivity of both the ipsilesional and contralesional M1 with contralateral primary sensorimotor cortex was reduced in the CPH group. Additionally, the connectivity of the ipsilesional M1 with contralesional postcentral gyrus, superior parietal lobule and ipsilesional inferior parietal lobule was reduced in the CPH group compared with the PPH group. Moreover, the connectivity of these regions was positively correlated with the Fugl-Meyer Assessment scores (hand+wrist) across all stroke patients. Conclusions Patterns in cortical connectivity may serve as a potential biomarker for the neural substratum associated with outcomes in hand function after subcortical stroke. PMID:23285171

  6. Patterns in cortical connectivity for determining outcomes in hand function after subcortical stroke.

    Directory of Open Access Journals (Sweden)

    Dazhi Yin

    Full Text Available BACKGROUND AND PURPOSE: Previous studies have noted changes in resting-state functional connectivity during motor recovery following stroke. However, these studies always uncover various patterns of motor recovery. Moreover, subgroups of stroke patients with different outcomes in hand function have rarely been studied. MATERIALS AND METHODS: We selected 24 patients who had a subcortical stroke in the left motor pathway and displayed only motor deficits. The patients were divided into two subgroups: completely paralyzed hands (CPH (12 patients and partially paralyzed hands (PPH (12 patients. Twenty-four healthy controls (HC were also recruited. We performed functional connectivity analysis in both the ipsilesional and contralesional primary motor cortex (M1 to explore the differences in the patterns between each pair of the three diagnostic groups. RESULTS: Compared with the HC, the PPH group displays reduced connectivity of both the ipsilesional and contralesional M1 with bilateral prefrontal gyrus and contralesional cerebellum posterior lobe. The connectivity of both the ipsilesional and contralesional M1 with contralateral primary sensorimotor cortex was reduced in the CPH group. Additionally, the connectivity of the ipsilesional M1 with contralesional postcentral gyrus, superior parietal lobule and ipsilesional inferior parietal lobule was reduced in the CPH group compared with the PPH group. Moreover, the connectivity of these regions was positively correlated with the Fugl-Meyer Assessment scores (hand+wrist across all stroke patients. CONCLUSIONS: Patterns in cortical connectivity may serve as a potential biomarker for the neural substratum associated with outcomes in hand function after subcortical stroke.

  7. Spatial patterns of cutaneous vibration during whole-hand haptic interactions

    Science.gov (United States)

    Hayward, Vincent; Visell, Yon

    2016-01-01

    We investigated the propagation patterns of cutaneous vibration in the hand during interactions with touched objects. Prior research has highlighted the importance of vibrotactile signals during haptic interactions, but little is known of how vibrations propagate throughout the hand. Furthermore, the extent to which the patterns of vibrations reflect the nature of the objects that are touched, and how they are touched, is unknown. Using an apparatus comprised of an array of accelerometers, we mapped and analyzed spatial distributions of vibrations propagating in the skin of the dorsal region of the hand during active touch, grasping, and manipulation tasks. We found these spatial patterns of vibration to vary systematically with touch interactions and determined that it is possible to use these data to decode the modes of interaction with touched objects. The observed vibration patterns evolved rapidly in time, peaking in intensity within a few milliseconds, fading within 20–30 ms, and yielding interaction-dependent distributions of energy in frequency bands that span the range of vibrotactile sensitivity. These results are consistent with findings in perception research that indicate that vibrotactile information distributed throughout the hand can transmit information regarding explored and manipulated objects. The results may further clarify the role of distributed sensory resources in the perceptual recovery of object attributes during active touch, may guide the development of approaches to robotic sensing, and could have implications for the rehabilitation of the upper extremity. PMID:27035957

  8. 基于直方图均衡化的手背静脉图像对比度增强%Contrast enhancement of hand vein images based on histogram equalization

    Institute of Scientific and Technical Information of China (English)

    蔡超峰; 任景英

    2013-01-01

    The hand vein image tends to be of low contrast, which affects the recognition accuracy of the whole hand vein recognition system. The effective area of the hand vein image was extracted firstly and then the Histogram Equalization (HE) algorithm and its improved versions were employed to enhance the contrast of the extracted hand vein image. The results-indicate that the Partially Overlapped Sub-block Histogram Equalization (POSHE) can enhance not only the overall contrast but also the detailed one. Meanwhile, its high efficiency is suitable to the hand vein image contrast enhancement.%手背静脉图像对比度往往较低,这将影响整个手背静脉识别系统的识别准确率.首先提取手背静脉图像中的有效区域,然后利用直方图均衡化(HE)及其各种改进算法对提取的手背静脉图像进行对比度增强处理.实验结果表明,子块部分重叠局部直方图均衡化算法(POSHE)不但能够增强图像的整体对比度,而且图像中细节与背景之间的对比度也得到了增强,同时该算法效率较高,适合于手背静脉图像的对比度增强处理.

  9. 手足背静脉逆行穿刺法在外科日常护理中的应用%Application of Retrograde Puncture of Hand and Foot Dorsal Vein in Surgical Nursing

    Institute of Scientific and Technical Information of China (English)

    桂蕾; 罗艳平

    2016-01-01

    目的::提高外科患者的静脉利用率和静脉穿刺成功率。方法:在手足背浅静脉上采用逆向穿刺法静脉输液。结果:静脉穿刺输液成功率明显提高。结论:患者如重症或手足背浅静脉由于长期输液破坏严重,建议采用逆向穿刺静脉输液。%Objective:To improve the utilization rate of venous puncture and the success rate of vein puncture in surgical patients.Methods:The method of reverse puncture was used in the vein infusion in the superficial vein of the hand and foot.Results:The success rate of intravenous infusion was significantly im-proved.Conclusion:The method of reverse puncture vein infusion is suggested if the sickness is intensive or superficial vein of hand and foot is seriously damaged due to long-term severe transfusion.

  10. Wheelchair propulsion: descriptive comparison of hemiplegic and two-hand patterns during selected activities.

    Science.gov (United States)

    Kirby, R L; Ethans, K D; Duggan, R E; Saunders-Green, L A; Lugar, J A; Harrison, E R

    1999-01-01

    Most manual wheelchair users with hemiplegia use both the unaffected arm and leg to propel their wheelchairs. The objective of this study was to compare the wheelchair propulsion of subjects using the hemiplegic pattern (one arm and one leg) with subjects using two hands. In a case-controlled study in a kinesiologic laboratory, nine wheelchair users who used the hemiplegic pattern were compared with nine matched controls who used the two-handed pattern. Participants were tested for propelling and stopping the wheelchair, forward and backward, on a level surface and on a 5 degree incline. Video recording was used to assess deviation from the midline, foot slippage, the number of propulsive cycles, and the propelling velocity. Also, on the 5 degree incline, we noted the need for support when unlocking the wheel locks, instances of grabbing the side rail, or rollback between propulsions. The participants using the hemiplegic pattern when propelling up the incline deviated more to the hemiparetic side (P wheelchair users who use the hemiplegic pattern experience more difficulties than those using two hands, some of which may be amenable to improvements in wheelchair prescription and training.

  11. Reverse split hand syndrome: Dissociated intrinsic hand muscle atrophy pattern in Hirayama disease/brachial monomelic amyotrophy.

    Science.gov (United States)

    Singh, Ravinder-Jeet; Preethish-Kumar, Veeramani; Polavarapu, Kiran; Vengalil, Seena; Prasad, Chandrajit; Nalini, Atchayaram

    2017-02-01

    Preferential involvement of C7, C8, T1 level anterior horn cells is a typical feature in Hirayama disease/brachial monomelic amyotrophy (BMMA). There are no clinico-electrophysiological studies to substantiate the peculiar pattern of muscle involvement. Thirty subjects, 10 in each group of BMMA, amyotrophic lateral sclerosis (ALS) and age-matched normal healthy subjects underwent detailed clinical and electrophysiological testing. Results showed that the mean age at evaluation for BMMA and ALS patients was 25.8 ± 3.8 and 51.8 ± 9.5 years, respectively; illness duration was 8.1 ± 5.7 years and 11.14 ± 2.85 months, respectively. Clinically, all BMMA patients had reverse of split hand (RSH) syndrome [abductor digiti minimi (ADM) affected more than abductor pollicis brevis (APB)], while 7/10 ALS patients had classical split hand syndrome (APB affected more than ADM). In BMMA, the compound muscle action potential (CMAP) of APB was preserved but reduced/absent in ADM compared to the ALS group which demonstrated reverse findings. APB/ADM ratio was >0.8 in the BMMA group (>1.4 in 80%), around 1.0 in normal controls (none had >1.4) and <0.8 in ALS (70% having values <0.6). In conclusion, RSH syndrome may provide valuable diagnostic clues to differentiate this relatively self-restricted disease from progressive degenerative disease like ALS.

  12. A novel approach to recognize hand movements via sEMG patterns.

    Science.gov (United States)

    Khezri, Mahdi; Jahed, Mehran

    2007-01-01

    Electromyogram signal (EMG) is an electrical manifestation of contractions of muscles. Surface EMG (sEMG) signal collected form surface of the skin has been used in diverse applications. One of its usages is exploiting it in a pattern recognition system which evaluates and synthesizes hand prosthesis movements. The ability of current prosthesis has been limited in simple opening and closing that decreases the efficacy of these devices in contrary to natural hand. In order to extend the ability and accuracy of prosthesis arm movements and performance, a novel approach for sEMG pattern recognizing system is proposed. In order to have a relevant comparison, present and recent research for designing similar systems was re-evaluated. In this study, we investigate time domain, time-frequency domain and combination of these as a representation of sEMG signal feature for accessing signal information. For pattern recognition of sEMG signals for various hand movements, two intelligent classifiers, namely artificial neural network (ANN) and fuzzy inference system (FIS) were utilized. The results indicate that using compound features with principle component analysis (PCA), dimensionality reduction technique and fuzzy technique for classifier produces the best performance for sEMG pattern recognition system.

  13. Spider Veins

    Science.gov (United States)

    ... How to Choose the Best Skin Care Products Spider Veins Treatment Options Learn more about treatment options ... severe venous disease. What you should know about spider veins The exact cause of spider veins is ...

  14. Dual window pattern recognition classifier for improved partial-hand prosthesis control

    Directory of Open Access Journals (Sweden)

    Eric Joseph Earley

    2016-02-01

    Full Text Available Although partial-hand amputees largely retain the ability to use their wrist, it is difficult to preserve wrist motion while using a myoelectric partial-hand prosthesis without severely impacting control performance. Electromyogram (EMG pattern recognition is a well-studied control method; however, EMG from wrist motion can obscure myoelectric finger control signals. Thus, to accommodate wrist motion and to provide high classification accuracy and minimize system latency, we developed a training protocol and a classifier that switches between long and short EMG analysis window lengths.Seventeen non-amputee and two partial-hand amputee subjects participated in a study to determine the effects of including EMG from different arm and hand locations during static and/or dynamic wrist motion in the classifier training data. We evaluated several real-time classification techniques to determine which control scheme yielded the highest performance in virtual real-time tasks using a 3-way ANOVA. We found significant interaction between analysis window length and the number of grasps available. Including static and dynamic wrist motion and intrinsic hand muscle EMG with extrinsic muscle EMG significantly reduced pattern recognition classification error by 35%. Classification delay or majority voting techniques significantly improved real-time task completion rates (17%, selection (23% and completion (11% times, and selection attempts (15% for non-amputee subjects, and the dual window classifier significantly reduced the time (8% and average number of attempts required to complete grasp selections (14% made in various wrist positions. Amputee subjects demonstrated improved task timeout rates, and made fewer grasp selection attempts, with classification delay or majority voting techniques.Thus, the proposed techniques show promise for improving control of partial-hand prostheses and more effectively restoring function to individuals using these devices.

  15. Vein Texture Extraction Using the Multiscale Second-Order Differential Model

    Directory of Open Access Journals (Sweden)

    Xiong Xinyan

    2013-07-01

    Full Text Available In order to analyze the back of hand vein pattern rapidly and effectively, a novel approach based on multi-scale second-order differential model is proposed to extract the vein texture from vein samples directly, which is made up of two section: one is the foundation of local second-order differential model of vein texture(VLSDM, the other is texture extraction based on the multi-scale VLSDM. This paper analyzes the vein extraction using the multi-scale VLSDM and handles the filter response using the method of multi-scale analyzed noise filtered. This new algorithm has achieved good results for the vein texture, which is fuzzy, uneven distributed and cross-adhesion. Additionally this method keeps the original form of local shape and achieves orientation and scale information of the vein texture. The experiment result getting from this new method has also compared with another method and shown its outstanding performance.  

  16. 用于手背静脉注射的图像自动识别与标注%Image Automatic Recognition and Mark of Hand Vein Injection Parts

    Institute of Scientific and Technical Information of China (English)

    张珣; 郭永洪; 李刚; 何金龙

    2015-01-01

    For the situation that there was little study on automatic recognition which was suitable for intravenous injection directly, we present a method that identifies the vein automatically. It analyzes the features of vein puncture and conditions suitable for intravenous injection. On the basis of getting global hand vein images under the near-infrared light, the improved region growing method is used to extract and analyze each of the vein. And template matching method is used to identify the most suitable part for vein puncturing. The test results show that the method can successfully identify and label the vein parts which are suitable for vein injection.%针对医疗领域的手背静脉识别研究甚少的问题,提出一种用于静脉注射的手背静脉自动识别的方法。分析了静脉穿刺的特点以及适合注射的静脉条件,在近红外光下获得全局手背静脉图像的基础上,首先对图像进行预处理获得完整的细化图像,再利用改进的区域生长法分别对每条静脉进行提取和分析,最后用模板匹配法识别选择最适合穿刺的静脉部分。实验结果表明:该方法能够实现对适合注射的静脉部分进行自动识别与标注。

  17. Phase-field modeling of microstructural pattern formation in alloys and geological veins

    OpenAIRE

    Ankit, Kumar

    2016-01-01

    With the advent of high performance computing, the application areas of the phase-field method, traditionally used to numerically model the phase transformation in metals and alloys, have now spanned into geoscience. A systematic investigation of the two distinct scientific problems in consideration suggest a strong influence of interfacial energy on the natural and induced pattern formation in diffusion-controlled regime.

  18. Pattern Differences of Small Hand Muscle Atrophy in Amyotrophic Lateral Sclerosis and Mimic Disorders

    Science.gov (United States)

    Fang, Jia; Liu, Ming-Sheng; Guan, Yu-Zhou; Du, Hua; Li, Ben-Hong; Cui, Bo; Ding, Qing-Yun; Cui, Li-Ying

    2016-01-01

    Background: Amyotrophic lateral sclerosis (ALS) and some mimic disorders, such as distal-type cervical spondylotic amyotrophy (CSA), Hirayama disease (HD), and spinobulbar muscular atrophy (SBMA) may present with intrinsic hand muscle atrophy. This study aimed to investigate different patterns of small hand muscle involvement in ALS and some mimic disorders. Methods: We compared the abductor digiti minimi/abductor pollicis brevis (ADM/APB) compound muscle action potential (CMAP) ratios between 200 ALS patients, 95 patients with distal-type CSA, 88 HD patients, 43 SBMA patients, and 150 normal controls. Results: The ADM/APB CMAP amplitude ratio was significantly higher in the ALS patients (P SBMA patients was similar to that of the normal controls (P = 0.862). An absent APB CMAP and an abnormally high ADM/APB CMAP amplitude ratio (≥4.5) were observed exclusively in the ALS patients. Conclusions: The different patterns of small hand muscle atrophy between the ALS patients and the patients with mimic disorders presumably reflect distinct pathophysiological mechanisms underlying different disorders, and may aid in distinguishing between ALS and mimic disorders. PMID:26996473

  19. Identity recognition based on multi feature sparse representation of dorsal hand vein image%基于手背静脉图像多特征稀疏表示的身份识别

    Institute of Scientific and Technical Information of China (English)

    贾旭; 崔建江; 薛定宇; 刘晶

    2011-01-01

    In order to recognize individual identity accurately, the global and local features of acquired dorsal hand vein image are extracted, and a vein recognition algorithm based on the sparse representation of those features is proposed. In the proposed algorithm all vein objects in vein sample database should be determined firstly, and every dorsal hand vein is acquired in different light intensities. Moreover, all the acquired vein images are compressed and rotated properly, and all the transformed images could be taken as the samples of the vein objects. Secondly, the global and local features of all the vein object samples are extracted respectively, and the global and local features of unknown vein image are represented sparsely through solving the minimum 1 -norms of eigenvector coefficients. Finally , the results of sparse representation are fused, and the vein recognition process is completed. In the experiment, the vein sample database was established through acquiring 200 vein objects in three light intensities and shrinking and rotating the images; recognition experiment shows that the recognition rate of the proposed algorithm has exceeded 98% , and the algorithm has good robustness for multiple uncooperative factors and good practical value.%为了准确地对人的身份进行识别,提出了一种对采集静脉图像的全局特征和局部特征进行稀疏表示的识别算法.该算法首先应确定静脉样本库中所有的静脉对象,并在不同光强下对每一手背静脉进行采集,此外将采集图像进行适当压缩与旋转,并将变换后的所有图像作为库中描述该静脉对象的样本;其次,分别提取该静脉对象所有样本的全局特征与局部特征,并通过求解每一特征系数向量的最小1范数,对未知静脉图像的全局与局部特征进行稀疏表示;最后,融合稀疏表示结果,完成静脉识别的过程.通过在3种光强下对200个人的手背静脉进行采集,并经过图像压缩

  20. Comparison of margin discrepancy of complete gold crowns fabricated using printed, milled, and conventional hand-waxed patterns.

    Science.gov (United States)

    Munoz, Sergio; Ramos, Van; Dickinson, Douglas P

    2017-07-01

    The recent application of printing for the fabrication of dental restorations has not been compared and evaluated for margin discrepancy (margin fit) with restorations fabricated using milling and conventional hand-waxing techniques. The purpose of this in vitro study was to evaluate and compare margin discrepancy of complete gold crowns (CGCs) fabricated from printed, milled, and conventional hand-waxed patterns. Thirty crown patterns were produced by each of 3 different methods: printed by ProJet DP 3000, milled by LAVA CNC 500, and hand waxed, then invested and cast into CGCs. Each crown was evaluated at 10 positions around the margin on the corresponding epoxy die under ×50 light microscopy to determine the mean and maximum margin discrepancy. Measurements were made using a micrometer positioning stage. The results were compared by ANOVA (α=.05). Milled and hand-waxed patterns were not statistically different from each other (P>.05), while printed patterns produced significantly higher mean and maximum margin discrepancy than milled and hand-waxed patterns (Ppatterns were not significantly different from each other. The ProJet DP 3000 printed patterns were significantly different from LAVA CNC 500 milled and hand-waxed patterns, with an overall poorer result. Fabricating CGCs from printed patterns produced a significantly higher number of crowns with unacceptable margin discrepancy (>120 μm). Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

  1. Cyclical Patterns of Hand, Foot and Mouth Disease Caused by Enterovirus A71 in Malaysia.

    OpenAIRE

    Nmn NikNadia; I-Ching Sam; Sanjay Rampal; Wmz WanNorAmalina; Ghazali NurAtifah; Khebir Verasahib; Chia Ching Ong; MohdAidinniza MohdAdib; Yoke Fun Chan

    2016-01-01

    Enterovirus A71 (EV-A71) is an important emerging pathogen causing large epidemics of hand, foot and mouth disease (HFMD) in children. In Malaysia, since the first EV-A71 epidemic in 1997, recurrent cyclical epidemics have occurred every 2–3 years for reasons that remain unclear. We hypothesize that this cyclical pattern is due to changes in population immunity in children (measured as seroprevalence). Neutralizing antibody titers against EV-A71 were measured in 2,141 residual serum samples c...

  2. A Study of Hand Back Skin Texture Patterns for Personal Identification and Gender Classification

    Directory of Open Access Journals (Sweden)

    Jin Xie

    2012-06-01

    Full Text Available Human hand back skin texture (HBST is often consistent for a person and distinctive from person to person. In this paper, we study the HBST pattern recognition problem with applications to personal identification and gender classification. A specially designed system is developed to capture HBST images, and an HBST image database was established, which consists of 1,920 images from 80 persons (160 hands. An efficient texton learning based method is then presented to classify the HBST patterns. First, textons are learned in the space of filter bank responses from a set of training images using the -minimization based sparse representation (SR technique. Then, under the SR framework, we represent the feature vector at each pixel over the learned dictionary to construct a representation coefficient histogram. Finally, the coefficient histogram is used as skin texture feature for classification. Experiments on personal identification and gender classification are performed by using the established HBST database. The results show that HBST can be used to assist human identification and gender classification.

  3. Pattern Differences of Small Hand Muscle Atrophy in Amyotrophic Lateral Sclerosis and Mimic Disorders

    Institute of Scientific and Technical Information of China (English)

    Jia Fang; Ming-Sheng Liu; Yu-Zhou Guan; Hua Du; Ben-Hong Li; Bo Cui; Qing-Yun Ding

    2016-01-01

    Background:Amyotrophic lateral sclerosis (ALS) and some mimic disorders,such as distal-type cervical spondylotic amyotrophy (CSA),Hirayama disease (HD),and spinobulbar muscular atrophy (SBMA) may present with intrinsic hand muscle atrophy.This study aimed to investigate different patterns of small hand muscle involvement in ALS and some mimic disorders.Methods:We compared the abductor digiti minimi/abductor pollicis brevis (ADM/APB) compound muscle action potential (CMAP) ratios between 200 ALS patients,95 patients with distal-type CSA,88 HD patients,43 SBMA patients,and 150 normal controls.Results:The ADM/APB CMAP amplitude ratio was significantly higher in the ALS patients (P < 0.001) than that in the normal controls.The ADM/APB CMAP amplitude ratio was significantly reduced in the patients with distal-type CSA (P < 0.001) and the HD patients (P < 0.001) compared with that in the normal controls.The patients with distal-type CSA had significantly lower APB CMAP amplitude than the HD patients (P =0.004).The ADM/APB CMAP amplitude ratio was significantly lower in the HD patients (P < 0.001) than that in the patients with distal-type CSA.The ADM/APB CMAP amplitude ratio of the SBMA patients was similar to that of the normal controls (P =0.862).An absent APB CMAP and an abnormally high ADM/APB CMAP amplitude ratio (>4.5) were observed exclusively in the ALS patients.Conclusions:The different patterns of small hand muscle atrophy between the ALS patients and the patients with mimic disorders presumably reflect distinct pathophysiological mechanisms underlying different disorders,and may aid in distinguishing between ALS and mimic disorders.

  4. Clinical Effect Observation of Two Kinds of Puncture Methods for the Shallow Vein of the Back of Hand%手背浅静脉两种穿刺方法的临床效果观察

    Institute of Scientific and Technical Information of China (English)

    杨玉芹

    2015-01-01

    Objective Explore the superficial vein pancture method of painless or minor aches and pains,improve the success rate of vein puncture,and improve the nursing quality.Methods Use of external vein respectively,the needke Angle is less than 30 degrees and the inside of the hand vein into the Angle is greater than 30 degrees is greater than 30 degrees of two kinds of needle puncture method,for 1120 patients with community outpatient infusion venipuncture,observe the subjects"pain response and injury of hand skin hole.Results The experimental method of in the external vein,the meedle Angle is less than 30 degrees.and cor elation method,the inside of the vein,the needle Angle greater than 30 degrees,compared with the pain degree of puncture success rate have dif erences. Conclusion By the method of experiment,less damage to the skin and blood vessel wal s,patients can reduce pain.%目的探讨手背浅静脉穿刺的无痛或轻微疼痛的方法,提高静脉穿刺成功率,提高护理质量。方法分别采用手背中外部区静脉,针尖进针角度30º的两种穿刺法为1120例社区门诊输液患者进行静脉穿刺。观察受试者的疼痛反应及手背表皮针孔处的损伤变化。结果实验法(选择手背中外部区静脉,进针角度30º)相比疼痛程度、穿刺成功率较有差异。结论采用实验法对皮肤及血管壁的损伤较小,可提高穿刺成功率,减轻患者疼痛。

  5. A data mining technique for discovering distinct patterns of hand signs: implications in user training and computer interface design.

    Science.gov (United States)

    Ye, Nong; Li, Xiangyang; Farley, Toni

    2003-01-15

    Hand signs are considered as one of the important ways to enter information into computers for certain tasks. Computers receive sensor data of hand signs for recognition. When using hand signs as computer inputs, we need to (1) train computer users in the sign language so that their hand signs can be easily recognized by computers, and (2) design the computer interface to avoid the use of confusing signs for improving user input performance and user satisfaction. For user training and computer interface design, it is important to have a knowledge of which signs can be easily recognized by computers and which signs are not distinguishable by computers. This paper presents a data mining technique to discover distinct patterns of hand signs from sensor data. Based on these patterns, we derive a group of indistinguishable signs by computers. Such information can in turn assist in user training and computer interface design.

  6. 经深静脉和外周静脉泵入腺苷三磷酸测量血流储备分数的比较研究%Comparative study of fractional lfow reserve measurement by intravenous ATP infusion through ;femoral veins and hand dosal veins

    Institute of Scientific and Technical Information of China (English)

    刘晶晶; 曲涛; 张萌; 靳维华; 高炬; 王斌

    2014-01-01

    Objective To compare and evaluate fractional flow reserve (FFR) by intravenous infusion of adenosine 5’-triphosphate (ATP) through femoral veins and hand dosal veins. To find the feasibility of measuring FFR through ATP infusion at hand dosal veins. Methods A total of 27 patients receiving coronary angiography (CAG) were enrolled. FFR was measured by intravenous injection of ATP through femoral veins and hand dosal veins separately in 31 stenosed coronary arteries. Results A linear correlation between ATP infusion measuring FFR through femoral and hand dosal veins was observed. Heart rates, PR intervals and side effects were of no difference between the 2 routes of ATP infusion (P=0.79, P=0.56, P=0.85). It indicated that ATP infusion[160μg/(kg·min)]measuring FFR through hand dosal veins was compatable to which measuring FFR though femoral veins (y=0.945x+0.0043, R2=0.904, P=0.001). Compared with ATP infusion by femoral vein[from (53.7±15.8) s to (58.2±11.6) s], the time to FFR by infusion ATP measurement by hand dosal veins was longer[(48.7±17.9) s, P=0.015]. Conclusions The FFR measurement through ATP infusion at hand dosal veins has similar results with the FFR measured by femoral veins ATP infusion.%目的:经外周静脉(手背静脉)泵入腺苷三磷酸(ATP)的方法测定血流储备分数(FFR),并通过与标准的测量方法[深静脉(股静脉)泵入ATP]测量FFR的对比研究,评价经外周静脉泵入不同剂量ATP测定FFR的可行性。探讨经手背静脉泵入ATP测定是否能够准确测量FFR。方法针对航天中心医院27例患者冠状动脉造影术中的31条冠状动脉病变血管,进行外周静脉和股静脉冠状动脉造影术及两种途径测定的FFR数值测量与数据分析。结果经手背静脉泵入ATP[≥140μg/(kg · min)]测量的4组FFR值与标准方法测量FFR值的一致性、相关性。两种途径注射ATP后心率、PR间期、不良反应发生率比较,差异无统

  7. Neuromuscular trunk activation patterns in back pain patients during one-handed lifting

    Science.gov (United States)

    Mueller, Juliane; Engel, Tilman; Kopinski, Stephan; Mayer, Frank; Mueller, Steffen

    2017-01-01

    AIM To analyze neuromuscular activity patterns of the trunk in healthy controls (H) and back pain patients (BPP) during one-handed lifting of light to heavy loads. METHODS After assessment of back pain (graded chronic pain scale according to von Korff) all subjects (n = 43) performed a warm-up (treadmill walking). Next, subjects were instructed to lift 3 × a 20 kg weight placed in front of them (with both hand) onto a table (height: 0.75 m). Subsequently, all subjects lifted with one hand (left-side, 3 repetitions) a weight of 1 kg (light), 10 kg (middle) and 20 kg (heavy) in random order from the ground up onto the table left of them. Trunk muscle activity was assessed with a 12-lead EMG (6 ventral/6 dorsal muscles; 4000 Hz). EMG-RMS (%) was averaged over the 3 repetitions and analyzed for the whole one-handed lifting cycle, then normalized to RMS of the two-handed lifting. Additionally, the mean (normalized) EMG-RMS of four trunk areas [right/left ventral area (VR/VL); right/left dorsal area (DR/DL)] was calculated. Data were analyzed descriptively (mean ± SD) followed by student’s t-test comparing H and BPP (α = 0.05). With respect to the unequal distribution of subjects in H and BPP, a matched-group analysis was conducted. Seven healthy controls were gender- and age-matched (group Hmatched) to the 7 BPP. In addition, task failure was calculated and compared between H/Hmatched vs BPP using χ2. RESULTS Seven subjects (3m/4f; 32 ± 7 years; 171 ± 7 cm; 65 ± 11 kg) were assigned to BPP (pain grade ≥ 2) and 36 (13m/23f; 28 ± 8 years; 174 ± 10 cm; 71 ± 12 kg) to H (pain grade ≤ 1). H and BPP did not differ significantly in anthropometrics (P > 0.05). All subjects were able to lift the light and middle loads, but 57% of BPP and 22% of H were not able to lift the heavy load (all women). χ2 analysis revealed statistically significant differences in task failure between H vs BPP (P = 0.03). EMG-RMS ranged from 33% ± 10%/30% ± 9% (DL, 1 kg) to 356%

  8. 基于小波分解和K2DPCA-2DLDA的手背静脉识别%Dorsal hand vein recognition based on wavelet decomposition and K2DPCA-2DLDA

    Institute of Scientific and Technical Information of China (English)

    吕岑; 程诚; 赵东霞

    2011-01-01

    提出了一种基于小波分解和二维主成分分析-二维线性判别式分析(K2DPCA-2DLDA)的手背静脉识别方法,选用db4小波基对原图进行小波分解.对其低频子图进行K2DPCA映射获得低维空间特征,通过对此低维空间特征进行2DLDA变换得到最终特征表达,利用最近邻法则进行了分类.实验结果表明,该方法能提高手背静脉识别率,有效减少识别时间.%Dorsal hand vein recognition based on wavelet decomposition and K2DPCA-2DLDA was proposed in this paper, and db4 wavelet was used to decompose the original image.K2DPCA transformation was used for the sub-image of low frequency to obtain low dimensional space characteristics.Then, 2DLDA transformation was used to further reduce the dimension for obtaining the final feature expression.Finally, the features were classified according to the nearest neighbor classification rule.The experimental results show that the method can improve the hand dorsal vein recognition rate and reduce the recognition time effectively.

  9. Cyclical Patterns of Hand, Foot and Mouth Disease Caused by Enterovirus A71 in Malaysia.

    Directory of Open Access Journals (Sweden)

    Nmn NikNadia

    2016-03-01

    Full Text Available Enterovirus A71 (EV-A71 is an important emerging pathogen causing large epidemics of hand, foot and mouth disease (HFMD in children. In Malaysia, since the first EV-A71 epidemic in 1997, recurrent cyclical epidemics have occurred every 2-3 years for reasons that remain unclear. We hypothesize that this cyclical pattern is due to changes in population immunity in children (measured as seroprevalence. Neutralizing antibody titers against EV-A71 were measured in 2,141 residual serum samples collected from children ≤12 years old between 1995 and 2012 to determine the seroprevalence of EV-A71. Reported national HFMD incidence was highest in children <2 years, and decreased with age; in support of this, EV-A71 seroprevalence was significantly associated with age, indicating greater susceptibility in younger children. EV-A71 epidemics are also characterized by peaks of increased genetic diversity, often with genotype changes. Cross-sectional time series analysis was used to model the association between EV-A71 epidemic periods and EV-A71 seroprevalence adjusting for age and climatic variables (temperature, rainfall, rain days and ultraviolet radiance. A 10% increase in absolute monthly EV-A71 seroprevalence was associated with a 45% higher odds of an epidemic (adjusted odds ratio, aOR1.45; 95% CI 1.24-1.69; P<0.001. Every 10% decrease in seroprevalence between preceding and current months was associated with a 16% higher odds of an epidemic (aOR = 1.16; CI 1.01-1.34 P<0.034. In summary, the 2-3 year cyclical pattern of EV-A71 epidemics in Malaysia is mainly due to the fall of population immunity accompanying the accumulation of susceptible children between epidemics. This study will impact the future planning, timing and target populations for vaccine programs.

  10. Heterogeneity in hand veins responses to acetylcholine is not associated with polymorphisms in the G-protein beta3-subunit (C825T) and endothelial nitric oxide synthase (G894T) genes but with serum low density lipoprotein cholesterol.

    Science.gov (United States)

    Grossmann, M; Dobrev, D; Siffert, W; Kirch, W

    2001-06-01

    Vascular responses to acetylcholine (ACh) are notoriously variable, the reason for this phenomenon is unknown. We tested the hypothesis that the variability in venous response to acetylcholine may be associated with two recently identified genetic polymorphisms for proteins involved in the signal transduction pathway, i.e. the G-protein beta3-subunit (GNB3) and endothelial nitric oxide synthase (eNOS). The dorsal hand vein technique was used in 37 healthy subjects. Hand veins were preconstricted with the alpha1-adrenoceptor agonist phenylephrine and the venodilator response to local ACh infusion was measured with and without comedication of acetylsalicylic acid or co-infusion of N(G)-monomethyl-L-arginine (L-NMMA). In addition, all subjects received routine laboratory tests and 26 of them were genotyped for the C825T polymorphism of the GNB3 gene and for the G894T polymorphism of the eNOS gene. A striking variability in venous response to ACh was found with dilation observed in the low ACh concentration range and reduced dilation or even constriction at high concentrations. ACh-induced venodilation was mediated by muscarinic receptors and abolished in the presence of both acetylsalicylic acid and L-NMMA suggesting dependence on endothelium. We did not find any association of the variability in ACh response with GNB3 or eNOS allele status. On the other hand, a significant positive correlation between ACh responsiveness and low density lipoprotein-cholesterol status was detected. Two recently discovered gene polymorphisms are not responsible for the profound heterogeneity in venodilator response to ACh. Surprisingly, this variability appears to relate to the lipid status of the subjects. The exact nature of this new finding requires further study.

  11. The hand in Smith-Magenis syndrome (deletion 17p11.2): evaluation by metacarpophalangeal pattern profile analysis

    Energy Technology Data Exchange (ETDEWEB)

    Schlesinger, Alan E. [Department of Diagnostic Imaging, Texas Children' s Hospital, 6621 Fannin Street, MC2-2521, Houston, TX 77030 (United States); Potocki, Lorraine [Department of Molecular and Human Genetics, Baylor College of Medicine and Texas Children' s Hospital, 6621 Fannin Street, CC-1560, Houston, TX 77030 (United States); Poznanski, Andrew K. [Department of Radiology, Children' s Memorial Hospital and Northwestern University School of Medicine, 2300 Children' s Plaza, Chicago, IL 60614 (United States); Lupski, James R. [Department of Molecular and Human Genetics, Baylor College of Medicine and Texas Children' s Hospital, 1 Baylor Plaza, Room 604B, Houston, TX 77030 (United States)

    2003-03-01

    Brachydactyly has been described on physical examination in patients with Smith-Magenis syndrome (SMS). Metacarpophalangeal pattern profile analysis (MCPPPA), a method of graphic depiction of the relative size of the bones of the hand, has been used to objectively evaluate radiographs of the hand in patients with SMS in two small series: a single case and a study of four patients. This technique has confirmed brachydactyly and has suggested conflicting MCPPPA results. The purpose of our study was to evaluate the hand by MCPPPA in a large series of patients with SMS.Patients and methods We measured the bones of the hand and performed MCPPPA in 29 confirmed cases of SMS. Our results in 29 patients demonstrated a different MCPPPA in patients with SMS than previously reported. The analysis confirmed brachydactyly and the previously described trend of more pronounced shortening of the distal bones relative to the more proximal bones, but also demonstrated a previously undescribed pattern: relative enlargement of the proximal phalanx of the thumb and middle phalanx of the fifth finger. However, statistical analysis suggested that the pattern was not highly characteristic. MCPPPA of 29 patients with SMS demonstrates a pattern different than previously reported, but not highly characteristic. (orig.)

  12. Hand injuries from tools in domestic and leisure settings: relative incidence and patterns of initial management.

    Science.gov (United States)

    Williams, S T B; Power, D

    2011-06-01

    A search of the UK Department of Trade and Industry's Home and Leisure Accident database found 16,003 emergency hospital attendances in 2000-2002 following accidents with tools. The hand was the site of injury in 9535 cases (60%). The tool most commonly involved was a Stanley knife, causing as many hand injuries (21%) as all power tools combined. The power tools most frequently causing hand injury were circular saws (28% of power tool injuries), hedge trimmers (21%) and electric drills (17%). Compared to injuries from manual tools, power tool hand injuries were more than twice as likely to be referred to specialists and three times more likely to be admitted to hospital. Specialist referral/admission most commonly occurred following hand injury from mowers (51% admitted/referred), routers (50%) and circular saws (48%). The rate for manual blade injuries was 14%. Missed diagnoses following manual blade injuries may stem from comparatively low rates of specialist assessment.

  13. Computational intelligence in multi-feature visual pattern recognition hand posture and face recognition using biologically inspired approaches

    CERN Document Server

    Pisharady, Pramod Kumar; Poh, Loh Ai

    2014-01-01

    This book presents a collection of computational intelligence algorithms that addresses issues in visual pattern recognition such as high computational complexity, abundance of pattern features, sensitivity to size and shape variations and poor performance against complex backgrounds. The book has 3 parts. Part 1 describes various research issues in the field with a survey of the related literature. Part 2 presents computational intelligence based algorithms for feature selection and classification. The algorithms are discriminative and fast. The main application area considered is hand posture recognition. The book also discusses utility of these algorithms in other visual as well as non-visual pattern recognition tasks including face recognition, general object recognition and cancer / tumor classification. Part 3 presents biologically inspired algorithms for feature extraction. The visual cortex model based features discussed have invariance with respect to appearance and size of the hand, and provide good...

  14. Hand preference patterns in expert basketball players: interrelations between basketball-specific and everyday life behavior.

    Science.gov (United States)

    Stöckel, Tino; Vater, Christian

    2014-12-01

    In the present study we examined the interrelation of everyday life handedness and hand preference in basketball, as an area of expertise that requires individuals being proficient with both their non-dominant and dominant hand. A secondary aim was to elucidate the link between basketball-specific practice, hand preference in basketball and everyday life handedness. Therefore, 176 expert basketball players self-reported their hand preference for activities of daily living and for basketball-specific behavior as well as details about their basketball-specific history via questionnaire. We found that compared to the general population the one-hand bias was significantly reduced for both everyday life and basketball-specific hand preference (i.e., a higher prevalence of mixed-handed individuals), and that both concepts were significantly related. Moreover, only preference scores for lay-up and dribbling skills were significantly related to measures of basketball-specific practice. Consequently, training-induced modulations of lateral preference seem to be very specific to only a few basketball-specific skills, and do not generalize to other skills within the domain of basketball nor do they extend into everyday life handedness. The results are discussed in terms of their relevance regarding theories of handedness and their practical implications for the sport of basketball.

  15. 手足背静脉逆行穿刺在化疗病人中的应用%The effect of retrograde paracentesis of hand and foot dorsal vein on chemotherapy patients

    Institute of Scientific and Technical Information of China (English)

    王琼; 卓少君; 肖莹; 杨郁华

    2010-01-01

    目的 探讨手足背静脉逆行穿刺在化疗病人中的实施效果.方法 采用对照法,将120例进行静脉化疗的肿瘤病人,随机分成两组,对照组60例采用顺行静脉穿刺,观察组60例采用逆行静脉穿刺,比较两组的穿刺成功率、血管通畅情况、病人疼痛度等.结果 观察组在穿刺的成功率及输液通畅程度方面明显优于对照组(P<0.05);且观察组静脉炎的发生率及穿刺时病人的疼痛程度明显低于对照组(P<0.05).结论 逆行静脉穿刺可提高肿瘤病人穿刺成功率,减少静脉炎的发生率,减少病人穿刺时疼痛的感觉,一定程度上减轻化疗病人的痛苦.%Objective To study the effect of retrograde paracentesis of hand and foot dorsal vein on chemotherapy patients. Methods A total of 120 tumor patients under vein chemotherapy were divided into two groups at random. The control group was given antegrade paracentesis, while the observation group was given retrograde paracentesis. The differences of the achievement ratio, the influence on blood vessel and the pain in patients of these two groups were compared. Results The patients in observation group had higher achievement ratio in paracentesis operation and transfusion became easier too ( P < 0.05 ) . Moreover, patients in observation group had a lower incidence rate of being infecting with phlebitis and they had obviously mild pain in paracentesis operation (P < 0. 05) . Conclusions Retrograde vein paracentesis have the advantages of elevating the achievement ratio, decreasing the incidence rate of being infecting with phlebitis and reducing the pain in paracentesis operation, which could relieve pain for tumor patients to some extent[ Key words] Chemotherapy patients;Retrograde vein paracentesis

  16. 基于UDCT和三角形测量特征融合的手背静脉识别%Dorsal Hand Vein Recognition Based on the Feature Fusion of UDCT Phase Feature and Triangulation

    Institute of Scientific and Technical Information of China (English)

    魏上清; 顾晓东

    2013-01-01

    A new approach to palm-dorsal vein recognition based on the feature fusion is presented in this paper.After palm-dorsal image preprocessing and ROI (Region Of Interest) extraction,we use UDCT (Uniform Discrete Curvelet Transform) of the Curvelet Transform on ROI,and encode the Curvelet coefficients phase variance,and evaluate the Chi-square distance of coding histogram for vein recognition.When the distance between and threshold is large,we get the recognition result.Otherwise,this paper detects the skeleton of the hand vein,and uses the ending point and the crossing point of the extracted vein skeleton as the feature point,then measure the triangle side by the Triangulation algorithm.At last,this paper calculates the matching distance by the weighted average method.This approach improves recognition ratio and avoids the cost time noise problem increase sharply.%提出了一种基于特征融合的手背静脉识别算法,首先对手背静脉图像感兴趣区域进行预处理,然后采用均衡离散曲率波变换对感兴趣区域进行变换,接着对变换系数进行相位编码,并计算编码统计直方图的卡方距离,当此距离与阈值相差较大时,得到识别结果;否则,对预处理后的图像提取静脉骨架,确定相关的特征点,通过三角测量法来计算匹配距离,对和采用加权平均法来获得最终的识别结果.该方法在识别时间没有明显增加的情况下,而识别的效果却得到了提高.

  17. Varicose vein - noninvasive treatment

    Science.gov (United States)

    Sclerotherapy; Laser therapy - varicose veins; Radiofrequency vein ablation; Endovenous thermal ablation; Ambulatory phlebectomy; Transilluminated power phlebotomy; Endovenous laser ablation; Varicose vein ...

  18. Augmented reality based real-time subcutaneous vein imaging system

    OpenAIRE

    Ai, Danni; Yang, Jian; Fan, Jingfan; Zhao, Yitian; Song, Xianzheng; Shen, Jianbing; Shao, Ling; Wang, Yongtian

    2016-01-01

    A novel 3D reconstruction and fast imaging system for subcutaneous veins by augmented reality is presented. The study was performed to reduce the failure rate and time required in intravenous injection by providing augmented vein structures that back-project superimposed veins on the skin surface of the hand. Images of the subcutaneous vein are captured by two industrial cameras with extra reflective near-infrared lights. The veins are then segmented by a multiple-feature clustering method. V...

  19. In the palm of your hand : prevalence, disease patterns and natural course of Dupuytren Disease

    NARCIS (Netherlands)

    Lanting, Rosanne

    2014-01-01

    De ziekte van Dupuytren is een aandoening van de bindweefselplaat in de hand en vingers, waarbij knobbels en strengen in de handpalm voorkomen. Dit kan leiden tot een kromstand van de vingers en op dit moment zijn er geen mogelijkheden om de ziekte van Dupuytren te genezen of te voorkomen. Met ons

  20. In the palm of your hand : prevalence, disease patterns and natural course of Dupuytren Disease

    NARCIS (Netherlands)

    Lanting, Rosanne

    2014-01-01

    De ziekte van Dupuytren is een aandoening van de bindweefselplaat in de hand en vingers, waarbij knobbels en strengen in de handpalm voorkomen. Dit kan leiden tot een kromstand van de vingers en op dit moment zijn er geen mogelijkheden om de ziekte van Dupuytren te genezen of te voorkomen. Met ons o

  1. Leaf vein segmentation using Odd Gabor filters and morphological operations

    OpenAIRE

    Katyal, Vini; Aviral

    2012-01-01

    Leaf vein forms the basis of leaf characterization and classification. Different species have different leaf vein patterns. It is seen that leaf vein segmentation will help in maintaining a record of all the leaves according to their specific pattern of veins thus provide an effective way to retrieve and store information regarding various plant species in database as well as provide an effective means to characterize plants on the basis of leaf vein structure which is unique for every specie...

  2. Varicose vein stripping

    Science.gov (United States)

    ... vein stripping; Venous reflux - vein stripping; Venous ulcer - veins Images Circulatory system References American Family Physician. Management of varicose veins. www.aafp.org/afp/2008/1201/p1289.html . ...

  3. Deep Vein Thrombosis

    Science.gov (United States)

    Deep vein thrombosis, or DVT, is a blood clot that forms in a vein deep in the body. Most deep vein ... the condition is called thrombophlebitis. A deep vein thrombosis can break loose and cause a serious problem ...

  4. Vein matching using artificial neural network in vein authentication systems

    Science.gov (United States)

    Noori Hoshyar, Azadeh; Sulaiman, Riza

    2011-10-01

    Personal identification technology as security systems is developing rapidly. Traditional authentication modes like key; password; card are not safe enough because they could be stolen or easily forgotten. Biometric as developed technology has been applied to a wide range of systems. According to different researchers, vein biometric is a good candidate among other biometric traits such as fingerprint, hand geometry, voice, DNA and etc for authentication systems. Vein authentication systems can be designed by different methodologies. All the methodologies consist of matching stage which is too important for final verification of the system. Neural Network is an effective methodology for matching and recognizing individuals in authentication systems. Therefore, this paper explains and implements the Neural Network methodology for finger vein authentication system. Neural Network is trained in Matlab to match the vein features of authentication system. The Network simulation shows the quality of matching as 95% which is a good performance for authentication system matching.

  5. Prevalence and pattern of growth abnormalities in children with extrahepatic portal vein obstruction: Response to shunt surgery

    Directory of Open Access Journals (Sweden)

    Toufeeq Ahmad Mir

    2016-01-01

    Full Text Available Objective: Growth retardation is common in children with extrahepatic portal vein obstruction (EHPVO and growth hormone (GH resistance may play a dominant role. The aim of this study was to ascertain growth parameters and growth-related hormones in children with EHPVO, comparing with controls and to study the response of shunt surgery on growth parameters. Materials and Methods: The auxological and growth-related hormone profile (GH; insulin-like growth factor binding protein-3 [IGFBP-3] and IGF-1 of thirty children with EHPVO were compared with controls. The effect of shunt surgery on growth parameters in 12 children was also studied. Results: The mean height standard deviation score (HSDS of cases (−1.797 ± 1.146 was significantly lower than that of controls (−0.036 ± 0.796; the mean weight SDS of cases (−1.258 ± 0.743 was also lower than that of controls (−0.004 ± 0.533. The mean GH level of cases (5.00 ± 6.46 ng/ml was significantly higher than that of controls (1.78 ± 2.04 ng/ml. The mean IGF-1 level of cases (100.25 ± 35.93 ng/ml was significantly lower as compared to controls (233.53 ± 115.06 ng/ml as was the mean IGFBP-3 level (2976.53 ± 1212.82 ng/ml in cases and 5183.28 ± 1531.28 ng/ml in controls. In 12 patients who underwent shunt surgery, growth parameters significantly improved. Conclusions: Marked decrease in weight and height SDSs associated with GH resistance is seen in children with EHPVO, which improves with shunt surgery.

  6. Identification Algorithm for Fusion of Hand Vein Iris and Fingerprint Based on kNN-SVM%基于kNN-SVM的手背静脉虹膜和指纹融合身份识别

    Institute of Scientific and Technical Information of China (English)

    袁臣虎; 刘铁根; 李秀艳

    2013-01-01

    Aiming at the implementation of multi-modal biometric system in identification modal, the efficient identification algorithm based on hand vein, iris and fingerprint was developed. Firstly, feature extraction and feature matching of three unimodal biometric traits was carried out respectively and the independent matching scores of each trait was obtained. Then, k Nearest Neighbor (kNN) classifier was utilized to preliminary identification based on hand vein, and the number of user’s identity would be reduced to k. Finally, Support Vector Machine (SVM) classifier was developed to accuracy identification of user’s identity based on iris and fingerprint. The constructing three-modal biometric image database was used to experimental analysis. The results show that the system has good identification performance, which possesses wide application prospect.%  针对识别模式下多生物特征融合识别系统的实现问题,本文基于手背静脉、虹膜和指纹三种生物特征研究了高效的融合识别算法。分别对三种生物特征进行特征提取与匹配,得到独立的匹配分数,基于k近邻(k Nearest Neighbor, kNN)分类器实现手背静脉特征识别,将用户身份范围缩小到k个,实现个人身份的初步识别,利用支持向量机(Support Vector Machine, SVM)算法实现k个样本范围内虹膜和指纹的融合识别,实现最终的个人身份识别。利用构建的三模态生物特征图像数据库进行了实验分析,实验结果表明该系统具有较高的识别性能,具有广阔的应用前景。

  7. National Utilization Patterns of Steroid Injection and Operative Intervention for Treatment of Common Hand Conditions

    Science.gov (United States)

    Sears, Erika D.; Swiatek, Peter R.; Chung, Kevin C

    2015-01-01

    Purpose To conduct a population-level analysis of practice trends and probability of surgery based on the number of steroid injections for common hand conditions. Methods Patients at least 18 years old receiving injection or surgery for carpal tunnel syndrome (CTS), trigger finger (TF), or De Quervain tenovaginitis (DQ) were identified for inclusion using the 2009–2013 Truven MarketScan databases. The number of injections performed was counted, and time between injection and operation was calculated for patients receiving both treatments. A multivariable logistic regression model was created to evaluate the odds of undergoing surgery based on the number of injections performed, controlling for patient age, sex, comorbidities, and insurance type. Results The study sample included 251,030 patients who underwent steroid injection or operative release for CTS (n=129,917), TF (n=102,778), and DQ (n=18,335). The majority of CTS patients were managed with immediate surgery (71%), whereas most patients with TF and DQ were managed initially with injection (74% and 84%, respectively). Among patients receiving both an injection and an operation, a single injection was the most common practice prior to surgery (69%, 58%, and 67% of patients with CTS, TF, and DQ, respectively). Multiple injections for DQ and TF were associated with relatively low predicted probability of surgery (17% and 26%, respectively, after 2 injections). However, the predicted probability of surgery after two injections was higher in patients with CTS (44%). Conclusions Given the associated probability of surgery after multiple injections for the three hand conditions examined, the practice of repeat injections should be critically examined to determine whether underuse or overuse is present and whether efficiency and resource utilization can be improved upon. Level of Evidence Level II (retrospective prognostic study) PMID:26774548

  8. Pattern of bone erosion and bone proliferation in psoriatic arthritis hands

    DEFF Research Database (Denmark)

    Poggenborg, René Panduro; Bird, P; Boonen, A;

    2014-01-01

    OBJECTIVES: To investigate the pattern and development of bone erosion and proliferation in patients with psoriatic arthritis (PsA) during treatment with adalimumab, using high-resolution computed tomography (CT) and conventional radiography. METHOD: Forty-one biologic-naïve PsA patients were...... revealed in more detail by CT than by radiography. No overall progression or repair could be detected during adalimumab treatment with either of the methods....

  9. Regeneration of surgically created mixed-handed axolotl forelimbs: pattern formation in the dorsal-ventral axis.

    Science.gov (United States)

    Holder, N; Weekes, C

    1984-08-01

    The regeneration of surgically created mixed-handed limb stumps is examined in the axolotl. Operations were performed in the lower arm and upper arm regions and grafts were allowed to heal for approximately one month prior to amputation or were amputated immediately. In the lower arm group both anterior and posterior limb halves were inverted, whereas only posterior halves were inverted in the upper arm group. Almost all the limbs regenerated were normal in the anterior-posterior axis, whereas a range of limb types were found when the dorsal-ventral axis was analysed using the metacarpal muscle pattern and epidermal Leydig cell number as positional markers. The carpal and forearm muscle patterns were also analysed in order to assess whether the pattern determined from analysis at the metacarpal level reflected that seen at more proximal levels. The results are discussed in terms of the possible role of cell contribution from the stump to the blastema and the relevance of the study to models of pattern regulation.

  10. Gonadal vein tumor thrombosis due to renal cell carcinoma

    Directory of Open Access Journals (Sweden)

    Hamidreza Haghighatkhah

    2015-01-01

    Full Text Available Renal cell carcinoma (RCC had a tendency to extend into the renal vein and inferior vena cava, while extension into the gonadal vein has been rarely reported. Gonadal vein tumor thrombosis appears as an enhancing filling defect within the dilated gonadal vein anterior to the psoas muscle and shows an enhancement pattern identical to that of the original tumor. The possibility of gonadal vein thrombosis should be kept in mind when looking at an imaging study of patients with RCC

  11. Gonadal vein tumor thrombosis due to renal cell carcinoma.

    Science.gov (United States)

    Haghighatkhah, Hamidreza; Karimi, Mohammad Ali; Taheri, Morteza Sanei

    2015-01-01

    Renal cell carcinoma (RCC) had a tendency to extend into the renal vein and inferior vena cava, while extension into the gonadal vein has been rarely reported. Gonadal vein tumor thrombosis appears as an enhancing filling defect within the dilated gonadal vein anterior to the psoas muscle and shows an enhancement pattern identical to that of the original tumor. The possibility of gonadal vein thrombosis should be kept in mind when looking at an imaging study of patients with RCC.

  12. Portal Vein Thrombosis

    OpenAIRE

    Hakan Demirci

    2016-01-01

    Portal vein thrombosis is an important cause of presinusoidal portal hypertension. Portal vein thrombosis commonly occurs in patient with cirrhosis, malignancy and prothrombotic states. Patients with acute portal vein thrombosis have immediate onset. Patients with chronic portal vein thrombosis have developed portal hypertension and cavernous portal transformation. Portal vein thrombosis is diagnosed with doppler ultrasound, computed tomography and magnetic resonance imaging. Therapy with low...

  13. Focus on Varicose Veins

    Science.gov (United States)

    ... veins, which are the visible purple or greenish-blue veins that appear in our legs. Spider veins or teleangiectesias are tiny veins that you ... reduce leg swelling and decrease the risk of blood clots. Prescription ... sclerosing solution into spider, reticular or varicose veins. This is a minimally ...

  14. A Case of Persistent Sciatic Artery Aneurysm Accompanied by a Persistent Sciatic Vein

    OpenAIRE

    Tadakoshi, Masao; Ohta, Takashi; Ishibashi, Hiroyuki; Sugimoto, Ikuo; Iwata, Hirohide; Yamada, Tetsuya; Hida, Noriyuki; Orimoto, Yuki

    2010-01-01

    A persistent sciatic artery is a rare anomaly. On the other hand, a persistent sciatic vein is frequently associated with Klippel-Trenaunay syndrome. In a 71-year-old female with a complete-type persistent sciatic artery aneurysm, we performed aneurysmectomy and right femoropopliteal bypass surgery. The right popliteal vein drained into the femoral vein via a lower-type persistent sciatic vein and the deep femoral vein. The superficial femoral artery and vein were hypoplastic. Since only 4 ca...

  15. A Vein Map Biometric System

    Directory of Open Access Journals (Sweden)

    Felix Fuentes

    2013-08-01

    Full Text Available There is increasing demand world-wide, from government agencies and the private sector for cutting-edge biometric security technology that is difficult to breach but userfriendly at the same time. Some of the older tools, such as fingerprint, retina and iris scanning, and facial recognition software have all been found to have flaws and often viewed negatively because of many cultural and hygienic issues associated with them. Comparatively, mapping veins as a human barcode, a new technology, has many advantages over older technologies. Specifically, reproducing a three-dimensional model of a human vein system is impossible to replicate. Vein map technology is distinctive because of its state-of-the-art sensors are only able to recognize vein patterns if hemoglobin is actively flowing through the person

  16. Palm Vein Verification Using Gabor Filter

    Directory of Open Access Journals (Sweden)

    Ali Mohsin Al-Juboori

    2013-01-01

    Full Text Available Palm vein authentication is one of the modern biometric techniques, which employs the vein pattern in the human palm to verify the person. The merits of palm vein on classical biometric (e.g. fingerprint, iris, face are a low risk of falsification, difficulty of duplicated and stability. In this research, a new method is proposed for personal verification based on palm vein features. In the propose method, the palm vein images are firstly enhanced and then the features are extracted by using bank of Gabor filters. Then Fisher Discriminated Analysis (FDA is used to reduce the dimension of the features vectors. For vein pattern verification, this work uses Nearest Neighbors method. The EER of the proposed method is 0.2335%.

  17. EMG pattern classification to control a hand orthosis for functional grasp assistance after stroke.

    Science.gov (United States)

    Meeker, Cassie; Park, Sangwoo; Bishop, Lauri; Stein, Joel; Ciocarlie, Matei

    2017-07-01

    Wearable orthoses can function both as assistive devices, which allow the user to live independently, and as rehabilitation devices, which allow the user to regain use of an impaired limb. To be fully wearable, such devices must have intuitive controls, and to improve quality of life, the device should enable the user to perform Activities of Daily Living. In this context, we explore the feasibility of using electromyography (EMG) signals to control a wearable exotendon device to enable pick and place tasks. We use an easy to don, commodity forearm EMG band with 8 sensors to create an EMG pattern classification control for an exotendon device. With this control, we are able to detect a user's intent to open, and can thus enable extension and pick and place tasks. In experiments with stroke survivors, we explore the accuracy of this control in both non-functional and functional tasks. Our results support the feasibility of developing wearable devices with intuitive controls which provide a functional context for rehabilitation.

  18. Spider Vein Removal

    Science.gov (United States)

    Spider veins: How are they removed? I have spider veins on my legs. What options are available ... M.D. Several options are available to remove spider veins — thin red lines or weblike networks of ...

  19. Impaired anticipatory control of force sharing patterns during whole-hand grasping in Parkinson's disease.

    Science.gov (United States)

    Muratori, Lisa M; McIsaac, Tara L; Gordon, Andrew M; Santello, Marco

    2008-02-01

    We examined the coordination of multi-digit grasping forces as they developed during object grasping and lifting. Ten subjects with Parkinson's disease (PD; OFF and ON medication) and ten healthy age-matched control subjects lifted a manipulandum that measured normal forces at each digit and the manipulandum's position. The center of mass (CM) was changed from trial to trial in either a predictable (blocked) or unpredictable (random) order. All subjects modulated individual fingertip forces to counterbalance forces exerted by the thumb and minimize object tilt after lift-off. However, subjects with PD OFF exhibited an impaired ability to use anticipatory mechanisms resulting in less differentiated scaling of individual finger forces to the object CM location. Remarkably, these between-group differences in force modulation dissipated as subjects reached peak grip forces during object lift, although these occurred significantly later in subjects with PD OFF than controls and PD ON. Analysis of the tilt of the object during lift revealed all subjects had similar deviations of the object from the vertical, the direction of which depended on CM location. Thus these findings in subjects with PD indicate that: (a) PD-induced impairments in anticipatory force mechanisms appear to be greatly increased in multi-digit grasping as opposed to previous reports from two-digit grasping; (b) inaccurate scaling of fingertip force amplitude and sharing patterns before object lift is recovered during object lift; (c) the implementation of appropriate force amplitude and sharing among the digits during the lift occurs significantly later than for controls; (d) medication improves the temporal recovery of multi-digit force coordination. These results are discussed within the framework of PD-related deficits in sensorimotor integration and control of multi-degrees of freedom movement.

  20. Variations of lumbrical muscle innervation patterns in the hand, focusing on the dual innervation of the third lumbrical muscle.

    Science.gov (United States)

    Hur, Mi-Sun

    2017-02-01

    This study was conducted to clarify the innervation patterns of the lumbrical muscles by identifying the origin of the nerve fascicles innervating these muscles. The lumbricals in the hand were investigated in 50 specimens of embalmed Korean adult cadavers. Dual innervation of the third lumbrical was most frequently observed in 64.0%. The third lumbrical was innervated by a branch arising from the median nerve (MN) distal to site at which the superficial branch of the ulnar nerve (sUN) joins the MN in 34%. When separating and tracing the nerve fascicles from the MN distal to the communicating branch from the sUN to MN, the fascicles contained parts of the MN and sUN in 18% and part of the MN in 16%. These results will be helpful for accurate diagnoses, surgical procedures, and electrophysiological examinations in lesions of the MN and ulnar nerve in the hand. Muscle Nerve, 2016 Muscle Nerve 55: 160-165, 2017. © 2016 Wiley Periodicals, Inc.

  1. Sclerotherapy of Varicose Veins and Spider Veins

    Science.gov (United States)

    ... you as to whether the procedure was a technical success when it is completed. Your interventional radiologist ... Varicose Veins) Phlebectomy of Varicose Veins Contrast Materials Anesthesia Safety Sponsored by Please note RadiologyInfo.org is ...

  2. Vein Problems Related to Varicose Veins

    Science.gov (United States)

    ... telangiectasias. Spider veins involve the capillaries, the smallest blood vessels in the body. Spider veins often appear on the legs and face. They're red or blue and usually look like a spider web or ...

  3. Portal Vein Thrombosis

    Directory of Open Access Journals (Sweden)

    Hakan Demirci

    2016-01-01

    Full Text Available Portal vein thrombosis is an important cause of presinusoidal portal hypertension. Portal vein thrombosis commonly occurs in patient with cirrhosis, malignancy and prothrombotic states. Patients with acute portal vein thrombosis have immediate onset. Patients with chronic portal vein thrombosis have developed portal hypertension and cavernous portal transformation. Portal vein thrombosis is diagnosed with doppler ultrasound, computed tomography and magnetic resonance imaging. Therapy with low molecular weight heparin achieves recanalization in more than half of acute cases.

  4. Corrosion cast study of the canine hepatic veins.

    Science.gov (United States)

    Uršič, M; Vrecl, M; Fazarinc, G

    2014-11-01

    This study presents a detailed description of the distribution, diameters and drainage patterns of hepatic veins on the basis of the corrosion cast analysis in 18 dogs. We classified the hepatic veins in three main groups: the right hepatic veins of the caudate process and right lateral liver lobe, the middle hepatic veins of the right medial and quadrate lobes and the left hepatic veins of both left liver lobes and the papillary process. The corrosion cast study showed that the number of the veins in the Nomina Anatomica Veterinaria and most anatomical textbooks is underestimated. The number of various-sized hepatic veins of the right liver division ranged from 3 to 5 and included 1 to 4 veins from the caudate process and 2 to 4 veins from the right lateral liver lobe. Generally, in all corrosion casts, one middle-sized vein from the right part of the right medial lobe, which emptied separately in the caudal vena cava, was established. The other vein was a large-sized vein from the remainder of the central division, which frequently joined the common left hepatic vein from the left liver lobes. The common left hepatic vein was the largest of all the aforementioned hepatic veins.

  5. 利用I&和*m指标法对山东赤松种群空间分布格局纹理的研究%A Study with I& and *m Index on the Vein of Spatial Patterns of Pinus densiflora Population in Shandong Province

    Institute of Scientific and Technical Information of China (English)

    张伟; 赵善伦

    2002-01-01

    With the methods of I& and *m index,the vein of spatial patterns of P. Densiflora population in Shandong province has been preliminarily studied.The results show that the clump is bigger and the vein is rougher for P.densiflora forest with high administrative age levels than that with low age levels.The clump of artificial forest doesn't show evident patches,and the vein is trifling.The individual distribution pattern of P.densiflora forest with light artificial influence is always random,while that of P.densiflora forest with heavy artificial influence is always even.

  6. Rapid engorgement of dorsal vein of hand difficult-to-puncture by using lukewarm ginger juice immersion and arm-throwing-and-tourniquet-vertical-binding method%温生姜水浸泡联合甩手垂扎法快速充盈手背高难穿刺静脉

    Institute of Scientific and Technical Information of China (English)

    林关聪; 陈瑞珍; 梁刚; 王景平

    2011-01-01

    目的 探讨温生姜水浸泡联合甩手垂扎法快速充盈手背高难穿刺静脉的效果.方法 将手背高难穿刺静脉患者165例随机分为观察1组、观察2组和对照组各55例.观察1组静脉穿刺前采用热水浸手并甩手垂扎压脉带,观察2组静脉穿刺前采用生姜水浸手并甩手垂扎压脉带,对照组采用热水袋热敷手背部后在输液台扎压脉带.比较三组患者静脉充盈程度、一次静脉穿刺成功率.结果 三组手背静脉充盈效果和一次穿刺成功率比较,差异有统计学意义(均P<0.01),其中观察2组效果最好.结论 手背高难穿刺静脉患者采用温生姜水浸泡联合甩手垂扎法有助于静脉快速充盈,提高一次穿刺成功率.%Objective To rapidly engorge dorsal vein of hand which is difficult to puncture by using lukewarm ginger juice immersion and arm-throwing-and-tourniquet-vertical-binding method. Methods A total of 165 cases whose dorsal vein of hand was difficult to puncture were commensurably and randomly divided into 3 groups. In group 1, patients' hands were immersed into hot water and then were asked to throw their arms for several times and held their hands downwards. And immediately, nurses tied the tourniquet above the site to be punctured. Group 2 employed almost the same method except that their hands were soaked into lukewarm ginger juice. As for the control group, their hands were compressed with hot water bag for a while, and then, a tourniquet was tied above the site to be punctured when their hands were held on the infusion stand. The extent to which the dorsal veins of hand was engorged, and success rate of single venopuncture among the 3 groups were compared. Results There were significant differences in the extent of dorsal vein of hand engorgement, and success rate of single venopuncture among the 3 groups (P<0.01 for both), with group 2 having the strongest engorgement and the highest success rate. Conclusion The method of

  7. Augmented reality based real-time subcutaneous vein imaging system.

    Science.gov (United States)

    Ai, Danni; Yang, Jian; Fan, Jingfan; Zhao, Yitian; Song, Xianzheng; Shen, Jianbing; Shao, Ling; Wang, Yongtian

    2016-07-01

    A novel 3D reconstruction and fast imaging system for subcutaneous veins by augmented reality is presented. The study was performed to reduce the failure rate and time required in intravenous injection by providing augmented vein structures that back-project superimposed veins on the skin surface of the hand. Images of the subcutaneous vein are captured by two industrial cameras with extra reflective near-infrared lights. The veins are then segmented by a multiple-feature clustering method. Vein structures captured by the two cameras are matched and reconstructed based on the epipolar constraint and homographic property. The skin surface is reconstructed by active structured light with spatial encoding values and fusion displayed with the reconstructed vein. The vein and skin surface are both reconstructed in the 3D space. Results show that the structures can be precisely back-projected to the back of the hand for further augmented display and visualization. The overall system performance is evaluated in terms of vein segmentation, accuracy of vein matching, feature points distance error, duration times, accuracy of skin reconstruction, and augmented display. All experiments are validated with sets of real vein data. The imaging and augmented system produces good imaging and augmented reality results with high speed.

  8. Hand to hand.

    Science.gov (United States)

    Bedell, Susanna E; Graboys, Thomas B

    2002-08-01

    Examination of the hands has the potential to transform the encounter between physician and patient. Taking the hands conveys a sense of warmth and connectedness and is a means to communicate the physician's mindfulness. The hands can focus the examination on the individual patient as a complete human being, and not merely a disease or a collection of symptoms. The hands provide readily accessible information that may not be available through other evaluations, and they offer clues to a patient's physical and mental health. Commonplace observations, such as those revealed in the hands, can unravel medical mysteries and provide profound clinical insights.

  9. Epidemiological analysis, detection, and comparison of space-time patterns of Beijing hand-foot-mouth disease (2008-2012.

    Directory of Open Access Journals (Sweden)

    Jiaojiao Wang

    Full Text Available BACKGROUND: Hand, foot, and mouth disease (HFMD mostly affects the health of infants and preschool children. Many studies of HFMD in different regions have been published. However, the epidemiological characteristics and space-time patterns of individual-level HFMD cases in a major city such as Beijing are unknown. The objective of this study was to investigate epidemiological features and identify high relative risk space-time HFMD clusters at a fine spatial scale. METHODS: Detailed information on age, occupation, pathogen and gender was used to analyze the epidemiological features of HFMD epidemics. Data on individual-level HFMD cases were examined using Local Indicators of Spatial Association (LISA analysis to identify the spatial autocorrelation of HFMD incidence. Spatial filtering combined with scan statistics methods were used to detect HFMD clusters. RESULTS: A total of 157,707 HFMD cases (60.25% were male, 39.75% were female reported in Beijing from 2008 to 2012 included 1465 severe cases and 33 fatal cases. The annual average incidence rate was 164.3 per 100,000 (ranged from 104.2 in 2008 to 231.5 in 2010. Male incidence was higher than female incidence for the 0 to 14-year age group, and 93.88% were nursery children or lived at home. Areas at a higher relative risk were mainly located in the urban-rural transition zones (the percentage of the population at risk ranged from 33.89% in 2011 to 39.58% in 2012 showing High-High positive spatial association for HFMD incidence. The most likely space-time cluster was located in the mid-east part of the Fangshan district, southwest of Beijing. CONCLUSIONS: The spatial-time patterns of Beijing HFMD (2008-2012 showed relatively steady. The population at risk were mainly distributed in the urban-rural transition zones. Epidemiological features of Beijing HFMD were generally consistent with the previous research. The findings generated computational insights useful for disease surveillance, risk

  10. Portal Vein Thrombosis

    Directory of Open Access Journals (Sweden)

    Ronny Cohen

    2015-01-01

    Full Text Available Portal vein thrombosis (PVT is the blockage or narrowing of the portal vein by a thrombus. It is relatively rare and has been linked with the presence of an underlying liver disease or prothrombotic disorders. We present a case of a young male who presented with vague abdominal symptoms for approximately one week. Imaging revealed the presence of multiple nonocclusive thrombi involving the right portal vein, the splenic vein, and the left renal vein, as well as complete occlusion of the left portal vein and the superior mesenteric vein. We discuss pathogenesis, clinical presentation, and management of both acute and chronic thrombosis. The presence of PVT should be considered as a clue for prothrombotic disorders, liver disease, and other local and general factors that must be carefully investigated. It is hoped that this case report will help increase awareness of the complexity associated with portal vein thrombosis among the medical community.

  11. 肝硬化门静脉高压症不同手术方式与血栓形成%Different operative patterns for cirrhotic portal hypertensive patients and development of portal vein thrombosis

    Institute of Scientific and Technical Information of China (English)

    吴婷婷; 吴志勇; 罗蒙

    2014-01-01

    relationship between different operation patterns for patients with portal hypertension caused by hepatic cirrhosis and examine the incidence,position and risk fac-tors of portal vein thrombosis (PVT).Methods From January 201 1 to December 2012,72 patients with portal hypertension in liver cirrhosis were analyzed.There were devascularization (n =25 ),se-lective devascularization (n = 1 5 )and splenorenal shunt associated with devascularization (n = 32). Platelet,prothrombin time,hemodynamics of portal vein and the incidence of PVT were analyzed be-fore and after operation.Results Pre-operative blood velocity of portal vein decreased remarkably in patients with PVT while both groups showed no difference in factors of coagulation function.No re-markable inter-group difference existed in platelet levels,but D-dimer levels were higher than nor-mal though the inter-group difference was insignificant.At 2 weeks and 2 months post-devascular-ization,splenic vein thrombosis extended to trunk and branch(es)of portal vein in 12(48%)patients. After selective devascularization,some of them had thrombosis extended to trunk of portal vein or branch(es)and blocked gastric coronary vein and paraesophageal vein.While another few patients on-ly showed superior mesenteric vein,gastric coronary vein and paraesophageal vein,with splenic vein and portal vein completely blocked.After splenorenal shunt associated with devascularization,the rate of PVT was 75% at 2 months post-operation and decreased to 41 % at 6 months.And it was the lowest among 3 groups.Most patients suffered partial thrombosis in portal trunk and(or)branches while only 1 case had the partially blocked shunt.Conclusion Occurring at different sites in trunk or branch(es)of portal vein after splenorenal shunt associated with devascularization,PVT may be cor-related with the changes of portal hemodynamics.

  12. Biometric analysis of the palm vein distribution by means two different techniques of feature extraction

    Science.gov (United States)

    Castro-Ortega, R.; Toxqui-Quitl, C.; Solís-Villarreal, J.; Padilla-Vivanco, A.; Castro-Ramos, J.

    2014-09-01

    Vein patterns can be used for accessing, identifying, and authenticating purposes; which are more reliable than classical identification way. Furthermore, these patterns can be used for venipuncture in health fields to get on to veins of patients when they cannot be seen with the naked eye. In this paper, an image acquisition system is implemented in order to acquire digital images of people hands in the near infrared. The image acquisition system consists of a CCD camera and a light source with peak emission in the 880 nm. This radiation can penetrate and can be strongly absorbed by the desoxyhemoglobin that is presented in the blood of the veins. Our method of analysis is composed by several steps and the first one of all is the enhancement of acquired images which is implemented by spatial filters. After that, adaptive thresholding and mathematical morphology operations are used in order to obtain the distribution of vein patterns. The above process is focused on the people recognition through of images of their palm-dorsal distributions obtained from the near infrared light. This work has been directed for doing a comparison of two different techniques of feature extraction as moments and veincode. The classification task is achieved using Artificial Neural Networks. Two databases are used for the analysis of the performance of the algorithms. The first database used here is owned of the Hong Kong Polytechnic University and the second one is our own database.

  13. Dorsal Hand Vein Recognition Algorithm Based on Ridgelet Transforming of Divided Blocks%基于分块脊波变换的手背静脉识别算法

    Institute of Scientific and Technical Information of China (English)

    贾旭; 薛定宇; 崔建江; 刘晶

    2011-01-01

    提出一种分块提取局部方向特征,并将所有特征融合的静脉识别算法.首先,静脉图像经预处理后,利用改进的细化算法对获得的二值图像进行细化处理,得到了静脉的骨架信息;其次,将细化后的静脉图像进行分块,对分块后所有的子图像进行脊波变换,并对脊波分解系数进行主成分分析(PCA)降维,得到静脉图像的特征向量;最后,基于图像特征向量,利用支持向量机(SVM)对静脉图像进行分类匹配.试验表明,该算法获得的静脉图像特征具有较高的区分度,识别效果受图像采集和预处理过程出现的误差影响较小,正确识别率可达到97%以上.%A vein recognition algorithm based on fusing all local directional features which are extracted from divided blocks is proposed. Firstly, the acquired binary image is thinned by improved thinning algorithm after vein image pre-processing and the vein skeleton information is obtained. Secondly, the thinned vein image is divided into blocks. Then, every sub-image is processed by ridgelet transforming, the dimensions of ridgelet transforming coefficients are reduced by applying principal component analysis, and the eigenvectors of vein image are acquired. Finally, vein images are classified and matched through making use of support vector machine based on the eigenvectors of image. Experimental results show that eigenvectors which are acquired through proposed algorithm have better discrimination, recognition results are affected less by errors that are generated in image acquiring and pre-processing, and the correct recognition rate exceeds 97%.

  14. Recognition of Hand Grasp Preshaping Patterns Applied to Prosthetic Hand Electromyography Control%基于预抓取模式识别的假手肌电控制方法

    Institute of Scientific and Technical Information of China (English)

    杨大鹏; 赵京东; 李楠; 姜力; 刘宏

    2012-01-01

    It appears a big challenge when the multi-DOFs prosthetic hand is controlled by the electromyography (EMG) signals. A novel recognition method of the hand grasp preshaping patterns is proposed to the HIT-DLR prosthetic hand's EMG control. A new online detection method is designed to collect the accurate onset EMG signals of the grasp preshaping, which uses the Teager-Kaiser energy (TKE) operator and post processing to enlarge the changes of the EMG signal and deal with the spike noise, respectively. Focusing on 4 types of the hand preshaping patterns, different data segmentation methods, different features coming from the time-domain, frequency domain and time-frequency domain, and various classifiers are attempted to find the best classification accuracy. The waveform length and support vector machine are chosen, which can reach an accuracy of 95% and a response time less than 300 ms. The experiment of the prosthetic hand control shows that the hand can swiftly grasp the objects with various shapes.%为解决多自由度假手肌电控制难题,建立一种人手预抓取模式的在线识别方法,并将其应用至HIT-DLR假手的抓取控制.基于Teager-Kaiser能量算子增幅肌电信号在肌肉动作发起时的变化,引入后处理解决噪声影响,提出一种预抓取发起的在线检测方法.针对人手4种预抓取模式,讨论不同肌电信号分段方法,不同时域特征、频域特征和时频域特征以及多种分类方法所能获得的识别成功率.最终建立了基于波形长度及支持矢量机的最优识别方法,成功率可达95%,延迟小于300 ms.肌电控制试验表明,假手可以准确快速地抓取各种不同形状的物体.

  15. The hot (invisible? hand: can time sequence patterns of success/failure in sports be modeled as repeated random independent trials?

    Directory of Open Access Journals (Sweden)

    Gur Yaari

    Full Text Available The long lasting debate initiated by Gilovich, Vallone and Tversky in [Formula: see text] is revisited: does a "hot hand" phenomenon exist in sports? Hereby we come back to one of the cases analyzed by the original study, but with a much larger data set: all free throws taken during five regular seasons ([Formula: see text] of the National Basketball Association (NBA. Evidence supporting the existence of the "hot hand" phenomenon is provided. However, while statistical traces of this phenomenon are observed in the data, an open question still remains: are these non random patterns a result of "success breeds success" and "failure breeds failure" mechanisms or simply "better" and "worse" periods? Although free throws data is not adequate to answer this question in a definite way, we speculate based on it, that the latter is the dominant cause behind the appearance of the "hot hand" phenomenon in the data.

  16. The hot (invisible?) hand: can time sequence patterns of success/failure in sports be modeled as repeated random independent trials?

    Science.gov (United States)

    Yaari, Gur; Eisenmann, Shmuel

    2011-01-01

    The long lasting debate initiated by Gilovich, Vallone and Tversky in [Formula: see text] is revisited: does a "hot hand" phenomenon exist in sports? Hereby we come back to one of the cases analyzed by the original study, but with a much larger data set: all free throws taken during five regular seasons ([Formula: see text]) of the National Basketball Association (NBA). Evidence supporting the existence of the "hot hand" phenomenon is provided. However, while statistical traces of this phenomenon are observed in the data, an open question still remains: are these non random patterns a result of "success breeds success" and "failure breeds failure" mechanisms or simply "better" and "worse" periods? Although free throws data is not adequate to answer this question in a definite way, we speculate based on it, that the latter is the dominant cause behind the appearance of the "hot hand" phenomenon in the data.

  17. The study of intramuscular nerve distribution patterns and relative spindle abundance of the thenar and hypothenar muscles in human hand.

    Science.gov (United States)

    Xie, Peng; Jiang, Yanjun; Zhang, Xiaoming; Yang, Shengbo

    2012-01-01

    The intramuscular nerve distribution and relative spindle abundance of the human hand have not been well defined, although this is important in guiding hand surgery. Forty human hands were dissected and subjected to modified Sihler's stain and haematoxylin and eosin stain to investigate intramuscular nerve distribution and relative spindle abundance, respectively. The flexor pollicis brevis (FPB), adductor pollicis (AP), and abductor digiti minimi (ADM) contain separate nerve compartments. Neural anastomoses were observed in the thenar and hypothenar muscles, including the Y-like, O-like, H-like, and U-like appearance. We found that U-like neural anastomoses may be the characteristic of the opponens muscles. The relative spindle abundance was the greatest in the opponens muscles which may coordinate fine movements. Except for the two opponens muscles, the rest of the thenar and hypothenar muscles could be used as whole muscle or half-muscle donors for muscle transplant. Our nerve map of the hand offers valuable guidance for hand reconstruction.

  18. Image Enhancement of Finger-vein Patterns based on Median Filtering%基于中值滤波的手指静脉图像增强

    Institute of Scientific and Technical Information of China (English)

    栾孟杰

    2012-01-01

    提出了一种基于中值滤波的手指静脉图像增强方法,本算法包括去噪、对比度增强和高通滤波增强.中值滤波在去除图像噪声的同时较好地保护了图像所包含的边缘信息,对比度增强加大了血管和背景的整体对比度,最后的高通滤波增强进一步增强了血管和组织的纹理结构.实验表明,本算法不但对图像去噪效果好,而且能有效地增强图像的对比度,改善图像的质量.%A method to enhance the finger-vein image fine structure and the whole contrast was proposed based on median filtering. The method includes denoising, contrast enhancement, and highpass filtering enhanced method. Median filtering can filter the noise of the image and better protect the information contained in the edge of image; contrast enhancement is adopted to enlarge the contrast of image; the finger-vein was enhanced and fine structures was improved by using high-pass filtering method. The experimental results show that this method is effective.

  19. Preterm to early postterm changes in the development of hand-mouth contact and other motor patterns

    NARCIS (Netherlands)

    Takaya, R; Yukuo, K; Bos, AF; Einspieler, C

    2003-01-01

    Hand-mouth contacts (HMCs) and other spontaneous movements of five low-risk preterm infants were studied longitudinally after their birth until 60 weeks postmenstrual age. For all infants, HMCs that emerged in the preterm period could not be observed transiently after 45 weeks, however, they re-emer

  20. Hand Function in Relation to Brain Lesions and Corticomotor-Projection Pattern in Children with Unilateral Cerebral Palsy

    Science.gov (United States)

    Holmstrom, Linda; Vollmer, Brigitte; Tedroff, Kristina; Islam, Mominul; Persson, Jonas Ke; Kits, Annika; Forssberg, Hans; Eliasson, Ann-Christin

    2010-01-01

    Aim: To investigate relationships between hand function, brain lesions, and corticomotor projections in children with unilateral cerebral palsy (CP). Method: The study included 17 children (nine males, eight females; mean age 11.4 [SD 2.4] range 7-16y), with unilateral CP at Gross Motor Function Classification System level I and Manual Ability…

  1. [Right ovarian vein syndrome].

    Science.gov (United States)

    Arvis, G

    1985-01-01

    Right ovarian vein syndrome is revealed in pregnancy by right lumbar pains, and even by nephritic colics. It results from a congenital malposition of the right ovarian vein, which presses the right ureter on the external iliac artery. Diagnosis is by intravenous urography and retrograde ureteral pyelography. If pain persists despite treatment by analgesics, it may be necessary to place a double-J catheter, and to operate after delivery to ligate the ovarian vein.

  2. Postpartum renal vein thrombosis.

    Science.gov (United States)

    Rubens, D; Sterns, R H; Segal, A J

    1985-01-01

    Renal vein thrombosis in adults is usually a complication of the nephrotic syndrome. Rarely, it has been reported in nonnephrotic women postpartum. The thrombosis may be a complication of the hypercoagulable state associated with both the nephrotic syndrome and pregnancy. Two postpartum patients with renal vein thrombosis and no prior history of renal disease are reported here. Neither patient had heavy proteinuria. In both cases, pyelonephritis was suspected clinically and the diagnosis of renal vein thrombosis was first suggested and confirmed by radiologic examination. Renal vein thrombosis should be considered in women presenting postpartum with flank pain.

  3. A new approach for sclera vein recognition

    Science.gov (United States)

    Thomas, N. L.; Du, Yingzi; Zhou, Zhi

    2010-04-01

    The vein structure in the sclera is stable over time, unique to each person, and well suited for human identification. A few researchers have performed sclera vein pattern recognition and reported promising initial results. Sclera recognition poses several challenges: the vein structure moves and deforms with the movement of the eye; images of sclera patterns are often defocused and/or saturated; and, most importantly, the vein structure in the sclera is multi-layered and has complex non-linear deformation. In this paper, we proposed a new method for sclera recognition: First, we developed a color-based sclera region estimation scheme for sclera segmentation. Second, we designed a Gabor wavelet-based sclera pattern enhancement method, and an adaptive thresholding method to emphasize and binarize the sclera vein patterns. Third, we proposed a line descriptor-based feature extraction, registration, and matching method that is illumination-, scale-, orientation-, and deformation-invariant, and can mitigate the multi-layered deformation effects exhibited in the sclera and tolerate segmentation error. It is empirically verified using the UBIRIS database that the proposed method can perform accurate sclera recognition.

  4. Veins improve fracture toughness of insect wings.

    Directory of Open Access Journals (Sweden)

    Jan-Henning Dirks

    Full Text Available During the lifetime of a flying insect, its wings are subjected to mechanical forces and deformations for millions of cycles. Defects in the micrometre thin membranes or veins may reduce the insect's flight performance. How do insects prevent crack related material failure in their wings and what role does the characteristic vein pattern play? Fracture toughness is a parameter, which characterises a material's resistance to crack propagation. Our results show that, compared to other body parts, the hind wing membrane of the migratory locust S. gregaria itself is not exceptionally tough (1.04±0.25 MPa√m. However, the cross veins increase the wing's toughness by 50% by acting as barriers to crack propagation. Using fracture mechanics, we show that the morphological spacing of most wing veins matches the critical crack length of the material (1132 µm. This finding directly demonstrates how the biomechanical properties and the morphology of locust wings are functionally correlated in locusts, providing a mechanically 'optimal' solution with high toughness and low weight. The vein pattern found in insect wings thus might inspire the design of more durable and lightweight artificial 'venous' wings for micro-air-vehicles. Using the vein spacing as indicator, our approach might also provide a basis to estimate the wing properties of endangered or extinct insect species.

  5. Adaptation of the Main Peripheral Artery and Vein to Long Term Confinement (MARS 500)

    OpenAIRE

    Philippe Arbeille; Romain Provost; Nicole Vincent; Andre Aubert

    2014-01-01

    PURPOSE: The objective was to check if 520 days in confinement (MARS 500), may affect the main peripheral arterial diameter and wall thickness and the main vein size. METHOD: Common carotid (CC) femoral artery (FA) portal vein (PV), jugular (JG), femoral vein (FV) and tibial vein were assessed during MARS 500 by echography, performed by the subjects. A hand free volumic echographic capture method and a delayed 3D reconstruction software developed by our lab were used for collecting and measur...

  6. What Causes Varicose Veins?

    Science.gov (United States)

    ... blood flow, and thin, stretched walls. The middle image shows where varicose veins might appear in a leg. Figure A shows ... blood flow, and thin, stretched walls. The middle image shows where varicose veins might appear in a leg. Older age or ...

  7. 现存蜉蝣翅基纵脉走向及愈合模式(昆虫纲:蜉蝣目)%The bracing and fusing pattern of longitudinal veins at base in living mayflies (Insecta: Ephemeroptera)

    Institute of Scientific and Technical Information of China (English)

    周长发

    2007-01-01

    The bracing and merging pattern of basal longitudinal veins plays an important role in phylogeny reconstruction within Pterygota. Unfortunately, the basal venation pattern of living mayflies has changed from the ancestral state in most species, but in very rare cases, the origins of some longitudinal vein bases are preserved and visible. The wing base of Siphluriscus chinensis has an independent subcostal brace, partial stem of the media, visible stem of the cubitus, and indications of the origins of MA and Rs. This kind of wing base plus those of Ephemera rufomaculata and Chromarcys magnifica show the venation groundplan of modern Ephemeroptera (stem of M parallel to or fused with R basally, MA and Rs fused together for certain distance then separate, Cu independent at base).This pattern seems close to that of Neoptera while different from Odonata. In the latter, the M fused with Cu basally.The hypothesized function of subcostal brace in mayflies is to strengthen the connection between distantly separated longitudinal veins because of sclerite plate at radius vein base. This hypothesis also can be used to explain complicated and unique venation of dragonfly.%有翅昆虫翅基纵脉的走向及愈合模式在系统发育重建中占有重要地位.然而,现存蜉蝣翅基纵脉的走向及愈合状况在大部分种类变化极大,无法推测其原始状况,只在极少数种类保留有部分可见残迹.中国拟短丝蜉Siphluriscus chinensis的翅基保留有独立的亚前缘脉弓、部分中脉M和肘脉Cu主干以及前中脉MA及径分脉Rs的走向痕迹.据此并结合红斑蜉Ephemera rufomaculata和大网脉蜉Chromarcys magnifica翅基的相关特征,本文提出了蜉蝣目主要纵脉基部走向及愈合的基本模式,其要点有:中脉主干在基部与径脉主干独自发出后先接近或愈合后又分离、它们各自分成两支后的前中脉及径分脉又先愈合再分离、肘脉始终独立.这种中脉与径脉先接近或愈

  8. Image Quality Enhancement Using the Direction and Thickness of Vein Lines for Finger-Vein Recognition

    OpenAIRE

    Young Ho Park; Kang Ryoung Park

    2012-01-01

    On the basis of the increased emphasis placed on the protection of privacy, biometric recognition systems using physical or behavioural characteristics such as fingerprints, facial characteristics, iris and finger‐vein patterns or the voice have been introduced in applications including door access control, personal certification, Internet banking and ATM machines. Among these, finger‐vein recognition is advantageous in that it involves the use of inexpensive and small devices that are diffic...

  9. Hand Recognition in Live-Streaming Video

    OpenAIRE

    Mikhail, Belov

    2011-01-01

    The article describes the algorithmic component of the pattern recognition method for extracting hand patterns from a video stream. Methods removing excess information from frames, localizing fragments with a hand and extracting hand contours to classify them are described.

  10. Successful thoracoscopic lobectomy for lung cancer in a patient with anatomic variation of the left inferior pulmonary vein

    Directory of Open Access Journals (Sweden)

    Nakano,Hideharu

    2007-04-01

    Full Text Available We present a case of primary lung cancer with a rare distribution pattern of left inferior pulmonary vein (PV, encountered in the thoracoscopic left lower lobectomy. Thoracoscopic observation revealed 2 trunks of inferior PV (ventral and dorsal branch at the stem level. The ventral trunk consisted of a branch of vein (V(5 from the lingular segment and venous ramifications (V(8a, V(9 and V(10a from the basal segment. On the other hand, a branch of vein (V(6 from the superior segment in the lower lobe and other veins (V(8b and V(10b + c from the basal segment emptied together into the dorsal trunk. We successfully carried out a thoracoscopic left lower lobectomy without excision of the aberrant vein (V(5. Retrospective review of the preoperative chest CT demonstrates the double trunk inferior PV and the aberrant lingular branch emptying with V(8a into the ventral trunk. Knowledge of the branching variations of PV from preoperative evaluations leads to appropriate thoracoscopic procedures for lung cancer.

  11. Congenital preduodenal portal vein

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Sang Jin; Hwang, Mi Soo; Huh, Young Soo; Park, Bok Hwan [College of Medicine, Youngnam University, Gyeongsan (Korea, Republic of)

    1991-03-15

    Congenital preduodenal portal vein, first reported by Knight in 1921, is an extremely rare congenital anomaly in which the portal vein passes anteriorly to the duodenum rather than posteriorly in its normal location. It is of surgical significance because it may cause difficulties in operations involving the gall bladder, biliary duct, or duodenum. Recently, we experienced 2 cases of preduodenal portal vein. One was found during surgical exploration for the diagnosis and correction of malrotation of the bowels and the other in a 3 day-old male newborn associated with dextrocardia, situs inversus, and duodenal obstruction by diaphragm. We report these 2 cases with a review of the literature.

  12. Image Quality Enhancement Using the Direction and Thickness of Vein Lines for Finger-Vein Recognition

    Directory of Open Access Journals (Sweden)

    Young Ho Park

    2012-10-01

    Full Text Available On the basis of the increased emphasis placed on the protection of privacy, biometric recognition systems using physical or behavioural characteristics such as fingerprints, facial characteristics, iris and finger-vein patterns or the voice have been introduced in applications including door access control, personal certification, Internet banking and ATM machines. Among these, finger-vein recognition is advantageous in that it involves the use of inexpensive and small devices that are difficult to counterfeit. In general, finger-vein recognition systems capture images by using near infrared (NIR illumination in conjunction with a camera. However, such systems can face operational difficulties, since the scattering of light from the skin can make capturing a clear image difficult. To solve this problem, we proposed new image quality enhancement method that measures the direction and thickness of vein lines. This effort represents novel research in four respects. First, since vein lines are detected in input images based on eight directional profiles of a grey image instead of binarized images, the detection error owing to the non-uniform illumination of the finger area can be reduced. Second, our method adaptively determines a Gabor filter for the optimal direction and width on the basis of the estimated direction and thickness of a detected vein line. Third, by applying this optimized Gabor filter, a clear vein image can be obtained. Finally, the further processing of the morphological operation is applied in the Gabor filtered image and the resulting image is combined with the original one, through which finger-vein image of a higher quality is obtained. Experimental results from application of our proposed image enhancement method show that the equal error rate (EER of finger-vein recognition decreases to approximately 0.4% in the case of a local binary pattern-based recognition and to approximately 0.3% in the case of a wavelet transform

  13. Umbilical and portal vein calcification following umbilical vein catheterization

    Energy Technology Data Exchange (ETDEWEB)

    Schneider, K.; Fendel, H.; Hartl, M.

    1989-07-01

    Calcifications of the umbilical vein and intrahepatic branches of the portal vein developed in a newborn who had inserted an umbilical vein catheter for 11 days postnatally. The calcified intrahepatic portal veins can still be demonstrated sonographically at the age of three years, whereby these calcifications were no longer detectable radiologically. (orig.).

  14. Design of biometrics identification system on palm vein using infrared light

    Science.gov (United States)

    Syafiq, Muhammad; Nasution, Aulia M. T.

    2016-11-01

    Image obtained by the LED with wavelength 740nm and 810nm showed that the contrast gradient of vein pattern is low and palm pattern still exist. It means that 740nm and 810nm are less suitable for the detection of blood vessels in the palm of the hand. At a wavelength of 940nm, the pattern is clearly visible, and the pattern of the palms is mostly gone. Furthermore, the pre-processing performed using smoothing process which include Gaussian filter and median filter and contrast stretching. Image segmentation is done by getting the ROI area that would be obtained its information. The identification process of image features obtained by using MSE (Mean Suare Error) method ,LBP (Local Binary Pattern). Furthermore, we will use a database consists of 5 different palm vein pattern which will be used for testing the tool in the identification process. All the process above are done using Raspberry Pi device. The Obtained MSE parameter is 0.025 and LBP features score are less than 10-3 for image to be matched.

  15. Advantages of using volar vein repair in finger replantations.

    Science.gov (United States)

    Mersa, Berkan; Kabakas, Fatih; Pürisa, Hüsrev; Özçelik, Ismail Bülent; Yeşiloğlu, Nebil; Sezer, Ilker; Tunçer, Serdar

    2014-01-01

    Providing adequate venous outflow is essential in finger replantation surgeries. For a successful result, the quality and quantity of venous repairs should be adequate to drain arterial inflow. The digital dorsal venous plexus is a reliable source of material for venous repairs. Classically, volar digital veins have been used only when no other alternative was available. However, repairing volar veins to augment venous outflow has a number of technical advantages and gives a greater chance of survival. Increasing the repaired vein:artery ratio also increases the success of replantation. The volar skin, covering the volar vein, is less likely to be avulsed during injury and is also less likely to turn necrotic, than dorsal skin, after the replantation surgery. Primary repair of dorsal veins can be difficult due to tightness ensuing from arthrodesis of the underlying joint in flexion. In multiple finger replantations, repairing the volar veins after arterial repair and continuing to do so for each finger in the same way without changing the position of the hand and surgeon save time. In amputations with tissue loss, the size discrepancy is less for volar veins than for dorsal veins. We present the results of 366 finger replantations after volar vein repairs.

  16. Palm Vein Verification Using Multiple Features and Locality Preserving Projections

    Directory of Open Access Journals (Sweden)

    Ali Mohsin Al-juboori

    2014-01-01

    Full Text Available Biometrics is defined as identifying people by their physiological characteristic, such as iris pattern, fingerprint, and face, or by some aspects of their behavior, such as voice, signature, and gesture. Considerable attention has been drawn on these issues during the last several decades. And many biometric systems for commercial applications have been successfully developed. Recently, the vein pattern biometric becomes increasingly attractive for its uniqueness, stability, and noninvasiveness. A vein pattern is the physical distribution structure of the blood vessels underneath a person’s skin. The palm vein pattern is very ganglion and it shows a huge number of vessels. The attitude of the palm vein vessels stays in the same location for the whole life and its pattern is definitely unique. In our work, the matching filter method is proposed for the palm vein image enhancement. New palm vein features extraction methods, global feature extracted based on wavelet coefficients and locality preserving projections (WLPP, and local feature based on local binary pattern variance and locality preserving projections (LBPV_LPP have been proposed. Finally, the nearest neighbour matching method has been proposed that verified the test palm vein images. The experimental result shows that the EER to the proposed method is 0.1378%.

  17. Palm vein verification using multiple features and locality preserving projections.

    Science.gov (United States)

    Al-Juboori, Ali Mohsin; Bu, Wei; Wu, Xiangqian; Zhao, Qiushi

    2014-01-01

    Biometrics is defined as identifying people by their physiological characteristic, such as iris pattern, fingerprint, and face, or by some aspects of their behavior, such as voice, signature, and gesture. Considerable attention has been drawn on these issues during the last several decades. And many biometric systems for commercial applications have been successfully developed. Recently, the vein pattern biometric becomes increasingly attractive for its uniqueness, stability, and noninvasiveness. A vein pattern is the physical distribution structure of the blood vessels underneath a person's skin. The palm vein pattern is very ganglion and it shows a huge number of vessels. The attitude of the palm vein vessels stays in the same location for the whole life and its pattern is definitely unique. In our work, the matching filter method is proposed for the palm vein image enhancement. New palm vein features extraction methods, global feature extracted based on wavelet coefficients and locality preserving projections (WLPP), and local feature based on local binary pattern variance and locality preserving projections (LBPV_LPP) have been proposed. Finally, the nearest neighbour matching method has been proposed that verified the test palm vein images. The experimental result shows that the EER to the proposed method is 0.1378%.

  18. Automated detection of periventricular veins on 7 T brain MRI

    Science.gov (United States)

    Kuijf, Hugo J.; Bouvy, Willem H.; Zwanenburg, Jaco J. M.; Viergever, Max A.; Biessels, Geert Jan; Vincken, Koen L.

    2015-03-01

    Cerebral small vessel disease is common in elderly persons and a leading cause of cognitive decline, dementia, and acute stroke. With the introduction of ultra-high field strength 7.0T MRI, it is possible to visualize small vessels in the brain. In this work, a proof-of-principle study is conducted to assess the feasibility of automatically detecting periventricular veins. Periventricular veins are organized in a fan-pattern and drain venous blood from the brain towards the caudate vein of Schlesinger, which is situated along the lateral ventricles. Just outside this vein, a region-of- interest (ROI) through which all periventricular veins must cross is defined. Within this ROI, a combination of the vesselness filter, tubular tracking, and hysteresis thresholding is applied to locate periventricular veins. All detected locations were evaluated by an expert human observer. The results showed a positive predictive value of 88% and a sensitivity of 95% for detecting periventricular veins. The proposed method shows good results in detecting periventricular veins in the brain on 7.0T MR images. Compared to previous works, that only use a 1D or 2D ROI and limited image processing, our work presents a more comprehensive definition of the ROI, advanced image processing techniques to detect periventricular veins, and a quantitative analysis of the performance. The results of this proof-of-principle study are promising and will be used to assess periventricular veins on 7.0T brain MRI.

  19. Deep vein thrombosis.

    Science.gov (United States)

    Bandyopadhyay, Gargi; Roy, Subesha Basu; Haldar, Swaraj; Bhattacharya, Rabindra

    2010-12-01

    Occlusive clot formation in the veins causes venous thrombosis, the site most common in the deep veins of leg, called deep vein thrombosis. The clot can block blood flow and when it breaks off, called an embolism which in turn can damage the vital organs. Venous thrombosis occurs via three mechanisms ie, Virchow's triad. The mechanisms are decreased flow rate of blood, damage to the blood vessel wall and an increased tendency of the blood to clot. There are several factors which can increase a person's risk for deep vein thrombosis. The symptoms of deep vein thrombosis in the legs are pain, swelling and redness of the part. One variety of venous thrombosis is phlegmasia alba dolens where the leg becomes pale and cool. Investigations include Doppler ultrasound examination of the limb, D-dimer blood test, plethysmography of the legs, x-rays to show vein in the affected area (venography). Hospitalisation is necessary in some cases with some risk factors. The mainstream of treatment is with anticoagulants, mostly low molecular weight heparin for 6 months. Deep venous thrombosis is a rising problem. Early diagnosis and treatment is associated with a good prognosis.

  20. Mesenteric vein thrombosis: CT identification

    Energy Technology Data Exchange (ETDEWEB)

    Rosen, A.; Korobkin, M.; Silverman, P.M.; Dunnick, N.R.; Kelvin, F.M.

    1984-07-01

    Superior mesenteric vein thrombosis was identified on computed tomographic scans in six patients. In each case, contrast-enhanced scans showed a high-density superior mesenteric vein wall surrounding a central filling defect. Four fo the six patients had isolated superior mesenteric vein thrombosis. A fifth patient had associated portal vein and splenic vein thrombosis, and the sixth patient had associated portal vein and inferior vena cava thrombosis. One of the six patients had acute ischemic bowel disease. The other five patients did not have acute ischemic bowel symptoms associated with their venous occlusion. This study defines the computed tomographic appearance of mesenteric vein thrombosis.

  1. Application Effects of Pushing Cannula with Single Hand for Puncturing the Outer Periphery Su-perficial Veins to Indwell the Cannula in Pediatrics%单手送管在儿科留置针穿刺置管中的应用效果

    Institute of Scientific and Technical Information of China (English)

    高明春; 张倩; 李平; 杨苹; 李玲

    2014-01-01

    目的:探讨单手送管在儿科留置针穿刺置管中的应用效果.方法将2012年9月至2013年9月862例行外周浅静脉留置针穿刺的患儿采用随机数字表分为两组,观察组采用单手送管,对照组采用双手送管.比较两组患儿的一次穿刺成功率、留置针留置时间、穿刺时需助手配合率、家属及穿刺者满意度.结果观察组患儿一次穿刺成功率(93.49%)、患儿亲属满意度(97.21%)、穿刺者满意度(98.37%)均高于对照组,穿刺时需助手配合率(17.21%)低于对照组,差异均有统计学意义(P<0.05或P<0.01);两组留置针留置时间差异无统计学意义(P>0.05).结论采用单手送管技术进行留置针穿刺,提高了穿刺成功率和患儿亲属满意度,提高了工作效率,适宜在儿科推广应用.%Objective To investigate the application effect of pushing cannula with single hand for punctu-ring the outer periphery superficial veins to indwell the cannula in pediatrics.Methods 862 sick children who were punctured the outer periphery superficial veins to indwell the cannula were randomly divided into two groups.Observation group wasd use the technique of pushing cannula with single hand.Control group was used the technique of pushing cannula with both hands.One time success rate,indwelling time,assis-tant required rate and family satisfaction rate were compared between two groups.Results The one time puncture success rate (93.49%),the satisfactory rate of sick children relatives(97.21%)and puncturing nurses (98.37%)in observation group were all significantly higher than those in control group.The number of assistant needed (17.21%)when puncturing significantly reduced in observation group (P0.05 ).Conclusion Pushing cannula with single hand for puncturing the outer periphery superficial veins to indwell the cannula can improve the satisfaction of sick children relatives and punctu-ring nurses,and work efficiency,so it

  2. Hand Anatomy

    Science.gov (United States)

    ... Z Videos Infographics Symptom Picker Anatomy Bones Joints Muscles Nerves Vessels Tendons About Hand Surgery What is a Hand Surgeon? What is a Hand Therapist? Media Find a Hand Surgeon Home Anatomy Bones Joints Muscles Nerves Vessels Tendons Anatomy The upper extremity is ...

  3. Android Hands

    DEFF Research Database (Denmark)

    Vlachos, Evgenios; Schärfe, Henrik

    2014-01-01

    . On such occasions, android and humanoid hand models should have similar structure, functions, and performance as the human hand. In this paper we present the anatomy, and the key functionalities of the human hand followed by a literature review on android/humanoid hands for grasping and manipulating objects...

  4. The pattern of skeletal anomalies in the cervical spine, hands and feet in patients with Saethre-Chotzen syndrome and Muenke-type mutation

    Energy Technology Data Exchange (ETDEWEB)

    Trusen, Andreas; Beissert, Matthias; Darge, Kassa [Department of Paediatric Radiology, Institute of Radiodiagnostics, University of Wuerzburg, Josef-Schneider-Str. 2, 97080 Wuerzburg (Germany); Collmann, Hartmut [Department of Paediatric Neurosurgery, University of Wuerzburg, Wuerzburg (Germany)

    2003-03-01

    Saethre-Chotzen syndrome (SCS) and Muenke-type mutation (MTM) are complex syndromes with craniosynostosis and skeletal anomalies including syndactyly, carpal and tarsal fusions, and cervical spine abnormalities. In this study, we analysed radiographs of the cervical spine, hands and feet of a large patient population with genetically proven SCS and MTM. The aim was to describe the pattern of skeletal anomalies and to determine whether specific features are present that could help differentiate between the two entities. Radiographs of 43 patients (23 males, 20 females) with SCS (n=35) or MTM (n=8) were evaluated. The median age was 8 years (range 1 month-36 years). All radiographs were reviewed by two radiologists. In the hands and feet, a variety of anomalies such as brachyphalangy, clinodactyly, partial syndactyly, partial carpal or tarsal fusion, and cone-shaped epiphyses were noted. Duplicated distal phalanx of the hallux (n=12/35) and triangular deformity of the epiphysis of the distal phalanx of the hallux (n=10/35) were detected in SCS only; calcaneo-cuboid fusion (n=2/35) was detected in MTM only. In the cervical spine, fusion of vertebral bodies and/or the posterior elements occurred only in patients with SCS. Pathognomonic signs for SCS are the triangular shape of the epiphysis and duplicated distal phalanx of the hallux. Calcaneo-cuboid fusion was detected in MTM only. These signs may be helpful in the differentiation of SCS from MTM. (orig.)

  5. Prevalence, Patterns, and Clinical Predictors of Left Ventricular Late Gadolinium Enhancement in Patients Undergoing Cardiac Magnetic Resonance Prior to Pulmonary Vein Antral Isolation for Atrial Fibrillation: A Cross-Sectional Observational Study.

    Science.gov (United States)

    Nance, John W; Khurram, Irfan M; Nazarian, Saman; DeWire, Jane; Calkins, Hugh; Zimmerman, Stefan L

    2015-09-01

    Cardiac magnetic resonance (CMR) imaging is increasingly used to evaluate patients with atrial fibrillation (AF) before pulmonary vein antral isolation (PVAI). The purpose of this study was to assess the incidence and pattern of left ventricular (LV) late gadolinium enhancement (LGE) in patients undergoing CMR before PVAI and compare the clinical and demographic differences of patients with and without LV LGE. Clinical and demographic data on 62 patients (mean age 61 ± 7.9, 69% male) undergoing CMR before PVAI for AF were collected. Two observers, masked to clinical histories, independently recorded the prevalence, extent (number of myocardial segments), and pattern (subendocardial, midmyocardial, or subepicardial) of LV LGE in each patient. Clinical and demographic predictors of LV LGE were determined using logistic regression. Twenty-three patients (37%) demonstrated LV LGE affecting a mean of 3.0 ± 2.1 myocardial segments. There was no difference in LV ejection fraction between patients with and without LGE, and most (65%) patients with LGE had normal wall motion. Only age (P = 0.04) and a history of congestive heart failure (P = .03) were statistically significant independent predictors of LGE. The most common LGE pattern was midmyocardial, seen in 17 of 23 (74%) patients. Only 4 of 23 (17%) patients had LGE in an "expected" pattern based on clinical history. Of the remaining 19 patients, 4 had known congestive heart failure, 5 nonischemic cardiomyopathy, 4 known coronary artery disease, and 2 prior aortic valve replacement. Six of 23 (26%) patients had no known coronary artery, valvular, or myocardial disease. There is a high prevalence of unexpected LV scar in patients undergoing CMR before PVAI for AF, with most patients demonstrating a nonischemic pattern of LV LGE and no wall motion abnormalities (ie, subclinical disease). The high prevalence of unexpected LGE in these patients may argue for CMR as the modality of choice for imaging

  6. Finger-vein image recognition combining modified Hausdorff distance with minutiae feature matching.

    Science.gov (United States)

    Yu, Cheng-Bo; Qin, Hua-Feng; Cui, Yan-Zhe; Hu, Xiao-Qian

    2009-12-01

    In this paper, we propose a novel method for finger-vein recognition. We extract the features of the vein patterns for recognition. Then, the minutiae features included bifurcation points and ending points are extracted from these vein patterns. These feature points are used as a geometric representation of the vein patterns shape. Finally, the modified Hausdorff distance algorithm is provided to evaluate the identification ability among all possible relative positions of the vein patterns shape. This algorithm has been widely used for comparing point sets or edge maps since it does not require point correspondence. Experimental results show that these minutiae feature points can be used to perform personal verification tasks as a geometric representation of the vein patterns shape. Furthermore, by this developed method, we can achieve robust image matching under different lighting conditions.

  7. Infrared venography of the hand in Apert syndrome

    Directory of Open Access Journals (Sweden)

    Soh Nishimoto

    2013-01-01

    Full Text Available As well as craniofacial synostosis, complex syndactyly of hands is a distinctive feature of Apert syndrome. Consideration of blood flow to the digits is very important in separation surgery. Several reports offer information about arterial distribution in Apert′s hands. Though, venous pattern has not been well discussed. Infrared venography offers a real-time image with minimal invasion. An Apert syndrome patient underwent a series of finger splitting surgeries. Infrared venography was carried out to assess veins. There was a palmar venous arch, placing distally to the metacarpophalangeal joint. The arch had to be cut to divide fused fingers sufficiently. As well as arterial abnormality, venous uniqueness should be noted in Apert syndactyly surgeries. Infrared venography, which can be carried out easily, offers good information that surgeon require.

  8. Hand Fractures

    Science.gov (United States)

    ... Z Videos Infographics Symptom Picker Anatomy Bones Joints Muscles Nerves Vessels Tendons About Hand Surgery What is a Hand Surgeon? What is ... serve as a framework. This framework supports the muscles that make the wrist ... When one of these hand bones is broken (fractured), it can prevent you ...

  9. Deep Vein Thrombosis

    Centers for Disease Control (CDC) Podcasts

    2012-04-05

    This podcast discusses the risk for deep vein thrombosis in long-distance travelers and ways to minimize that risk.  Created: 4/5/2012 by National Center for Emerging and Zoonotic Infectious Diseases (NCEZID).   Date Released: 4/5/2012.

  10. Retinal vein occlusion

    Science.gov (United States)

    ... decrease the risk of retinal vein occlusion. These measures include: Eating a low-fat diet Getting regular exercise Maintaining an ideal weight Not smoking Aspirin or other blood thinners may help prevent blockages in the other eye. Controlling diabetes may ...

  11. The vein collar

    DEFF Research Database (Denmark)

    Lundgren, F; Schroeder, Torben Veith

    2012-01-01

    Randomized studies evaluating the effect of a vein collar at the distal anastomosis of PTFE-grafts show conflicting results. The study of the Joint Vascular Research Group (JVRG) of UK found improved primary patency while the Scandinavian Miller Collar Study (SCAMICOS) found neither any effect...

  12. Deep Vein Thrombosis

    African Journals Online (AJOL)

    OWNER

    Il s'agissait de la main et les recherches en ligne. Des termes ..... Cerrato D, Ariano G, and Fiacchino F : Deep vein ... Surg 1988; 75: 1053–7. 19. Salzman ... Alikhan R, Cohen AT, Combe S, Samama .... Kakkar AK, Williamson RCN. Thrombo.

  13. [Ovarian vein syndrome].

    Science.gov (United States)

    Ferrero Doria, R; Guzmán Valls, P; López Alba, J; Tomás Ros, M; Rico Galiano, J L; Fontana Compiano, L O

    1996-04-01

    The Ovarian Vein Syndrome has been the subject of controversy ever since first described as such by Clark in 1964. This is an uncommon entity within urologic sings and symptoms which appears as a recurrent nephritic colic coinciding with menstruation or during the immediately preceding days. The authors review a clinical case from our Urology Service, including some considerations on the case.

  14. Cucumber vein yellowing virus

    Science.gov (United States)

    Cucurbits are an important crop of temperate, subtropical and tropical regions of the world. Cucumber vein yellowing virus (CVYV) is a major viral pathogen of cucurbits. This chapter provides an overview of the biology of CVYV and the disease it causes....

  15. Squash vein yellowing virus

    Science.gov (United States)

    Cucurbits are an important crop of temperate, subtropical and tropical regions of the world. Squash vein yellowing virus (SqVYV) is a major viral pathogen of cucurbits. This chapter provides an overview of the biology of SqVYV and the disease it causes....

  16. Endovenous treatments for varicose veins

    NARCIS (Netherlands)

    R.R. van den Bos (Renate)

    2011-01-01

    textabstractEndovenous treatment is currently one of the most frequently used methods for treating varicose veins in the Netherlands. Varicose veins are tortuous and enlarged veins due to weakening in the vein’s wall or valves. They are manifestations of chronic venous disease (CVD), which may lead

  17. Autogenous Sapheonus Vein Graft Interposition in Arteriovenous Fistula Formation

    Directory of Open Access Journals (Sweden)

    Alper Uzun

    2013-10-01

    Full Text Available Aim: Other techniques are required due to the negative influence of poor superficial venous system calibration (<1.5-2 mm to the long term patency of the arteriovenous fistula which is documented via preoperative Doppler ultrasound examination. The postoperative outcome of 32 patients were compared prospectively whom autologous saphenous vein bridge graft was interposed between brachial artery/high brachial vein and radial artery/basilic vein. Material and Method: Patients were divided into two groups; patients whom radial artery/basilic vein autologous saphenous vein graft interposition was performed were labelled as Group 1 (17 patients while patients whom brachial artery/high brachial vein autologous saphenous vein graft was interpositioned were labelled as Group 2 (15 patients. Patients were followed up for 12 months. Graft related complications were recorded. Primary and secondary patency rate were calculated. Results: Graft infection, edema or ischemia of the hand or arm, congestive heart failure and mortality was not observed. There was not a significant difference in puncture site complications between two groups. Primary patency rate was 76.5% (13 of 17 in Group 1 while it was 93.3% (14 of 15 for Group 2 (p=0,185. Secondary patency rate was 82.4% (14 of 17 in Group1 and 100% (15 of 15 for Group 2 (p=0.093. Primary and secondary patency rate were similar between two groups. Discussion: We sought to compare the complication and patency rate of the proximal (brachial artery/high brachial vein and distal (radial artery/basilic vein located bridge graft interpositions and could not found statistical difference between two groups. It is reasonable to keep proximal regions for further interventions, so radial artery/basilic vein bridge graft interposition can be recommended as the initial option according to our findings.

  18. Using an autologistic regression model to identify spatial risk factors and spatial risk patterns of hand, foot and mouth disease (HFMD) in Mainland China.

    Science.gov (United States)

    Bo, Yan-Chen; Song, Chao; Wang, Jin-Feng; Li, Xiao-Wen

    2014-04-14

    There have been large-scale outbreaks of hand, foot and mouth disease (HFMD) in Mainland China over the last decade. These events varied greatly across the country. It is necessary to identify the spatial risk factors and spatial distribution patterns of HFMD for public health control and prevention. Climate risk factors associated with HFMD occurrence have been recognized. However, few studies discussed the socio-economic determinants of HFMD risk at a space scale. HFMD records in Mainland China in May 2008 were collected. Both climate and socio-economic factors were selected as potential risk exposures of HFMD. Odds ratio (OR) was used to identify the spatial risk factors. A spatial autologistic regression model was employed to get OR values of each exposures and model the spatial distribution patterns of HFMD risk. Results showed that both climate and socio-economic variables were spatial risk factors for HFMD transmission in Mainland China. The statistically significant risk factors are monthly average precipitation (OR = 1.4354), monthly average temperature (OR = 1.379), monthly average wind speed (OR = 1.186), the number of industrial enterprises above designated size (OR = 17.699), the population density (OR = 1.953), and the proportion of student population (OR = 1.286). The spatial autologistic regression model has a good goodness of fit (ROC = 0.817) and prediction accuracy (Correct ratio = 78.45%) of HFMD occurrence. The autologistic regression model also reduces the contribution of the residual term in the ordinary logistic regression model significantly, from 17.25 to 1.25 for the odds ratio. Based on the prediction results of the spatial model, we obtained a map of the probability of HFMD occurrence that shows the spatial distribution pattern and local epidemic risk over Mainland China. The autologistic regression model was used to identify spatial risk factors and model spatial risk patterns of HFMD. HFMD occurrences were found to be spatially

  19. Varicosity of the pulmonary veins

    Energy Technology Data Exchange (ETDEWEB)

    Leicher-Dueber, A.; Lindner, P.; Schild, H.; Plewe, G.

    1986-04-01

    Varicosity of the pulmonary veins is a rare anomaly of the pulmonary vascular system. The varices do not usually change in size over years, do not cause symptoms and need no therapy. However, raised left atrial pressure can cause increase in the diameter of pulmonary vein varices. A case of lung vein varicosity in the right middle and upper lobe associated with coarctation of the aorta and an anomalous upper-middle lobe vein was observed over a period of 10 years. Increase in left atrial pressure (aortic and relative mitral regurgitation) led to enlargement of the pulmonary veins.

  20. Plantar vein thrombosis: a rare cause of plantar foot pain

    Energy Technology Data Exchange (ETDEWEB)

    Siegal, Daniel S.; Wu, Jim S.; Brennan, Darren D.; Hochman, Mary G. [Beth Israel Deaconess Medical Center, Department of Radiology, Boston, MA (United States); Challies, Tracy [Beth Israel Deaconess Medical Center, Department of Pathology, Boston, MA (United States)

    2008-03-15

    Plantar vein thrombosis is a rare condition, with only a handful of cases reported in the literature. The cause is unknown; however, the disease has been attributed to prior surgery, trauma, and paraneoplastic conditions. We present a case of a 32-year-old female runner with plantar vein thrombosis diagnosed on contrast-enhanced MRI and confirmed on ultrasound. The symptoms resolved with conservative treatment and evaluation revealed the presence of a prothrombin gene mutation and use of oral contraceptive pills. To our knowledge, this is the first case of plantar vein thrombosis diagnosed initially by MRI. Moreover, this case suggests that plantar vein thrombosis should be considered in patients with hypercoagulable states and plantar foot pain. (orig.)

  1. 握指式手背静脉穿刺在老年患者中的护理效果研究%Is Refers to the Type of Hand Vein Puncture in Research on Nursing Ef-fect in Elderly Patients

    Institute of Scientific and Technical Information of China (English)

    左莉芳

    2016-01-01

    Objective To study the nursing effect of hand hand vein puncture in elderly patients. Methods Selected our hospital in September 2014 to 2015 August during the 300 elderly hospitalized patients, according to the venous trans-fusion date order points for 150 cases in each group. The observation group and the control group, take grip means and fist of all patients were punctured, the 5.5 scalp needle for hand vein puncture, the observation group application grip refers to the type of venous puncture. Control group used fist style of venous puncture and control two group of puncture of satisfaction degree and puncture a success probability. Results The observation group with grip means of patients with venous puncture success rate was 95%, control group used the fist style of patients with venous puncture success-ful rate was 75%, the satisfaction of the two groups of venous puncture were 93% and 84%, compared to the two sets of results P < 0.05, showing the difference with statistical significance. Conclusion It is easier to achieve success by us-ing finger manipulation in nursing, and it can improve patient satisfaction.%目的:研究握指式手背静脉穿刺在老年患者中的护理效果。方法选取该院2014年9月―2015年8月期间的300例老年住院患者,按静脉输液日期顺序分为每组150例的观察组和对照组,采取握指式和握拳式对全部患者进行穿刺,采用5.5号头皮针进行手背静脉穿刺,观察组应用握指式进行静脉穿刺,对照组应用握拳式进行静脉穿刺,对照两组穿刺的满意程度和穿刺一次成功的几率。结果观察组采用握指式对患者进行静脉穿刺的成功率是95%,对照组采用握拳式对患者进行静脉穿刺的成功率是75%,两组静脉穿刺的满意程度分别是93%和84%,对比两组结果P﹤0.05,显示的差异有统计学意义。结论在护理中采用握指式手法对患者进行静脉穿刺更容易取得成功,而且能

  2. Hand Eczema

    NARCIS (Netherlands)

    Coenraads, Pieter-Jan

    2012-01-01

    A 33-year-old woman presents with redness of the hands and reports the intermittent occurrence of tiny vesicles, scaling, and fissuring, accompanied by itching on the palms, fingers, and dorsal sides of the hands. She has two young children and works as a nurse in a nearby hospital. She has a histor

  3. Dissociated small hand muscle atrophy in aging: the 'senile hand' is a split hand.

    NARCIS (Netherlands)

    Voermans, N.C.; Schelhaas, H.J.; Munneke, M.; Zwarts, M.J.

    2006-01-01

    The term 'split hand' refers to a pattern of dissociated atrophy of hand muscles and was first described in ALS. We hypothesize that this phenomenon also occurs in 'normal' aging. We investigated healthy subjects of different ages and found a progressive dissociation in atrophy of the hand muscles,

  4. Hand preference, performance abilities and hand selection in children

    Directory of Open Access Journals (Sweden)

    Sara Marie Scharoun

    2014-02-01

    Full Text Available It is widely know that the pattern of human handedness is such that approximately 90% of the population is right handed with the remainder being left handed, at least in the adult population. What is less well understood is how handedness develops and at what age adult-like handedness patterns emerge. Quantified in terms of both preference and performance, a plethora of different behavioural assessments are currently in use with both children and adults. Handedness questionnaires are commonly used; however, these possess inherent limitations, considering their subjective nature. Hand performance measures have also been implemented; however, such tasks appear to measure different components of handedness. In addition to these traditional measures, handedness has been successfully assessed through observation of hand selection in reaching, which has proven to be a unique and effective manner in understanding the development of handedness in children. Research over the past several decades has demonstrated that young children display weak, inconsistent hand preference tendencies and are slower with both hands. Performance differences between the hands are larger for young children, and consistency improves with age. However, there remains some controversy surrounding the age at which hand preference and hand performance abilities can be considered fully developed. The following paper will provide a review of the literature pertaining to hand preference, performance abilities and hand selection in children in an attempt to ascertain the age at which adult-like patterns of hand preference and performance emerge.

  5. Portal vein arterialization increases hepatocellular apoptosis and inhibits liver regeneration.

    Science.gov (United States)

    Schleimer, Karina; Stippel, Dirk L; Kasper, Hans U; Prenzel, Klaus; Gaudig, Cindy; Tawadros, Samir; Hoelscher, Arnulf H; Beckurts, K Tobias E

    2008-10-01

    Portal vein arterialization is performed in particular situations to guarantee sufficient blood flow in the portal vein. In addition, some authors have postulated a proliferation-promoting influence of portal vein arterialization on the liver tissue. However, portal vein arterialization is an unphysiological procedure: It increases portal blood flow and blood pressure as well as oxygenation of the liver tissue. On the other hand, it reduces the influx of hepatotrophic factors from the portal venous blood. The aim of these experiments was to investigate apoptosis and proliferation of hepatocytes during various conditions of the portal perfusion. After 70% liver resection in Lewis rats, the following four experimental groups were formed differing in portal perfusion: (I) hyperperfused, nonarterialized; (II) flow-regulated, nonarterialized; (III) hyperperfused, arterialized; (IV) flow-regulated, arterialized. A warm ischemia of 30 min was kept in all groups. Portal vein arterialization of 70% reduced rat livers significantly reduced liver regeneration as shown by a significant reduction in liver weight, body weight, and liver function after 6 wk, in contrast to the group with 70% liver mass reduction and portal venous inflow of the portal vein. Furthermore, we found a significantly elevated number of apoptotic hepatocytes after portal vein arterialization. These results were independent from blood flow regulation of the arterialized portal vein, which caused no improvement of the results. Portal vein arterialization should be performed only temporarily and is clinically not recommended as a permanent option, because of the increased hepatocellular apoptosis and the very distinctive, negative long-term effects on liver weight.

  6. 使用方向滤波技术的手指静脉纹路提取方法%Finger vein pattern extraction method using oriented filtering technology

    Institute of Scientific and Technical Information of China (English)

    王科俊; 马慧; 李雪峰; 管凤旭; 刘靖宇

    2011-01-01

    To extract finger vein features effectively and efficiently, a novel algorithm based on oriented filter for finger vein extraction is proposed. According to the characteristics of finger vein, the proposed algorithm generates a directional image of the finger vein image and a group of oriented filters, with which to filter the image depending on the orientation of the local ridge. Finally, finger vein feature is extracted from the enhanced image. Our method extends traditional image segmentation methods, by extracting vein object from the oriented filter enhanced image. Experimental results show that, apart from smoothness and continuity or removal of noise and pseudo-vein characteristics, the method proposed in this paper extracts vein features effectively not only from the high-quality images but also from the low-quality vein images.%为了准确高效地提取手指静脉纹路,提出一种新的基于方向滤波的手指静脉纹路提取方法.该方法结合静脉纹路特点设计手指静脉图像的方向图及方向滤波器,根据所得的方向图及方向滤波器对图像进行滤波增强,对增强后的图像提取手指静脉模式.与传统的二值化方法相比,在进行二值化操作前,先对图像进行方向滤波处理,使得该方法提取出的手指静脉纹路连通性与光滑性好、噪声与伪特征少,且其不仅对高质量图像能够准确有效地提取出静脉纹路,对低质量图像处理效果也比较理想.

  7. Retroaortic left renal vein joining the left common iliac vein

    Energy Technology Data Exchange (ETDEWEB)

    Brancatelli, G.; Galia, M.; Finazzo, M.; Sparacia, G.; Pardo, S.; Lagalla, R. [Dept. of Radiology ' ' P. Cignolini' ' , Univ. of Palermo (Italy)

    2000-11-01

    Retroaortic left renal vein joining the left common iliac vein is a rare congenital anomaly in the development of the inferior vena cava. To our knowledge, only one case has been reported in the literature; however, its imaging features have never been described. A 27-year-old male presented with a 1-year history of recurrent right flank pain, dysuria, hematuria, and fever (39 C). Computed tomography and MR venography showed a retroaortic left renal vein joining the left common iliac vein. We present the CT and MR venography findings and discuss their feasibility in showing this congenital anomaly. (orig.)

  8. Cranial dural arteriovenous shunts. Part 1. Anatomy and embryology of the bridging and emissary veins.

    Science.gov (United States)

    Baltsavias, Gerasimos; Parthasarathi, Venkatraman; Aydin, Emre; Al Schameri, Rahman A; Roth, Peter; Valavanis, Anton

    2015-04-01

    We reviewed the anatomy and embryology of the bridging and emissary veins aiming to elucidate aspects related to the cranial dural arteriovenous fistulae. Data from relevant articles on the anatomy and embryology of the bridging and emissary veins were identified using one electronic database, supplemented by data from selected reference texts. Persisting fetal pial-arachnoidal veins correspond to the adult bridging veins. Relevant embryologic descriptions are based on the classic scheme of five divisions of the brain (telencephalon, diencephalon, mesencephalon, metencephalon, myelencephalon). Variation in their exact position and the number of bridging veins is the rule and certain locations, particularly that of the anterior cranial fossa and lower posterior cranial fossa are often neglected in prior descriptions. The distal segment of a bridging vein is part of the dural system and can be primarily involved in cranial dural arteriovenous lesions by constituting the actual site of the shunt. The veins in the lamina cribriformis exhibit a bridging-emissary vein pattern similar to the spinal configuration. The emissary veins connect the dural venous system with the extracranial venous system and are often involved in dural arteriovenous lesions. Cranial dural shunts may develop in three distinct areas of the cranial venous system: the dural sinuses and their interfaces with bridging veins and emissary veins. The exact site of the lesion may dictate the arterial feeders and original venous drainage pattern.

  9. Internal vein texture and vein evolution of the epithermal Shila-Paula district, southern Peru

    Science.gov (United States)

    Chauvet, Alain; Bailly, Laurent; André, Anne-Sylvie; Monié, Patrick; Cassard, Daniel; Tajada, Fernando Llosa; Vargas, Juan Rosas; Tuduri, Johann

    2006-07-01

    The epithermal Shila-Paula Au-Ag district is characterized by numerous veins hosted in Tertiary volcanic rocks of the Western Cordillera (southern Peru). Field studies of the ore bodies reveal a systematic association of a main E-W vein with secondary N55-60°W veins—two directions that are also reflected by the orientation of fluid-inclusion planes in quartz crystals of the host rock. In areas where this pattern is not recognized, such as the Apacheta sector, vein emplacement seems to have been guided by regional N40°E and N40°W fractures. Two main vein-filling stages are identified. stage 1 is a quartz-adularia-pyrite-galena-sphalerite-chalcopyrite-electrum-Mn silicate-carbonate assemblage that fills the main E-W veins. stage 2, which contains most of the precious-metal mineralization, is divided into pre-bonanza and bonanza substages. The pre-bonanza substage consists of a quartz-adularia-carbonate assemblage that is observed within the secondary N45-60°W veins, in veinlets that cut the stage 1 assemblage, and in final open-space fillings. The two latter structures are finally filled by the bonanza substage characterized by a Fe-poor sphalerite-chalcopyrite-pyrite-galena-tennantite-tetrahedrite-polybasite-pearceite-electrum assemblage. The ore in the main veins is systematically brecciated, whereas the ore in the secondary veins and geodes is characteristic of open-space crystallization. Microthermometric measurements on sphalerite from both stages and on quartz and calcite from stage 2 indicate a salinity range of 0 to 15.5 wt% NaCl equivalent and homogenization temperatures bracketed between 200 and 330°C. Secondary CO2-, N2- and H2S-bearing fluid inclusions are also identified. The age of vein emplacement, based on 40Ar/39Ar ages obtained on adularia of different veins, is estimated at around 11 Ma, with some overlap between adularia of stage 1 (11.4±0.4 Ma) and of stage 2 (10.8±0.3 Ma). A three-phase tectonic model has been constructed to explain the

  10. A heart-hand syndrome gene: Tfap2b plays a critical role in the development and remodeling of mouse ductus arteriosus and limb patterning.

    Directory of Open Access Journals (Sweden)

    Feng Zhao

    Full Text Available BACKGROUND: Patent ductus arteriosus (PDA is one of the most common forms of congenital heart disease. Mutations in transcription factor TFAP2B cause Char syndrome, a human disorder characterized by PDA, facial dysmorphysm and hand anomalies. Animal research data are needed to understand the mechanisms. The aim of our study was to elucidate the pathogenesis of Char syndrome at the molecular level. METHODOLOGY/PRINCIPAL FINDINGS: Gene expression of Tfap2b during mouse development was studied, and newborns of Tfap2b-deficient mice were examined to identify phenotypes. Gel shift assays had been carried out to search for Tfap2 downstream genes. Promoters of candidate genes were cloned into a reporter construct and used to demonstrate their regulation by Tfap2b in cell transfection. In situ hybridizations showed that the murine transcription factor Tfap2b was expressed during the entire development of mouse ductus arteriosus. Histological examination of ductus arteriosus from Tfap2b knockout mice 6 hours after birth revealed that they were not closed. Consequently, the lungs of Tfap2b(-/- mice demonstrated progressive congestion of the pulmonary capillaries, which was postulated to result secondarily from PDA. In addition, Tfap2b was expressed in the limb buds, particularly in the posterior limb field during development. Lack of Tfap2b resulted in bilateral postaxial accessory digits. Further study indicated that expressions of bone morphogenetic protein (Bmp genes, which are reported to be involved in the limb patterning and ductal development, were altered in limb buds of Tfap2b-deficient embryos, due to direct control of Bmp2 and Bmp4 promoter activity by Tfap2b. CONCLUSIONS/SIGNIFICANCE: Tfap2b plays important roles in the development of mouse ductus arteriosus and limb patterning. Loss of Tfap2b results in altered Bmp expression that may cause the heart-limb defects observed in Tfap2b mouse mutants and Char syndrome patients. The Tfap2b knockout

  11. Dinâmica temporal e espacial da begomovirose causada por Tomato yellow vein streak virus em tomateiro na região de Campinas-SP Spatio-temporal pattern of a begomovirus disease caused by Tomato yellow vein streak virus in tomato in Campinas region, São Paulo

    Directory of Open Access Journals (Sweden)

    Marilia Gabriela Salveti Della Vecchia

    2007-12-01

    ânea como uma das principais medidas para o manejo da doença.The purpose of the present work was the characterization of the temporal and spatial pattern of Tomato yellow vein streak virus (ToYVSV, transmitted by the whitefly Bemisia tabaci, in tomato crops under field and greenhouse conditions, in Sumaré and Elias Fausto counties, respectively, State of São Paulo, Brazil. A total of 4,032 plants of cultivar Alambra, distributed in eight randomized blocks, were evaluated under field conditions. Evaluations in greenhouses were performed on 6,016 plants of cultivar Ikram. Plants were transplanted into eight greenhouses, in a staggered manner. Evaluations were based on typical symptoms induced by this begomovirus. The identification of the virus species was based on the analysis of the nucleotide sequence of part of the DNA-A (810 bp, which included the AV1 and AC3 genes. The incidence of the disease progressed very slowly under field conditions, coming from a minimum of 0.002 (proportion of symptomatic plants to a maximum of 0.0497. In spite of this, border effect was observed, since the average of diseased plants in the peripheric blocks was 2.1 times higher than in the inner blocks. The disease progress curve was linear, indicating that newer infections were mainly due to the constant influx of viruliferous whiteflies coming from outside sources of inoculum. The percentage of diseased plants in tomatoes grown under greenhouse conditions was enormously influenced by the time of planting, varying from 4.8% to 69.3%. The spatial distribution of symptomatic tomato plants in these crops was aggregated. Apparently, this pattern was not due to secondary infections, but a result of aggregation of diseased plants near the periphery of the greenhouses. Based on these results, it is suggested that the elimination of sources of inoculum represented by old tomato crops and infected weed hosts is one of the most important practices for disease management.

  12. A RARE CASE OF EXTENSIVE THROMBOSIS OF INFERIOR VENA CAVA, PORTAL VEIN, SPLENIC VEIN AND SUPERIOR MESENTRIC VEIN

    Directory of Open Access Journals (Sweden)

    Giridhar

    2015-03-01

    Full Text Available While the most common presentation of venous thromboembolic disease is deep vein thrombosis (DVT or pulmonary thromboembolism, rarer manifestations are thrombosis of jugular vein, cerebral sinus and inferior vena cava. Here we are presenting a rare case of inferior vena caval thrombosis with multiple thrombus in portal vein, splenic vein and superior mesenteric vein

  13. Cephalic vein aneurysm.

    Science.gov (United States)

    Faraj, Walid; Selmo, Francesca; Hindi, Mia; Haddad, Fadi; Khalil, Ismail

    2007-11-01

    Cephalic vein aneurysms are rare malformations that may develop in any part of the vascular system, and their history, presentation, and management vary depending on their site. The etiology of venous aneurysms remains unclear, although several theories have been elaborated. Venous aneurysms are unusual vascular malformations that occur equally between the sexes and are seen at any age; they can present as either a painful or a painless subcutaneous mass. No serious complications have been reported from upper extremity venous aneurysms. Surgical excision is the definitive management for most of these. The case reported here presented with a painless and mobile, soft, subcutaneous mass that caused only cosmetic concern.

  14. Hand eczema.

    Science.gov (United States)

    Agarwal, Uma Shankar; Besarwal, Raj Kumar; Gupta, Rahul; Agarwal, Puneet; Napalia, Sheetal

    2014-05-01

    Hand eczema is often a chronic, multifactorial disease. It is usually related to occupational or routine household activities. Exact etiology of the disease is difficult to determine. It may become severe enough and disabling to many of patients in course of time. An estimated 2-10% of population is likely to develop hand eczema at some point of time during life. It appears to be the most common occupational skin disease, comprising 9-35% of all occupational diseases and up to 80% or more of all occupational contact dermatitis. So, it becomes important to find the exact etiology and classification of the disease and to use the appropriate preventive and treatment measures. Despite its importance in the dermatological practice, very few Indian studies have been done till date to investigate the epidemiological trends, etiology, and treatment options for hand eczema. In this review, we tried to find the etiology, epidemiology, and available treatment modalities for chronic hand eczema patients.

  15. Finger vein verification system based on sparse representation.

    Science.gov (United States)

    Xin, Yang; Liu, Zhi; Zhang, Haixia; Zhang, Hong

    2012-09-01

    Finger vein verification is a promising biometric pattern for personal identification in terms of security and convenience. The recognition performance of this technology heavily relies on the quality of finger vein images and on the recognition algorithm. To achieve efficient recognition performance, a special finger vein imaging device is developed, and a finger vein recognition method based on sparse representation is proposed. The motivation for the proposed method is that finger vein images exhibit a sparse property. In the proposed system, the regions of interest (ROIs) in the finger vein images are segmented and enhanced. Sparse representation and sparsity preserving projection on ROIs are performed to obtain the features. Finally, the features are measured for recognition. An equal error rate of 0.017% was achieved based on the finger vein image database, which contains images that were captured by using the near-IR imaging device that was developed in this study. The experimental results demonstrate that the proposed method is faster and more robust than previous methods.

  16. Preliminary Study for Designing a Novel Vein-Visualizing Device

    Directory of Open Access Journals (Sweden)

    Donghoon Kim

    2017-02-01

    Full Text Available Venipuncture is an important health diagnosis process. Although venipuncture is one of the most commonly performed procedures in medical environments, locating the veins of infants, obese, anemic, or colored patients is still an arduous task even for skilled practitioners. To solve this problem, several devices using infrared light have recently become commercially available. However, such devices for venipuncture share a common drawback, especially when visualizing deep veins or veins of a thick part of the body like the cubital fossa. This paper proposes a new vein-visualizing device applying a new penetration method using near-infrared (NIR light. The light module is attached directly on to the declared area of the skin. Then, NIR beam is rayed from two sides of the light module to the vein with a specific angle. This gives a penetration effect. In addition, through an image processing procedure, the vein structure is enhanced to show it more accurately. Through a phantom study, the most effective penetration angle of the NIR module is decided. Additionally, the feasibility of the device is verified through experiments in vivo. The prototype allows us to visualize the vein patterns of thicker body parts, such as arms.

  17. Preliminary Study for Designing a Novel Vein-Visualizing Device.

    Science.gov (United States)

    Kim, Donghoon; Kim, Yujin; Yoon, Siyeop; Lee, Deukhee

    2017-02-07

    Venipuncture is an important health diagnosis process. Although venipuncture is one of the most commonly performed procedures in medical environments, locating the veins of infants, obese, anemic, or colored patients is still an arduous task even for skilled practitioners. To solve this problem, several devices using infrared light have recently become commercially available. However, such devices for venipuncture share a common drawback, especially when visualizing deep veins or veins of a thick part of the body like the cubital fossa. This paper proposes a new vein-visualizing device applying a new penetration method using near-infrared (NIR) light. The light module is attached directly on to the declared area of the skin. Then, NIR beam is rayed from two sides of the light module to the vein with a specific angle. This gives a penetration effect. In addition, through an image processing procedure, the vein structure is enhanced to show it more accurately. Through a phantom study, the most effective penetration angle of the NIR module is decided. Additionally, the feasibility of the device is verified through experiments in vivo. The prototype allows us to visualize the vein patterns of thicker body parts, such as arms.

  18. Preliminary Study for Designing a Novel Vein-Visualizing Device

    Science.gov (United States)

    Kim, Donghoon; Kim, Yujin; Yoon, Siyeop; Lee, Deukhee

    2017-01-01

    Venipuncture is an important health diagnosis process. Although venipuncture is one of the most commonly performed procedures in medical environments, locating the veins of infants, obese, anemic, or colored patients is still an arduous task even for skilled practitioners. To solve this problem, several devices using infrared light have recently become commercially available. However, such devices for venipuncture share a common drawback, especially when visualizing deep veins or veins of a thick part of the body like the cubital fossa. This paper proposes a new vein-visualizing device applying a new penetration method using near-infrared (NIR) light. The light module is attached directly on to the declared area of the skin. Then, NIR beam is rayed from two sides of the light module to the vein with a specific angle. This gives a penetration effect. In addition, through an image processing procedure, the vein structure is enhanced to show it more accurately. Through a phantom study, the most effective penetration angle of the NIR module is decided. Additionally, the feasibility of the device is verified through experiments in vivo. The prototype allows us to visualize the vein patterns of thicker body parts, such as arms. PMID:28178227

  19. Finger-Vein Image Enhancement Using a Fuzzy-Based Fusion Method with Gabor and Retinex Filtering

    OpenAIRE

    Kwang Yong Shin; Young Ho Park; Dat Tien Nguyen; Kang Ryoung Park

    2014-01-01

    Because of the advantages of finger-vein recognition systems such as live detection and usage as bio-cryptography systems, they can be used to authenticate individual people. However, images of finger-vein patterns are typically unclear because of light scattering by the skin, optical blurring, and motion blurring, which can degrade the performance of finger-vein recognition systems. In response to these issues, a new enhancement method for finger-vein images is proposed. Our method is novel ...

  20. Historical Overview of Varicose Vein Surgery

    NARCIS (Netherlands)

    van den Bremer, Jephta; Moll, Frans L.

    2010-01-01

    Varicose veins are as old as Hippocrates. Varicose vein treatments come and go. Surgery for varicose vein disease is one of the commonest elective general surgical procedures. The history of varicose vein surgery has been traced. We note the first descriptions of varicose veins, and we particularly

  1. Finger Vein Recognition Based on Personalized Weight Maps

    Directory of Open Access Journals (Sweden)

    Lu Yang

    2013-09-01

    Full Text Available Finger vein recognition is a promising biometric recognition technology, which verifies identities via the vein patterns in the fingers. Binary pattern based methods were thoroughly studied in order to cope with the difficulties of extracting the blood vessel network. However, current binary pattern based finger vein matching methods treat every bit of feature codes derived from different image of various individuals as equally important and assign the same weight value to them. In this paper, we propose a finger vein recognition method based on personalized weight maps (PWMs. The different bits have different weight values according to their stabilities in a certain number of training samples from an individual. Firstly we present the concept of PWM, and then propose the finger vein recognition framework, which mainly consists of preprocessing, feature extraction, and matching. Finally, we design extensive experiments to evaluate the effectiveness of our proposal. Experimental results show that PWM achieves not only better performance, but also high robustness and reliability. In addition, PWM can be used as a general framework for binary pattern based recognition.

  2. phenoVein - A software tool for leaf vein segmentation and analysis

    OpenAIRE

    Bühler, Jonas; Rishmawi, Louai; Pflugfelder, Daniel; Huber, Gregor; Scharr, Hanno; Hülskamp, Martin; Koornneef, Maarten; SCHURR, ULRICH; Jahnke, Siegfried

    2015-01-01

    phenoVein is a software tool dedicated to automated segmenting and analyzing images of leaf veins. It includes comfortable manual correction features. Advanced image filtering automatically emphasizes veins from background and compensates for local brightness inhomogeneities. Phenotypical leaf vein traits being calculated are total vein density, vein lengths and widths and skeleton graph statistics. For determination of vein widths, a model based vein edge estimation approach has been impleme...

  3. Finger vein recognition based on finger crease location

    Science.gov (United States)

    Lu, Zhiying; Ding, Shumeng; Yin, Jing

    2016-07-01

    Finger vein recognition technology has significant advantages over other methods in terms of accuracy, uniqueness, and stability, and it has wide promising applications in the field of biometric recognition. We propose using finger creases to locate and extract an object region. Then we use linear fitting to overcome the problem of finger rotation in the plane. The method of modular adaptive histogram equalization (MAHE) is presented to enhance image contrast and reduce computational cost. To extract the finger vein features, we use a fusion method, which can obtain clear and distinguishable vein patterns under different conditions. We used the Hausdorff average distance algorithm to examine the recognition performance of the system. The experimental results demonstrate that MAHE can better balance the recognition accuracy and the expenditure of time compared with three other methods. Our resulting equal error rate throughout the total procedure was 3.268% in a database of 153 finger vein images.

  4. Leiomyosarcoma of the renal vein

    Directory of Open Access Journals (Sweden)

    Lemos Gustavo C.

    2003-01-01

    Full Text Available Leiomyosarcoma of the renal vein is a rare tumor of complex diagnosis. We presented a case of renal vein leiomyosarcoma detected in a routine study. The primary treatment was complete surgical removal of the mass. In cases where surgical removal is not possible the prognosis is poor, with high rates of local recurrence and distant spread.

  5. Agenesis of the iliac veins.

    Science.gov (United States)

    Thomas, M L; Posniak, H V

    1984-01-01

    Three case reports of patients with the rare anomaly of agenesis of the iliac veins are presented. It is emphasised that full phlebographic investigation should be carried out in such patients before surgical treatment is considered. It is pointed out that surgical ablation may exacerbate the symptoms of leg swelling and varicose veins for which the patients seek advice.

  6. Infrared imaging of varicose veins

    Science.gov (United States)

    Noordmans, Herke Jan; de Zeeuw, Raymond; Verdaasdonk, Ruud M.; Wittens, Cees H. A.

    2004-06-01

    It has been established that varicose veins are better visualized with infrared photography. As near-infrared films are nowadays hard to get and to develop in the digital world, we investigated the use of digital photography of varicose veins. Topics that are discussed are illumination setup, photography and digital image enhancement and analysis.

  7. 10-Minute Conultation Varicose veins

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    A 55 year old woman presents with a history of tortuous veins on both legs and a related ache towards the end of the day.She finds these veins unsightly and would like to know whether she can have them treated.

  8. [Hand infections].

    Science.gov (United States)

    Schiele, Philippe; Le Nen, Dominique

    2013-11-01

    Superficial and deep hand infections are frequent in general medical practice. Clinical examination is a crucial step for an adapted provided care. Most of the time, surgery is the only way to heal infections. However, in some cases (like bites), empiric antibiotherapy is first indicated to limit infection. Staphyloccocus aureus as well as Group Beta Streptococcus are the most frequently pathogenes associated with hand infections. Methicillin resistant S. Aureus must always be considered in the diagnoses. Whatever treatment is provided, clinical assessement must be repeated within two days. An early adaquated treatment prevent functional complications and in some cases death of the patients.

  9. Hand eczema

    Directory of Open Access Journals (Sweden)

    Uma Shankar Agarwal

    2014-01-01

    Full Text Available Hand eczema is often a chronic, multifactorial disease. It is usually related to occupational or routine household activities. Exact etiology of the disease is difficult to determine. It may become severe enough and disabling to many of patients in course of time. An estimated 2-10% of population is likely to develop hand eczema at some point of time during life. It appears to be the most common occupational skin disease, comprising 9-35% of all occupational diseases and up to 80% or more of all occupational contact dermatitis. So, it becomes important to find the exact etiology and classification of the disease and to use the appropriate preventive and treatment measures. Despite its importance in the dermatological practice, very few Indian studies have been done till date to investigate the epidemiological trends, etiology, and treatment options for hand eczema. In this review, we tried to find the etiology, epidemiology, and available treatment modalities for chronic hand eczema patients.

  10. Hand Osteoblastoma

    Directory of Open Access Journals (Sweden)

    M. Farzan

    2006-06-01

    Full Text Available Background and Aim: Osteoblastoma is one of the rarest primary bone tumors. Although, small bones of the hands and feet are the third most common location for this tumor, the hand involvement is very rare and few case observations were published in the English-language literature. Materials and Methods: In this study, we report five cases of benign osteoblastoma of the hand, 3 in metacarpals and two in phalanxes. The clinical feature is not specific. The severe nocturnal, salicylate-responsive pain is not present in patients with osteoblastoma. The pain is dull, persistent and less localized. The clinical course is usually long and there is often symptoms for months before medical attention are sought. Swelling is a more persistent finding in osteoblastoma of the hand that we found in all of our patients. The radiologic findings are indistinctive, so preoperative diagnosis based on X-ray appearance is difficult. In all of our 5 cases, we fail to consider osteoblastoma as primary diagnosis. Pathologically, osteoblastoma consisting of a well-vascularized connective tissue stroma in which there is active production of osteoid and primitive woven bone. Treatment depends on the stage and localization of the tumor. Curettage and bone grafting is sufficient in stage 1 or stage 2, but in stage 3 wide resection is necessary for prevention of recurrence. Osteosarcoma is the most important differential diagnosis that may lead to inappropriate operation.

  11. Hand eczema

    DEFF Research Database (Denmark)

    Ibler, K.S.; Jemec, G.B.E.; Flyvholm, M.-A.

    2012-01-01

    /materials/methods. A survey of 3181 healthcare workers was performed. Data were analysed with logistic regression. Data on sick leave and notification to the authorities were obtained. Results. The response rate was 71% (2274 of 3181). The 1-year prevalence of hand eczema was 21%, and was positively associated with atopic...

  12. Magic Hands

    Institute of Scientific and Technical Information of China (English)

    1998-01-01

    THE two most amazing things on the planet may well be the human brain and human hands. When they work together, the results can be enchanting. At an international folk art fair held recently in Beijing, artisans and masters from Japan, India, Switzerland, Peru, South

  13. 基于动态阈值的肌电假手动作控制方法研究%Movement Pattern Control for Prosthetic Hand Based on a Method of Dynamic Threshold

    Institute of Scientific and Technical Information of China (English)

    喻洪流; 胡加华

    2011-01-01

    由于构成肌电信号采集电路的电子元器件性能不可能完全对称及干扰信号的存在,有时会导致两路肌电信号发生阈值不一致。这时仍采用固定阈值来对两路肌电信号控制的动作进行判别,会导致动作的误判率增加。为了提高对假手动作判别的正确率,本文提出了利用动态阈值对假手动作进行判别。实验结果表明,利用动态阈值对假手动作进行判别,能够提高对动作判别的正确率达约10%。%Due to the function asymmetry of electrical components used for EMG signal acquisition circuit and the existing of undesired signals, sometimes thresholds for judging EMG's occur may be incongruent. If a fixed threshold is used to recognize Prosthetic Hand's movement,the matching rate of prosthetic hand's movement pattern recognition will be increased. In order to improve prosthetic hand's movement pattern recognition, a method of dynamic threshold was used to recognize the prosthetic hand's movement. The exprimental results showed that the method of dynamic threshold can obviously improve Prosthetic Hand's movement pattern recognition by about 10%.

  14. Dynamic Pattern Formation for Wings of Pterygota in an Eclosion ---Pattern Analysis for Wings with the Imago---

    Science.gov (United States)

    Seino, M.; Kakazu, Y.

    The vein and cell patterns for the fore and hind wing of Lepidoptera, Hemiptera, Orthoptera and Odonata are analyzed and discussed. For vein patterns of them, the fractal properties are shown and the inequality between four orders is obtained. The nature of wings observed by mass distributions for fractal dimensions of the vein pattern is presented.

  15. Sagittal vein thrombosis caused by central vein catheter.

    Directory of Open Access Journals (Sweden)

    Feridoun Sabzi

    2015-03-01

    Full Text Available Cerebral venous thrombosis, including thrombosis of cerebral veins and major dural sinuses, is an uncommon disorder in the general population. However, it has a higher frequency among patients younger than 40 years of age, patients with thrombophilia, pregnant patients or those receiving hormonal contraceptive therapy or has foreign body such as catheter in their veins or arterial system. In this case report, we described clinical and radiological findings in a patient with protein C-S deficiency and malposition of central vein catheter.

  16. Hands-On Bulletin Boards.

    Science.gov (United States)

    Henneman, Dawn

    1984-01-01

    Patterns and directions are given for making bulletin boards that teach language arts and mathematics skills through hands-on student involvement. The boards help teach multiplication tables, word contractions, letter sounds, homonyms, compound words, alphabetization, and other skills. (PP)

  17. Hands-On Bulletin Boards.

    Science.gov (United States)

    Henneman, Dawn

    1984-01-01

    Patterns and directions are given for making bulletin boards that teach language arts and mathematics skills through hands-on student involvement. The boards help teach multiplication tables, word contractions, letter sounds, homonyms, compound words, alphabetization, and other skills. (PP)

  18. Normal and abnormal development of pulmonary veins : State of the art and correlation with clinical entities

    NARCIS (Netherlands)

    Douglas, Yvonne L.; Jongbloed, Monique R. M.; DeRuiter, Marco C.; Gittenberger-de Groot, Adriana C.

    2011-01-01

    Interest for the pulmonary veins has increased in the past decade after the potential arrhythmogenicity of the myocardial sleeve surrounding these structures has been recognized. Furthermore, there are several clinical entities, such as anomalous connection pattern and pulmonary vein stenosis, that

  19. Neonatal renal vein thrombosis.

    Science.gov (United States)

    Brandão, Leonardo R; Simpson, Ewurabena A; Lau, Keith K

    2011-12-01

    Neonatal renal vein thrombosis (RVT) continues to pose significant challenges for pediatric hematologists and nephrologists. The precise mechanism for the onset and propagation of renal thrombosis within the neonatal population is unclear, but there is suggestion that acquired and/or inherited thrombophilia traits may increase the risk for renal thromboembolic disease during the newborn period. This review summarizes the most recent studies of neonatal RVT, examining its most common features, the prevalence of acquired and inherited prothrombotic risk factors among these patients, and evaluates their short and long term renal and thrombotic outcomes as they may relate to these risk factors. Although there is some consensus regarding the management of neonatal RVT, the most recent antithrombotic therapy guidelines for the management of childhood thrombosis do not provide a risk-based algorithm for the acute management of RVT among newborns with hereditary prothrombotic disorders. Whereas neonatal RVT is not a condition associated with a high mortality rate, it is associated with significant morbidity due to renal impairment. Recent evidence to evaluate the effects of heparin-based anticoagulation and thrombolytic therapy on the long term renal function of these patients has yielded conflicting results. Long term cohort studies and randomized trials may be helpful to clarify the impact of acute versus prolonged antithrombotic therapy for reducing the morbidity that is associated with neonatal RVT.

  20. [Surgery of essential varicose veins].

    Science.gov (United States)

    Maraval, M

    1994-03-15

    Idiopathic varicose veins of the lower limbs are a frequent but benign disorder. Surgery is only a moment in the course of the disease. Although not the only treatment of essential varicose veins, surgery by an experienced team performing crossectomy, stripping by intussusception using a stripper, and phlebectomy gives fully satisfactory results, both to patient and to physician, in over 80% of cases. New techniques were recently developed that, at present, have not confirmed early hopes.

  1. Portal Vein Thrombosis in non cirrhotic patients

    NARCIS (Netherlands)

    M.C.W. Spaander (Manon)

    2010-01-01

    textabstractExtrahepatic portal vein thrombosis (EPVT) is the most common cause of portal hypertension in non- cirrhotic patients. EPVT has been defined as an obstruction of the extrahepatic portal vein with or without involvement of the intrahepatic portal veins. Although the portal vein accounts f

  2. The EF-hand Ca(2+)-binding protein super-family: a genome-wide analysis of gene expression patterns in the adult mouse brain.

    Science.gov (United States)

    Girard, F; Venail, J; Schwaller, B; Celio, M R

    2015-05-21

    In mice, 249 putative members of the superfamily of EF-hand domain Ca(2+)-binding proteins, manifesting great diversity in structure, cellular localization and functions have been identified. Three members in particular, namely, calbindin-D28K, calretinin and parvalbumin, are widely used as markers for specific neuronal subpopulations in different regions of the brain. The aim of the present study was to compile a comprehensive atlas of the gene-expression profiles of the entire EF-hand gene superfamily in the murine brain. This was achieved by a meticulous examination of the in-situ hybridization images in the Allen Brain Atlas database. Topographically, our analysis focused on the olfactory bulb, cerebral cortex (barrel cortex in the primary somatosensory area), basal ganglia, hippocampus, amygdala, thalamus, hypothalamus, cerebellum, midbrain, pons and medulla, and on clearly identifiable sub-structures within each of these areas. The expression profiles of four family-members, namely hippocalcin-like 4, neurocalcin-δ, plastin 3 and tescalcin, that have not been hitherto reported, at either the mRNA (in-situ-hybridization) or the protein (immunohistochemical) levels, are now presented for the first time. The fruit of our analysis is a document in which the gene-expression profiles of all members of the EF-hand family genes are compared, and in which future possible neuronal markers for specific cells/brain areas are identified. The assembled information could afford functional clues to investigators, conducive to further experimental pursuit.

  3. [Injury pattern on the hand after slipping onto the blade during a knife attack--a contribution to the differential diagnostic classification of sharp force injuries of the upper extremities].

    Science.gov (United States)

    Tsokos, Michael; Braun, Christian

    2005-01-01

    Differential diagnosis of injuries caused by accidental slipping of the hand onto the blade of a knife includes self-inflicted injuries (e.g. to simulate an offense) as well as active and passive defense injuries indicative of the involvement of another party. The injury pattern on the hands of five perpetrators who suffered accidental cuts during knife attacks, as seen by the authors during the clinical forensic examination, is presented. The injuries were localized on the ulnar aspect of the thumb facing the index finger, the radial aspect of the index finger facing the thumb and variable sites on the flexor or extensor side of the middle and ring fingers. Especially in those cases in which the injuries of the victim (e.g. involvement of bony structures) and the dominant hand of the perpetrator are known, additional information for the reconstruction of the course of events may be derived from the cut wounds occurring during the knife attack as the hand slipped onto the blade.

  4. Maximizing the right renal vein length in laparoscopic live donor nephrectomy

    Directory of Open Access Journals (Sweden)

    Anibal W. Branco

    2004-10-01

    Full Text Available Laparoscopic donor nephrectomy has become the standard of care at increasing numbers of renal transplant programs worldwide. The majority of laparoscopic living donor kidneys are procured from the left side because of the longer renal vein and improved transplantation. The aim of this article is to report a technique to maximize the right renal vein length by performing a hand-assisted cavotomy.

  5. Does correlated color temperature affect the ability of humans to identify veins?

    DEFF Research Database (Denmark)

    Argyraki, Aikaterini; Clemmensen, Line Katrine Harder; Petersen, Paul Michael

    2016-01-01

    In the present study we provide empirical evidence and demonstrate statistically that white illumination settings can affect the human ability to identify veins in the inner hand vasculature. A special light-emitting diode lamp with high color rendering index (CRI 84–95) was developed...... and the effect of correlated color temperature was evaluated, in the range between 2600 and 5700 K at an illuminance of 40 9 lx on the ability of adult humans to identify veins. It is shown that the ability to identify veins can, on average, be increased up to 24% when white illumination settings that do...

  6. Palm Vein Verification Using Multiple Features and Locality Preserving Projections

    OpenAIRE

    Ali Mohsin Al-juboori; Wei Bu; Xiangqian Wu; Qiushi Zhao

    2014-01-01

    Biometrics is defined as identifying people by their physiological characteristic, such as iris pattern, fingerprint, and face, or by some aspects of their behavior, such as voice, signature, and gesture. Considerable attention has been drawn on these issues during the last several decades. And many biometric systems for commercial applications have been successfully developed. Recently, the vein pattern biometric becomes increasingly attractive for its uniqueness, stability, and noninvasiven...

  7. The anatomical variations of sylvian veins and cisterns.

    Science.gov (United States)

    Aydin, I H; Tüzün, Y; Takçi, E; Kadioğlu, H H; Kayaoğlu, C R; Barlas, E

    1997-06-01

    The anatomical variations of sylvian vein and cistern were investigated during the pterional approach in 750 operative cases with different pathologies. All patients were operated on at the Neurosurgical Department of Ataturk University Medical School, Erzurum, Turkiye. The patients underwent surgery for the lesions necessitating the right or left pterional approach. The findings were recorded during surgical intervention and observed through the operative sketches of the pathologies, the slides, and videotapes of the operations. In our study, we surgically classified the variations of sylvian vein, according to its branching and draining patterns. Type I: The fronto-orbital (frontosylvian), fronto-parietal (parietosylvian) and anterior temporal (temporosylvian) veins drain into one sylvian vein. Type II: Two superficial sylvian veins with separated basal vein draining into the sphenoparietal and Rosenthal's basal vein. Type III: Two superficial sylvian veins draining into the sphenoparietal and the superior petrosal veins. Type IV: Hypoplastic superficial sylvian vein and the deep one. Four types of sylvian vein variations were defined as follows. The type I was seen in 52.8% (n = 396), the type II was found in 19.2% (n = 144), type III was recorded in 18.2% (n = 137), and type IV, or hypoplastic and deep form was discovered in 9.8% (n = 73) of patients. The coursing of sylvian vein was in the temporal side (Temporal Coursing) in 62.4 percent of the cases (n = 469), in the frontal side (Frontal Coursing) in 25 % of the patients (n = 187) and in 9 percent of the cases (n = 67) in the deep localization (Deep Coursing). Only 3.6% of the cases (n = 27) showed Mixed Coursing. The variations of the sylvian cisterns were classified into three types, according to the relationships between the lateral fronto-orbital gyrus and the superior temporal gyrus. In Sylvian type, the frontal and temporal lobes are loosely (Sylvian Type A, wide and large) or tightly (Sylvian Type B

  8. Study and Design of Contactless Palm Vein Imaging System%非接触式手掌静脉成像系统的研究与设计

    Institute of Scientific and Technical Information of China (English)

    苑玮琦; 武珺; 谷宗辉

    2012-01-01

    Ideal palm vein imaging is the prerequisite of improving palm vein pattern recognition performance. It is designed a non- contact palm vein acquisition system in the paper. The system uses a wavelength of 85Onto round near-infrared LED as the active light source; meanwhile, uses the OV7410 camera with high sensitivity and aperture value of 2.8 with a focal length of 8mm lens. The experiment demonstrates the palm vein imaging device can acquire clear whole palm vein image, it provides hardware platform for multi-hand feature fusion.%获取理想手掌静脉图像是提高手掌静脉识别系统性能的前提条件。因此,本文设计一种非接触式全手掌静脉成像系统,该系统采用波长为850nm的圆头型近红外LED作为主动光源,同时选用与之灵敏度较高的OV7410摄像机并搭配光圈值为2.8、焦距为8mm的镜头。经实验表明,搭建的手掌静脉成像系统能够采集到清晰的全手掌静脉图像.为手部多模态特征融合提供了硬件平台。

  9. Minimally invasive treatments for perforator vein insufficiency.

    Science.gov (United States)

    Kuyumcu, Gokhan; Salazar, Gloria Maria; Prabhakar, Anand M; Ganguli, Suvranu

    2016-12-01

    Incompetent superficial veins are the most common cause of lower extremity superficial venous reflux and varicose veins; however, incompetent or insufficient perforator veins are the most common cause of recurrent varicose veins after treatment, often unrecognized. Perforator vein insufficiency can result in pain, skin changes, and skin ulcers, and often merit intervention. Minimally invasive treatments have replaced traditional surgical treatments for incompetent perforator veins. Current minimally invasive treatment options include ultrasound guided sclerotherapy (USGS) and endovascular thermal ablation (EVTA) with either laser or radiofrequency energy sources. Advantages and disadvantages of each modality and knowledge on these treatments are required to adequately address perforator venous disease.

  10. Extrahepatic Portal Vein Obstruction and Portal Vein Thrombosis in Special Situations: Need for a New Classification

    Science.gov (United States)

    Wani, Zeeshan A.; Bhat, Riyaz A.; Bhadoria, Ajeet S.; Maiwall, Rakhi

    2015-01-01

    Extrahepatic portal vein obstruction is a vascular disorder of liver, which results in obstruction and cavernomatous transformation of portal vein with or without the involvement of intrahepatic portal vein, splenic vein, or superior mesenteric vein. Portal vein obstruction due to chronic liver disease, neoplasm, or postsurgery is a separate entity and is not the same as extrahepatic portal vein obstruction. Patients with extrahepatic portal vein obstruction are generally young and belong mostly to Asian countries. It is therefore very important to define portal vein thrombosis as acute or chronic from management point of view. Portal vein thrombosis in certain situations such as liver transplant and postsurgical/liver transplant period is an evolving area and needs extensive research. There is a need for a new classification, which includes all areas of the entity. In the current review, the most recent literature of extrahepatic portal vein obstruction is reviewed and summarized. PMID:26021771

  11. Extrahepatic portal vein obstruction and portal vein thrombosis in special situations: Need for a new classification

    Directory of Open Access Journals (Sweden)

    Zeeshan A Wani

    2015-01-01

    Full Text Available Extrahepatic portal vein obstruction is a vascular disorder of liver, which results in obstruction and cavernomatous transformation of portal vein with or without the involvement of intrahepatic portal vein, splenic vein, or superior mesenteric vein. Portal vein obstruction due to chronic liver disease, neoplasm, or postsurgery is a separate entity and is not the same as extrahepatic portal vein obstruction. Patients with extrahepatic portal vein obstruction are generally young and belong mostly to Asian countries. It is therefore very important to define portal vein thrombosis as acute or chronic from management point of view. Portal vein thrombosis in certain situations such as liver transplant and postsurgical/liver transplant period is an evolving area and needs extensive research. There is a need for a new classification, which includes all areas of the entity. In the current review, the most recent literature of extrahepatic portal vein obstruction is reviewed and summarized.

  12. Subclavian Vein Cannulation Success Rate in Neonates and Children

    Science.gov (United States)

    Aminnejad, Reza; Razavi, Seyed Sajjad; Mohajerani, Seyed Amir; Mahdavi, Seyed Alireza

    2015-01-01

    Background: Central vein cannulation allows the administration of large volumes of fluids in short times and at high osmolarities for rehydration, volume replacement, chemotherapy, and parenteral nutrition. Percutaneous central venous line insertion has replaced peripheral venous cut-down as the primary mode of short-term venous access in children. Objectives: The aim of our study was to delineate some aspects of this procedure as well as its success rate and relative risk in pediatrics. Patients and Methods: Totally, 3264 subclavian vein cannulations in neonates and children were analyzed regarding successful catheterization attempts and early complication rates after the procedure retrospectively in Mofid Hospital (Tehran, Iran). Results: There were 1340 newborn patients (first 28 days of life) in our study population. In these newborns, only 55 cannulations failed; one patient was complicated with pneumothorax; guide wires malfunctioned in 21 cases; and first- attempt cannulation success was reported in only 981 cases. In the remaining 1924 patients, between one month and 8 years old, only 14 attempts at the cannulation of the subclavian vein failed and 1655 cases had first-attempt cannulation success. Conclusions: The cannulation of the central vein in neonates and children in a skilled hand would be performed with great success rate and low complications. PMID:26161322

  13. ARE LEFT HANDED SURGEONS LEFT OUT?

    OpenAIRE

    SriKamkshi Kothandaraman; Balasubramanian Thiagarajan

    2012-01-01

    Being a left-handed surgeon, more specifically a left-handed ENT surgeon, presents a unique pattern of difficulties.This article is an overview of left-handedness and a personal account of the specific difficulties a left-handed ENT surgeon faces.

  14. A variant extensor indicis muscle and the branching pattern of the deep radial nerve could explain hand functionality and clinical symptoms in the living patient.

    Science.gov (United States)

    Kumka, Myroslava

    2015-03-01

    The purpose of this study is to document the topographic anatomy of an extensor indicis (EI) muscle with a double tendon and the associated distribution of the deep branch of the radial nerve (DBRN). Both EI tendons were positioned deep to the tendons of the extensor digitorum as they traversed the dorsal osseofibrous tunnel. They then joined the medial slips of the extensor expansion of the second and third digits. In all other dissected forearms, a tendon of the EI muscle joined the medial slip of the extensor expansion to the index finger. The DBRN provided short branches to the superficial extensor muscles, long branches to the abductor pollicis longus and extensor pollicis brevis muscles, and terminated as the posterior interosseous nerve. Descending deep to the extensor pollicis longus muscle, the posterior interosseous nerve sent branches to the extensor pollicis brevis and EI muscles. Understanding of the topographic anatomy of an EI with a double tendon, and the associated distribution of the DBRN, may contribute to accurate diagnosis and treatment of hand lesions.

  15. Angiosarcoma of common iliac vein

    Science.gov (United States)

    Ibis, Kamuran; Usta, Ufuk; Cosar, Rusen; Ibis, Cem

    2015-01-01

    Angiosarcoma is a rare malignant tumour of endothelial cells. Primary angiosarcoma of venous origin is extremely rare, and has a very poor prognosis. A 63-year-old woman with retroperitoneal mass underwent en bloc resection on a part of iliac vein followed by adjuvant radiotherapy. No recurrence was detected during 3 years of follow-up. PMID:25596292

  16. Clinical studies on inferior right hepatic veins

    Institute of Scientific and Technical Information of China (English)

    Xue Xing; Hong Li; Wei-Guo Liu

    2007-01-01

    BACKGROUND:Many small veins are called accessory, short hepatic veins in addition to the right, middle and left hepatic veins. The size of these veins varied from a pinhole to 1 cm; the size of inferior right hepatic veins (IRHVs) is thicker than that of short hepatic veins or more than 1 cm occasionally. Adults have a higher incidence rate of the IRHV. DATA SOURCES:A literature search of the PubMed database was conducted and research articles were reviewed. RESULTS:The size of IRHVs is related to the size of the right hepatic vein, i.e. the larger the diameter of the right hepatic vein, the smaller the diameter of the IRHVs, and vice versa. The IRHVs are divided into superior, medial and inferior groups, separately named the superior, medial and inferior right hepatic veins according to the position of the IRHV entering the inferior vena cava. The superior right hepatic vein mainly drains the superior part of segmentⅦ, and the medial right hepatic vein drains the middle part of segmentⅦ. A thicker IRHV mainly drains segmentⅥ and the inferior part of segmentⅦ and a thinner IRHV drains the inferior part of segmentⅤ. CONCLUSIONS:The clinical signiifcance of these studies on IRHVs is varied: (1) Hepatic caudate lobe resection could be introduced after study on the veins of that lobe. (2) It is very important to identify the draining region of the IRHV for guiding hepatic segmentectomy. The postero-inferior area of the right lobe can be preserved along with the hypertrophic IRHV even if the entire main right hepatic vein is resected during segmentectomy ofⅦ andⅧwith right hepatic vein resection for patients with primary liver cancer. (3) The ligation of the major hepatic vein for the treatment of juxtahepatic vein injury is recommended because of severe hemorrhagic shock and dififculty in

  17. 应用于假手的肌电信号分类方法研究%Study of Pattern Recognition Methods for Prosthetic Hand Control

    Institute of Scientific and Technical Information of China (English)

    尤波; 周丽娜; 黄玲

    2011-01-01

    In order to obtain the purpose of controlling the myoelectric prosthetic hand efficiently and accurately , good signal classification methods must be designed. Classification methods of EMG are studied systematically in this paper. The basic principles and current research status of seven methods which are used frequently are presented , and classification methods of EMG based on neural network and support vector machine are analyzed in particular , and their classification results are compared from the aspects of Network type, signal feature, recognition accuracy and so on. Then, the advantages and disadvantages of each method are discussed as well as their adaptability. Finally, research directions of high quality identification method of EMG are discussed.%高效、准确的肌电信号分类方法是实现高仿生性肌电假手控制的关键技术之一.本文对肌电假手常用的信号分类方法进行了系统研究,阐述了目前常用的七种方法的基本原理和研究现状.重点分析了基于神经网络和支持向量机的肌电信号分类方法,分别从网络类型、所采用的信号特征、识别准确率等方面对分类结果进行了比较.最后,对各种方法的优缺点及适应性进行了分析,对实现高质量的肌电信号识别方法的研究方向进行了探讨.

  18. Common femoral vein reconstruction using internal jugular vein after blast injury.

    Science.gov (United States)

    Holt, Andrew M; West, Charles A; Davis, James A; Gilani, Ramyar; Askenasy, Eric

    2014-10-01

    Common femoral vein traumatic injuries are rare. Surgical management is controversial and by nature case specific. In this report, we present an unusual case of an isolated common femoral vein injury from a gunshot blast repaired with an interposition internal jugular vein bypass. To our knowledge, this is the first reported case of an isolated common femoral vein reconstructed in this manner.

  19. Who Is at Risk for Varicose Veins?

    Science.gov (United States)

    ... may raise your risk for varicose veins. The normal wear and tear of aging may cause the valves in your veins to weaken and not work well. Gender Women tend to get varicose veins more often than men. Hormonal changes that occur during puberty, pregnancy, and menopause (or ...

  20. Cephalic veins in coronary artery bypass surgery

    DEFF Research Database (Denmark)

    Licht, P; Jakobsen, Erik; Lerbjerg, G

    1996-01-01

    Various alternative conduits for aortocoronary bypass grafting have been suggested when the saphenous vein quality is inadequate. During a 10-year period we have used the cephalic vein in 39 patients. Eighteen entered an angiographic follow-up study. A total of 31 arm vein grafts were used with 4...

  1. Radiological aspects of portal vein embolization

    NARCIS (Netherlands)

    van Lienden, K.P.

    2012-01-01

    This thesis deals with liver regeneration after portal vein embolization (PVE) or portal vein ligation (PVL). Several aspects of these portal vein occlusion techniques are evaluated in clinical and experimental studies. In addition, the role of dynamic liver function tests and CT-volumetry in risk a

  2. Cephalic veins in coronary artery bypass surgery

    DEFF Research Database (Denmark)

    Licht, P; Jakobsen, Erik; Lerbjerg, G;

    1996-01-01

    Various alternative conduits for aortocoronary bypass grafting have been suggested when the saphenous vein quality is inadequate. During a 10-year period we have used the cephalic vein in 39 patients. Eighteen entered an angiographic follow-up study. A total of 31 arm vein grafts were used with 4...

  3. Variability in spatio-temporal pattern of trapezius activity and coordination of hand-arm muscles during a sustained repetitive dynamic task

    DEFF Research Database (Denmark)

    Samani, Afshin; Srinivasan, Divya; Mathiassen, Svend Erik;

    2016-01-01

    The spatio-temporal distribution of muscle activity has been suggested to be a determinant of fatigue development. Pursuing this hypothesis, we investigated the pattern of muscular activity in the shoulder and arm during a repetitive dynamic task performed until participants' rating of perceived...... power frequency (MNF) were calculated for all EMG signals. The barycenter of RMS values over the HD-EMG grid was also determined, as well as normalized mutual information (NMI) for each pair of muscles. Cycle-to-cycle variability of these metrics was also assessed. With time, EMG RMS increased for most...... of the muscles, and MNF decreased. Trapezius activity became higher on the lateral side than on the medial side of the HD-EMG grid and the barycenter moved in a lateral direction. NMI between muscle pairs increased with time while its variability decreased. The variability of the metrics during the initial 10...

  4. Right ovarian vein drainage variant: Is there a relationship with pelvic varices?

    Energy Technology Data Exchange (ETDEWEB)

    Koc, Zafer [Baskent Universitesi, Adana Hastanesi, Radyoloji Boeluemue, Serin Evler 39, Sok. No. 6 Yueregir, Adana (Turkey)]. E-mail: koczafer@gmail.com; Ulusan, Serife [Baskent Universitesi, Adana Hastanesi, Radyoloji Boeluemue, Serin Evler 39, Sok. No. 6 Yueregir, Adana (Turkey); Oguzkurt, Levent [Baskent Universitesi, Adana Hastanesi, Radyoloji Boeluemue, Serin Evler 39, Sok. No. 6 Yueregir, Adana (Turkey)

    2006-09-15

    Objective: To correlate right ovarian vein (ROV) variations that drain into the right renal vein (RRV) with the presence of pelvic varices. Materials and methods: Routine abdominal multidetector-row computed tomography scans of 324 women were analyzed for the presence and type of ROV variations in this retrospective study. The subjects were divided into 2 groups: those with ROV variations and those without such variations. The diameters of the subjects' ROV, left ovarian vein (LOV), and parauterine veins were measured. Pelvic varices and the presence and degree of ovarian vein reflux were noted and compared between the 2 groups. The {chi}{sup 2}-test and the Pearson correlation test were used for statistical analysis. Results: Thirty-two (9.9%) of 324 women studied exhibited ROV variant that drained into the right renal vein, and the remaining subjects (90.1%) exhibited a normal pattern of ROV drainage that flowed directly into the inferior vena cava. Pelvic varices were identified in 59 (18%) of the subjects. Reflux was not observed in any patient without pelvic varices. Fifty-seven of 59 women exhibited ovarian vein reflux. In 56 of those 57 individuals, reflux occurred only in the LOV, and in 1 subject, reflux was noted predominantly in the ROV. No significant relationship between the presence of an ROV that drained into the right renal vein and pelvic varices was noted. Conclusion: Although right-sided pelvic varices associated with right ovarian vein drainage variations are rare, anatomic variations of the right ovarian vein are not. This study did not find an association between the presence of right ovarian vein and pelvic varices.

  5. Recurrence of superficial vein thrombosis in patients with varicose veins.

    Science.gov (United States)

    Karathanos, Christos; Spanos, Konstantinos; Saleptsis, Vassileios; Tsezou, Aspasia; Kyriakou, Despina; Giannoukas, Athanasios D

    2016-08-01

    To investigate which factors other than history of superficial vein thrombosis (SVT) are associated with recurrent spontaneous SVT episodes in patients with varicose veins (VVs). Patients with a history of spontaneous SVT and VVs were followed up for a mean period of 55 months. Demographics, comorbidities, and thrombophilia screening test were analyzed. Patients were grouped according to the clinical-etiology-anatomy-pathophysiology classification. A multiple logistic regression analysis with the forward likelihood ratio method was undertaken. Thirteen patients out of 97 had a recurrence SVT episode during the follow-up period. All those patients were identified to have a thrombophilia defect. Protein C and S, antithrombin, and plasminogen deficiencies were more frequently present in patients without recurrence. Gene mutations were present in 38% in the nonrecurrence group and 77% in the recurrence group. After logistic regression analysis, patients with dislipidemia and mutation in prothrombin G20210A (FII) had an increased risk for recurrence by 5.4-fold and 4.6-fold, respectively. No deep vein thrombosis or pulmonary embolism occurred. Dislipidemia and gene mutations of F II are associated with SVT recurrence in patients with VVs. A selection of patients may benefit from anticoagulation in the short term and from VVs intervention in the long term. © The Author(s) 2015.

  6. Variability in spatio-temporal pattern of trapezius activity and coordination of hand-arm muscles during a sustained repetitive dynamic task.

    Science.gov (United States)

    Samani, Afshin; Srinivasan, Divya; Mathiassen, Svend Erik; Madeleine, Pascal

    2017-02-01

    The spatio-temporal distribution of muscle activity has been suggested to be a determinant of fatigue development. Pursuing this hypothesis, we investigated the pattern of muscular activity in the shoulder and arm during a repetitive dynamic task performed until participants' rating of perceived exertion reached 8 on Borg's CR-10 scale. We collected high-density surface electromyogram (HD-EMG) over the upper trapezius, as well as bipolar EMG from biceps brachii, triceps brachii, deltoideus anterior, serratus anterior, upper and lower trapezius from 21 healthy women. Root-mean-square (RMS) and mean power frequency (MNF) were calculated for all EMG signals. The barycenter of RMS values over the HD-EMG grid was also determined, as well as normalized mutual information (NMI) for each pair of muscles. Cycle-to-cycle variability of these metrics was also assessed. With time, EMG RMS increased for most of the muscles, and MNF decreased. Trapezius activity became higher on the lateral side than on the medial side of the HD-EMG grid and the barycenter moved in a lateral direction. NMI between muscle pairs increased with time while its variability decreased. The variability of the metrics during the initial 10 % of task performance was not associated with the time to task termination. Our results suggest that the considerable variability in force and posture contained in the dynamic task per se masks any possible effects of differences between subjects in initial motor variability on the rate of fatigue development.

  7. Endovascular Laser Therapy for Varicose Veins

    Science.gov (United States)

    2010-01-01

    randomized trials comparing ELT with surgical ligation and vein stripping (n= 6) was graded as moderate to high. Recovery after treatment was significantly quicker after ELT (return to work median number of days, 4 vs. 17; p= .005). Major adverse events occurring after surgery were higher [(1.8% (n=4) vs. 0.4% (n = 1) 1 but not significantly. Treatment effectiveness as measured by imaging vein absence or closure, symptom relief or quality of life similar in the two treatment groups and both treatments resulted in statistically significantly improvements in these outcomes. Recurrence was low after both treatments at follow up but neovascularization (growth of new vessels, a key predictor of long term recurrence was significantly more common (18% vs. 1%; p = .001) after surgery. Although patient satisfaction was reported to be high (>80%) with both treatments, patient preferences evaluated through recruitment process, physician reports and consumer groups were strongly in favour of ELT. For patients minimal complications, quick recovery and dependability of outpatient scheduling were key considerations. As clinical effectiveness of the two treatments was similar, a cost-analysis was performed to compare differences in resources and costs between the two procedures. A budget impact analysis for introducing ELT as an insured service was also performed. The average case cost (based on Ontario hospital costs and medical resources) for surgical vein stripping was estimated to be $1,799. Because of the uncertainties with resources associated with ELT, in addition to the device related costs, hospital costs were varied and assumed to be the same as or less than (40%) those for surgery resulting in an average ELT case cost of $2,025 or $1,602. Based on the historical pattern of surgical vein stripping for varices a 5-year projection was made for annual volumes and costs. In Ontario in 2007/2008, 3481 surgical vein stripping procedures were performed, 28% for repeat procedures. Annual

  8. Contact-free palm-vein recognition based on local invariant features.

    Science.gov (United States)

    Kang, Wenxiong; Liu, Yang; Wu, Qiuxia; Yue, Xishun

    2014-01-01

    Contact-free palm-vein recognition is one of the most challenging and promising areas in hand biometrics. In view of the existing problems in contact-free palm-vein imaging, including projection transformation, uneven illumination and difficulty in extracting exact ROIs, this paper presents a novel recognition approach for contact-free palm-vein recognition that performs feature extraction and matching on all vein textures distributed over the palm surface, including finger veins and palm veins, to minimize the loss of feature information. First, a hierarchical enhancement algorithm, which combines a DOG filter and histogram equalization, is adopted to alleviate uneven illumination and to highlight vein textures. Second, RootSIFT, a more stable local invariant feature extraction method in comparison to SIFT, is adopted to overcome the projection transformation in contact-free mode. Subsequently, a novel hierarchical mismatching removal algorithm based on neighborhood searching and LBP histograms is adopted to improve the accuracy of feature matching. Finally, we rigorously evaluated the proposed approach using two different databases and obtained 0.996% and 3.112% Equal Error Rates (EERs), respectively, which demonstrate the effectiveness of the proposed approach.

  9. Hand Rejuvenation: A Comprehensive Review of Fat Grafting.

    Science.gov (United States)

    Hoang, Don; Orgel, Matthew I; Kulber, David A

    2016-05-01

    Dermal atrophy, bulging reticular veins, and prominent bones and tendons are characteristic of the aging hand. Demand for cosmetic procedures to restore a youthful appearance to the dorsum of the hand has risen in recent years. A review of the literature reveals that of the many options for hand restoration, autologous fat grafting stands out as the most promising choice compared with many available alternative options such as microdermabrasion, peeling agents, and dermal fillers. This article details the surgical technique and relevant anatomy necessary for successful hand rejuvenation. Future advancements may rely on further study into adipose-derived stem cells.

  10. Management of varicose veins and venous insufficiency.

    Science.gov (United States)

    Hamdan, Allen

    2012-12-26

    Chronic venous disease, reviewed herein, is manifested by a spectrum of signs and symptoms, including cosmetic spider veins, asymptomatic varicosities, large painful varicose veins, edema, hyperpigmentation and lipodermatosclerosis of skin, and ulceration. However, there is no definitive stepwise progression from spider veins to ulcers and, in fact, severe skin complications of varicose veins, even when extensive, are not guaranteed. Treatment options range from conservative (eg, medications, compression stockings, lifestyle changes) to minimally invasive (eg, sclerotherapy or endoluminal ablation), invasive (surgical techniques), and hybrid (combination of ≥1 therapies). Ms L, a 68-year-old woman with varicose veins, is presented. She has had vein problems over the course of her life. Her varicose veins recurred after initial treatment, and she is now seeking guidance regarding her current treatment options.

  11. [ENDOVENOUS LASER TREATMENT FOR VARICOSE VEINS].

    Science.gov (United States)

    Tezuka, Masahiro; Kanaoka, Yuji; Ohki, Takao

    2015-05-01

    Varicose veins are a common condition attecting approximately 10 million patients in Japan. The main cause of varicose veins is reflux of the saphenous vein, and conventional treatment for several decades was stripping the affected saphenous vein and phlebectomy. Endovenous laser treatment (EVLT) is a less-invasive treatment method in which the saphenous vein is ablated with a laser under local anesthesia. EVLT has been approved by the Japanese Ministry of Health, Labor and Welfare since 2011, and we have performed EVLT on 5,160 legs with saphenous insufficiency with no severe complications including deep vein thrombosis except for one case of arteriovenous fistula. EVLT appears to be a safe, effective treatment option for varicose veins with saphenous insufficiency.

  12. Deep vein thrombosis in pregnancy.

    Science.gov (United States)

    Colman-Brochu, Stephanie

    2004-01-01

    This article provides a review of the incidence, pathophysiology, and treatment of deep vein thrombosis (DVT) in pregnancy, a rare but serious complication of pregnancy. The incidence of DVT in pregnancy varies widely, but it is a leading cause of maternal morbidity in both the United States and the United Kingdom. Risk factors during pregnancy include prolonged bed rest or immobility, pelvic or leg trauma, and obesity. Additional risk factors are preeclampsia, Cesarean section, instrument-assisted delivery, hemorrhage, multiparity, varicose veins, a previous history of a thromboembolic event, and hereditary or acquired thrombophilias such as Factor V Leiden. Heparin is the anticoagulant of choice to treat active thromboembolic disease or to administer for thromboprophylaxis, but low molecular-weight heparin is being used with increasing frequency in the pregnant woman. Perinatal nurses should be aware of the symptoms, diagnostic tools, and treatment options available to manage active thrombosis during pregnancy and in the intrapartum and postpartum periods.

  13. FINGER-VEIN RECOGNITION SYSTEMS

    Directory of Open Access Journals (Sweden)

    A.Haritha Deepthi

    2015-10-01

    Full Text Available As the Person‟s/Organization‟s Private information‟s are becoming very easy to access, the demand for a Simple, Convenient, Efficient, and a highly Securable Authentication System has been increased. In considering these requirements for data Protection, Biometrics, which uses human physiological or behavioral system for personal Identification has been found as a solution for these difficulties. However most of the biometric systems have high complexity in both time and space. So we are going to use a Real time Finger-Vein recognition System for authentication purposes. In this paper we had implemented the Finger Vein Recognition concept using MATLAB R2013a. The features used are Lacunarity Distance, Blanket Dimension distance. This has more accuracy when compared to conventional methods.

  14. Mortality after portal vein embolization

    Science.gov (United States)

    Lee, Eung Chang; Park, Sang-Jae; Han, Sung-Sik; Park, Hyeong Min; Lee, Seung Duk; Kim, Seong Hoon; Lee, In Joon; Kim, Hyun Beom

    2017-01-01

    Abstract Portal vein embolization (PVE) is increasingly performed worldwide to reduce the possibility of liver failure after extended hepatectomy, by inducing future liver remnant (FLR) hypertrophy and atrophy of the liver planned for resection. The procedure is known to be very safe and to have few procedure-related complications. In this study, we described 2 elderly patients with Bismuth–Corlette type IV Klatskin tumor who underwent right trisectional PVE involving the embolization of the right portal vein, the left medial sectional portal branch, and caudate portal vein. Within 1 week after PVE, patients went into sepsis combined with bile leak and died within 1 month. Sepsis can cause acute liver failure in patients with chronic liver disease. In this study, the common patient characteristics other than sepsis, that is, trisectional PVE; chronic alcoholism; aged >65 years; heart-related comorbidity; and elevated serum total bilirubin (TB) level (7.0 mg/dL) at the time of the PVE procedure in 1 patient, and concurrent biliary procedure, that is, percutaneous transhepatic biliary drainage in the other patient might have affected the outcomes of PVE. These cases highlight that PVE is not a safe procedure. Care should be taken to minimize the occurrence of infectious events because sepsis following PVE can cause acute liver failure. Additionally, prior to performing PVE, the extent of PVE, chronic alcohol consumption, age, comorbidity, long-lasting jaundice, concurrent biliary procedure, etc. should be considered for patient safety. PMID:28178122

  15. Intravenous pyogenic granuloma of the hand - a case report.

    Science.gov (United States)

    Joethy, J; Al Jajeh, I; Tay, S C

    2011-01-01

    Intravenous pyogenic granuloma represents a variant of the common pyogenic granuloma in which the capillary proliferation is entirely confined to the lumen of a vein. To our knowledge, this entity is rare and only a few cases have been reported before in the hand. We present a case of intravenous pyogenic granuloma of the hand and a review of this entity from previous published cases.

  16. SIFT Based Vein Recognition Models: Analysis and Improvement

    Directory of Open Access Journals (Sweden)

    Guoqing Wang

    2017-01-01

    Full Text Available Scale-Invariant Feature Transform (SIFT is being investigated more and more to realize a less-constrained hand vein recognition system. Contrast enhancement (CE, compensating for deficient dynamic range aspects, is a must for SIFT based framework to improve the performance. However, evidence of negative influence on SIFT matching brought by CE is analysed by our experiments. We bring evidence that the number of extracted keypoints resulting by gradient based detectors increases greatly with different CE methods, while on the other hand the matching result of extracted invariant descriptors is negatively influenced in terms of Precision-Recall (PR and Equal Error Rate (EER. Rigorous experiments with state-of-the-art and other CE adopted in published SIFT based hand vein recognition system demonstrate the influence. What is more, an improved SIFT model by importing the kernel of RootSIFT and Mirror Match Strategy into a unified framework is proposed to make use of the positive keypoints change and make up for the negative influence brought by CE.

  17. Revascularization using satellite vein after radial artery harvested for coronary artery bypass grafting.

    Science.gov (United States)

    Gon, Shigeyoshi; Yoshida, Shigehiko; Sanae, Tsutomu; Takahashi, Tamami; Inada, Eiichi

    2006-06-01

    The radial artery has been increasingly used for coronary artery bypass grafting and has excellent long-term patency rates. Hand claudication is one of the adverse effects after radial artery harvest. We reconstructed a radial artery using the satellite vein to prevent hand claudication. Pulsating blood flow at 35 cm/sec was evaluated using color Doppler echocardiography three months after surgery. This method makes it possible to use a radial artery in patients with a positive Allen test.

  18. Hand Dominance and Common Hand Conditions.

    Science.gov (United States)

    Lutsky, Kevin; Kim, Nayoung; Medina, Juana; Maltenfort, Mitchell; Beredjiklian, Pedro K

    2016-05-01

    The goals of this study were to (1) assess how frequently patients present for evaluation of common hand disorders in relation to hand dominance and (2) evaluate the effect of hand dominance on function in patients with these conditions. The authors hypothesized that (1) the majority of patients who seek evaluation would have a condition that affects the dominant hand, and (2) disability scores would be worse if the dominant hand is involved. They retrospectively reviewed the records of consecutive patients who presented for treatment to their institution with unilateral symptoms of 5 common disorders of the hand: carpal tunnel syndrome (CTS), de Quervain's tenosynovitis (DEQ), lateral epicondylitis (LE), hand osteoarthritis (OA), and trigger finger (TF). The authors assessed the effect of diagnosis and hand dominance on Disabilities of the Arm, Shoulder and Hand (DASH) scores. The study group comprised 1029 patients (379 men and 650 women) with a mean age of 59.5 years. Ninety percent were right-hand dominant. The dominant and nondominant hands were affected with relatively equal frequency for CTS, DEQ, OA, and TF (range, 45%-53%). Patients with LE had a significantly higher incidence of dominant hand involvement. Men had lower DASH scores than women by an average of 7.9 points, and DASH scores were significantly but slightly higher for the overall group (3.2 points) when the dominant side was affected. Men with LE and women with TF and OA had significantly higher DASH scores when their dominant extremity was affected. Common hand disorders such as CTS, DEQ, OA, and TF affect the dominant and nondominant hands in roughly equivalent proportions, whereas LE is more common on the dominant side. Dominant hand involvement results in significantly worse DASH scores, although the magnitude of this is relatively small. Women have significantly higher DASH scores than men for the conditions evaluated. [Orthopedics. 2016; 39(3):e444-e448.].

  19. Undivided Retromandibular Vein Continuing As External Jugular Vein With Facial Vein Draining Into It : An Anatomical Variation

    Directory of Open Access Journals (Sweden)

    Shahnaz Choudhary, Ashwani K Sharma, Harbans Singh

    2010-10-01

    Full Text Available Despite the fact that the blueprint of the whole body is unravelled, faultlessly during the growth anddevelopment of an animal; but amazingly variations do occur. During routine dissection of head and neckin a middle aged cadaver in the Post Graduate Department of Anatomy of this medical college, we foundvariation in the formation of external jugular vein on both sides, which was formed by the continuation ofundivided trunk of retromandibular vein. The facial vein and posterior auricular vein were the tributaries ofexternal jugular vein. The sound anatomical knowledge of variations of the veins of head and neck isessential to the success of surgical procedures. The embryological evaluation of the above anomaly wasdone and compared with the available literature which showed that the observed variation was rare

  20. The umbilical and paraumbilical veins of man.

    Science.gov (United States)

    Martin, B F; Tudor, R G

    1980-03-01

    During its transit through the umbilicus structural changes occur in the thick wall of the extra-abdominal segment of the umbilical vein whereby the components of the intra-abdominal segment acquire an essentially longitudinal direction and become arranged in fibro-elastic and fibro-muscular zones. The vein lumen becomes largely obliterated by asymmetrical proliferation of loose subendothelial conective tissue. The latter forms a new inner zone within which a small segment of the lumen persists in an eccentric position. This residual lumen transmits blood to the portal system from paraumbilical and systemic sources, and is retained in the upper part of the vein, even in old age. A similar process of lumen closure is observed in the ductus venosus. In early childhood the lower third of the vein undergoes breakdown, with fatty infiltration, resulting in its complete division into vascular fibro-elastic strands, and in old age some breakdown occurs in the outermost part of the wall of the upper two thirds. The paraumbilical veins are thick-walled and of similar structure to the umbilical vein. Together they constitute an accessory portal system which is confined between the layers of the falciform ligament and is in communication with the veins of the ventral abdominal wall. The constituents form an ascending series, namely, Burow's veins, the umbilical vein, and Sappey's inferior and superior veins. The main channel of Sappey's inferior veins may be the remnant of the right umbilical vein since it communicates with the right rectus sheath and often communicates directly with the portal system within the right lobe of the liver. The results are of significance in relation to clinical usage of the umbilical vein.

  1. Doppler-ultrasonographic finding of air in the portal vein: a case report

    Energy Technology Data Exchange (ETDEWEB)

    Park, Ki Soon; Lee, Kwan Sup; Lee, Yul; Chung, Soo Young; Bae, Sang Hoon [College of Medicine, Hallym University, Seoul (Korea, Republic of)

    1994-03-15

    Classically air in the portal vein has been detected on plain radiography, but computed tomography and ultrasonography have been shown to be more sensitive. We report a case of air in the PV in a 10-day-old infant with pneumatosis intestinalis with its ultrasonographic and Doppler findings. The patient was a 10-day-old infant born by cesarean section at 41 weeks. Simple abdomen film revealed branching pattern of radiolucent air shadows within in contour of liver, gas distention of bowel loops and thickenod bowel walls with lincar intraluminal air shadows in abdomen, suggesting necrotizing enterocolitis. So we performed Doppler ultrasonography. Ultrasonography showed branching pattern of hyperechogenic dots and along the lumen of left portal vein. The color Doppler study revealed an aliasing duo to increased velocity and whirling pattern of blood flow, and the Duplex Doppler spectral display showed sharp, vertical bidirectional spikes by air in portal vein. Air in the portal vein can be easily diagnosed by the following signs: hyperechogenic dots in the portal vein on ultrasonography and vertical, sharp bidirectional spikes superimposed on the usual Doppler tracing of the portal vein on Duplex ultrasonography.

  2. Eye-dominance, writing hand, and throwing hand.

    Science.gov (United States)

    McManus, I C; Porac, C; Bryden, M P; Boucher, R

    1999-04-01

    Handedness and eye-dominance are undoubtedly associated statistically, although a previous meta-analysis has found that the precise relationship is difficult to explain, with about 35% of right-handers and 57% of left-handers being left eye dominant. Of particular difficulty to genetic or other models is that the proportions are distributed asymmetrically around 50%. The present study asked whether this complicated pattern of association occurred because, following Peters, it is necessary to divide right-and left-handers into consistent handers (who write and throw with the same hand) and inconsistent handers (who write and throw with opposite hands). In an analysis of 10,635 subjects from questionnaire studies, 28.8% of left-handers and 1.6% of right-handers by writing were inconsistent for throwing. Our results also showed that writing hand and throwing hand both relate independently to eyedness, that throwing hand is somewhat more strongly associated with eyedness, and that the awkward asymmetry around 50% is now removed, 24.2% of consistent right-handers being left eye dominant compared with 72.3% of consistent left-handers, and 55.4% of inconsistent right-handers compared with 47.0% of inconsistent left-handers. We conclude that eyedness is phenotypically secondary to writing and throwing handedness. In our discussion we note that eyedness runs in families, we present new data suggesting that writing hand and throwing hand are co-inherited, and we argue that further data are now required to model properly the associations of writing hand, throwing hand, and eyedness, as well as probably also footedness and language dominance.

  3. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... children, parents, and public health professionals. More > Hand Hygiene Saves Lives (5:10) Recommend on Facebook Tweet Share Compartir Hand Hygiene Saves Lives Hand Hygiene Saves Lives Transcript [28 KB, 2 pages] High ...

  4. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... including, children, parents, and public health professionals. More > Hand Hygiene Saves Lives (5:10) Recommend on Facebook Tweet Share Compartir Hand Hygiene Saves Lives Hand Hygiene Saves Lives Transcript [28 KB, 2 pages] High ...

  5. Hand Hygiene Saves Lives

    Science.gov (United States)

    ... including, children, parents, and public health professionals. More > Hand Hygiene Saves Lives (5:10) Recommend on Facebook Tweet Share Compartir Hand Hygiene Saves Lives Hand Hygiene Saves Lives Transcript [28 KB, 2 pages] High ...

  6. Guideline Implementation: Hand Hygiene.

    Science.gov (United States)

    Goldberg, Judith L

    2017-02-01

    Performing proper hand hygiene and surgical hand antisepsis is essential to reducing the rates of health care-associated infections, including surgical site infections. The updated AORN "Guideline for hand hygiene" provides guidance on hand hygiene and surgical hand antisepsis, the wearing of fingernail polish and artificial nails, proper skin care to prevent dermatitis, the wearing of jewelry, hand hygiene product selection, and quality assurance and performance improvement considerations. This article focuses on key points of the guideline to help perioperative personnel make informed decisions about hand hygiene and surgical hand antisepsis. The key points address the necessity of keeping fingernails and skin healthy, not wearing jewelry on the hands or wrists in the perioperative area, properly performing hand hygiene and surgical hand antisepsis, and involving patients and visitors in hand hygiene initiatives. Perioperative RNs should review the complete guideline for additional information and for guidance when writing and updating policies and procedures.

  7. Hand eczema guidelines based on the Danish guidelines for the diagnosis and treatment of hand eczema

    DEFF Research Database (Denmark)

    Menné, Torkil; Johansen, Jeanne D; Sommerlund, Mette

    2011-01-01

    Background. Classification of hand eczema has traditionally been based both on aetiology and clinical appearance. For 20% of cases, the aetiology is unknown. Objectives. To suggest a classification based on well-defined aetiology as well as on predefined clinical patterns and on the dynamics...... of hand eczema. Methods. Literature studies and discussions among members of the Danish Contact Dermatitis Group. Results. Criteria are given for the aetiological diagnoses of allergic contact dermatitis of the hands, irritant contact dermatitis of the hands, protein contact dermatitis of the hands......, atopic hand eczema and aetiologically unclassifiable hand eczema. Six different clinical patterns are described and illustrated. Suggestions for general treatment principles are given. Conclusion. Operational guidelines for the diagnosis and treatment of hand eczema are described....

  8. Blood vessel classification into arteries and veins in retinal images

    Science.gov (United States)

    Kondermann, Claudia; Kondermann, Daniel; Yan, Michelle

    2007-03-01

    The prevalence of diabetes is expected to increase dramatically in coming years; already today it accounts for a major proportion of the health care budget in many countries. Diabetic Retinopathy (DR), a micro vascular complication very often seen in diabetes patients, is the most common cause of visual loss in working age population of developed countries today. Since the possibility of slowing or even stopping the progress of this disease depends on the early detection of DR, an automatic analysis of fundus images would be of great help to the ophthalmologist due to the small size of the symptoms and the large number of patients. An important symptom for DR are abnormally wide veins leading to an unusually low ratio of the average diameter of arteries to veins (AVR). There are also other diseases like high blood pressure or diseases of the pancreas with one symptom being an abnormal AVR value. To determine it, a classification of vessels as arteries or veins is indispensable. As to our knowledge despite the importance there have only been two approaches to vessel classification yet. Therefore we propose an improved method. We compare two feature extraction methods and two classification methods based on support vector machines and neural networks. Given a hand-segmentation of vessels our approach achieves 95.32% correctly classified vessel pixels. This value decreases by 10% on average, if the result of a segmentation algorithm is used as basis for the classification.

  9. Hand function after nerve repair.

    Science.gov (United States)

    Lundborg, G; Rosén, B

    2007-02-01

    Treatment of injuries to major nerve trunks in the hand and upper extremity remains a major and challenging reconstructive problem. Such injuries may cause long-lasting disabilities in terms of lost fine sensory and motor functions. Nowadays there is no surgical repair technique that can ensure recovery of tactile discrimination in the hand of an adult patient following nerve repair while very young individuals usually regain a complete recovery of functional sensibility. Post-traumatic nerve regeneration is a complex biological process where the outcome depends on multiple biological and environmental factors such as survival of nerve cells, axonal regeneration rate, extent of axonal misdirection, type of injury, type of nerve, level of the lesion, age of the patient and compliance to training. A major problem is the cortical functional reorganization of hand representation which occurs as a result of axonal misdirection. Although protective sensibility usually occurs following nerve repair, tactile discriminative functions seldom recover--a direct result of cortical remapping. Sensory re-education programmes are routinely applied to facilitate understanding of the new sensory patterns provided by the hand. New trends in hand rehabilitation focus on modulation of central nervous processes rather than peripheral factors. Principles are being evolved to maintain the cortical hand representation by using the brain capacity for visuo-tactile and audio-tactile interaction for the initial phase following nerve injury and repair (phase 1). After the start of the re-innervation of the hand (phase 2), selective de-afferentation, such as cutaneous anaesthesia of the forearm of the injured hand, allows expansion of the nerve-injured cortical hand representation, thereby enhancing the effects of sensory relearning. Recent data support the view that training protocols specifically addressing the relearning process substantially increase the possibilities for improved

  10. Preduodenal portal vein: its surgical significance.

    Science.gov (United States)

    Makey, D A; Bowen, J C

    1978-11-01

    Preduodenal portal vein is a rare anatomical variant which may be one of many anomalies in the neonate with duodenal "atresia." Preduodenal portal vein also may be an occasional finding in an adult undergoing biliary, gastric, or pancreatic surgery. Awareness and recognition of the anomaly are essential for the avoidance of injury during such operations. We report here a symptomless patient whose preduodenal portal vein was discovered at cholecystectomy.

  11. Hand kinematics of piano playing.

    Science.gov (United States)

    Furuya, Shinichi; Flanders, Martha; Soechting, John F

    2011-12-01

    Dexterous use of the hand represents a sophisticated sensorimotor function. In behaviors such as playing the piano, it can involve strong temporal and spatial constraints. The purpose of this study was to determine fundamental patterns of covariation of motion across joints and digits of the human hand. Joint motion was recorded while 5 expert pianists played 30 excerpts from musical pieces, which featured ∼50 different tone sequences and fingering. Principal component analysis and cluster analysis using an expectation-maximization algorithm revealed that joint velocities could be categorized into several patterns, which help to simplify the description of the movements of the multiple degrees of freedom of the hand. For the thumb keystroke, two distinct patterns of joint movement covariation emerged and they depended on the spatiotemporal patterns of the task. For example, the thumb-under maneuver was clearly separated into two clusters based on the direction of hand translation along the keyboard. While the pattern of the thumb joint velocities differed between these clusters, the motions at the metacarpo-phalangeal and proximal-phalangeal joints of the four fingers were more consistent. For a keystroke executed with one of the fingers, there were three distinct patterns of joint rotations, across which motion at the striking finger was fairly consistent, but motion of the other fingers was more variable. Furthermore, the amount of movement spillover of the striking finger to the adjacent fingers was small irrespective of the finger used for the keystroke. These findings describe an unparalleled amount of independent motion of the fingers.

  12. Small hepatic veins Budd-Chiari syndrome.

    Science.gov (United States)

    Riggio, Oliviero; Marzano, Chiara; Papa, Alessia; Pasquale, Chiara; Gasperini, Maria Ludovica; Gigante, Antonietta; Valla, Dominique Charles; Plessier, Aurélie; Amoroso, Antonio

    2014-05-01

    Budd-Chiari syndrome is a rare disorder characterized by hepatic venous outflow obstruction at any level from the small hepatic veins to the atrio-caval junction, in the absence of heart failure or constrictive pericarditis. Various imaging modalities are available for investigating the gross hepatic vascular anatomy but there are rare forms of this disease where the obstruction is limited to the small intrahepatic veins, with normal appearance of the large hepatic veins at imaging. In this cases only a liver biopsy can demonstrate the presence of a small vessels outflow block. We report two cases of small hepatic veins Budd-Chiari syndrome.

  13. Leiomyosarcoma of the external iliac vein.

    Science.gov (United States)

    Fukuda, Wakako; Taniguchi, Satoshi; Fukuda, Ikuo

    2012-06-01

    Leiomyosarcoma of the iliac vein is an uncommon tumor. We report a case of a 63-year-old Japanese woman with leiomyosarcoma of the right external iliac vein. The patient complained of right inguinal pain and swelling. Computed tomography demonstrated a mass surrounding the right external iliac artery and vein. Metastases in the lungs and liver were found. Complete resection of the tumor along with the involved vessels was performed. Polytetrafluoroethylene grafts were used to reconstruct the vessels. Pathological examination revealed leiomyosarcoma of the external iliac vein. Although the prognosis of leiomyosarcoma is poor, en bloc tumor resection is the treatment of choice.

  14. Sonographic Findings in Fetal Renal Vein Thrombosis.

    Science.gov (United States)

    Gerber, Rebecca E; Bromley, Bryann; Benson, Carol B; Frates, Mary C

    2015-08-01

    We present the sonographic findings of fetal renal vein thrombosis in a series of 6 patients. The mean gestational age at diagnosis was 31.2 weeks. Four cases were unilateral, and 2 were bilateral. The most common findings were renal enlargement and intrarenal vascular calcifications, followed by increased renal parenchymal echogenicity. Inferior vena cava thrombosis was found in 4 patients and common iliac vein thrombosis in 2. Fetal renal vein thrombosis is an uncommon diagnosis with characteristic sonographic findings. The presence of these findings should prompt Doppler interrogation of the renal vein and inferior vena cava to confirm the diagnosis.

  15. Doppler study of hepatic vein in cirrhotic patients: Correlation with liver dysfunction and hepatic hemodynamics

    Institute of Scientific and Technical Information of China (English)

    KC Sudhamshu; Shoiichi Matsutani; Hitoshi Maruyama; Taro Akiike; Hiromitsu Saisho

    2006-01-01

    AIM: To elucidate the significance of Doppler measurements of hepatic vein in cirrhotic patients and to correlate with liver dysfunction and hepatic hemodynamics.METHODS: One hundred patients with liver cirrhosis and 60 non-cirrhotic controls were studied. Doppler waveforms were obtained from right hepatic vein and flow velocity measured during quiet respiration. Doppler measurements were also obtained from portal trunk,right portal vein and proper hepatic artery.RESULTS: Hepatic vein waveforms were classified into three classical patterns. Flat waveform was uncommon.Mean hepatic vein velocity was significantly higher in cirrhotic patients (12.7 ± 6.4 vs 5.1 ± 2.1 and 6.2 ± 3.2 cm/s; P < 0.0001). The poorer the grade of cirrhosis,the higher was the mean velocity. Maximum forward velocity was never greater than 40 cm/s in controls.Degree of ascites was found to be highly correlated with mean velocity. "Very high" group (≥ 20 cm/s) presented clinically with moderate to massive ascites. Correlations between right portal flow and mean velocity was significant (P < 0.0001, r = 0.687).CONCLUSION: Doppler waveforms of hepatic vein,which is independent of liver dysfunction, should be obtained during normal respiration. Mean hepatic vein velocity reflects the change in hepatic circulation associated with progression of liver cirrhosis. It can be used as a new parameter in the assessment of liver cirrhosis.

  16. phenoVein - A tool for leaf vein segmentation and analysis

    OpenAIRE

    Bühler, J.; Rishmawi, L.; Pflugfelder, D.; Huber, G; Scharr, H.; Hülskamp, M; Koornneef, M.; Schurr, U; Jahnke, S.

    2015-01-01

    Precise measurements of leaf vein traits are an important aspect of plant phenotyping for ecological and genetic research. Here, we present a powerful and user-friendly image analysis tool named phenoVein. It is dedicated to automated segmenting and analyzing of leaf veins in images acquired with different imaging modalities (microscope, macrophotography, etc.), including options for comfortable manual correction. Advanced image filtering emphasizes veins from the background and compensates f...

  17. Subclavian artery to internal jugular vein fistula following percutaneous internal jugular vein catheterization.

    Science.gov (United States)

    Merino-Angulo, J; Cortazar, J L; Saez-Garmendia, F; Montejo, M

    1984-01-01

    The percutaneous internal jugular vein approach is now a commonly performed procedure for central venous catheterization. Iatrogenic arteriovenous fistulae are a very infrequent complication. We report an asymptomatic subclavian artery to internal jugular vein fistula following two percutaneous internal jugular vein catheterization attempts.

  18. The Hot Hand Belief and Framing Effects

    Science.gov (United States)

    MacMahon, Clare; Köppen, Jörn; Raab, Markus

    2014-01-01

    Purpose: Recent evidence of the hot hand in sport--where success breeds success in a positive recency of successful shots, for instance--indicates that this pattern does not actually exist. Yet the belief persists. We used 2 studies to explore the effects of framing on the hot hand belief in sport. We looked at the effect of sport experience and…

  19. Generating and analyzing synthetic finger vein images

    NARCIS (Netherlands)

    Hillerström, Fieke; Kumar, Ajay; Veldhuis, Raymond

    2014-01-01

    Abstract: The finger-vein biometric offers higher degree of security, personal privacy and strong anti-spoofing capabilities than most other biometric modalities employed today. Emerging privacy concerns with the database acquisition and lack of availability of large scale finger-vein database have

  20. PORTAL VEIN THROMBOSIS-ULTRASOUND IMAGING

    Directory of Open Access Journals (Sweden)

    Trajkovska Meri

    2016-07-01

    Full Text Available Portal venous system, apart from the main portal vein, includes its tributaries: superior and inferior mesenteric vein, as well as splenic vein, so the term portal venous thrombosis encompasses a broad spectrum of pathological conditions. Usually, one or more causative factors can be recognized, either local endothelial/ flow disturbances, or systemic inherited /acquired conditions. Portal vein thrombosis can be associated with benign or malignant disorders. Weather we are speaking about acute or chronic thrombosis, the clinical presentation is different. Acute thrombosis can be presented in a wide range, from mild abdominal discomfort to a state of intestinal ischemia and life-threatening infarction. Chronic thrombosis is usually recognized when variceal bleeding or other symptoms of portal hypertension express. Fast and accurate diagnosis sometimes is a life-saving procedure, especially in acute vascular alterations. Recently, due to the improvement of imaging procedures the number of patients with diagnosed portal vein thrombosis is increasingly growing. With a negative predictive value of 98% color Doppler ultrasound is considered as imaging modality of choice in detecting portal vein thrombosis. Based on large studies it is presumed that overall risk of getting portal vein thrombosis during lifetime is 1% in general population, but much bigger 5%-15% in cirrhotic patients. Existence of specific ultrasound criteria, if fulfilled, has ensured that diagnosis of portal vein thrombosis is fast and non-invasive. Procedure is convenient for the patient and healthcare providers, and above all, allows prompt treatment preventing further deterioration.

  1. Endovenous laser therapy for varicose veins

    NARCIS (Netherlands)

    Disselhoff, B.C.V.M.

    2008-01-01

    This thesis describes the technique of endovenous laser ablation and the outcome of various series of patients with varicose veins due to reflux in the great saphenous vein, treated by endovenous laser ablation or cryostripping in a single-centre study. This study has shown clear advantages of endov

  2. Vein of foramen caecum: imaging findings.

    Science.gov (United States)

    Tutar, Onur; Kandemirli, Sedat Giray; Yildirim, Duzgun; Memis, Emine Sebnem; Bakan, Selim

    2016-07-01

    Vein of foramen caecum has been classically described as a vein that connects nasal mucosa to the superior sagittal sinus in classic anatomy textbooks. However, its existence is controversial in literature. Herein, we demonstrated computed tomography and contrast enhanced magnetic resonance imaging findings of a tubular vascular structure extending to nasal mucosa and superior sagittal sinus.

  3. Improving the management of varicose veins.

    Science.gov (United States)

    Onida, Sarah; Lane, Tristan R A; Davies, Alun H

    2013-01-01

    Up to 30% of the UK population are affected by varicose veins. They are a manifestation of increased venous pressure in the lower limb caused by impaired venous return. Primary varicosities result from poor drainage from the superficial to the deep venous system. Secondary varicosities arise as a result of underlying pathology impeding venous drainage, such as deep venous thrombosis or increased intra-abdominal pressure caused by a mass, pregnancy or obesity. Patients with bleeding varicose veins should be referred to a vascular service immediately. Referral is also indicated in the following cases: symptomatic primary or recurrent varicose veins; lower limb skin changes thought to be caused by chronic venous insufficiency; superficial vein thrombosis and suspected venous incompetence; a venous leg ulcer or healed venous leg ulcer. Imaging is crucial in the assessment of the superficial and deep venous system to enable assessment of venous competence. The gold standard imaging technique is colour duplex ultrasonography. Duplex ultrasound should be used to confirm the diagnosis of varicose veins and the extent of truncal reflux, and to plan treatment for patients with suspected primary or recurrent varicose veins. Superficial vein ligation, phlebectomy and stripping have been the mainstay of treatment. In recent years, new techniques have been developed that are minimally invasive, enabling treatment of superficial venous incompetence with reduced morbidity. NICE recommends that endothermal ablation, in the form of radiofrequency or laser treatment, should be offered as treatment for patients with confirmed varicose veins and truncal reflux.

  4. Retinal vein occlusion: pathophysiology and treatment options

    OpenAIRE

    Niral Karia

    2010-01-01

    Niral KariaDepartment of Ophthalmology, Southend Hospital, Prittlewell Chase, Westcliff on Sea, Essex, United KingdomAbstract: This paper reviews the current thinking about retinal vein occlusion. It gives an overview of its pathophysiology and discusses the evidence behind the various established and emerging treatment paradigms.Keywords: central, hemispheric, branch, retinal vein occlusion, visual loss

  5. Quantifying leaf venation patterns: two-dimensional maps.

    Science.gov (United States)

    Rolland-Lagan, Anne-Gaëlle; Amin, Mira; Pakulska, Malgosia

    2009-01-01

    The leaf vasculature plays crucial roles in transport and mechanical support. Understanding how vein patterns develop and what underlies pattern variation between species has many implications from both physiological and evolutionary perspectives. We developed a method for extracting spatial vein pattern data from leaf images, such as vein densities and also the sizes and shapes of the vein reticulations. We used this method to quantify leaf venation patterns of the first rosette leaf of Arabidopsis thaliana throughout a series of developmental stages. In particular, we characterized the size and shape of vein network areoles (loops), which enlarge and are split by new veins as a leaf develops. Pattern parameters varied in time and space. In particular, we observed a distal to proximal gradient in loop shape (length/width ratio) which varied over time, and a margin-to-center gradient in loop sizes. Quantitative analyses of vein patterns at the tissue level provide a two-way link between theoretical models of patterning and molecular experimental work to further explore patterning mechanisms during development. Such analyses could also be used to investigate the effect of environmental factors on vein patterns, or to compare venation patterns from different species for evolutionary studies. The method also provides a framework for gathering and overlaying two-dimensional maps of point, line and surface morphological data.

  6. Assessment and management of patients with varicose veins.

    Science.gov (United States)

    Allen, Louise

    Varicose veins are enlarged superficial veins found in the legs. This article explores the anatomy and physiology of the venous system to assist nurses to assess, manage and treat patients with varicose veins.

  7. Freedom from paroxysmal atrial fibrillation after successful pulmonary vein isolation with pulmonary vein ablation catheter-phased radiofrequency energy: 2-year follow-up and predictors of failure

    NARCIS (Netherlands)

    Mulder, A.A.W.; Wijffels, M.C.; Wever, E.F.; Boersma, L.V.

    2012-01-01

    AIMS: In patients with paroxysmal atrial fibrillation (PAF) the pattern of atrial fibrillation (AF) episodes and the total AF burden, may be related to the efficacy of pulmonary vein isolation (PVI). We evaluated (pre)-procedural factors explaining the long-term outcome after PVI, using a ring-shape

  8. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... public health professionals. More > Hand Hygiene Saves Lives (5:10) Recommend on Facebook Tweet Share Compartir Hand ... High resolution [22.9 MB] Open Captioned [14.5 MB] Request a higher resolution file Copy the ...

  9. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... future Salt Matters: Preserving Choice, Protecting Health More Information Hand Hygiene Clean Hands Basics Send Us Feedback ... 2013 Page last updated: November 22, 2013 Content source: Centers for Disease Control and Prevention Page maintained ...

  10. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... 22.9 MB] Open Captioned [14.5 MB] Request a higher resolution file Copy the code below ... future Salt Matters: Preserving Choice, Protecting Health More Information Hand Hygiene Clean Hands Basics Send Us Feedback ...

  11. Arthritis of the Hand

    Science.gov (United States)

    .org Arthritis of the Hand Page ( 1 ) The hand and wrist have multiple small joints that work together to ... a shoelace. When the joints are affected by arthritis, activities of daily living can be difficult. Arthritis ...

  12. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... Tricky Treats Hygiene Fight Germs. Wash Your Hands! Go with the Flow Hand Hygiene Saves Lives Wash ... Wes Studi: Signs (:30) Traveler’s Health Way to Go Way to Go: Many Healthy Returns (4:00) ...

  13. Radiological features of azygous vein aneurysm.

    Science.gov (United States)

    Choudhary, Arabinda Kumar; Moore, Michael

    2014-04-01

    Mediastinal masses are most commonly associated with malignancy. Azygous vein aneurysm is a very rare differential diagnosis of mediastinal mass. We report here three cases of azygous vein aneurysm including children and adult patients. In the pediatric patient it was further complicated by thrombosis and secondary pulmonary embolism. We describe the radiological features on CXR, MRI, CT, PET-CT, US and angiogram and their differential diagnosis. Imaging findings of continuity with azygous vein, layering of contrast medium on enhanced CT and dynamic MRA showing filling of the mass at the same time as the azygous vein without prior enhancement will be strongly suggestive of azygous vein aneurysm with transtracheal ultrasound being the definitive test in these patients. It is important to keep a vascular origin mass in the differential diagnosis of mediastinal masses. Also, in young healthy patients with pulmonary embolism, a vascular etiology such as azygous vein aneurysm should be carefully evaluated. This article will help the clinicians to learn about the imaging features of azygous vein aneurysm on different imaging modalities.

  14. Portal vein gas in emergency surgery

    Directory of Open Access Journals (Sweden)

    Mahmood Hind

    2008-07-01

    Full Text Available Abstract Background Portal vein gas is an ominous radiological sign, which indicates a serious gastrointestinal problem in the majority of patients. Many causes have been identified and the most important was bowel ischemia and mesenteric vascular accident. The presentation of patients is varied and the diagnosis of the underlying problem depends mainly on the radiological findings and clinical signs. The aim of this article is to show the clinical importance of portal vein gas and its management in emergency surgery. Methods A computerised search was made of the Medline for publications discussing portal vein gas through March 2008. Sixty articles were identified and selected for this review because of their relevance. These articles cover a period from 1975–2008. Results Two hundreds and seventy-five patients with gas in the portal venous system were reported. The commonest cause for portal vein gas was bowel ischemia and mesenteric vascular pathology (61.44%. This was followed by inflammation of the gastrointestinal tract (16.26%, obstruction and dilatation (9.03%, sepsis (6.6%, iatrogenic injury and trauma (3.01% and cancer (1.8%. Idiopathic portal vein gas was also reported (1.8%. Conclusion Portal vein gas is a diagnostic sign, which indicates a serious intra-abdominal pathology requiring emergency surgery in the majority of patients. Portal vein gas due to simple and benign cause can be treated conservatively. Correlation between clinical and diagnostic findings is important to set the management plan.

  15. Valsalva and gravitational variability of the internal jugular vein and common femoral vein: Ultrasound assessment

    Energy Technology Data Exchange (ETDEWEB)

    Beddy, P. [Department of Radiology, The Adelaide and Meath Hospital, Tallaght, Dublin 24 (Ireland)]. E-mail: pbeddy@eircom.net; Geoghegan, T. [Department of Radiology, The Adelaide and Meath Hospital, Tallaght, Dublin 24 (Ireland); Ramesh, N. [Department of Radiology, The Adelaide and Meath Hospital, Tallaght, Dublin 24 (Ireland); Buckley, O. [Department of Radiology, The Adelaide and Meath Hospital, Tallaght, Dublin 24 (Ireland); O' Brien, J. [Department of Radiology, The Adelaide and Meath Hospital, Tallaght, Dublin 24 (Ireland); Colville, J. [Department of Radiology, The Adelaide and Meath Hospital, Tallaght, Dublin 24 (Ireland); Torreggiani, W.C. [Department of Radiology, The Adelaide and Meath Hospital, Tallaght, Dublin 24 (Ireland)

    2006-05-15

    Purpose: Central venous cannulation via the common femoral vein is an important starting point for many interventions. The purpose of this study was to determine the optimum conditions for cannulation of the femoral vein and to compare these with the relative changes in the internal jugular vein. Methods: High-resolution 2D ultrasound was utilised to determine variability of the calibre of the femoral and internal jugular veins in 10 healthy subjects. Venous diameter was assessed during the Valsalva manoeuvre and in different degrees of the Trendelenburg position. Results: The Valsalva manoeuvre significantly increased the size of the femoral and internal jugular veins. There was a relatively greater increase in femoral vein diameter when compared with the internal jugular vein of 40 and 29%, respectively. Changes in body inclination (Trendelenburg position) did not significantly alter the luminal diameter of the femoral vein. However, it significantly increased internal jugular vein diameter. Conclusions: Femoral vein cannulation is augmented by the Valsalva manoeuvre but not significantly altered by the gravitational position of the subject.

  16. Hands in Systemic Disease

    Science.gov (United States)

    ... Z Videos Infographics Symptom Picker Anatomy Bones Joints Muscles Nerves Vessels Tendons About Hand Surgery What is a Hand Surgeon? What is ... nerves, skin and skin-related tissues, bones, and ... a systemic diseases. The hands may show changes noticed by the patient or ...

  17. Robotic hand and fingers

    Energy Technology Data Exchange (ETDEWEB)

    Salisbury, Curt Michael; Dullea, Kevin J.

    2017-06-06

    Technologies pertaining to a robotic hand are described herein. The robotic hand includes one or more fingers releasably attached to a robotic hand frame. The fingers can abduct and adduct as well as flex and tense. The fingers are releasably attached to the frame by magnets that allow for the fingers to detach from the frame when excess force is applied to the fingers.

  18. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... Matters: Preserving Choice, Protecting Health (4:30) Salt Matters: Preserving Choice, Protecting Health (2:00) Tricky Treats Hygiene Fight Germs. Wash Your Hands! Go with the Flow Hand Hygiene Saves Lives Wash Your Hands Physical Activity Knees Lifted High Making Health Easier: Active ...

  19. Drosophila Smad2 Opposes Mad Signaling during Wing Vein Development

    Science.gov (United States)

    Sander, Veronika; Eivers, Edward; Choi, Renee H.; De Robertis, Edward M.

    2010-01-01

    In the vertebrates, the BMP/Smad1 and TGF-β/Smad2 signaling pathways execute antagonistic functions in different contexts of development. The differentiation of specific structures results from the balance between these two pathways. For example, the gastrula organizer/node of the vertebrates requires a region of low Smad1 and high Smad2 signaling. In Drosophila, Mad regulates tissue determination and growth in the wing, but the function of dSmad2 in wing patterning is largely unknown. In this study, we used an RNAi loss-of-function approach to investigate dSmad2 signaling during wing development. RNAi-mediated knockdown of dSmad2 caused formation of extra vein tissue, with phenotypes similar to those seen in Dpp/Mad gain-of-function. Clonal analyses revealed that the normal function of dSmad2 is to inhibit the response of wing intervein cells to the extracellular Dpp morphogen gradient that specifies vein formation, as measured by expression of the activated phospho-Mad protein. The effect of dSmad2 depletion in promoting vein differentiation was dependent on Medea, the co-factor shared by Mad and dSmad2. Furthermore, double RNAi experiments showed that Mad is epistatic to dSmad2. In other words, depletion of Smad2 had no effect in Mad-deficient wings. Our results demonstrate a novel role for dSmad2 in opposing Mad-mediated vein formation in the wing. We propose that the main function of dActivin/dSmad2 in Drosophila wing development is to antagonize Dpp/Mad signaling. Possible molecular mechanisms for the opposition between dSmad2 and Mad signaling are discussed. PMID:20442782

  20. Ventriculoatrial shunting via the azygos vein.

    Science.gov (United States)

    Balasubramaniam, C; DuBois, J J; Laurent, J P; Pokorny, W J; Harberg, F J; Cheek, W R

    1990-06-01

    The treatment of hydrocephalus has evolved through many stages but the "cure" is still elusive. It is not unusual for the neurosurgeon to find that the commonly used routes for catheter placement or sites for drainage of cerebrospinal fluid (CSF) cannot be employed. The azygos vein was used to gain access to the right atrium when the CSF could not be drained into the peritoneal cavity, nor could the neck veins be used to place the catheter into the right atrium. The azygos vein is a convenient and safe route to reach the right atrium in selected patients.

  1. Portal Decompression Using the Inferior Mesenteric Vein

    Directory of Open Access Journals (Sweden)

    Paolo Gorini

    1998-01-01

    Full Text Available We report five patients with variceal hemorrhage, in three cases secondary to diffuse thrombosis of the portal, superior mesenteric and splenic veins. Mesenteric angiography demonstrated patency of the inferior mesenteric vein (IMV in each, and successful portal decompression by anastomosis of the IMV to the left renal vein (n=4 or the inferior vena cava (n=1 was accomplished. Bleeding was permanently controlled: four patients have survived from one to eight years post-operatively. Because shunt procedures utilizing the IMV are technically straightforward, subtotally decompress the portal system and avoid the right upper quadrant, they may be advantageous in certain clinical settings.

  2. [FEATURES LIVER TRANSPLANTATION IN PORTAL VEIN THROMBOSIS].

    Science.gov (United States)

    Abbasov, P A

    2015-07-01

    In 2012 - 2013 years in 265 patients for liver transplantation was performed, including in 224 (84.5%)--from a living donor, in 41 (15.5%)--from the dead body. Using a Foley catheter to stop bleeding, and the imposition of vascular sutures during endovenectomy in portal vein thrombosis (PVT) and its possible damage under all conditions. In particular, PVT IV degree (Grade IV) in order to restore blood flow in the graft using the left gastric and renal vein is an alternative, if they are cryopreserved vein may be suitably used.

  3. Varicose veins--Who should be referred?

    Science.gov (United States)

    Onida, Sarah; Davies, Alun H; Franklin, Ian

    2015-11-01

    Varicose veins are a common, progressive condition in the UK, with significant negative effects on patients' quality of life. Despite their prevalence, access to secondary care for the assessment and treatment of varicose veins can be variable throughout the country.The National Institute of Health and Care Excellence guidelines developed in 2013 provide evidence-based guidance on the referral, assessment, and management of the patient with venous disease.In this article, we review the development of the guidelines for the management of varicose veins over the last 15 years, highlighting the latest changes in referral criteria.

  4. Spoof Detection for Finger-Vein Recognition System Using NIR Camera

    Directory of Open Access Journals (Sweden)

    Dat Tien Nguyen

    2017-10-01

    Full Text Available Finger-vein recognition, a new and advanced biometrics recognition method, is attracting the attention of researchers because of its advantages such as high recognition performance and lesser likelihood of theft and inaccuracies occurring on account of skin condition defects. However, as reported by previous researchers, it is possible to attack a finger-vein recognition system by using presentation attack (fake finger-vein images. As a result, spoof detection, named as presentation attack detection (PAD, is necessary in such recognition systems. Previous attempts to establish PAD methods primarily focused on designing feature extractors by hand (handcrafted feature extractor based on the observations of the researchers about the difference between real (live and presentation attack finger-vein images. Therefore, the detection performance was limited. Recently, the deep learning framework has been successfully applied in computer vision and delivered superior results compared to traditional handcrafted methods on various computer vision applications such as image-based face recognition, gender recognition and image classification. In this paper, we propose a PAD method for near-infrared (NIR camera-based finger-vein recognition system using convolutional neural network (CNN to enhance the detection ability of previous handcrafted methods. Using the CNN method, we can derive a more suitable feature extractor for PAD than the other handcrafted methods using a training procedure. We further process the extracted image features to enhance the presentation attack finger-vein image detection ability of the CNN method using principal component analysis method (PCA for dimensionality reduction of feature space and support vector machine (SVM for classification. Through extensive experimental results, we confirm that our proposed method is adequate for presentation attack finger-vein image detection and it can deliver superior detection results compared

  5. Does correlated color temperature affect the ability of humans to identify veins?

    DEFF Research Database (Denmark)

    Argyraki, Aikaterini; Clemmensen, Line Katrine Harder; Petersen, Paul Michael

    2016-01-01

    In the present study we provide empirical evidence and demonstrate statistically that white illumination settings can affect the human ability to identify veins in the inner hand vasculature. A special light-emitting diode lamp with high color rendering index (CRI 84–95) was developed and the eff......In the present study we provide empirical evidence and demonstrate statistically that white illumination settings can affect the human ability to identify veins in the inner hand vasculature. A special light-emitting diode lamp with high color rendering index (CRI 84–95) was developed...... and the effect of correlated color temperature was evaluated, in the range between 2600 and 5700 K at an illuminance of 40 9 lx on the ability of adult humans to identify veins. It is shown that the ability to identify veins can, on average, be increased up to 24% when white illumination settings that do...... not resemble incandescent light are applied. The illuminance reported together with the effect of white illumination settings on direct visual perception of biosamples are relevant for clinical investigations during the night. © 2015 Optical Society of America...

  6. Physiological interpretations of radiographic findings on malformations of small veins: seriality of cisterns, communications to systemic veins and relationship to muscles

    Science.gov (United States)

    Morita, Nobuo; Terada, Tomoaki; Sato, Morio; Sonomura, Tetsuo

    2014-01-01

    Objectives To re-evaluate the fluoroscopic findings of venous malformation by cine mode cisternography. Methods Using direct injection cine-cisternography, we studied 49 venous malformation lesions in the head and neck of 30 patients who were scheduled to undergo ethanol sclerotherapy. The diameter of definitively measurable 46 lesions was 21.7 ± 10.5 mm (mean ± SD, range: 6.0–48.0 mm). The injection was continued until the draining veins were clearly observed. Outflow communications between cisterns and systemic veins were classified into Type 1, no visible drainage; Type 2, draining into a normal venous system; and Type 3, with abnormally ectatic draining veins. The topological relationships of the lesions to surrounding structures were addressed using computed tomography, magnetic resonance imaging or ultrasonogram. Treatment results were evaluated. Results The direct injection cine-cisternography showed the typical ‘bunch of grapes’ pattern, and revealed serial cisternal, followed by the appearance of outflow/draining veins in all lesions. There were no Type 1, 47 Type 2 and two Type 2 outflow pattern. Satellite lesions emerged via the communicating veins in six lesions. Of the all 49 lesions, 48 were located in or on the muscle fascia. Sclerotherapy was safely completed in all Type 2 lesions with satisfactory results, but for the Type 3 lesions treatment was limited to be partial to avoid complications. Conclusions The present study suggested that communications from venous malformation to the systemic vein are fluoroscopically confirmable. These radiographic findings were thought explainable in relation to developmental nature or facilitating process of venous malformation. PMID:23223003

  7. [Retinal vein occlusion in a young patient].

    Science.gov (United States)

    Zemba, Mihail; Ochinciuc, Uliana; Sarbu, Laura; Avram, Corina; Camburu, Raluca; Stamate, Alina

    2013-01-01

    We present a case report of a 27 years old pacient with central retinal vein occlussion and macular edema. The pacient has a significant reduction of the macular aedema with complete recovery of vision after the treatment.

  8. Vein of Galen Malformation: Outcome after Embolization

    Directory of Open Access Journals (Sweden)

    J Gordon Millichap

    2003-12-01

    Full Text Available The neurodevelopmental outcome after endovascular treatment of vein of Galen malformation (VOGM in 27 patients seen between 1983 and 2002 was assessed by chart review and parental questionnaires at the University of California, San Francisco.

  9. [Ultrasonic guided cannulation of the axillary vein in intensive care patients].

    Science.gov (United States)

    Schregel, W; Höer, H; Radtke, J; Cunitz, G

    1994-10-01

    attempted CV catheters, 43 were placed successfully. In 2 cases the axillary vein could not be encountered by the puncture needle. Guide-wire placement did not succeed in 4 patients. One catheter was malpositioned in the ipsilateral internal jugular vein. Four inadvertent punctures of the axillary artery remained without sequelae after compression. No further puncture-related complications were observed. With high US intensity score the number of puncture attempts necessary for successful vein cannulation was lower. On the other hand, complications and puncture failure seemed to be more frequent in patients with lower US intensity scores. DISCUSSION. CV access via the axillary vein had a satisfying success rate (43/50) and proved to be a safe procedure in our ICU patients despite higher risk factors compared to a healthy population. Although ethical reasons did not allow a randomised comparison with the standard technique, location of the axillary vein by Doppler US is likely to improve cannulation results and reduce complications induced by "blind" needle probing. With a low US intensity score, the rate of successful punctures is lower and complication rates increase. In some patients, e.g., those with extended tumour operations involving the head and neck, CV access via the axillary vein may be of high clinical value.

  10. Efficacy of varicose vein surgery with preservation of the great safenous vein

    Directory of Open Access Journals (Sweden)

    Bernardo Cunha Senra Barros

    2015-04-01

    Full Text Available OBJECTIVE: To evaluate the efficacy of surgical treatment of varicose veins with preservation of the great saphenous vein. METHODS: We conducted a prospective study of 15 female patients between 25 and 55 years of age with clinical, etiologic, anatomic and pathophysiologic (CEAP classification 2, 3 and 4. The patients underwent surgical treatment of primary varicose veins with great saphenous vein (GSV preservation. Doppler ultrasonography exams were carried out in the first and third months postoperatively. The form of clinical severity of venous disease, Venous Clinical Severity Score (VCSS was completed before and after surgery. We excluded patients with history of deep vein thrombosis, smoking or postoperatively use of elastic stockings or phlebotonics. RESULTS: All patients had improved VCSS (p <0.001 and reduction in the diameter of the great saphenous vein (p <0.001. There was a relationship between VCSS and the GSV caliber, as well as with preoperative CEAP. There was improvement in CEAP class in nine patients when compared with the preoperative period (p <0.001. CONCLUSION: The varicose vein surgery with preservation of the great saphenous vein had beneficial effects to the GSV itself, with decreasing caliber, and to the symptoms when the vein had maximum caliber of 7.5 mm, correlating directly with the CEAP. The decrease in GSV caliber, even without complete abolition of reflux, leads to clinical improvement by decreasing the reflux volume.

  11. Isolated inferior mesenteric portal hypertension with giant inferior mesenteric vein and anomalous inferior mesenteric vein insertion

    Directory of Open Access Journals (Sweden)

    G Raghavendra Prasad

    2013-01-01

    Full Text Available Extrahepatic portal hypertension is not an uncommon disease in childhood, but isolated inferior mesenteric portal varices and lower gastrointestinal (GI bleed have not been reported till date. A 4-year-old girl presented with lower GI bleed. Surgical exploration revealed extrahepatic portal vein obstruction with giant inferior mesenteric vein and colonic varices. Inferior mesenteric vein was joining the superior mesenteric vein. The child was treated successfully with inferior mesenteric - inferior vena caval anastomosis. The child was relieved of GI bleed during the follow-up.

  12. Crack - seal veins - what we learnt since the seminal work of John Ramsay

    Science.gov (United States)

    Urai, Janos L.; Bons, Paul D.

    2017-04-01

    In the nineteen-eighties, John Ramsay and co-workers have laid the basis for much of our current understanding of tectonic veins, by proposing that tectonic veins accrete in many small increments of cracking and sealing, making the link to cyclic stress and fluid pressure cycles and the earthquake cycle, and by proposing that fibrous veins track the opening trajectory, which has created a toolbox to analyse progressive deformation in rocks. They recognised syntaxial and antitaxial veins, which grow depending on the composition of the wall rock and the vein. Following on these seminal contributions, advances in analysing the microstructure and chemical signature in crack-seal veins made a lot of progress, facilitated by the rapid increase in micro analytical tools like cathodeluminescence and EBSD. Initial modelling of crystal growth in crack- seal veins provided an explanation of how crystals become fibrous without being deformed and explained how fibres sometimes do and sometimes don't follow the opening trajectory. This was followed by numerical models of crystal growth to study the development of crystal facets after larger crack increments, and experimental study of the sealing dynamics of syntaxial veins. These models were initially kinematic, using the ELLE microdynamic simulation package, and more recently incorporating the physics of the growing interface using the Phase Field method, which now allows 3D simulation of both syntaxial and antitaxial veins and can simultaneously compute the evolving permeability of the crack using Lattice Boltzmann techniques. Parallel to these developments we developed an understanding of the strength of the vein cement, and, using Discrete Element Techniques, explored the effects of differences of the strength of the vein and its adhesion to the wall rock on fracture patterns in crack-seal systems in changing stress fields. This presentation will review these developments, showing how the ideas of John Ramsay inspired follow

  13. CT in thrombosed dilated posterior epidural vein

    Energy Technology Data Exchange (ETDEWEB)

    Bammatter, S.; Schnyder, P.; Preux, J. de

    1987-05-01

    The authors report a case of thrombosis of the distal end of an enlarged right posterior epidural vein. The patient had a markedly narrow lumbar canal due to L5 spondylolisthesis. The dilated vein and the thrombosis were displayed by computed tomography but remained unrecognized until surgery. Pathogenesis of this condition is discussed. A review of the English, French and German literature revealed no prior radiological reports of a similar condition.

  14. Primary leiomyosarcoma of the innominate vein.

    Science.gov (United States)

    Illuminati, Giulio; Miraldi, Fabio; Mazzesi, Giuseppe; D'urso, Antonio; Ceccanei, Gianluca; Bezzi, Marcello

    2007-01-01

    Primary venous leiomyosarcoma is rare. We report the case of a primary leiomyosarcoma of the left innominate vein, with neoplastic thrombus extending into the left jugular and subclavian veins. The tumor was curatively resected en bloc with anterior mediastinal and laterocervical lymphatics, through a median sternotomy prolonged into left cervicotomy. Primary venous sarcomas may be associated with prolonged survival in individual cases, with curative resection recommended as the standard treatment, in the absence of distant spread.

  15. The umbilical and paraumbilical veins of man.

    OpenAIRE

    Martin, B F; Tudor, R G

    1980-01-01

    During its transit through the umbilicus structural changes occur in the thick wall of the extra-abdominal segment of the umbilical vein whereby the components of the intra-abdominal segment acquire an essentially longitudinal direction and become arranged in fibro-elastic and fibro-muscular zones. The vein lumen becomes largely obliterated by asymmetrical proliferation of loose subendothelial conective tissue. The latter forms a new inner zone within which a small segment of the lumen persis...

  16. Branch Retinal Vein Occlusion and Its Management

    Institute of Scientific and Technical Information of China (English)

    Desmond; Archer

    1992-01-01

    The natural course of Branch Retinal Vein Occlusion is determined by the site and completeness of the occlusion, the integrity of arterial perfusion to the affected sector and the efficiency of the developing collateral circulation. Most patients with tributary vein occlusion have some capillary fall out and microvascular incompetence in the distribution of the affected retina and vision is significantly compromised in over 50% of patients who have either chronic macular oedema or ischemia involving the...

  17. Doppler waveforms of the hepatic veins in children with diffuse fatty infiltration of the liver

    Energy Technology Data Exchange (ETDEWEB)

    Uzun, Hakan [Duzce University School of Medicine, Department of Pediatrics, Konuralp, Duzce 81620 (Turkey); Yazici, Burhan [Duzce University School of Medicine, Department of Radiology, Konuralp, Duzce 81620 (Turkey)], E-mail: dryazici@yahoo.com; Erdogmus, Besir [Duzce University School of Medicine, Department of Radiology, Konuralp, Duzce 81620 (Turkey); Kocabay, Kenan [Duzce University School of Medicine, Department of Pediatrics, Konuralp, Duzce 81620 (Turkey); Buyukkaya, Ramazan; Buyukkaya, Ayla; Yazgan, Omer [Duzce University School of Medicine, Department of Radiology, Konuralp, Duzce 81620 (Turkey)

    2009-09-15

    Objective: The aim of this study was to investigate the effect of fatty infiltration of the liver (FIL) on the Doppler waveform pattern in the hepatic veins of obese children. Methods: In this prospective study, 59 patients with diffuse FIL and 45 normal healthy children who served as control group underwent hepatic vein B-mod and duplex Doppler sonography. The Doppler sonography spectrum of the right hepatic vein was classified into three groups: triphasic waveform, biphasic waveform, and monophasic or flat waveform. Results: There was a statistically significant difference in the phasicity of hepatic venous flow between patients and control subjects (p < 0.001). The Doppler flow pattern in the right hepatic vein was triphasic in 28 (47.5%), biphasic in 28 (47.5%), and monophasic in 3 (5%) children with fatty liver, while it was triphasic in 43 (95.6%) and biphasic in 2 (4.4%) control subjects. There was an inverse correlation between the sonographic grade of fatty infiltration of the liver and the phasicity of hepatic venous flow (r = -0.479, p < 0.001). Conclusions: Abnormal right hepatic vein Doppler waveform, biphasic as well as monophasic, can be seen in healthy obese children with diffuse FIL.

  18. Endovascular treatment of iliac vein compression syndrome

    Institute of Scientific and Technical Information of China (English)

    MENG Qing-you; LI Xiao-qiang; QIAN Ai-min; SANG Hong-fei; RONG Jian-jie; ZHU Li-wei

    2011-01-01

    Background Iliac vein compression syndrome (IVCS),the symptomatic compression of the left common iliac vein between the right common iliac artery and the vertebrae,is not an uncommon condition.The aim of this research was to retrospectively evaluate long-term outcome and the significance of endovascular treatment in patients with left IVCS.Methods Between January 1997 and September 2008,296 patients received interventional therapy in the left common iliac vein.In the second stage,170 cases underwent saphenous vein high ligation and stripping.Two hundred and thirty-one cases were followed up over a period of 6 to 120 months (average 46 months) and evaluated for symptom improvement with color ultrasound and ascending venography.Results The stenotic or occlusive segments of the left iliac vein were successfully dilated in 285 cases,of whom 272 received stent implantation therapy.Most of the patients achieved satisfactory results on discharge.During the follow-up period,varicose veins were alleviated in 98.7% of the patients,and leg swelling disappeared or was obviously relieved in 84% of cases.About 85% of leg ulcers completely healed.The total patency rate was 91.7% as evaluated with color ultrasound and 91.5% with ascending venography.Conclusions Endovascular treatment of IVCS provides effective symptomatic improvement and good long-term patency in most patients.

  19. Portal vein thrombosis in children and adolescents.

    Science.gov (United States)

    Schettino, Graziela C M; Fagundes, Eleonora D T; Roquete, Mariza L V; Ferreira, Alexandre R; Penna, Francisco J

    2006-01-01

    To review the literature on portal vein thrombosis in children and adolescents, focusing on its diagnosis, complications and treatment. The medical literature of the past 10 years was reviewed using the PubMed and MEDLINE search engines, with major focus on portal vein thrombosis and its clinical outcomes. The following keywords or expressions were used for the web search: portal vein thrombosis, extra-hepatic portal vein obstruction, prognosis, children, portal hypertension, esophagogastric varices. Additionally, we also reviewed the articles cited in the references of the initially selected papers, as well as relevant textbooks. Portal vein thrombosis is one of the most common causes of portal hypertension among children. The initial clinical manifestation is characterized either by episodes of upper gastrointestinal bleeding or by splenomegaly on routine clinical examination. The major complications include upper gastrointestinal bleeding, hypersplenism secondary to splenomegaly, growth retardation, and portal biliopathy. The diagnosis is made by abdominal Doppler ultrasonography. Treatment is targeted at the complications and includes primary and secondary prophylaxis against upper gastrointestinal bleeding (which results from the rupture of esophageal varices), and portosystemic shunting in selected cases. Portal vein thrombosis is one of the major triggers of upper gastrointestinal bleeding in children. Bleeding episodes have a remarkable effect on the quality of life of affected patients. Thus, appropriate diagnosis and treatment are needed in order to reduce morbidity and mortality.

  20. Evaluation of leg varicose veins by MR venography

    Energy Technology Data Exchange (ETDEWEB)

    Kojima, Yoshifumi; Shiraishi, Tomokuni; Taira, Mitsuru [Kansai Medical Univ., Neyagawa, Osaka (Japan). Kohri Hospital; Imamura, Atsushi; Yamada, Hitoshi; Okuno, Masafumi; Kamiyama, Yasuo

    1998-11-01

    Preoperative evaluation was conducted on 30 patients with leg varicose veins by MR venography (MRV), and compared with conventional venography, MR images were performed by the 3D-SMASH Method. Compared with venography, MRV could more clearly demonstrate leg varicose veins with perforating veins than venography. It could detected fine varicose veins more than 2 mm in diameter, and deep veins. Furthermore, 3D observation enables accurate detection of the location of perforating vein. In conclusion, MRV is useful for the diagnosis of leg varicose vein. (author)

  1. Scattering removal for finger-vein image restoration.

    Science.gov (United States)

    Yang, Jinfeng; Zhang, Ben; Shi, Yihua

    2012-01-01

    Finger-vein recognition has received increased attention recently. However, the finger-vein images are always captured in poor quality. This certainly makes finger-vein feature representation unreliable, and further impairs the accuracy of finger-vein recognition. In this paper, we first give an analysis of the intrinsic factors causing finger-vein image degradation, and then propose a simple but effective image restoration method based on scattering removal. To give a proper description of finger-vein image degradation, a biological optical model (BOM) specific to finger-vein imaging is proposed according to the principle of light propagation in biological tissues. Based on BOM, the light scattering component is sensibly estimated and properly removed for finger-vein image restoration. Finally, experimental results demonstrate that the proposed method is powerful in enhancing the finger-vein image contrast and in improving the finger-vein image matching accuracy.

  2. Multimodal Biometrics Based on Fingerprint and Finger Vein

    Directory of Open Access Journals (Sweden)

    Anand Viswanathan

    2014-07-01

    Full Text Available Biometric systems identify a person through physical traits or verify his/her identity through automatic processes. Various systems were used over years including systems like fingerprint, iris, facial images, hand geometry and speaker recognition. For biometric systems successful implementation, it has to address issues like efficiency, accuracy, applicability, robustness and universality. Single modality based recognition verifications are not robust while combining information from different biometric modalities ensures better performance. Multimodal biometric systems use multiple biometrics and integrate information for identification. It compensates unimodal biometric systems limitations. This study considers multimodal biometrics based on fingerprint and finger veins. Gabor features are extracted from finger vein using Gabor filter with orientation of 0, 15, 45, 60 and 75°, respectively. For fingerprint images, energy coefficients are attained using wavelet packet tree. Both features are normalized using min max normalization and fused with concatenation. Feature selection is through PCA and kernel PCA. Classification is achieved through KNN, Naïve Bayes and RBF Neural Network Classifiers.

  3. Hand eczema classification

    DEFF Research Database (Denmark)

    Diepgen, T L; Andersen, Klaus Ejner; Brandao, F M;

    2008-01-01

    Summary Background Hand eczema is a long-lasting disease with a high prevalence in the background population. The disease has severe, negative effects on quality of life and sometimes on social status. Epidemiological studies have identified risk factors for onset and prognosis, but treatment...... of the disease is rarely evidence based, and a classification system for different subdiagnoses of hand eczema is not agreed upon. Randomized controlled trials investigating the treatment of hand eczema are called for. For this, as well as for clinical purposes, a generally accepted classification system...... for hand eczema is needed. Objectives The present study attempts to characterize subdiagnoses of hand eczema with respect to basic demographics, medical history and morphology. Methods Clinical data from 416 patients with hand eczema from 10 European patch test clinics were assessed. Results...

  4. From vein precipitates to deformation and fluid rock interaction within a SSZ: Insights from the Izu-Bonin-Mariana fore arc

    Science.gov (United States)

    Micheuz, Peter; Quandt, Dennis; Kurz, Walter

    2017-04-01

    International Ocean Discovery Program (IODP) expeditions 352 and 351 drilled through oceanic crust of the Philippine Sea plate. The two study areas are located near the outer Izu-Bonin-Mariana (IBM) fore arc and in the Amami Sankaku Basin. The primary objective was to improve our understanding of supra-subduction zones (SSZ) and the process of subduction initiation. The recovered drill cores during IODP expedition 352 represent approximately 50 Ma old fore arc basalts (FAB) and boninites revealing an entire volcanic sequence of a SSZ. Expedition 351 drilled FAB like oceanic crust similar in age to the FABs of expedition 352. In this study we present data on vein microstructures, geochemical data and isotopic signatures of vein precipitates to give new insights into fluid flow and precipitation processes and deformation within the Izu-Bonin fore arc. Veins formed predominantly as a consequence of hydrofracturing resulting in the occurrence of branched vein systems and brecciated samples. Along these hydrofractures the amount of altered host rock fragments varies and locally alters the host rock completely to zeolites and carbonates. Subordinately extensional veins released after the formation of the host rocks. Cross-cutting relationships of different vein types point to multiple fracturing events subsequently filled with minerals originating from a fluid with isotopic seawater signature. Based on vein precipitates, their morphology and their growth patterns four vein types have been defined. Major vein components are (Mg-) calcite and various zeolites determined by Raman spectra and electron microprobe analyses. Zeolites result from alteration of volcanic glass during interaction with a seawaterlike fluid. Type I veins which are characterized by micritic infill represent neptunian dykes. They predominantly occur in the upper levels of drill cores being the result of an initial volume change subsequently to crystallization of the host rocks. Type II veins are

  5. Hand deburring guide

    Energy Technology Data Exchange (ETDEWEB)

    Gillespie, L.K.

    1979-07-01

    Appropriate hand deburring techniques have always been difficult to define because of the infinite variety of part shapes, sizes, materials, and burr conditions. This guide, however, has been prepared to assist those responsible for hand deburring. The purpose of the guide is to define Bendix Kansas City burr specifications and inspection practices; to define the results of practical tests on hand deburring; to define some typical in-house practices; and to define the in-house tools available for this work.

  6. The alien hand syndrome

    Science.gov (United States)

    Panikkath, Deepa; Mojumder, Deb; Nugent, Kenneth

    2014-01-01

    A 77-year-old woman presented with the complaint of observing her left hand moving without her knowledge while watching television. Her left hand stroked her face and hair as if somebody was controlling it. These movements lasted only half an hour but on recovery, she had left hemiparesis. Alien hand syndrome as the presentation of cardioembolic stroke is extremely rare but can be terrifying to patients. PMID:24982566

  7. Scattering Removal for Finger-Vein Image Restoration

    OpenAIRE

    Jinfeng Yang; Ben Zhang; Yihua Shi

    2012-01-01

    Finger-vein recognition has received increased attention recently. However, the finger-vein images are always captured in poor quality. This certainly makes finger-vein feature representation unreliable, and further impairs the accuracy of finger-vein recognition. In this paper, we first give an analysis of the intrinsic factors causing finger-vein image degradation, and then propose a simple but effective image restoration method based on scattering removal. To give a proper description of f...

  8. An effective preprocessing method for finger vein recognition

    Science.gov (United States)

    Peng, JiaLiang; Li, Qiong; Wang, Ning; Abd El-Latif, Ahmed A.; Niu, Xiamu

    2013-07-01

    The image preprocessing plays an important role in finger vein recognition system. However, previous preprocessing schemes remind weakness to be resolved for the high finger vein recongtion performance. In this paper, we propose a new finger vein preprocessing that includes finger region localization, alignment, finger vein ROI segmentation and enhancement. The experimental results show that the proposed scheme is capable of enhancing the quality of finger vein image effectively and reliably.

  9. Nutcracker Syndrome Complicated by Left Renal Vein Thrombosis

    Directory of Open Access Journals (Sweden)

    Faouzi Mallat

    2013-01-01

    Full Text Available Isolated renal vein thrombosis is a rare entity. We present a patient whose complaint of flank pain led to the diagnosis of a renal vein thrombosis. In this case, abdominal computed tomography angiography was helpful in diagnosing the nutcracker syndrome complicated by the renal vein thrombosis. Anticoagulation was started and three weeks later, CTA showed complete disappearance of the renal vein thrombosis. To treat the Nutcracker syndrome, we proposed left renal vein transposition that the patient consented to.

  10. Nutcracker syndrome complicated by left renal vein thrombosis.

    Science.gov (United States)

    Mallat, Faouzi; Hmida, Wissem; Jaidane, Mehdi; Mama, Nadia; Mosbah, Faouzi

    2013-01-01

    Isolated renal vein thrombosis is a rare entity. We present a patient whose complaint of flank pain led to the diagnosis of a renal vein thrombosis. In this case, abdominal computed tomography angiography was helpful in diagnosing the nutcracker syndrome complicated by the renal vein thrombosis. Anticoagulation was started and three weeks later, CTA showed complete disappearance of the renal vein thrombosis. To treat the Nutcracker syndrome, we proposed left renal vein transposition that the patient consented to.

  11. Derivative Sign Patterns

    Science.gov (United States)

    Clark, Jeffrey

    2011-01-01

    Analysis of the patterns of signs of infinitely differentiable real functions shows that only four patterns are possible if the function is required to exhibit the pattern at all points in its domain and that domain is the set of all real numbers. On the other hand all patterns are possible if the domain is a bounded open interval.

  12. Derivative Sign Patterns

    Science.gov (United States)

    Clark, Jeffrey

    2011-01-01

    Analysis of the patterns of signs of infinitely differentiable real functions shows that only four patterns are possible if the function is required to exhibit the pattern at all points in its domain and that domain is the set of all real numbers. On the other hand all patterns are possible if the domain is a bounded open interval.

  13. Hand Hygiene: An Update.

    Science.gov (United States)

    Bolon, Maureen K

    2016-09-01

    The medical field has long recognized the importance of hand hygiene in preventing health care-associated infections, yet studies indicate that this important task is performed only 40% of the time. Health care workers cite several barriers to optimal performance of hand hygiene, but the time required to perform this task is foremost among them. Introduction of alcohol-based hand rubs, bundled interventions, and incorporation of technologies designed to monitor and promote hand hygiene all represent promising advances in this field. Copyright © 2016 Elsevier Inc. All rights reserved.

  14. [Optimizing surgical hand disinfection].

    Science.gov (United States)

    Kampf, G; Kramer, A; Rotter, M; Widmer, A

    2006-08-01

    For more than 110 years hands of surgeons have been treated before a surgical procedure in order to reduce the bacterial density. The kind and duration of treatment, however, has changed significantly over time. Recent scientific evidence suggests a few changes with the aim to optimize both the efficacy and the dermal tolerance. Aim of this article is the presentation and discussion of new insights in surgical hand disinfection. A hand wash should be performed before the first disinfection of a day, ideally at least 10 min before the beginning of the disinfection as it has been shown that a 1 min hand wash significantly increases skin hydration for up to 10 min. The application time may be as short as 1.5 min depending on the type of hand rub. Hands and forearms should be kept wet with the hand rub for the recommended application time in any case. A specific rub-in procedure according to EN 12791 has been found to be suitable in order to avoid untreated skin areas. The alcohol-based hand rub should have a proven excellent dermal tolerance in order to ensure appropriate compliance. Considering these elements in clinical practice can have a significant impact to optimize the high quality of surgical hand disinfection for prevention of surgical site infections.

  15. Classification of Left-Right Hand Motor Imagery Electroencephalogram Signals Based on a Feature Extraction Common Spatial Pattern Algorithm%基于共空间模式的运动想象脑电信号识别研究

    Institute of Scientific and Technical Information of China (English)

    潘赛虎; 李文杰; 张义

    2014-01-01

    Classification of electroencephalogram(EEG)signal is an important issue in brain-computer interface(BCI). Based on the classification of the EEG signals,in this paper,we collect the left-right hand motor imagery EEG data of 7 subjects which are recorded by EGI-64 scalp electrodes placed according to the international 10/20 system. Firstly,the EEG data are denoised with extend Infomax-Independent Component Analysis ( ICA );Secondly, C3 and C4 electrodes features are extracted by using Common Spatial Pattern( CSP);Finally,the average classification rates of Fisher Linear Discriminant Analysis(FLDA),Bayesian,Radial Basis Function(RBF)neural network and BP neural network methods are compared. The classification results show that the average classification rate of neural network is higher than the other two methods,and that the average classification rate of BP neural network can be up to 95. 36%,but the other three methods of running velocity is obviously faster than the BP neural network. The results provide a basis for real-time BCI system implementation.%脑-机接口技术领域的关键问题是脑电信号的分类识别研究.本文针对脑电信号的分类问题,基于EGI-64导脑电采集系统得到7名被试者的左右手运动想象脑电数据,首先采用扩展Infomax-ICA方法对脑电数据进行去噪处理;然后利用共空间模式方法对C3/C42个电极的脑电信号进行特征提取;最后比较了Fisher线性判别分析法、贝叶斯方法、径向神经网络和BP神经网络几种算法的平均分类率.结果表明:神经网络分类方法得到的平均分类率要高于其他2种方法,而BP神经网络方法的平均分类率最高,可以达到95.36%,但另外3种方法的运行速度明显高于BP神经网络.该结果为实时BCI系统实施提供了一定依据.

  16. Static hand gesture recognition from a video

    Science.gov (United States)

    Rokade, Rajeshree S.; Doye, Dharmpal

    2011-10-01

    A sign language (also signed language) is a language which, instead of acoustically conveyed sound patterns, uses visually transmitted sign patterns to convey meaning- "simultaneously combining hand shapes, orientation and movement of the hands". Sign languages commonly develop in deaf communities, which can include interpreters, friends and families of deaf people as well as people who are deaf or hard of hearing themselves. In this paper, we proposed a novel system for recognition of static hand gestures from a video, based on Kohonen neural network. We proposed algorithm to separate out key frames, which include correct gestures from a video sequence. We segment, hand images from complex and non uniform background. Features are extracted by applying Kohonen on key frames and recognition is done.

  17. [Calcified deep vein thrombosis in a patient with recurrent deep vein thrombosis and sarcoidosis].

    Science.gov (United States)

    Krmek, Dubravka Zupanić; Brajković, Ivana; Bekić, Dinko; Krnić, Antun; Jurković, Petar; Pavlović, Tomislav

    2013-12-01

    In this article, we present a rare case of calcified deep vein thrombosis in a 42-year-old female patient with frequent relapses of pulmonary sarcoidosis since 1995, for which she was on maintenance therapy with corticosteroids and with consequential secondary diabetes. Recent femoral vein thrombosis was diagnosed with color Doppler in 2012. At the same time, calcified occlusive thrombus in vena cava inferior from the level of renal vein to the confluence of hepatic veins was diagnosed on abdominal multi-slice computed tomography (MSCT). Digital subtraction venography (DSV) revealed a well-developed collateral circulation through the paravertebral veins, azygos and hemiazygos vein. There were no risk factors for thrombosis other than sarcoidosis and diabetes. Deep vein thrombosis is rarely described with sarcoidosis, but according to literature reports, it usually appears as a recurrence and simultaneously at multiple locations. According to the current knowledge, we cannot say for sure whether it is a disease with an increased risk of deep vein thrombosis or there is a combination of multiple risk factors present simultaneously.

  18. [Hand surgery training].

    Science.gov (United States)

    Moutet, F; Haloua, J P

    2003-10-01

    Training of the hand surgeon HAND SURGEON A CONCEPT: The hand surgeon is supposed to be in charge of all the hand lesions regarding, skeleton, muscles, tendons, nerves and vessels. He has to be able to insure reparation and coverage of all of them. So he is involved in all the structures, which insure integrity and function of the hand. PURPOSE AND WAYS OF TRAINING: To obtain the asked ability, the hand surgeon training has to be global and sustained by two underlying surgical specialities: orthopedic surgery and plastic and reconstructive surgery. From 2000 after many years of dealings, a Right to the Title in Hand Surgery was born. This Right to the Title wants to be the formal recognition of the specific training of the hand surgeon. For the well-recognized ancient hand surgeons they need to be confirmed by one's peers. Now a day the hand surgeon has to satisfy to this specific training: Passed the complete training and exam of the Orthopedic or Plastic surgery board. Spent at least 6 months as resident in the other underlying specialty. Passed a microsurgery examination. Passed one of the four national Hand Surgery diplomas (DIU/Inter-Universitary Diploma). The examinations have been harmonized. A common formation is delivered regarding hand surgery, the way of examination is the same and the formation is 2 years long. The final exam is presented in front of board of examiners where a teacher of one of the other three national diplomas is present. Spent at least 2 years in a formative hand surgery unit, listed by the French College of Hand Surgeons, as senior surgeon. Those requirements are heavy to assume and need a heavy personal involvement. That seems to be necessary to have an ability level as high as possible. Emergency surgery practice is absolutely necessary in this training. All the 17 university formative hand surgery units listed by the French College of Hand Surgeons are members of the FESUM (European Federation of the Emergency Hand Units

  19. Reconstruction of hand contracture by reverse ulnar perforator flap

    Directory of Open Access Journals (Sweden)

    Cengiz Eser

    2016-04-01

    Full Text Available Hand burn scar contractures affect patients in aesthetic and functional aspects. After releasing these scars, the defects should be repaired. The reconstruction methods include primary suturation, Z plasty, skin grafting, local or free flaps, etc. All methods have their own advantages and disadvantages. One of the most useful flaps is the reverse ulnar perforator flap. We performed a two-staged procedure for repairing a post-burn contracture release defect in a 40-year-old male. In the first stage we applied reverse ulnar perforator flap for the hand defect, and ulnar artery and vein repair in the second stage. In conclusion, this two-staged procedure is a non-primary but useful option for hand and finger defects and prevents major vascular structure damage of the forearm. [Hand Microsurg 2016; 5(1.000: 40-43

  20. Wash Your Hands

    Science.gov (United States)

    ... don't have soap and clean, running water? Washing hands with soap and water is the best way to get rid of germs in most situations. If soap and water are not available, use an alcohol-based hand sanitizer [423 KB] that contains at least 60% alcohol. ...

  1. Pneumatically actuated hand tool

    NARCIS (Netherlands)

    Cool, J.C.; Rijnsaardt, K.A.

    1996-01-01

    Abstract of NL 9401195 (A) Pneumatically actuated hand tool for carrying out a mechanical operation, provided with an exchangeable gas cartridge in which the gas which is required for pneumatic actuation is stored. More particularly, the hand tool is provided with at least one pneumatic motor, at

  2. HAND INJURIES IN VOLLEYBALL

    NARCIS (Netherlands)

    BHAIRO, NH; NIJSTEN, MWN; VANDALEN, KC; TENDUIS, HJ

    We studied the long-term sequelae of hand injuries as a result of playing volleyball. In a retrospective study, 226 patients with injuries of the hand who were seen over a 5-year period at our Trauma Department, were investigated. Females accounted for 66 % of all injuries. The mean age was 26

  3. Hand measuring eqipment

    DEFF Research Database (Denmark)

    De Chiffre, Leonardo

    This note is used in connection with a 3 x 2 hours laboratory exercise as a part of the course GEOMETRICAL METROLOGY AND MACHINE TESTING. The laboratory includes a demonstration of a series of hand measuring tools as well as a number of exercises, illustrating the use of hand measuring equipment...

  4. HAND INJURIES IN VOLLEYBALL

    NARCIS (Netherlands)

    BHAIRO, NH; NIJSTEN, MWN; VANDALEN, KC; TENDUIS, HJ

    1992-01-01

    We studied the long-term sequelae of hand injuries as a result of playing volleyball. In a retrospective study, 226 patients with injuries of the hand who were seen over a 5-year period at our Trauma Department, were investigated. Females accounted for 66 % of all injuries. The mean age was 26 years

  5. Hand Specific Representations in Language Comprehension

    Directory of Open Access Journals (Sweden)

    Claire eMoody-Triantis

    2014-06-01

    Full Text Available Theories of embodied cognition argue that language comprehension involves sensory-motor re-enactments of the actions described. However, the degree of specificity of these re-enactments as well as the relationship between action and language remains a matter of debate. Here we investigate these issues by examining how hand-specific information (left or right hand is recruited in language comprehension and action execution. An fMRI study tested right-handed participants in two separate tasks that were designed to be as similar as possible to increase sensitivity of the comparison across task: an action execution go/no-go task where participants performed right or left hand actions, and a language task where participants read sentences describing the same left or right handed actions as in the execution task. We found that language-induced activity did not match the hand-specific patterns of activity found for action execution in primary somatosensory and motor cortex, but it overlapped with pre-motor and parietal regions associated with action planning. Within these pre-motor regions, both right hand actions and sentences elicited stronger activity than left hand actions and sentences - a dominant hand effect -. Importantly, both dorsal and ventral sections of the left pre-central gyrus were recruited by both tasks, suggesting different action features being recruited. These results suggest that (a language comprehension elicits motor representations that are hand-specific and akin to multimodal action plans, rather than full action re-enactments; and (b language comprehension and action execution share schematic hand-specific representations that are richer for the dominant hand, and thus linked to previous motor experience.

  6. Hand Hygiene: When and How

    Science.gov (United States)

    ... handrub? How to handwash? RUB HANDS FOR HAND HYGIENE! WASH HANDS WHEN VISIBLY SOILED Duration of the entire procedure: ... from its use. When? YOUR 5 MOMENTS FOR HAND HYGIENE 1 BEFORETOUCHINGA PATIENT 2 B P ECFLOER R ...

  7. Veining Failure and Hydraulic Fracturing in Shales

    Science.gov (United States)

    Mighani, S.; Sondergeld, C. H.; Rai, C. S.

    2014-12-01

    During the hydraulic fracturing, the pressurized fluid creates new fractures and reactivates existing natural fractures forming a highly conductive Stimulated Reservoir Volume (SRV) around the borehole. We extend the previous work on Lyons sandstone and pyrophyllite to anisotropic shale from the Wolfcamp formation. We divide the rock anisotropy into two groups: a) conventional and b) unconventional (shaly) anisotropy. X-ray Computed Tomography (CT), compressional velocity anisotropy, and SEM analysis are used to identify three causes of anisotropy: bedding planes, clay lamination, and calcite veins. Calcite vein is a subsequently filled with calcite bonded weakly to the matrix. Velocity anisotropy and visual observations demonstrate the calcite filled veins to be mostly subparallel to the fabric direction. Brazilian tests are carried out to observe the fracture initiation and propagation under tension. High speed photography (frame rate 300,000 frame/sec) was used to capture the failure. Strain gauges and Acoustic Emission (AE) sensors recorded the deformation leading up to and during failure. SEM imaging and surface profilometry were employed to study the post-failure fracture system and failed surface topology. Fracture permeability was measured as a function of effective stress. Brazilian tests on small disks containing a centered single vein revealed the shear strength of the veins. We interpret the strain data and number, frequency, and amplitude of AE events which are correlated well with the observed fracture process zone, surface roughness, and permeability. The unpropped fracture has enhanced permeability by two orders of magnitude. The observed anisotropic tensile failure seems to have a universal trend with a minimum strength occurring at 15o orientation with respect to the loading axis. The veins at 15o orientation with respect to the loading axis were easily activated at 30% of the original failure load. The measured strength of the vein is as low as 6

  8. Optimization of subcutaneous vein contrast enhancement

    Science.gov (United States)

    Zeman, Herbert D.; Lovhoiden, Gunnar; Deshmukh, Harshal

    2000-05-01

    A technique for enhancing the contrast of subcutaneous veins has been demonstrated. This techniques uses a near IR light source and one or more IR sensitive CCD TV cameras to produce a contrast enhanced image of the subcutaneous veins. This video image of the veins is projected back onto the patient's skin using a n LCD video projector. The use of an IR transmitting filter in front of the video cameras prevents any positive feedback from the visible light from the video projector from causing instabilities in the projected image. The demonstration contrast enhancing illuminator has been tested on adults and children, both Caucasian and African-American, and it enhances veins quite well in all cases. The most difficult cases are those where significant deposits of subcutaneous fat are present which make the veins invisible under normal room illumination. Recent attempts to see through fat using different IR wavelength bands and both linearly and circularly polarized light were unsuccessful. The key to seeing through fat turns out to be a very diffuse source of RI light. Results on adult and pediatric subjects are shown with this new IR light source.

  9. Ligation of superior mesenteric vein and portal to splenic vein anastomosis after superior mesenteric-portal vein confluence resection during pancreaticoduodenectomy – Case report

    Science.gov (United States)

    Tang, Jianlin; Abbas, Jihad; Hoetzl, Katherine; Allison, David; Osman, Mahamed; Williams, Mallory; Zelenock, Gerald B.

    2014-01-01

    62 year old Caucasian female with pancreatic head mass abutting the superior mesenteric vein (SMV) presented with fine needle aspiration biopsy confirmed diagnosis of ductal adenocarcinoma. CT scan showed near complete obstruction of portal vein and large SMV collateral development. After 3 months of neoadjuvant therapy, her portal vein flow improved significantly, SMV collateral circulation was diminished. Pancreaticoduodenectomy (PD) and superior mesenteric portal vein (SMPV) confluence resection were performed; A saphenous vein interposition graft thrombosed immediately. The splenic vein remnant was distended and adjacent to the stump of the portal vein. Harvesting an internal jugular vein graft required extra time and using a synthetic graft posed a risk of graft thrombosis or infection. As a result, we chose to perform a direct anastomosis of the portal and splenic vein in a desperate situation. The anastomosis decompressed the mesenteric venous system, so we then ligated the SMV. The patient had an uneventful postoperative course, except transient ascites. She redeveloped ascites more than one year later. At that time a PET scan showed bilateral lung and right femur metastatic disease. She expired 15 months after PD. Conclusion The lessons we learned are (1) Before SMPV confluence resection, internal jugular vein graft should be ready for reconstruction. (2) Synthetic graft is an alternative for internal jugular vein graft. (3) Direct portal vein to SMV anastomosis can be achieved by mobilizing liver. (4) It is possible that venous collaterals secondary to SMV tumor obstruction may have allowed this patient's post-operative survival. PMID:25568802

  10. Finger-vein image enhancement using a fuzzy-based fusion method with Gabor and Retinex filtering.

    Science.gov (United States)

    Shin, Kwang Yong; Park, Young Ho; Nguyen, Dat Tien; Park, Kang Ryoung

    2014-02-17

    Because of the advantages of finger-vein recognition systems such as live detection and usage as bio-cryptography systems, they can be used to authenticate individual people. However, images of finger-vein patterns are typically unclear because of light scattering by the skin, optical blurring, and motion blurring, which can degrade the performance of finger-vein recognition systems. In response to these issues, a new enhancement method for finger-vein images is proposed. Our method is novel compared with previous approaches in four respects. First, the local and global features of the vein lines of an input image are amplified using Gabor filters in four directions and Retinex filtering, respectively. Second, the means and standard deviations in the local windows of the images produced after Gabor and Retinex filtering are used as inputs for the fuzzy rule and fuzzy membership function, respectively. Third, the optimal weights required to combine the two Gabor and Retinex filtered images are determined using a defuzzification method. Fourth, the use of a fuzzy-based method means that image enhancement does not require additional training data to determine the optimal weights. Experimental results using two finger-vein databases showed that the proposed method enhanced the accuracy of finger-vein recognition compared with previous methods.

  11. Finger-Vein Image Enhancement Using a Fuzzy-Based Fusion Method with Gabor and Retinex Filtering

    Directory of Open Access Journals (Sweden)

    Kwang Yong Shin

    2014-02-01

    Full Text Available Because of the advantages of finger-vein recognition systems such as live detection and usage as bio-cryptography systems, they can be used to authenticate individual people. However, images of finger-vein patterns are typically unclear because of light scattering by the skin, optical blurring, and motion blurring, which can degrade the performance of finger-vein recognition systems. In response to these issues, a new enhancement method for finger-vein images is proposed. Our method is novel compared with previous approaches in four respects. First, the local and global features of the vein lines of an input image are amplified using Gabor filters in four directions and Retinex filtering, respectively. Second, the means and standard deviations in the local windows of the images produced after Gabor and Retinex filtering are used as inputs for the fuzzy rule and fuzzy membership function, respectively. Third, the optimal weights required to combine the two Gabor and Retinex filtered images are determined using a defuzzification method. Fourth, the use of a fuzzy-based method means that image enhancement does not require additional training data to determine the optimal weights. Experimental results using two finger-vein databases showed that the proposed method enhanced the accuracy of finger-vein recognition compared with previous methods.

  12. Geometric and Fractal Characteristics of Veins in San Joaquin, Queretaro, Mexico

    Science.gov (United States)

    Yussim, S.; Flores-Estrella, H. C.

    2004-12-01

    This work was made in the most eastern part of the Fold and Fault Mexican Belt of the Sierra Madre Oriental, where a sea Mesozoic sequence is exposed and formed by three lithostratigraphic units with different mechanical characteristics: the upper and lower mechanically incompetents, and the middle one mechanically competent. From the geometrical point of view, four vein systems were identified: the oldest one parallel to the stratification; two other more recent and contemporaneous with general orientations N75°E, 70°SE and N25°E, 70°SE, which are symmetrical to the youngest one with orientation N50°E, 80°SE. All the system orientations are compatibles with the tectonic transport of the area. In the other hand, Fractal Geometry application allows describing vein characteristics that conventional techniques does not: as the filled space measurement and the power laws that rule veins. The fractal analysis consisted on various stages: the first one was made with developed software, which estimates the fractal dimension of an image basing on box-counting method. All the vein systems images were studied by site, and it was found that the fractal dimension varied from 1.2 to 1.8, and the largest values were associated with the most competent lithology and not with the most competent unit. With the analysis for each vein system the fractal dimension varied from 1.1 to 1.82, and it was concluded that the values tend to decrease as the systems are younger, and the intermediate systems have the larger variation because they were affected by the latest vein system.

  13. Development of hand phenotypes and changes in hand pain and problems over time in older people.

    Science.gov (United States)

    Green, Daniel J; Jordan, Kelvin P; Protheroe, Joanne; van der Windt, Danielle A

    2016-03-01

    Hand disabilities are frequent causes of pain and disability in older people, yet knowledge regarding the characteristics and patterns of hand pain and problems over time is lacking. The main aim of this study was to identify subgroups of older individuals with distinct presentations (phenotypes) of hand pain and function, investigate how these might change over a 6-year period, and explore what characteristics and factors are associated with long-term status. The study population stemmed from the North Staffordshire Osteoarthritis Project, a large, general population-based, prospective, cohort study of adults aged 50 years and older. Information on hand pain and problems was collected using questionnaires at baseline, 3 years, and 6 years. Overall, 5617 participants responded at all time points and were included in the analysis. Five phenotypes were identified using latent transition analysis ("least affected," "high pain," "poor gross function," "high pain and poor gross function," and "severely affected") based on 8 hand pain and functional items. The most common transition between phenotypes was from "high pain" at baseline to "least-affected" group. There was a high level of stability in individuals in the "least-affected" or "severely affected" group at baseline. Individuals with widespread body pain, nodes, sleep problems, and pain in both hands at baseline were more likely to be in a severe hand phenotype at 6 years. The results provide clinically relevant information regarding the pattern of hand pain and problems over time and factors that predict transition to more severe hand phenotypes.

  14. Velocity time integral for right upper pulmonary vein in VLBW infants with patent ductus arteriosus.

    Science.gov (United States)

    Lista, Gianluca; Bianchi, Silvia; Mannarino, Savina; Schena, Federico; Castoldi, Francesca; Stronati, Mauro; Mosca, Fabio

    2016-10-01

    Early diagnosis of significant patent ductus arteriosus reduces the risk of clinical worsening in very low birth weight infants. Echocardiographic patent ductus arteriosus shunt flow pattern can be used to predict significant patent ductus arteriosus. Pulmonary venous flow, expressed as vein velocity time integral, is correlated to ductus arteriosus closure. The aim of this study is to investigate the relationship between significant reductions in vein velocity time integral and non-significant patent ductus arteriosus in the first week of life. A multicenter, prospective, observational study was conducted to evaluate very low birth weight infants (patent ductus compared to those with closed patent ductus arteriosus and the difference was significant. A significant reduction in vein velocity time integral in the first days of life is associated with ductus closure. This parameter correlates well with other echocardiographic parameters and may aid in the diagnosis and management of patent ductus arteriosus.

  15. MRI manifestations of enlarged superior ophthalmic vein

    Institute of Scientific and Technical Information of China (English)

    WEI Rui-li; MA Xiao-ye; CAI Ji-ping; ZHU Huang

    2002-01-01

    Objective:To assess MRI in the evaluation of enlarged superior ophthalmic vein (SOV). Methods: MRI manifestations and etiology of forty-six patients with enlarged SOV were analyzed. Results: SOV enlargement was noted to occur in carotid-cavernous fistula, ophthalmic Graves'disease, Tolosa-Hunt syndrome, inflammation at the apex of the orbit, orbital pseudotumor and thrombosis of cavernous sinus. The dilated vein appeared as signal void tubular shadows on both T1 and T2 weighted images. The diameter of the enlarged vein was 3.5-6.0 mm. Extraocular muscle enlargement, orbital pathologies, enlarged carotid cavernous sinus etc were also revealed by MRI. Conclusion: The dilated SOV may be well demonstrated by MRI. The etiological diagnosis of enlarged SOV can be made in combination with the associated findings.

  16. Pathogenesis of varicose veins - lessons from biomechanics.

    Science.gov (United States)

    Pfisterer, Larissa; König, Gerd; Hecker, Markus; Korff, Thomas

    2014-03-01

    The development of varicose veins or chronic venous insufficiency is preceded by and associated with the pathophysiological remodelling of the venous wall. Recent work suggests that an increase in venous filling pressure is sufficient to promote varicose remodelling of veins by augmenting wall stress and activating venous endothelial and smooth muscle cells. In line with this, known risk factors such as prolonged standing or an obesity-induced increase in venous filling pressure may contribute to varicosis. This review focuses on biomechanically mediated mechanisms such as an increase in wall stress caused by venous hypertension or alterations in blood flow, which may be involved in the onset of varicose vein development. Finally, possible therapeutic options to counteract or delay the progress of this venous disease are discussed.

  17. Rule-based model of vein graft remodeling.

    Directory of Open Access Journals (Sweden)

    Minki Hwang

    Full Text Available When vein segments are implanted into the arterial system for use in arterial bypass grafting, adaptation to the higher pressure and flow of the arterial system is accomplished thorough wall thickening and expansion. These early remodeling events have been found to be closely coupled to the local hemodynamic forces, such as shear stress and wall tension, and are believed to be the foundation for later vein graft failure. To further our mechanistic understanding of the cellular and extracellular interactions that lead to global changes in tissue architecture, a rule-based modeling method is developed through the application of basic rules of behaviors for these molecular and cellular activities. In the current method, smooth muscle cell (SMC, extracellular matrix (ECM, and monocytes are selected as the three components that occupy the elements of a grid system that comprise the developing vein graft intima. The probabilities of the cellular behaviors are developed based on data extracted from in vivo experiments. At each time step, the various probabilities are computed and applied to the SMC and ECM elements to determine their next physical state and behavior. One- and two-dimensional models are developed to test and validate the computational approach. The importance of monocyte infiltration, and the associated effect in augmenting extracellular matrix deposition, was evaluated and found to be an important component in model development. Final model validation is performed using an independent set of experiments, where model predictions of intimal growth are evaluated against experimental data obtained from the complex geometry and shear stress patterns offered by a mid-graft focal stenosis, where simulation results show good agreements with the experimental data.

  18. Vein versus tragal perichondrium in stapedotomy.

    Science.gov (United States)

    Schmerber, Sébastien; Cuisnier, Olivier; Charachon, Robert; Lavieille, Jean-Pierre

    2004-09-01

    To assess, in otosclerosis surgery, whether the vein or the tragal perichondrium in stapedotomy with interposition yields the better long-term hearing outcome. A retrospective chart review of prospectively collected audiometric data of 452 ears. Academic tertiary otology-neurotology referral center. Four hundred fifty-two stapedotomies with interposition were performed in 412 patients (bilateral in 40 patients) by the senior author (R.C.) between 1987 and 1998. A tragal perichondrium graft was used in 314 cases and a vein graft was used in 138 cases as sealing material of the oval window. Audiometric data were recorded at 4 months, at 1 year, and at 3 years after surgery after American Academy of Otolaryngology-Head and Neck Surgery guidelines, except for thresholds at 3 kHz, which were not available and which were replaced with those at 4 kHz. There were no significant intergroup differences in initial or late postoperative hearing outcome with regard to change in the pure-tone average bone conduction and air-bone gaps, or sensorineural hearing loss. Ears treated with a vein graft showed statistically better postoperative 2-kHz air-bone gap closure (p =0.0157), but the pure-tone average air-bone gap difference was not significant. Postoperative air-bone gap closure to within 10 dB was achieved in 91% of cases in the vein group and in 76% of cases in the perichondrium group. Specific study of the bone conduction level at 4 kHz showed a sensorineural hearing loss greater than 10 dB in 8% of cases in the vein group and in 11% of cases in the perichondrium group. One case of complete sensorineural hearing loss was observed with a tragal perichondrium graft (0.22%). These results suggest that the vein should be preferred to the tragal perichondrium in stapedotomy with interposition.

  19. Fibrous gypsum veins as diffuse features and within fault zones: the case study of the Pisco Basin (Ica desert, southern Peru)

    Science.gov (United States)

    Rustichelli, Andrea; Di Celma, Claudio; Tondi, Emanuele; Baud, Patrick; Vinciguerra, Sergio

    2016-04-01

    New knowledge on patterns of fibrous gypsum veins, their genetic mechanisms, deformation style and weathering are provided by a field- and laboratory-based study carried out on the Neogene to Quaternary Pisco Basin sedimentary strata (porous sandstones, siltstones and diatomites) exposed in the Ica desert, southern Peru. Gypsum veins vary considerably in dimensions, attitudes and timing and can develop in layered and moderately fractured rocks also in the absence of evaporitic layers. Veins occur both as diffuse features, confined to certain stratigraphic levels, and localised within fault zones. Arrays formed by layer-bounded, mutually orthogonal sets of steeply-dipping gypsum veins are reported for the first time. Vein length, height and spacing depend on the thickness of the bed packages in which they are confined. Within fault zones, veins are partly a product of faulting but also inherited layer-bounded features along which faults are superimposed. Due to the different petrophysical properties with respect to the parent rocks and their susceptibility to textural and mineralogical modifications, water dissolution and rupture, gypsum veins may have a significant role in geofluid management. Depending on their patterns and grade of physical and chemical alteration, veins may influence geofluid circulation and storage, acting as barriers to flow and possibly also as conduits.

  20. Duplicated Ižnternal Juguler Vein

    Directory of Open Access Journals (Sweden)

    Ahmet Kirbas

    2014-03-01

    Full Text Available    Duplicated internal juguler vein (DIJV is a rare anomaly and reported incidence is 0.4 % in the literature. A 45-year-old female patient was referred to our hospital because of non pulsatile neck swelling. The magnetic resonance image (MRI showed left IJVs divided at the angles of the mandible running anterior to the common carotid artery until anterior mediastinal level. Clinicians should be aware of the rare possibility of duplicated IJVs in patients presenting with neck swelling. The development of imaging technics have revealed more cases of duplicated internal juguler vein.

  1. Deep vein thrombosis: a clinical review

    Directory of Open Access Journals (Sweden)

    Kesieme EB

    2011-04-01

    Full Text Available Emeka Kesieme1, Chinenye Kesieme2, Nze Jebbin3, Eshiobo Irekpita1, Andrew Dongo11Department of Surgery, Irrua Specialist Teaching Hospital, Irrua, Nigeria; 2Department of Paediatrics, Irrua Specialist Teaching Hospital, Irrua, Nigeria; 3Department of Surgery, University of Port Harcourt Teaching Hospital, Port-Harcourt, NigeriaBackground: Deep vein thrombosis (DVT is the formation of blood clots (thrombi in the deep veins. It commonly affects the deep leg veins (such as the calf veins, femoral vein, or popliteal vein or the deep veins of the pelvis. It is a potentially dangerous condition that can lead to preventable morbidity and mortality.Aim: To present an update on the causes and management of DVT.Methods: A review of publications obtained from Medline search, medical libraries, and Google.Results: DVT affects 0.1% of persons per year. It is predominantly a disease of the elderly and has a slight male preponderance. The approach to making a diagnosis currently involves an algorithm combining pretest probability, D-dimer testing, and compression ultrasonography. This will guide further investigations if necessary. Prophylaxis is both mechanical and pharmacological. The goals of treatment are to prevent extension of thrombi, pulmonary embolism, recurrence of thrombi, and the development of complications such as pulmonary hypertension and post-thrombotic syndrome.Conclusion: DVT is a potentially dangerous condition with a myriad of risk factors. Prophylaxis is very important and can be mechanical and pharmacological. The mainstay of treatment is anticoagulant therapy. Low-molecular-weight heparin, unfractionated heparin, and vitamin K antagonists have been the treatment of choice. Currently anticoagulants specifically targeting components of the common pathway have been recommended for prophylaxis. These include fondaparinux, a selective indirect factor Xa inhibitor and the new oral selective direct thrombin inhibitors (dabigatran and selective

  2. Renal actinomycosis with concomitant renal vein thrombosis.

    Science.gov (United States)

    Chang, Dong-Suk; Jang, Won Ik; Jung, Ji Yoon; Chung, Sarah; Choi, Dae Eun; Na, Ki-Ryang; Lee, Kang Wook; Shin, Yong-Tai

    2012-02-01

    Renal actinomycosis is a rare infection caused by fungi of the genus Actinomyces. A 74-year-old male was admitted to our hospital because of gross hematuria with urinary symptoms and intermittent chills. Computed tomography of the abdomen showed thrombosis in the left renal vein and diffuse, heterogeneous enlargement of the left kidney. After nephrectomy, sulfur granules with chronic suppurative inflammation were seen microscopically, and the histopathological diagnosis was renal actinomycosis. Our case is the first report of renal actinomycosis with renal vein thrombosis.

  3. Portal vein thrombosis in patients with cirrhosis

    DEFF Research Database (Denmark)

    von Köckritz, Leona; De Gottardi, Andrea; Trebicka, Jonel

    2017-01-01

    Portal vein thrombosis (PVT) is frequent in patients with liver cirrhosis and possible severe complications such as mesenteric ischemia are rare, but can be life-threatening. However, different aspects of clinical relevance, diagnosis and management of PVT are still areas of uncertainty and inves......Portal vein thrombosis (PVT) is frequent in patients with liver cirrhosis and possible severe complications such as mesenteric ischemia are rare, but can be life-threatening. However, different aspects of clinical relevance, diagnosis and management of PVT are still areas of uncertainty...

  4. Postpartum Ovarian Vein Thrombophlebitis with Staphylococcal Bacteremia

    Science.gov (United States)

    Parino, Eduardo; Mulinaris, Eric; Saccomano, Edgardo; Gallo, Juan Cruz; Kohan, Gabriel

    2015-01-01

    A 34-year-old female patient presented with fever and right flank pain ten days after uncomplicated vaginal delivery. CT examination revealed right ovarian vein thrombosis and methicillin-resistant Staphylococcus aureus (MRSA) was isolated from blood cultures. No other source of bacteremia was found. Antibiotic therapy and anticoagulation with enoxaparin were instituted. Fourteen days after admission, she was discharged in good condition. Although a very uncommon complication after spontaneous vaginal delivery, septic ovarian vein thrombophlebitis should be suspected in cases of persistent puerperal fever when other diagnostic possibilities have been excluded. PMID:26221549

  5. Dexamethasone Implant (Ozurdex in a Case with Unilateral Simultaneous Central Retinal Vein and Branch Retinal Artery Occlusion

    Directory of Open Access Journals (Sweden)

    Taylan Ozturk

    2015-02-01

    Full Text Available Simultaneous branch retinal artery and vein occlusion is a rare condition that may cause severe visual loss, and its treatment is often unrewarding. Herein, we report a case with simultaneous central retinal vein and branch retinal artery occlusion; it was successfully treated with a single dexamethasone intravitreal implant. The affected eye attained a visual acuity level of 20/25 from the visual acuity of hand motions at presentation with a residual, but relatively diminished, altitudinal scotoma during a follow-up period of 6 months.

  6. About Hand Surgery

    Science.gov (United States)

    ... us eat, dress, write, earn a living, create art and do many other activities. To accomplish these ... 2009 American Society for Surgery of the Hand. Definition developed by ASSH Council. Other Links CME Mission ...

  7. Osteoarthritis of the Hand

    Science.gov (United States)

    ... Therapist? Media Find a Hand Surgeon Home Anatomy Osteoarthritis Email to a friend * required fields From * To * ... for those with osteoarthritis. TREATMENT The Diagnosis of Osteoarthritis When diagnosing osteoarthritis, your doctor will ask you ...

  8. Stiffness in the Hand

    Science.gov (United States)

    ... include: Arthritis Fractures Dislocations Bad sprains Tendon and muscle injuries Evaluating Hand Stiffness Your doctor will ask when the stiffness ... scan. CAUSES SIGNS AND ... stretching exercises for the joints and muscles to help loosen them. Different types of splints ...

  9. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... captioning. Videos are prepared for different audiences including, children, parents, and public health professionals. More > Hand Hygiene ... captioning. Videos are prepared for different audiences including, children, parents, and public health professionals. More > File Formats ...

  10. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... get more than a million infections in the hospital while being treated for something else. The best ... reminding healthcare providers to practice hand hygiene in hospitals and other healthcare facilities. Release Date: 8/4/ ...

  11. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... To Health (4:17) Vital Signs High Blood Pressure Spanish Diseases & Conditions Hablemos de la Influenza Influenza ... Videos are prepared for different audiences including, children, parents, and public health professionals. More > Hand Hygiene Saves ...

  12. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... Lives shows how patients can play an active role in reminding healthcare providers to practice hand hygiene ... Director for Communication, Division of News and Electronic Media Email Recommend Tweet YouTube Instagram Listen Watch RSS ...

  13. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... Please Parents Want To Do What′s Best The Obesity Epidemic Outbreaks CDC: Protecting Americans through Global Health ... captioning. Videos are prepared for different audiences including, children, parents, and public health professionals. More > Hand Hygiene ...

  14. Hand lotion poisoning

    Science.gov (United States)

    ... lotion or cream can be harmful if swallowed: Dimethicone Mineral oil Paraffins (waxes) Petrolatum Various alcohols Where ... Hand cream poisoning References Caraccio TR, McFee RB. Cosmetics and toilet articles. In: Shannon MW, Borron SW, ...

  15. Second Hand Smoke: Danger

    Science.gov (United States)

    ... What's this? Submit Button Past Emails Second Hand Smoke: Danger! Recommend on Facebook Tweet Share Compartir Make ... the United States are still exposed to secondhand smoke, even though cigarette smoking rates are dropping and ...

  16. Mind the hand

    DEFF Research Database (Denmark)

    Davidsen, Jacob; Christiansen, Ellen Tove

    2014-01-01

    , to construct and problem solve, and to show and imitate. The analyses show how a space emerges from the interaction between the children and the touchscreen, and how their hand movements reveal intelligence-as-action. Three situations with three different pairs were analysed to explore how children use......Apart from touching the screen, what is the role of the hands for children collaborating around touchscreens? Based on embodied and multimodal interaction analysis of 8- and 9-year old pairs collaborating around touchscreens, we conclude that children use their hands to constrain and control access...... their hands in activities around touchscreens, focusing in particular on how they collaborate. The analysis presented here is part of a research study on the use of touchscreens in children’s embodied and multimodal collaborative learning activities in their everyday classrooms. The general aim of the study...

  17. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... Thinking The Value of Systems Thinking (10:09) Systems Mapping: The Basics ... how patients can play an active role in reminding healthcare providers to practice hand hygiene in hospitals and ...

  18. The variations of Sylvian veins and cisterns in anterior circulation aneurysms. An operative study.

    Science.gov (United States)

    Aydin, I H; Kadioğlu, H H; Tüzün, Y; Kayaoğlu, C R; Takçi, E

    1996-01-01

    The anatomical variations of Sylvian vein and cistern were investigated during the pterional approach in 230 patients with 276 aneurysms of anterior circulation arteries, that were operated on at the Neurosurgical Department of Atatürk University Medical School. Erzurum, Türkiye. All patients underwent radical surgery for aneurysm by the right or left pterional approach. The findings were recorded during surgical intervention and observed through the slides and videotapes of the operations. In our study, we surgically classified the variations of the Sylvian vein, according to its branching and draining patterns. Type I: The fronto-orbital (frontosylvian), fronto-parietal (parietosylvian) and anterior temporal (temporosylvian) veins drain into one sylvian vein. Type II: Two superficial Sylvian veins with separated basal vein draining into the sphenoparietal and Rosenthal's basal vein. Type III: Two superficial Sylvian veins draining into the sphenoparietal and the superior petrosal veins. Type IV: Hypoplastic superficial Sylvian vein and the deep one. Four types of Sylvian vein variations were defined as follows. The Type I was seen in 45% (n = 103), the Type II was found in 29% (n = 67), Type III was recorded in 15% (n = 34) and Type IV, or hypoplastic and deep form was discovered in 11% (n = 26) of patients. The course of the Sylvian vein was on the temporal side (Temporal Coursing) in 70 percent of the cases (n = 160), on the frontal side (Frontal Coursing) in 19% of the patients (n = 45) and in 8 percent of the cases (n = 18) in the deep localization (Deep Coursing). Only 3 percent of the cases (n = 7) showed a mixed course. The variations of the Sylvian cisterns were classified into three types, according to the relationships between the lateral fronto-orbital gyrus and the superior temporal gyrus. In Sylvian Type, the frontal and temporal lobes are loosely (Sylvian Type A, Large) or tightly (Sylvian Type B, Close and Narrow) approximated on the surface

  19. The Use Of The VEINES-QOL/Sym Questionnaire In Patients Operated For Varicose Veins

    Directory of Open Access Journals (Sweden)

    Migdalski Łukasz

    2015-10-01

    Full Text Available Venous insufficiency is a common, chronic disease that affects nearly half of the population in highly developed countries. The vast majority of affected patients suffer from varicose veins (VV. Recently, the priority in medicine has been patient satisfaction with treatment and high quality of life. Therefore, disease-specific questionnaires that measure quality of life have been developed. One of these is VEINES-QOL/Sym with two subscales that assess quality of life and disease symptoms. To date, it has been used to examine patients with venous ulcers and thrombosis. No data are available concerning the use of VEINES to assess patients after VV surgery.

  20. An unusual case: right proximal ureteral compression by the ovarian vein and distal ureteral compression by the external iliac vein

    Directory of Open Access Journals (Sweden)

    Halil Ibrahim Serin

    2015-12-01

    Full Text Available A 32-years old woman presented to the emergency room of Bozok University Research Hospital with right renal colic. Multidetector computed tomography (MDCT showed compression of the proximal ureter by the right ovarian vein and compression of the right distal ureter by the right external iliac vein. To the best of our knowledge, right proximal ureteral compression by the ovarian vein together with distal ureteral compression by the external iliac vein have not been reported in the literature. Ovarian vein and external iliac vein compression should be considered in patients presenting to the emergency room with renal colic or low back pain and a dilated collecting system.

  1. Enhancement display of veins distribution based on binocular vision and image fusion technology

    Science.gov (United States)

    Liu, Peng; Di, Si; Jin, Jian; Bai, Liping

    2014-11-01

    The capture and display of veins distribution is an important issue for some applications, such as medical diagnosis and identification. Therefore, it has become a popular topic in the field of biomedical imaging. Usually, people capture the veins distribution by infrared imaging, but the display result is similar with that of a gray picture and the color and details of skin cannot be remained. To some degree, it is unreal for doctors. In this paper, we develop a binocular vision system to carry out the enhancement display of veins under the condition of keeping actual skin color. The binocular system is consisted of two adjacent cameras. A visible band filter and an infrared band filter are placed in front of the two lenses, respectively. Therefore, the pictures of visible band and infrared band can be captured simultaneously. After that, a new fusion process is applied to the two pictures, which related to histogram mapping, principal component analysis (PCA) and modified bilateral filter fusion. The final results show that both the veins distribution and the actual skin color of the back of the hand can be clearly displayed. Besides, correlation coefficient, average gradient and average distortion are selected as the parameters to evaluate the image quality. By comparing the parameters, it is evident that our novel fusion method is prior to some popular fusion methods such as Gauss filter fusion, Intensity-hue-saturation (HIS) fusion and bilateral filter fusion.

  2. Endovascular Radiofrequency Ablation for Varicose Veins

    Science.gov (United States)

    2011-01-01

    Executive Summary Objective The objective of the MAS evidence review was to conduct a systematic review of the available evidence on the safety, effectiveness, durability and cost–effectiveness of endovascular radiofrequency ablation (RFA) for the treatment of primary symptomatic varicose veins. Background The Ontario Health Technology Advisory Committee (OHTAC) met on August 26th, 2010 to review the safety, effectiveness, durability, and cost-effectiveness of RFA for the treatment of primary symptomatic varicose veins based on an evidence-based review by the Medical Advisory Secretariat (MAS). Clinical Condition Varicose veins (VV) are tortuous, twisted, or elongated veins. This can be due to existing (inherited) valve dysfunction or decreased vein elasticity (primary venous reflux) or valve damage from prior thrombotic events (secondary venous reflux). The end result is pooling of blood in the veins, increased venous pressure and subsequent vein enlargement. As a result of high venous pressure, branch vessels balloon out leading to varicosities (varicose veins). Symptoms typically affect the lower extremities and include (but are not limited to): aching, swelling, throbbing, night cramps, restless legs, leg fatigue, itching and burning. Left untreated, venous reflux tends to be progressive, often leading to chronic venous insufficiency (CVI). A number of complications are associated with untreated venous reflux: including superficial thrombophlebitis as well as variceal rupture and haemorrhage. CVI often results in chronic skin changes referred to as stasis dermatitis. Stasis dermatitis is comprised of a spectrum of cutaneous abnormalities including edema, hyperpigmentation, eczema, lipodermatosclerosis and stasis ulceration. Ulceration represents the disease end point for severe CVI. CVI is associated with a reduced quality of life particularly in relation to pain, physical function and mobility. In severe cases, VV with ulcers, QOL has been rated to be as bad

  3. Varicose Veins: Role of Mechanotransduction of Venous Hypertension

    Science.gov (United States)

    Atta, Hussein M.

    2012-01-01

    Varicose veins affect approximately one-third of the adult population and result in significant psychological, physical, and financial burden. Nevertheless, the molecular pathogenesis of varicose vein formation remains unidentified. Venous hypertension exerted on veins of the lower extremity is considered the principal factor in varicose vein formation. The role of mechanotransduction of the high venous pressure in the pathogenesis of varicose vein formation has not been adequately investigated despite a good progress in understanding the mechanomolecular mechanisms involved in transduction of high blood pressure in the arterial wall. Understanding the nature of the mechanical forces, the mechanosensors and mechanotransducers in the vein wall, and the downstream signaling pathways will provide new molecular targets for the prevention and treatment of varicose veins. This paper summarized the current understanding of mechano-molecular pathways involved in transduction of hemodynamic forces induced by blood pressure and tries to relate this information to setting of venous hypertension in varicose veins. PMID:22489273

  4. Varicose Veins: Role of Mechanotransduction of Venous Hypertension

    Directory of Open Access Journals (Sweden)

    Hussein M. Atta

    2012-01-01

    Full Text Available Varicose veins affect approximately one-third of the adult population and result in significant psychological, physical, and financial burden. Nevertheless, the molecular pathogenesis of varicose vein formation remains unidentified. Venous hypertension exerted on veins of the lower extremity is considered the principal factor in varicose vein formation. The role of mechanotransduction of the high venous pressure in the pathogenesis of varicose vein formation has not been adequately investigated despite a good progress in understanding the mechanomolecular mechanisms involved in transduction of high blood pressure in the arterial wall. Understanding the nature of the mechanical forces, the mechanosensors and mechanotransducers in the vein wall, and the downstream signaling pathways will provide new molecular targets for the prevention and treatment of varicose veins. This paper summarized the current understanding of mechano-molecular pathways involved in transduction of hemodynamic forces induced by blood pressure and tries to relate this information to setting of venous hypertension in varicose veins.

  5. Brain vein disorders in newborn infants

    NARCIS (Netherlands)

    Raets, Marlou; Dudink, Jeroen; Raybaud, Charles; Ramenghi, Luca; Lequin, Maarten; Govaert, Paul

    2015-01-01

    The brain veins of infants are in a complex phase of remodelling in the perinatal period. Magnetic resonance venography and susceptibility-weighted imaging, together with high-resolution Doppler ultrasound, have provided new tools to aid study of venous developmental anatomy and disease. This review

  6. Endovascular vein harvest: systemic carbon dioxide absorption.

    Science.gov (United States)

    Maslow, Andrew M; Schwartz, Carl S; Bert, Arthur; Hurlburt, Peter; Gough, Jeffrey; Stearns, Gary; Singh, Arun K

    2006-06-01

    Endovascular vein harvest (EDVH) requires CO(2) insufflation to expand the subcutaneous space, allowing visualization and dissection of the saphenous vein. The purpose of this study was to assess the extent of CO(2) absorption during EDVH. Prospective observational study. Single tertiary care hospital. Sixty patients (30 EDVH and 30 open-vein harvest) undergoing isolated coronary artery bypass graft surgery. Hemodynamic, procedural, and laboratory data were collected prior to (baseline), during, and at it the conclusion (final) of vein harvesting. Data were also collected during cardiopulmonary bypass (CPB). Data were compared by using t tests, analysis of variance, and correlation statistics when needed. There were significant increases in arterial CO(2) (PaCO(2), 35%) and decreases in pH (1.35%) during EDVH. These were associated with increases in heart rate, mean blood pressure, and cardiac output. Within the EDVH group, greater elevations (>10 mmHg) in PaCO2 were more likely during difficult harvest procedures, and these patients exhibited greater increase in heart rate. Elevated CO(2) persisted during CPB, requiring higher systemic gas flows and greater use of phenylephrine to maintain desired hemodynamics. EDVH was associated with systemic absorption of CO(2). Greater absorption was more likely in difficult procedures and was associated with greater hemodynamic changes requiring medical therapy.

  7. Puzzles in practice: splenic vein thrombosis.

    Science.gov (United States)

    McIntyre, Brittany; Marsh, Melanie; Walden, Jeffrey

    2016-06-01

    This report details a 58-year-old gentleman who presented to his outpatient primary care physician's clinic several times over four weeks for ongoing epigastric pain radiating into his left flank, dry heaving, and constipation. He was presumed to have gastritis at each visit and prescribed escalating doses of proton pump inhibitors. Due to the unrelenting pain, he eventually was admitted to the hospital and diagnosed with splenic vein thrombosis after computed tomography imaging of the abdomen. Our literature search revealed that pancreatic pathology is overwhelmingly the contributing factor to splenic vein thrombosis. Our patient had prominent collateral vasculature, suggesting that his splenic vein thrombosis was chronic in nature and likely the cause of his ongoing abdominal pain. Splenic vein thrombosis is an uncommon cause of abdominal pain, but one that should be included in the treating physician's differential diagnoses when abdominal pain is ongoing despite medical therapy. Although he had no evidence of initial findings on radiography, our patient was eventually diagnosed with biopsy-proven pancreatic cancer. Our case report demonstrates how patients presenting with persistent or worsening abdominal pain despite the use of proton pump inhibitors or other acid reducing agents and potential 'red flag' findings such as decreased appetite and weight loss should be worked up for other potential sources of abdominal pathology.

  8. A RARE VARIATION OF GREAT SAPHENOUS VEIN

    Directory of Open Access Journals (Sweden)

    Nakhate Manisha

    2014-11-01

    Full Text Available The venous system is more complex and variable than arterial system due to its frequent anatomical variations. This paper discusses the anatomy of the great saphenous vein and its variation observed in a male cadaver of around 60 years old.

  9. RETINAL VEIN OCCLUSIONS - A CLINICAL STUDY

    Directory of Open Access Journals (Sweden)

    Ramadevi

    2015-11-01

    Full Text Available Retinal vein occlusion is the most common retinal occlusive disorder encountered by opthalmologists and is usually associated with a variable amount of visual loss.The study was conducted over a period of 22 months, we performed a combined analysis of risk factors, clinical presentation, management and complication of these 51 patients

  10. Risk factors of thrombosis in abdominal veins

    Institute of Scientific and Technical Information of China (English)

    Amit Kumar Durra; Ashok Chacko; Biju George; Joseph Anjilivelil Joseph; Sukesh Chandran Nair; Vikram Mathews

    2008-01-01

    AIM: To estimate the prevalence of inherited and acquired thrombophilic risk factors in patients with abdominal venous thrombosis and to compare the risk factor profiles between Budd-Chiari syndromes (BCS) and splanchnic vein thrombosis (SVT).METHODS: In this retrospective study, 36 patients with abdominal venous thrombosis were studied.The patients were divided into Budd-Chiari group (hepatic vein, IVC thrombosis) and splanchnic venous thrombosis group (portal, splenic, superior mesenteric veins) based on the veins involved. Hereditary and acquired thrombophilic risk factors were evaluated in all patients.RESULTS: Twenty patients had SVT, 14 had BCS,and 2 had mixed venous thrombosis. Ten patients (28%) had hereditary and 10 patients (28%) acquired thrombophilic risk factors. The acquired risk factors were significantly more common in the SVT group (SVT vs BCS:45% vs 7%,x2=5.7,P=0.02) while hereditary risk factors did not show significant differences between the two groups (SVT vs BCS: 25%vs 36%, x2=0.46,P=0.7). Multiple risk factors were present in one (7%) patient with BCS and in 3 patients (15%) with SVT. No risk factors were identified in 57% of patients with BCS and in 45% of patients with SVT.CONCLUSION: Hereditary and acquired risk factors play an important role in the etiopathogenesis of abdominal venous thrombosis. Acquired risk factors are significantly more common in SVT patients while hereditary factors are similar in both groups.

  11. Gene Variants Associated With Deep Vein Thrombosis

    NARCIS (Netherlands)

    Bezemer, Irene D.; Bare, Lance A.; Doggen, Carine J.M.; Arellano, Andre R.; Tong, Carmen; Rowland, Charles M.; Catanese, Joseph; Young, Bradford A.; Reitsma, Pieter H.; Devlin, James J.; Rosendaal, Frits R.

    2008-01-01

    Context The genetic causes of deep vein thrombosis (DVT) are not fully understood. Objective To identify single-nucleotide polymorphisms (SNPs) associated with DVT. Design, Setting, and Patients We used 3 case-control studies of first DVT. A total of 19 682 gene-centric SNPs were genotyped in 44

  12. Small saphenous vein: where does reflux go?

    Directory of Open Access Journals (Sweden)

    Guillermo Gustavo Rossi

    2013-06-01

    Full Text Available BACKGROUND: The anatomy of small saphenous vein (SSV is very variable because of its complex embryological origin. SSV incompetence often causes reflux that goes to the perforating veins, sometimes not respecting the anatomical course. OBJECTIVE: To analyze differences in reflux direction and reentry in the SSV. METHODS: In this prospective, observational study, 60 lower limbs with SSV incompetence of 43 patients were assessed using a color Doppler ultrasound protocol. RESULTS: Reentry variations were grouped into four types and subtypes. Percentage results were: Type A, perforating veins on the medial side = 25/60 cases (41.66%; subtypes: Cockett, Sherman, paratibial and vertex; Type B, lateral malleolus and perforating veins on the lateral side (fibular 17-26 cm = 15/60 cases (25%; subtypes: fibular and malleolus; Type C, two branches = 19/60 cases (31.66%; subtypes: gastrocnemius and Cockett, gastrocnemius and malleolus, and/or fibular, Cockett and malleolus, Cockett-vertex and fibular; Type D, reflux in the superficial system = 1/60 cases (1.66%. CONCLUSION: On most of the lower limbs assessed, reflux did not follow the classical anatomic course. Our findings demonstrated a high degree of variation in reflux/reentry, but no SSV anatomical variations. Reflux seems to, either look for the most accessible anatomical connection for reentry or be originated in the distal area and then reach the SSV.

  13. Hands of early primates.

    Science.gov (United States)

    Boyer, Doug M; Yapuncich, Gabriel S; Chester, Stephen G B; Bloch, Jonathan I; Godinot, Marc

    2013-12-01

    Questions surrounding the origin and early evolution of primates continue to be the subject of debate. Though anatomy of the skull and inferred dietary shifts are often the focus, detailed studies of postcrania and inferred locomotor capabilities can also provide crucial data that advance understanding of transitions in early primate evolution. In particular, the hand skeleton includes characteristics thought to reflect foraging, locomotion, and posture. Here we review what is known about the early evolution of primate hands from a comparative perspective that incorporates data from the fossil record. Additionally, we provide new comparative data and documentation of skeletal morphology for Paleogene plesiadapiforms, notharctines, cercamoniines, adapines, and omomyiforms. Finally, we discuss implications of these data for understanding locomotor transitions during the origin and early evolutionary history of primates. Known plesiadapiform species cannot be differentiated from extant primates based on either intrinsic hand proportions or hand-to-body size proportions. Nonetheless, the presence of claws and a different metacarpophalangeal [corrected] joint form in plesiadapiforms indicate different grasping mechanics. Notharctines and cercamoniines have intrinsic hand proportions with extremely elongated proximal phalanges and digit rays relative to metacarpals, resembling tarsiers and galagos. But their hand-to-body size proportions are typical of many extant primates (unlike those of tarsiers, and possibly Teilhardina, which have extremely large hands). Non-adapine adapiforms and omomyids exhibit additional carpal features suggesting more limited dorsiflexion, greater ulnar deviation, and a more habitually divergent pollex than observed plesiadapiforms. Together, features differentiating adapiforms and omomyiforms from plesiadapiforms indicate increased reliance on vertical prehensile-clinging and grasp-leaping, possibly in combination with predatory behaviors in

  14. Differences in subependymal vein anatomy may predispose preterm infants to GMH-IVH.

    Science.gov (United States)

    Tortora, Domenico; Severino, Mariasavina; Malova, Mariya; Parodi, Alessandro; Morana, Giovanni; Sedlacik, Jan; Govaert, Paul; Volpe, Joseph J; Rossi, Andrea; Ramenghi, Luca Antonio

    2017-06-06

    The anatomy of the deep venous system plays an important role in the pathogenesis of brain lesions in the preterm brain as shown by different histological studies. The aims of this study were to compare the subependymal vein anatomy of preterm neonates with germinal matrix haemorrhage-intraventricular haemorrhage (GMH-IVH), as evaluated by susceptibility-weighted imaging (SWI) venography, with a group of age-matched controls with normal brain MRI, and to explore the relationship between the anatomical features of subependymal veins and clinical risk factors for GMH-IVH. SWI venographies of 48 neonates with GMH-IVH and 130 neonates with normal brain MRI were retrospectively evaluated. Subependymal vein anatomy was classified into six different patterns: type 1 represented the classic pattern and types 2-6 were considered anatomic variants. A quantitative analysis of the venous curvature index was performed. Variables were analysed by using Mann-Whitney U and χ(2) tests, and a multiple logistic regression analysis was performed to evaluate the association between anatomical features, clinical factors and GMH-IVH. A significant difference was noticed among the six anatomical patterns according to the presence of GMH-IVH (χ(2)=14.242, p=0.014). Anatomic variants were observed with higher frequency in neonates with GMH-IVH than in controls (62.2% and 49.6%, respectively). Neonates with GMH-IVH presented a narrower curvature of the terminal portion of subependymal veins (p<0.05). These anatomical features were significantly associated with GMH-IVH (p<0.05). Preterm neonates with GMH-IVH show higher variability of subependymal veins anatomy confirming a potential role as predisposing factor for GMH-IVH. © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted.

  15. Hepatic vein Doppler waveform in patients with diffuse fatty infiltration of the liver

    Energy Technology Data Exchange (ETDEWEB)

    Oguzkurt, Levent [Department of Radiology, Adana Teaching and Medical Research Center, Baskent University, Adana 01250 (Turkey)]. E-mail: loguzkurt@yahoo.com; Yildirim, Tulin [Department of Radiology, Adana Teaching and Medical Research Center, Baskent University, Adana 01250 (Turkey); Torun, Dilek [Department of Nephrology, Adana Teaching and Medical Research Center, Baskent University, Adana (Turkey); Tercan, Fahri [Department of Radiology, Adana Teaching and Medical Research Center, Baskent University, Adana 01250 (Turkey); Kizilkilic, Osman [Department of Radiology, Adana Teaching and Medical Research Center, Baskent University, Adana 01250 (Turkey); Niron, E. Alp [Department of Radiology, Baskent University, Ankara (Turkey)

    2005-05-01

    Objective: To determine the incidence of abnormal hepatic vein Doppler waveform in patients with diffuse fatty infiltration of the liver (FIL). Materials and methods: In this prospective study, 40 patients with diffuse FIL and 50 normal healthy adults who served as control group underwent hepatic vein (HV) Doppler ultrasonography. The patients with the diagnosis of FIL were 23 men (57.5%) and 17 women aged 30-62 years (mean age {+-} S.D., 42 {+-} 12 years). Subjects in the control group were 27 men (54%) and 23 women aged 34-65 years (mean age {+-} S.D., 45 {+-} 14 years). The diagnosis of FIL was confirmed with computed tomography density measurements. The waveforms of HV were classified into three groups: regular triphasic waveform, biphasic waveform without a reverse flow, and monophasic or flat waveform. Etiological factors for FIL were diabetes mellitus (DM), hyperlipidemia and obesity (body mass index > 25). Serum lipid profile was obtained from all the patients with FIL. Results: Seventeen of the 40 patients (43%) with FIL had an abnormal HV Doppler waveform, whereas only one of the 50 (2%) healthy subjects had an abnormal waveform. The difference in the distribution of normal Doppler waveform pattern between the patients and the control group was significant (P < 0.001). No differences were found in the behaviour of the hepatic vein Doppler waveform in relation to the different etiologic factors for FIL (P > 0.05). There was not any correlation between the degree of fat infiltration and the hepatic vein waveform pattern (P = 0.60). Conclusion: Patients with fatty liver has a high rate of an abnormal hepatic vein Doppler waveform pattern which can be biphasic or monophasic. We could not find a relation between the etiological factors for FIL and the occurrence of an abnormal HV Doppler waveform.

  16. Evaluation of left renal vein entrapment using multidetector computed tomography

    Energy Technology Data Exchange (ETDEWEB)

    Poyraz, Ahmet K.; Onur, Mehmet R. [Dept. of Radiology, Firat Univ. School of Medicine, Elazig (Turkey)], e-mail: akursadpoyraz@yahoo.com.tr; Firdolas, Fatih [Dept. of Urology, Firat Univ. School of Medicine, Elazig (Turkey); Kocakoc, Ercan [Dept. of Radiology, Bezmialem Vakif Univ., School of Medicine, Istanbul (Turkey)

    2013-03-15

    Background: Nutcracker syndrome, also called left renal vein entrapment syndrome, is a cause of non-glomerular hematuria with difficulties in diagnosis. Multidetector computed tomography (MDCT) is a powerful tool to prevent unnecessary diagnostic procedures. Purpose: To retrospectively determine the prevalence of nutcracker phenomenon and nutcracker syndrome seen in MDCT in consecutive patients. Material and Methods: The institutional review board approved the study and waived the requirement for informed consent. Abdominal contrast-enhanced MDCT scans were reviewed from 1000 consecutive patients. MDCT scan assessment included renal vein diameter measurements and evaluation for the presence of anterior or posterior left renal vein entrapment. Electronic medical records and urine analysis reports of patients with left renal vein entrapment were reviewed. Student's t test was used to assess differences in renal vein diameter in patients with left renal vein entrapment. Results: Left renal vein entrapment was observed in 10.9% (109), retroaortic left renal vein in 6.5% (65), entrapment of left renal vein between superior mesenteric artery and aorta in 4.1% (41), and circumaortic left renal vein in 0.3% (3) of patients. Mean diameters of right (8.8 {+-} 1.9 mm) and unentrapped left (8.9 {+-} 1.8 mm) renal veins were not significantly different (P = 0.1). The mean diameter of anterior entrapped left renal veins (10.3 {+-} 2 mm) was significantly greater (P = 0.04) than contralateral renal veins (8.6 {+-} 2.1 mm) in their widest portion. In 8.8% of patients with the left renal vein entrapment, urine analysis showed isomorphic hematuria or proteinuria with no other known cause. Varicocele and pelvic congestion were seen in 5.5% of patients with the left renal vein entrapment. Conclusion: Left renal vein entrapment is not a rare entity and renal nutcracker phenomenon might be underdiagnosed.

  17. Hand Models Emerge in China

    Institute of Scientific and Technical Information of China (English)

    CHENGTIELIANG

    2003-01-01

    CHINESE women have now discovered that beautiful hands are realizable assets. A new career invites those with shapely hands: that of hand model. This nascent profession has great prospects, as images involving hands are essential in the advertising business for promotion of such products as jewelry, watches and cell phones. Certain film stars also employ standins for hand close-ups.

  18. Adventitial cystic disease of the common femoral vein presenting as deep vein thrombosis

    Directory of Open Access Journals (Sweden)

    Young-Kyun Kim

    2016-07-01

    Full Text Available Adventitial cystic disease of the common femoral vein is a rare condition. We herein report the case of a 50-year-old woman who presented with painless swelling in her left lower leg that resembled deep vein thrombosis. She underwent femoral exploration and excision of the cystic wall. The presentation, investigation, treatment, and pathology of this condition are discussed with a literature review.

  19. Hand eczema: An update

    Directory of Open Access Journals (Sweden)

    Chembolli Lakshmi

    2012-01-01

    Full Text Available Eczema, the commonest disorders afflicting the hands, is also the commonest occupational skin disease (OSD. In the dermatology outpatient departments, only the severe cases are diagnosed since patients rarely report with early hand dermatitis. Mild forms are picked up only during occupational screening. Hand eczema (HE can evolve into a chronic condition with persistent disease even after avoiding contact with the incriminated allergen / irritant. The important risk factors for hand eczema are atopy (especially the presence of dermatitis, wet work, and contact allergy. The higher prevalence in women as compared to men in most studies is related to environmental factors and is mainly applicable to younger women in their twenties. Preventive measures play a very important role in therapy as they enable the affected individuals to retain their employment and livelihood. This article reviews established preventive and therapeutic options and newer drugs like alitretinoin in hand eczema with a mention on the etiology and morphology. Identifying the etiological factors is of paramount importance as avoiding or minimizing these factors play an important role in treatment.

  20. Successful correction of unroofed coronary sinus with pulmonary vein stenosis.

    Science.gov (United States)

    Li, Yang; An, Qi; Zhang, Eryong

    2012-07-01

    We present a case of an infant with an unroofed coronary sinus associated with a persistent left superior vena cava draining into the left atrium, right superior pulmonary vein stenosis, an atretic left superior pulmonary vein and a double-outlet right ventricle. For pulmonary vein stenosis and atresia, we used a sutureless technique with an autologous pericardial patch to create a neoatrium.

  1. Primary varicose veins: Frequency, clinical significance and surgical treatment

    Directory of Open Access Journals (Sweden)

    Vasić Dragan M.

    2004-01-01

    Full Text Available INTRODUCTION According to the definition of the World Health Organization, varicose veins represent abnormally enlarged superficial veins having baggy or cylindrical shape. The most frequent cause of primary varicose veins is the insufficiency of long saphenous vein (LSV, but especially the basin of its connection with femoral vein and perforating veins. OBJECTIVE The objectives of these investigations were: the determination of insufficiency incidence of SSV in cases of LSV insufficiency; the establishment of association of insufficiency of perforating veins of the basin of LSV and SSV; the study of the results of surgical treatment of insufficiency and varicosity of both short and long saphenous veins. METHODS In this study, 100 patients (66 women and 34 men, average age 52.1 years, with clinical symptoms showing the insufficiency and varicosity of long saphenous vein with no change of deep vein system were examined. Ultrasonographic examinations were made using Color Doppler probes - 7.5 and 3.75 MHz (Toshiba Corevison SSA 350 A; the development of incompetence of long saphenous vein (LSV and short saphenous vein (SSV at the level of the junction as well as other incompetent valves were examined. The reflux was defined as a retrograde flow of the duration longer than 0.5 seconds. RESULTS The insufficiency of short saphenous vein was determined by ultrasonographic examination in 34%, while the insufficiency of perforating veins in 80% of patients. 40% of patients were operated (33.3% of females, and 52.9% of males. The most frequent indications for surgical treatment of superficial veins insufficiency were: strong varicosities, clear symptoms and signs, superficial thrombophlebitis and conditions after superficial thrombophlebitis. Surgical treatment was applied in 16% of patients due to recurrence in the basin of long saphenous vein, and in 6% of cases because of the recurrence in the basin of short saphenous vein. Data analysis failed to

  2. [Pelvic vein thrombosis with elevated D-dimer level and normal ultrasound scan of the femoral vein].

    Science.gov (United States)

    Stenberg, Morten Roos; Tveskov, Claus

    2014-01-13

    A 17-year-old female presented with an isolated pelvic vein thrombosis (PVT) which was not visualised at the first compression ultrasound scan of the femoral vein. Isolated PVT should be suspected when the patient demonstrates the possible symptoms of a deep vein thrombosis with unilateral leg swelling extending to the groin and a negative compression ultrasound scan of the femoral vein. Supplemental ultrasound scan with Doppler flow, computed tomography or magnetic resonance venography are alternative diagnostic modalities if PVT is suspected.

  3. Hepatic venous outflow reconstruction in adult right lobe living donor liver transplantation without middle hepatic vein

    Institute of Scientific and Technical Information of China (English)

    WU Hong; LU Qiang; CHEN Zhe-yu; MA Yu-kui; LI Jin; YANG Jia-yin; YAN Lü-nan; LI Bo; ZENG Yong; WEN Tian-fu; ZHAO Ji-chun; WANG Wen-tao; XU Ming-qing

    2007-01-01

    Background It is difficult and challenging to reconstruct hepatic venous outflow in adult right lobe living donor liver transplantation (LDLT) without the middle hepatic vein (MHV). Excessive perfusion of the portal vein and venous outflow obstruction will lead to acute congestion of the graft, ultimately resulting in primary nonfunction. Although various reconstruction patterns have been explored in many countries, there is currently no clear consensus. In this study we describe a technique to prevent "chocking" of the graft at the outflow anastomosis with the inferior vena cava (IVC) in LDLT using right lobe graft without the MHV.Methods A retrospective analysis was conducted on clinical data from 55 recipients undergoing LDLT using right lobe grafts without the MHV or reconstruction of hepatic venous outflow. The donor's right hepatic vein (RHV) was anastomosed with a triangular opening of the recipient IVC; the inferior right hepatic vein (IRHV), if large enough, was anastomosed directly to the IVC. The great saphenous vein (GSV) was used for reconstruction of significant MHV tributaries.Results No deaths occurred in any of the donors. Of the 55 recipients, complications occurred in 6, including hepaticvein stricture (1 case), small-for-size syndrome (1), hepatic artery thrombosis (1), intestinal bleeding (1), bile leakage (1),left subphrenic abscess and pulmonary infection (1). A total of three patients died, one from small-for-size syndrome and two from multiple system organ failure.Conclusions The multiple-opening vertical anastomosis was reconstructed with hepatic vein outflow. This technique alleviates surgical risk of living donors, ensures excellent venous drainage, and prevents vascular thromboses and primary nonfunction.

  4. Three-Fingered Robot Hand

    Science.gov (United States)

    Ruoff, C. F.; Salisbury, J. K.

    1984-01-01

    Mechanical joints and tendons resemble human hand. Robot hand has three "human-like" fingers. "Thumb" at top. Rounded tips of fingers covered with resilient material provides high friction for griping. Hand potential as prosthesis for humans.

  5. Isolated left innominate vein aneurysm: A rare cause of mediastinal widening

    Directory of Open Access Journals (Sweden)

    S G Dua

    2011-01-01

    Full Text Available Mediastinal widening in an adult is mostly nodal in origin. Occasionally vascular aneurysms may be the underlying cause, in which case the aorta or its branches are most frequently involved. Thoracic venous aneurysms, on the other hand, have been reported only in anecdotes, with fusiform aneurysm of the superior vena cava being the commonest. Isolated aneurysms involving the brachiocephalic/innominate vein are extremely rare. We describe detection of a saccular aneurysm of the innominate vein, as the underlying cause of mediastinal widening seen on a chest radiograph in a 42-year-old asymptomatic woman. The characteristic radiological findings of thoracic venous aneurysms are described with particular reference to the importance of multiplanar computed tomography in such settings. Also discussed is the role of imaging in the diagnosis and guiding the management of this rare entity.

  6. Contrast enhancement of mid and far infrared images of subcutaneous veins

    Science.gov (United States)

    Villaseñor-Mora, Carlos; Sanchez-Marin, Francisco J.; Garay-Sevilla, Maria E.

    2008-01-01

    A simple procedure to enhance the contrast of infrared images of subcutaneous veins is presented. This procedure implies the topical application of a substance which modifies the energy transfer process from the veins to the sensor of the infrared camera. After the application of the substance, energy is transferred in such a way that the image contrast is enhanced up to more than 400% of its original value. The duration of the effect spans for more than 11 min which is enough for many practical applications. This effect is shown through a series of infrared images of the hand, the foot and the neck of human subjects. The infrared spectra of the applied substance are presented to explain the related phenomena. The proposed procedure is innocuous, easy to achieve, time efficient, and of low cost.

  7. Comparison of surgical hand scrub and alcohol surgical hand rub on reducing hand microbial burden.

    Science.gov (United States)

    Ghorbani, Azam; Shahrokhi, Akram; Soltani, Zahra; Molapour, Azam; Shafikhani, Mahin

    2012-02-01

    This study was performed to compare the effects of two hand decontamination methods on the microbial burden of operating room staff hands. The surgical hand washing methods compared were a traditional surgical hand scrub using a povidone iodine solution, and a social wash using a liquid non-antibacterial soap followed by the application of an alcoholic hand rub.

  8. Treatment of recurrent varicose veins of the great saphenous vein by conventional surgery and endovenous laser ablation.

    NARCIS (Netherlands)

    Groenendael, L. van; Vliet, J.A. van der; Flinkenflogel, L.; Roovers, E.A.; Sterkenburg, S.M. van; Reijnen, M.M.P.J.

    2009-01-01

    OBJECTIVE: Varicose vein recurrence of the great saphenous vein (GSV) is a common, costly, and complex problem. The aim of the study was to assess feasibility of endovenous laser ablation (EVLA) in recurrent varicose veins of the GSV and to compare this technique with conventional surgical reinterve

  9. Biomimetic hand exotendon device (BiomHED) for functional hand rehabilitation in stroke.

    Science.gov (United States)

    Lee, Sang Wook; Landers, Katlin A; Park, Hyung-Soon

    2013-06-01

    Significant functional impairment of the hand is commonly observed among stroke survivors. In order to restore the functional use of the affected hand, we developed a biomimetic device that assists in generating functional movements of the hand. The device is actuated by exotendons that replicate the kinetic functional of the hand muscle-tendons, therefore it can reproduce the spatial finger joint coordination patterns of the functional manual tasks (e.g., power grip and pinch) with a reduced number of actuators. The system includes a thumb actuation mechanism, whose action is coordinated with finger exotendons to perform various manual tasks, thereby restoring the functional use of the hand. This paper presents the design of the device and the preliminary data of the functional movement generation by the system.

  10. Thermographic visualization of the superficial vein and extravasation using the temperature gradient produced by the injected materials

    Science.gov (United States)

    Nakamura, Katsumasa; Sasaki, Tomonari; Ohga, Saiji; Yoshitake, Tadamasa; Terashima, Kotaro; Asai, Kaori; Matsumoto, Keiji; Shinoto, Makoto; Shioyama, Yoshiyuki; Nishie, Akihoro; Honda, Hiroshi

    2014-11-01

    There are few effective methods to detect or prevent the extravasation of injected materials such as chemotherapeutic agents and radiographic contrast materials. To investigate whether a thermographic camera could visualize the superficial vein and extravasation using the temperature gradient produced by the injected materials, an infrared thermographic camera with a high resolution of 0.04 °C was used. At the room temperature of 26 °C, thermal images and the time course of the temperature changes of a paraffin phantom embedded with rubber tubes (diameter 3.2 mm, wall thickness 0.8 mm) were evaluated after the tubes were filled with water at 15 °C or 25 °C. The rubber tubes were embedded at depths of 0 mm, 1.5 mm, and 3.0 mm from the surface of the phantom. Temperature changes were visualized in the areas of the phantom where the tubes were embedded. In general, changes were more clearly detected when greater temperature differences between the phantom and the water and shallower tube locations were employed. The temperature changes of the surface of a volunteer's arm were also examined after a bolus injection of physiological saline into the dorsal hand vein or the subcutaneous space. The injection of 5 ml room-temperature (26 °C) saline into the dorsal hand vein enabled the visualization of the vein. When 3 ml of room-temperature saline was injected through the vein into the subcutaneous space, extravasation was detected without any visualization of the vein. The subtraction image before and after the injection clearly showed the temperature changes induced by the saline. Thermography may thus be useful as a monitoring system to detect extravasation of the injected materials.

  11. Primary leiomyosarcoma of saphenous vein presenting as deep venous thrombosis.

    Science.gov (United States)

    Fremed, Daniel I; Faries, Peter L; Schanzer, Harry R; Marin, Michael L; Ting, Windsor

    2014-12-01

    Only a small number of venous leiomyosarcomas have been previously reported. Of these tumors, those of saphenous origin comprise a minority of cases. A 59-year-old man presented with symptoms of deep vein thrombosis and was eventually diagnosed with primary leiomyosarcoma of great saphenous vein origin. The tumor was treated with primary resection and femoral vein reconstruction with autologous patch. Although extremely rare, saphenous leiomyosarcoma can present as deep vein thrombosis. Vascular tumors should be included in the differential diagnosis of atypical extremity swelling refractory to conventional deep vein thrombosis management.

  12. A Recognition Method for Four Hand-Motion Patterns Based on Mechanomyographic Signal%基于肌音信号的四种手部动作模式的识别方法

    Institute of Scientific and Technical Information of China (English)

    曹炜; 夏春明; 曾勇; 曹恒

    2011-01-01

    Mechanomyography(MMG) refers to the "sound" of muscle contracting,with frequency band from 2 to 100 Hz.MMG signal as a physiological signal source has been gradually utilized and justified in the control of prosthetic hands recently.This paper developed a way of constructing a forearm hand-motion MMG feature space containing 18 time and frequency features,and principal component analysis(PCA) is adopted to reduce the feature dimensionality.Linear classifier algorithm is then applied to identify the four hand-motion patterns(hand close,hand open,wrist flexion and wrist extension).Forearm hand-motion MMG signals are acquired from 32 volunteers.The analysis results show that the average accuracy rate is above 95%,the recognition with three-channel acquisition configuration has the best overall performance,and the placement distribution of acquisition points on four forearm muscles has few effects on the accuracy rate.%肌音(MMG)是指肌肉收缩时发出的2~100 Hz的低频"声音"。近年来,有研究将前臂肌音信号作为生理信号源应用于假肢手的控制,并取得了一定的进展。利用主成分分析法(PCA)对多通道采集的前臂肌音信号的18个时、频域特征的特征空间进行降维,并采用线性分类器对4种手部动作模式(手掌握紧、手掌张开、腕部弯曲、腕部伸直)进行判别。用本方法对32名受试者的前臂肌音信号进行采集分析研究,并对通道数的确定和采集位置敏感性等作了研究。实验结果表明:该方法可以实现高达95%以上的识别率,在1~4通道采集点分布于前臂4块肌肉的情况下,采用3个通道综合性能最优,采用4个通道无明显优势,4块肌肉采集位置的选取对识别效果基本没有影响。

  13. Safety and efficacy of cryopreserved homologous veins for venous reconstruction in pancreatoduodenectomy.

    Science.gov (United States)

    Yamamoto, Masaki; Akamatsu, Nobuhisa; Aoki, Taku; Sakamoto, Yoshihiro; Tamura, Sumihito; Hasegawa, Kiyoshi; Kokudo, Norihiro

    2017-02-01

    There are several techniques for reconstructing the portal vein-superior mesenteric vein during pancreatoduodenectomy. The aim of the present study was to present our results with portal vein-superior mesenteric vein reconstruction using cryopreserved homologous veins during pancreatoduodenectomy for patients with pancreatic head cancer. Patients who underwent pancreatoduodenectomy for pancreatic head cancer were reviewed retrospectively. In patients with portal vein-superior mesenteric vein resection, the detailed method of reconstruction and clinical outcomes were reviewed. Clinical characteristics, patient survival, and portal vein-superior mesenteric vein patency were compared between those with and without homologous vein grafts. Factors affecting the patency of reconstructed veins were assessed by univariate analysis. Among 144 patients undergoing pancreatoduodenectomy, portal vein-superior mesenteric vein resection was performed in 36 patients (25%); 18 (50%) underwent reconstruction with homologous veins, and the other 18 (50%) underwent reconstruction without homologous veins. The extent of portal vein-superior mesenteric vein involvement, operative time, duration of clamping of portal vein-superior mesenteric vein, intraoperative blood loss, and length of the venous resection were greater (P ≤ .013 each) in those with homologous vein grafts. There was no significant difference in postoperative morbidity/mortality, patient survival, or portal vein-superior mesenteric vein patency. The 1- and 2-year overall patency of portal vein-superior mesenteric vein was 76% and 71%, respectively, while the 2-year patencies were 67% and 67% in those with homologous veins and 87% and 73% in those without homologous veins without difference between the groups. Circumferential resection and pathologic portal vein-superior mesenteric vein involvement were associated with the patency of the reconstructed vein (P = .002 and P = .028, resp). Use of homologous venous

  14. Wash Your Hands

    Centers for Disease Control (CDC) Podcasts

    2010-03-08

    This video shows kids how to properly wash their hands, one of the most important steps we can take to avoid getting sick and spreading germs to others.  Created: 3/8/2010 by Centers for Disease Control and Prevention (CDC).   Date Released: 3/8/2010.

  15. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... practice hand hygiene in hospitals and other healthcare facilities. Release Date: 8/4/2010 Source: Healthcare-associated ... choose "Save target as…", save file in desired location. Firefox/Chrome: Right-click on the link, choose " ...

  16. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... CDC-TV videos cover a variety of health, safety and preparedness topics and include closed-captioning. Videos are prepared for different audiences including, children, parents, and public health professionals. More > Hand Hygiene Saves Lives (5:10) Recommend on Facebook Tweet ...

  17. De hand van Huizinga

    NARCIS (Netherlands)

    Huizinga, Johan

    2009-01-01

    De hand van Huizinga bevat een nieuwe selectie van de belangrijkste essays uit het omvangrijke oeuvre van de wereldberoemde Nederlandse historicus Johan Huizinga. Deze essays en studies zijn geselecteerd op basis van de diverse disciplines waarmee Huizinga zich bezighield - van de Middeleeuwen tot

  18. Shanghai Hand Puppet Tcoupe

    Institute of Scientific and Technical Information of China (English)

    1993-01-01

    PUPPETRY n ancient artform, has had difficulties ca-tering to children’s aesthet-ic needs and perceptions.ShanghaiHand Puppet Troupe has,however,successfully reached children audi-ences with its new science fictlonpiece,Nuozha Meets the Inhabitants of Tai star.

  19. Hands-On Hydrology

    Science.gov (United States)

    Mathews, Catherine E.; Monroe, Louise Nelson

    2004-01-01

    A professional school and university collaboration enables elementary students and their teachers to explore hydrology concepts and realize the beneficial functions of wetlands. Hands-on experiences involve young students in determining water quality at field sites after laying the groundwork with activities related to the hydrologic cycle,…

  20. Passive hand prostheses.

    Science.gov (United States)

    Soltanian, Hooman; de Bese, Genevieve; Beasley, Robert W

    2003-02-01

    For many mangled hands, appropriately designed passive prostheses now available, alone or in conjunction with surgical reconstruction, can offer the best available improvement, provided they are of high quality and backed by prompt and reliable after-delivery services. Invariably, there is improvement in physical capability along with restoration of good social presentation.

  1. Put Your Hands Together

    Centers for Disease Control (CDC) Podcasts

    2011-03-24

    In this podcast, learn how to help stop the spread of infection and stay healthy. It's easy when you 'Put Your Hands Together.'.  Created: 3/24/2011 by National Center for Preparedness, Detection, and Control of Infectious Diseases (NCPDCID) and National Center for Zoonotic, Vector-Borne, and Enteric Diseases (NCZVED).   Date Released: 3/24/2011.

  2. Man and his hand

    NARCIS (Netherlands)

    J.C.H.M. van der Meulen (Jacques)

    1976-01-01

    textabstractIntroduction: In a world where mechanisation and automation have led to a devaluation of skilled manual work, and where only certain press and publicity media doubt the superiority of the mind, the following operating-theatre dialogue is refreshing: Surgeon: The surgeon's hands are his f

  3. Hands-On Hydrology

    Science.gov (United States)

    Mathews, Catherine E.; Monroe, Louise Nelson

    2004-01-01

    A professional school and university collaboration enables elementary students and their teachers to explore hydrology concepts and realize the beneficial functions of wetlands. Hands-on experiences involve young students in determining water quality at field sites after laying the groundwork with activities related to the hydrologic cycle,…

  4. Rotationally Actuated Prosthetic Hand

    Science.gov (United States)

    Norton, William E.; Belcher, Jewell G., Jr.; Carden, James R.; Vest, Thomas W.

    1991-01-01

    Prosthetic hand attached to end of remaining part of forearm and to upper arm just above elbow. Pincerlike fingers pushed apart to degree depending on rotation of forearm. Simpler in design, simpler to operate, weighs less, and takes up less space.

  5. Ligation of superior mesenteric vein and portal to splenic vein anastomosis after superior mesenteric-portal vein confluence resection during pancreaticoduodenectomy – Case report

    Directory of Open Access Journals (Sweden)

    Jianlin Tang

    2014-12-01

    Conclusion: The lessons we learned are (1 Before SMPV confluence resection, internal jugular vein graft should be ready for reconstruction. (2 Synthetic graft is an alternative for internal jugular vein graft. (3 Direct portal vein to SMV anastomosis can be achieved by mobilizing liver. (4 It is possible that venous collaterals secondary to SMV tumor obstruction may have allowed this patient's post-operative survival.

  6. Prostanoids counterbalance the synergism between endothelin-1 and angiotensin II in mesenteric veins of trained rats.

    Science.gov (United States)

    Chies, Agnaldo Bruno; de Oliveira, Priscilla Bianca; Rossignoli, Patrícia de Souza; Baptista, Rafaela de Fátima Ferreira; de Lábio, Roger William; Payão, Spencer Luiz Marques

    2017-02-01

    Exercise-induced adaptations of the modulating mechanisms that influence the angiotensin (Ang II) responses assume different features depending on the venous bed. In femoral veins, exercise mobilizes vasodilator prostanoids to cooperate with NO in order to maintain reduced Ang II responses. On the other hand, exercise's influence on the Ang II responses in veins that drain blood from the mesenteric region has been poorly described. Therefore, the present study aimed to identify the effects of a single bout of exercise, as well as exercise training, on the Ang II responses in mesenteric veins. The present study also aimed to investigate the involvement of prostanoids, NO and ET-1 in eventual exercise-induced modifications in these veins. To this end, mesenteric veins taken from resting-sedentary, exercised-sedentary, resting-trained and exercised-trained animals were studied in organ baths. In addition, the mRNA expression of prepro-endothelin-1 (ppET-1), as well as that of the ETA and ETB receptors, were quantified by real-time PCR in these veins. The results show that, either in absence or in presence of L-NAME, the Ang II responses were not different between groups. In the presence of indomethacin, higher Ang II responses were observed in the resting-trained animals than in the resting-sedentary animals. This difference, however, disappeared when L-NAME, BQ-123 or BQ-788 were added during incubation. In addition, no differences in ppET-1, ETA or ETB mRNA expression were observed between groups. Furthermore, in the presence of PD123,319, the Ang II responses in the exercised-sedentary animals were higher than those in the resting-sedentary animals. In conclusion, exercise training mobilizes endothelin-1 (ET-1) to reinforce the Ang II-induced responses mainly through ETA activation. On the other hand, vasodilator prostanoids are mobilized to act in parallel with NO in order to counterbalance the Ang II responses that have been potentiated by ET-1 in these trained

  7. Clinical Features of Primary Vein Grafts in Free Tissue Transfers

    Directory of Open Access Journals (Sweden)

    Mitsuru Nemoto

    2015-01-01

    Full Text Available The outcomes of free tissue transfers combined with vein grafts have been inconsistent, and discussions continue regarding their appropriate use. Of the 142 free tissue transfers that we performed from January 2004 to December 2011, we retrospectively analyzed 15 consecutive patients who underwent free tissue transfers in combination with vein grafts. Etiologies included trauma (8 patients, infection (4, and tumor (3. Types of free tissue transfers were fibula (4, anterolateral thigh (3, groin (3, jejunum (3, latissimus dorsi (1, and dorsal pedis (1. Vein grafts were used for the artery (6, vein (2, or both (7. The donor veins were the saphenous vein (12 and the external jugular vein (3. The mean length of the grafted veins was 10.8 cm (range: 4–18 cm. Even though complications of congestion occurred in 2 patients, these flaps survived by reexploration. The flap success rate was 15 of 15 (100% of vein grafted free flaps versus 124 of 127 (97.6% of free flaps not requiring vein grafts. To improve the success rate of free tissue transfers combined with vein grafts, securing healthy recipient vessels, meticulous surgical handling, a reliable vascular anastomosis technique, and strict postoperative monitoring are crucial.

  8. A pilot/introducer needle for central vein cannulation.

    Science.gov (United States)

    Suzuki, T; Kanazawa, M; Kinefuchi, Y; Fukuyama, H; Takiguchi, M; Yamamoto, M; Abe, K; Okuda, Y

    1995-12-01

    A kit for safe and easy insertion of a central vein cannula was devised. A small gauge (22 gauge) metal pilot needle was equipped with a Y-shaped hub which had a side-port to accept a small gauge (0.46 mm) Seldinger guide wire. Once the needle reached the vein, guidewire was threaded in through the side-port. There was no need to remove the pilot needle and no need to repeat vein puncture with a larger-bore needle. Three puncture methods were used with the kit: (1) the central approach via the internal jugular vein, (2) the supraclavicular approach via the junction of the internal jugular vein and subclavian vein, and (3) the infraclavicular approach via the subclavian vein. Each method was used on 20 patients, for total of 60 patients, with a high success rate. Less than 3 minutes were required from puncture to catheter insertion. No serious complications were encountered.

  9. Absent right superior caval vein in situs solitus

    DEFF Research Database (Denmark)

    Lytzen, Rebekka; Sundberg, Karin; Vejlstrup, Niels

    2015-01-01

    no postnatal complications. All children were found to have healthy hearts at follow-up. CONCLUSIONS: In all cases, the findings proved to be a benign condition with no clinical manifestations or complications. Although isolated absent right superior caval vein does not seem to affect the outcome, associated......Introduction In up to 0.07% of the general population, the right anterior cardinal vein obliterates and the left remains open, creating an absent right superior caval vein and a persistent left superior caval vein. Absent right superior caval vein is associated with additional congenital heart...... disease in about half the patients. We wished to study the consequences of absent right superior caval vein as an incidental finding on prenatal ultrasonic malformation screening. Material and methods This is a retrospective case series study of all foetuses diagnosed with absent right superior caval vein...

  10. [Treatment of renal vein thrombosis associated with nephrotic syndrome].

    Science.gov (United States)

    Funami, M; Takaba, T; Tanaka, H; Murakami, A; Kadokura, M; Hori, G; Ishii, J

    1988-06-01

    Renal vein thrombosis is a rare entity in which true incidence is unknown. The disease occurs most frequently in patients with nephrotic syndrome, but it also can occur in the presence of other hypercoagulable state. Two cases of renal vein thrombosis with nephrotic syndrome which were treated by thrombectomy are reported here. One patient was successfully treated by renal vein and inferior vena cava thrombectomy before developing severe pulmonary embolism. The other was treated by renal vein thrombectomy by which fatal shock was able to be prevented. In those cases, immediate operation was indicated, primarily to prevent additional, possibly fatal, pulmonary embolism and also to improve perfusion of the kidney. In the hope of salvaging the kidney, thrombectomy may be the treatment of choice for acute renal vein thrombosis, complication of pulmonary embolism and inferior vena cava thrombosis, right renal vein thrombosis without collateral flow and acute renal vein thrombosis with shock.

  11. Neural control of hand muscles during prehension.

    Science.gov (United States)

    Johnston, Jamie A; Winges, Sara A; Santello, Marco

    2009-01-01

    In the past two decades a large number of studies have successfully characterized important features of the kinetics and kinematics of object grasping and manipulation, providing significant insight into how the Central Nervous System (CNS) controls the hand, one of the most complex motor systems, in a variety of behaviors. In this chapter we briefly review studies of hand kinematics and kinetics and highlight their major findings and open questions. The major focus of this chapter is on the neural control of the hand, an objective that has been pursued by studies on electromyography (EMG) of hand muscles. Here we review what has been learned through different yet complementary methodological approaches. In particular, the study of single motor unit activity has revealed how the distribution of common neural input within and across hand muscles might reflect a muscle-pair specific organization. Studies of motor unit population have revealed important synergistic patterns of muscle activity while also revealing muscle-pair specific patterns of neural coupling. We conclude the chapter with the results of recent simulation studies aiming at combining advantages of single and multi-unit recordings to maximize the amount of information that can be extracted from EMG signal analysis.

  12. The great brain versus vein debate.

    Science.gov (United States)

    Menon, Ravi S

    2012-08-15

    From the earliest fMRI experiments, it was quickly appreciated by those working with BOLD at high field that the signal change originated from visible veins whose spatial localization was relatively coarse ("the macrovasculature"), and smaller vessels ("the microvasculature") that were not individually visible in BOLD images. It was expected that a functional brain imaging technique that was predominantly sensitive to the macrovasculature would not have the same effective resolution as one sensitive to the microvasculature. Elimination of the venous signal and enhancement of the microvascular one offered the tantalizing ability to image columnar and lamellar structures in the brain and distinguished fMRI from its predecessor techniques. This article reviews a brief history of how these signal sources were first identified and separated and some of the controversy associated with the "brain versus vein" debate.

  13. Ovarian vein thrombosis in a polytrauma patient.

    Science.gov (United States)

    Toman, Emma; Beaven, Alastair; Balogun, Moji; Porter, Keith

    2015-12-18

    A young mother presented to a major trauma centre following a road traffic collision. Her admission CT traumagram demonstrated liver and renal lacerations, spinal and pelvic fractures with no abnormalities of the ovarian veins. Her inpatient course was uncomplicated other than a sustained, isolated raised C reactive protein. CT of the abdomen 1 week after injury demonstrated stable solid organ injuries and the additional, unexpected finding of a right ovarian vein thrombosis (OVT). A pragmatic approach was taken towards the management of the OVT given the haemorrhagic risk from her traumatic injuries. A multidisciplinary, consultant-led plan was made to slowly increase enoxaparin to a therapeutic dose under close surveillance and to then switch to warfarin following an outpatient consultation with a consultant haematologist. A MR venogram was performed after 3 months of anticoagulation, and this demonstrated complete resolution of the OVT and normal appearances of the ovary.

  14. Pulmonary vein stenosis: Etiology, diagnosis and management

    Institute of Scientific and Technical Information of China (English)

    Pablo Pazos-López; Cristina García-Rodríguez; Alba Guitián-González; Emilio Paredes-Galán; María ángel; De La Guarda álvarez-Moure; Marta Rodríguez-álvarez; José Antonio Baz-Alonso; Elvis Teijeira-Fernández; Francisco Eugenio Calvo-Iglesias; Andrés í?iguez-Romo

    2016-01-01

    Pulmonary vein stenosis(PVS) is rare condition characterized by a challenging diagnosis and unfavorable prognosis at advance stages. At present, injury from radiofrequency ablation for atrial fibrillation has become the main cause of the disease. PVS is characterized by a progressive lumen size reduction of one or more pulmonary veins that, when hemodynamically significant, may raise lobar capillary pressure leading to signs and symptoms such as shortness of breath, cough, and hemoptysis. Image techniques(transesophageal echocardiography, computed tomography, magnetic resonance and perfusion imaging) are essential to reach a final diagnosis and decide an appropriate therapy. In this regard, series from referral centers have shown that surgical and transcatheter interventions may improve prognosis. The purpose of this article is to review the etiology, assessment and management of PVS.

  15. Doppler spectral characteristics of infrainguinal vein bypasses

    DEFF Research Database (Denmark)

    Nielsen, Tina G; von Jessen, F; Sillesen, H

    1993-01-01

    With the aim of assessing the velocity profile of femoropopliteal and femorocrural vein bypasses, 128 patients undergoing infrainguinal vein bypass surgery entered a postoperative Duplex surveillance protocol, which included clinical assessment and Duplex scanning, using Doppler spectral analysis...... of arteriovenous fistulas the initially antegrade diastolic velocity was replaced by a retrograde flow within 3 months, whereas a forward flow in diastole was sustained in grafts with patent fistulas. Abnormal Duplex findings in 31 patients led to angiography and revision in 13 cases. Four revised grafts failed......, while nine remained patent at follow-up 1-12 months later. Ten (56%) of 18 non-revised bypasses with abnormal Duplex findings failed within 9 months compared to 1 (1%) of 76 bypasses with a normal velocity profile (p analysis provides...

  16. Automated image analysis for diameters and branching points of cerebral penetrating arteries and veins captured with two-photon microscopy.

    Science.gov (United States)

    Sugashi, Takuma; Yoshihara, Kouichi; Kawaguchi, Hiroshi; Takuwa, Hiroyuki; Ito, Hiroshi; Kanno, Iwao; Yamada, Yukio; Masamoto, Kazuto

    2014-01-01

    The present study was aimed to characterize 3-dimensional (3D) morphology of the cortical microvasculature (e.g., penetrating artery and emerging vein), using two-photon microscopy and automated analysis for their cross-sectional diameters and branching positions in the mouse cortex. We observed that both artery and vein had variable cross-sectional diameters across cortical depths. The mean diameter was similar for both artery (17 ± 5 μm) and vein (15 ± 5 μm), and there were no detectable differences over depths of 50-400 μm. On the other hand, the number of branches was slightly increased up to 400-μm depth for both the artery and vein. The mean number of branches per 0.1 mm vessel length was 1.7 ± 1.2 and 3.8 ± 1.6 for the artery and vein, respectively. This method allows for quantification of the large volume data of microvascular images captured with two-photon microscopy. This will contribute to the morphometric analysis of the cortical microvasculature in functioning brains.

  17. Reverse Regulatory Pathway (H2S / PGE2 / MMP in Human Aortic Aneurysm and Saphenous Vein Varicosity.

    Directory of Open Access Journals (Sweden)

    Ingrid Gomez

    Full Text Available Hydrogen sulfide (H2S is a mediator with demonstrated protective effects for the cardiovascular system. On the other hand, prostaglandin (PGE2 is involved in vascular wall remodeling by regulating matrix metalloproteinase (MMP activities. We tested the hypothesis that endogenous H2S may modulate PGE2, MMP-1 activity and endogenous tissue inhibitors of MMPs (TIMP-1/-2. This regulatory pathway could be involved in thinning of abdominal aortic aneurysm (AAA and thickening of saphenous vein (SV varicosities. The expression of the enzyme responsible for H2S synthesis, cystathionine-γ-lyase (CSE and its activity, were significantly higher in varicose vein as compared to SV. On the contrary, the endogenous H2S level and CSE expression were lower in AAA as compared to healthy aorta (HA. Endogenous H2S was responsible for inhibition of PGE2 synthesis mostly in varicose veins and HA. A similar effect was observed with exogenous H2S and consequently decreasing active MMP-1/TIMP ratios in SV and varicose veins. In contrast, in AAA, higher levels of PGE2 and active MMP-1/TIMP ratios were found versus HA. These findings suggest that differences in H2S content in AAA and varicose veins modulate endogenous PGE2 production and consequently the MMP/TIMP ratio. This mechanism may be crucial in vascular wall remodeling observed in different vascular pathologies (aneurysm, varicosities, atherosclerosis and pulmonary hypertension.

  18. Reverse Regulatory Pathway (H2S / PGE2 / MMP) in Human Aortic Aneurysm and Saphenous Vein Varicosity.

    Science.gov (United States)

    Gomez, Ingrid; Ozen, Gulsev; Deschildre, Catherine; Amgoud, Yasmine; Boubaya, Lilia; Gorenne, Isabelle; Benyahia, Chabha; Roger, Thomas; Lesèche, Guy; Galardon, Erwan; Topal, Gokce; Jacob, Marie-Paule; Longrois, Dan; Norel, Xavier

    2016-01-01

    Hydrogen sulfide (H2S) is a mediator with demonstrated protective effects for the cardiovascular system. On the other hand, prostaglandin (PG)E2 is involved in vascular wall remodeling by regulating matrix metalloproteinase (MMP) activities. We tested the hypothesis that endogenous H2S may modulate PGE2, MMP-1 activity and endogenous tissue inhibitors of MMPs (TIMP-1/-2). This regulatory pathway could be involved in thinning of abdominal aortic aneurysm (AAA) and thickening of saphenous vein (SV) varicosities. The expression of the enzyme responsible for H2S synthesis, cystathionine-γ-lyase (CSE) and its activity, were significantly higher in varicose vein as compared to SV. On the contrary, the endogenous H2S level and CSE expression were lower in AAA as compared to healthy aorta (HA). Endogenous H2S was responsible for inhibition of PGE2 synthesis mostly in varicose veins and HA. A similar effect was observed with exogenous H2S and consequently decreasing active MMP-1/TIMP ratios in SV and varicose veins. In contrast, in AAA, higher levels of PGE2 and active MMP-1/TIMP ratios were found versus HA. These findings suggest that differences in H2S content in AAA and varicose veins modulate endogenous PGE2 production and consequently the MMP/TIMP ratio. This mechanism may be crucial in vascular wall remodeling observed in different vascular pathologies (aneurysm, varicosities, atherosclerosis and pulmonary hypertension).

  19. Modification of hand reconstruction with unilateral foot donation

    Institute of Scientific and Technical Information of China (English)

    FAN Cun-yi; LIU Xu-dong; CAI Pei-hua; JIANG Pei-zhu; YU Zhong-jia; ZENG Bing-fang

    2007-01-01

    @@ Multiple toes transplantation is an effective method for restoring the prehension of the hands.1-5 Generally, the thumb, index and middle finger are reconstructed by transferring a free big toe skin-nail flap with the second and third toes from a same foot. The great saphenous vein, superficial veins on the dorsum of the foot, the dorsalis pedis artery, and the first dorsal metatarsal artery are resected to be used as the donor pedicle. The arterial pedicle is freed up to the dorsal digital artery of the big and second toes. Both the second and third toes are supplied by the dorsal digital artery of the second toe on the tibial side. By using unilateral toe donation to reconstruct a digitless hand, we can preserve the normal form and function of the contralateral foot.However, because of the small length of the digital arteries between the big and second toes, the first web space is limited. Here we present our experiences on two cases of hand reconstruction with unilateral three toes transplantation. Good function and motion range of the thumb were achieved in both the patients.

  20. Massive hydrothorax following subclavian vein catheterization

    OpenAIRE

    Omar, Hesham R.; fathy, Ahmad; Elghonemy, Mohamed; Rashad, Rania; Helal, Engy; Mangar, Devanand; Camporesi, Enrico

    2010-01-01

    Since the introduction of central venous catheterization for monitoring of the venous pressure, fluid infusion and hyperalimentation, the literature has been full of serious life-threatening complications. Of these complications is the false positioning of the central venous catheter and subsequent development of pleural effusion. In this report we are describing a case of iatrogenic massive pleural effusion following subclavian vein catheterization necessitating intercostal tube drainage and...

  1. Central Vein Preservation in Critical Venous Access.

    Science.gov (United States)

    Davidson, J; Paul, A; Patel, S; Davenport, M; Ade-Ajayi, N

    2016-08-01

    Introduction The lack of suitable veins in children with critical central venous access requirements is a major obstacle to optimal care and is potentially life-threatening. We present outcomes following the use of vein-preserving (VP) surgical techniques, notably the sheath exchange for tunneled lines (SETL). Materials and Methods A retrospective, single observer analysis of a prospectively maintained departmental logbook as well as the medical records of patients. Two broad groups of central line replacements were identified; those inserted following removal of a previous line and a traditional "plastic-free" (PF) period and those exchanged without such an interval. Results Overall, 19 lines were directly exchanged during the study period and compared with 34 inserted after a PF period. Similar catheter life spans and infection rates were demonstrated in each group; 125 (range, 78-173) days in VP exchanges versus 122 (range, 70-175) days in PF replacements (p = 0.41). Line Sepsis resulting in removal or change of line occurred at 103 (range, 60-147) days in VP group versus 104 (range, 45-164) days in PF (p = 0.73). Conclusion For children with critical venous access requirements, direct line exchange procedures are a robust and reproducible means of vein preservation. The outcomes compare favorably with those following the more traditional removal, a PF period and reinsertion.

  2. Portal vein thrombosis related to Cassia angustifolia.

    Science.gov (United States)

    Soyuncu, Secgin; Cete, Yildiray; Nokay, Ali E

    2008-09-01

    Cassia angustifolia (Senna), used as a laxative, is a plant from the Fabaceae family. It includes hydroxyanthracene glycosides, also known as Senna Sennoside. These glycosides stimulate the peristalsis of the colon and alter colonic absorption and secretion resulting in fluid accumulation and expulsion. In the literature, there are reports illustrating the hepatotoxic effects of Cassia angustifolia but there is no report of portal vein thrombosis caused by Cassia Angustifolia. A 42-year-old woman was admitted to the emergency department with a five-day history of worsening epigastric pain, anorexia, episodic vomiting, and intermittent fever. She reported that she had boiled dried senna leaves she had bought from herbalists and drank approximately 200 mL daily for two years. Color Doppler screening found an echogen thrombus obliterating portal vein bifurcation and the right branch. The lumen was obstructed at this level and there was no blood flow through it. Treatment with thrombolytics was unsuccessful. Severe hepatotoxicity senna use is unusual. The cause of senna-related hepatotoxicity is unclear but could be explained by the exposure of the liver to unusual amounts of toxic metabolites of anthraquinone glycosides. Chronic use of Cassia angustifolia may rarely be associated with portal vein thrombosis.

  3. Laser photocoagulation for retinal vein occlusion

    Directory of Open Access Journals (Sweden)

    K. A. Mirzabekova

    2015-03-01

    Full Text Available Retinal vein occlusion (RVO is one of the leading causes of permanent vision loss. In adults, central retinal vein occlusion (CRVO occurs in 1.8% while branch retinal vein occlusion (BRVO occurs in 0.2%. Treatment strategy and disease prognosis are determined by RVO type (ischemic/non-ischemic. Despite numerous studies and many current CRVO and BRVO treatment approaches, the management of these patients is still being debated. Intravitreal injections of steroids (triamcinolone acetate, dexamethasone and vascular endothelial growth factor (VEGF inhibitors (bevacizumab, ranibizumab were shown to be fairly effective. However, it is unclear whether anti-VEGF agents are reasonable in ischemic RVOs. Laser photocoagulation remains the only effective treatment of optic nerve head and/or retinal neovascularization. Laser photocoagulation is also indicated for the treatment of macular edema. Both threshold and sub-threshold photocoagulation may be performed. Photocoagulation performed with argon (514 nm, krypton (647 nm, or diode (810 nm laser for macular edema provides similar results (no significant differences. The treatment may be complex and include medication therapy and/or surgery. Medication therapy includes anti-aggregant agents and antioxidants, i.e., emoxypine which may be used in acute RVO as well as in post-thrombotic retinopathy. 

  4. Hand Movements and Braille Reading Efficiency: Data from the Alphabetic Braille and Contracted Braille Study

    Science.gov (United States)

    Wright, Tessa; Wormsley, Diane P.; Kamei-Hannan, Cheryl

    2009-01-01

    Using a subset of data from the Alphabetic Braille and Contracted Braille Study, researchers analyzed the patterns and characteristics of hand movements as predictors of reading performance. Statistically significant differences were found between one- and two-handed readers and between patterns of hand movements and reading rates. (Contains 6…

  5. Comparison between mechanical properties of human saphenous vein and umbilical vein

    Directory of Open Access Journals (Sweden)

    Hamedani Borhan

    2012-08-01

    Full Text Available Abstract Background As a main cause of mortality in developed countries, Coronary Artery Disease (CAD is known as silent killer with a considerable cost to be dedicated for its treatment. Coronary Artery Bypass Graft (CABG is a common remedy for CAD for which different blood vessels are used as a detour. There is a lack of knowledge about mechanical properties of human blood vessels used for CABG, and while these properties have a great impact on long-term patency of a CABG. Thus, studying these properties, especially those of human umbilical veins which have not been considered yet, looks utterly necessary. Methods Umbilical vein, as well as human Saphenous vein, are respectively obtained after cesarean and CABG. First, histological tests were performed to investigate different fiber contents of the samples. Having prepared samples carefully, force-displacement results of samples were rendered to real stress–strain measurements and then a fourth-order polynomial was used to prove the non-linear behavior of these two vessels. Results Results were analyzed in two directions, i.e. circumferentially and longitudinally, which then were compared with each other. The comparison between stiffness and elasticity of these veins showed that Saphenous vein’s stiffness is much higher than that of umbilical vein and also, it is less stretchable. Furthermore, for both vessels, longitudinal stiffness was higher than that of circumferential and in stark contrast, stretch ratio in circumferential direction came much higher than longitudinal orientation. Conclusion Blood pressure is very high in the region of aorta, so there should be a stiff blood vessel in this area and previous investigations showed that stiffer vessels would have a better influence on the flow of bypass. To this end, the current study has made an attempt to compare these two blood vessels’ stiffness, finding that Saphenous vein is stiffer than umbilical vein which is somehow as stiff as

  6. Non-cuffed dual lumen catheters in the external jugular veins versus other central veins for hemodialysis patients.

    Science.gov (United States)

    Moini, Majid; Rasouli, Mohammad R; Kenari, Mohammad Mahmoodzadeh; Mahmoodi, Hamid Reza

    2009-01-01

    To compare prospective between insertion of non-cuffed dual lumen catheter in the external jugular vein and other central veins for hemodialysis (HD), we studied 68 chronic dialysis patients randomly allocated into two groups: one with external jugular vein catheterization as access for HD and another with other central venous catheterization, internal jugular or subclavian vein. Our results showed there were no significant differences regarding successful cannulation, com-plications, total numbers of dialysis, development of pain and infection at the site of cannulation, patency rate of the catheters, and efficacy of hemodialysis between both groups. In addition, the patency of the catheter in the external jugular vein was not affected by previous cannulation of other central veins. In contrast, there was a significant correlation between numbers of attempts for cannulation in both groups and development of hematoma and infection, (pvein may be an alternative for other central veins for insertion of temporary non-cuffed hemodialysis catheter.

  7. The healing hand.

    Science.gov (United States)

    Cohen, Michael B

    2012-10-01

    The White Coat Ceremony was introduced by the Arnold P. Gold Foundation (http://www.humanism-in-medicine.org/index.php/programs_grants/gold_foundation_programs/white_coat_ceremony) at the Columbia University College of Physicians and Surgeons in 1993; it was established at the University of Iowa in 1995. The Gold Foundation is focused on making humanism a much higher priority among physicians, and medical students in particular, by reestablishing the notion of the caring physician. It includes several core attributes, "I.E., C.A.R.E.S.": Integrity, Excellence, Compassion, Altruism, Respect, Empathy, and Service. The White Coat Ceremony is but one of several programs run by the Foundation, which includes the Leonard Tow Humanism in Medicine Awards and the Gold Humanism Honor Society. In 2008, this journal introduced a "Humanities in Pathology" section. Since then, there have been relatively few articles published in this vein. What follows is a keynote address delivered at the White Coat Ceremony at The University of Iowa on August 19, 2011. At their core, pathologists are physicians, and we must not lose sight of our humanity!

  8. Ultrasound in evaluation of post-interventional femoral vein obstruction: a case report

    Directory of Open Access Journals (Sweden)

    Gerdts Eva

    2009-03-01

    Full Text Available Abstract Ultrasound is the preferred imaging modality in diagnosis of vascular complications following cardiac catheterization and intervention. In some cases, however, bleeding surrounding the femoral vessels, may severely distort the color Doppler images, making detection of venous complications especially difficult. This report refers to such a case where post-catheterization haematoma was suspected to cause an obstruction of the femoral vein. Spectral Doppler recordings of blood flow in the common femoral vein, up-stream, distal to the hemorrhagic area, confirmed the diagnosis of obstruction by demonstrating changes in the venous flow pattern in the common femoral vein, consistent with venous hypertension. Due to the poor quality of the ultrasound images, the exact cause of the obstruction had to be established by another imaging modality, not affected by haemorrhages. CT showed that the common femoral vein was compressed at the puncture site by surrounding haemorrhages. Thus, when bleeding due to cardiac catheterization is associated with possible venous obstruction and findings by color Doppler are equivocal due to degradation of the color-Doppler image, detection of venous hypertension by spectral Doppler, performed distal to the bleeding area, strongly supports the presence of venous obstruction where the exact cause may be established by CT.

  9. Multimodal biometric method that combines veins, prints, and shape of a finger

    Science.gov (United States)

    Kang, Byung Jun; Park, Kang Ryoung; Yoo, Jang-Hee; Kim, Jeong Nyeo

    2011-01-01

    Multimodal biometrics provides high recognition accuracy and population coverage by using various biometric features. A single finger contains finger veins, fingerprints, and finger geometry features; by using multimodal biometrics, information on these multiple features can be simultaneously obtained in a short time and their fusion can outperform the use of a single feature. This paper proposes a new finger recognition method based on the score-level fusion of finger veins, fingerprints, and finger geometry features. This research is novel in the following four ways. First, the performances of the finger-vein and fingerprint recognition are improved by using a method based on a local derivative pattern. Second, the accuracy of the finger geometry recognition is greatly increased by combining a Fourier descriptor with principal component analysis. Third, a fuzzy score normalization method is introduced; its performance is better than the conventional Z-score normalization method. Fourth, finger-vein, fingerprint, and finger geometry recognitions are combined by using three support vector machines and a weighted SUM rule. Experimental results showed that the equal error rate of the proposed method was 0.254%, which was lower than those of the other methods.

  10. Hand chemical burns.

    Science.gov (United States)

    Robinson, Elliot P; Chhabra, A Bobby

    2015-03-01

    There is a vast and ever-expanding variety of potentially harmful chemicals in the military, industrial, and domestic landscape. Chemical burns make up a small proportion of all skin burns, yet they can cause substantial morbidity and mortality. Additionally, the hand and upper extremity are the most frequently involved parts of the body in chemical burns, and therefore these injuries may lead to severe temporary or permanent loss of function. Despite this fact, discussion of the care of these injuries is sparse in the hand surgery literature. Although most chemical burns require only first response and wound care, some require the attention of a specialist for surgical debridement and, occasionally, skin coverage and reconstruction. Exposure to certain chemicals carries the risk of substantial systemic toxicity and even mortality. Understanding the difference between thermal and chemical burns, as well as special considerations for specific compounds, will improve patient treatment outcomes.

  11. Alien Hand Syndrome.

    Science.gov (United States)

    Hassan, Anhar; Josephs, Keith A

    2016-08-01

    Alien hand syndrome (AHS) is a rare disorder of involuntary limb movement together with a sense of loss of limb ownership. It most commonly affects the hand, but can occur in the leg. The anterior (frontal, callosal) and posterior variants are recognized, with distinguishing clinical features and anatomical lesions. Initial descriptions were attributed to stroke and neurosurgical operations, but neurodegenerative causes are now recognized as most common. Structural and functional imaging and clinical studies have implicated the supplementary motor area, pre-supplementary motor area, and their network connections in the frontal variant of AHS, and the inferior parietal lobule and connections in the posterior variant. Several theories are proposed to explain the pathophysiology. Herein, we review the literature to update advances in the understanding of the classification, pathophysiology, etiology, and treatment of AHS.

  12. Tying the Manager's Hands

    DEFF Research Database (Denmark)

    Foss, Kirsten; Foss, Nicolai Juul; Vázquez-Vicente, Xosé H.

    2003-01-01

    AbstractWe discuss and empirically examine a firm-level equivalent of the ancient problem of `tying the King's hands,' namely how to maximize managerial intervention for `good cause,' while avoiding intervention for `bad cause.' Managers may opportunistically intervene when such intervention...... produces private benefits. Overall firm performance is harmed as a result, because opportunistic managerial intervention harms employee motivation. The central point of the paper is that various mechanisms and factors, such as managers staking their personal reputation, employees controlling important...

  13. Pediatric hand treadmill injuries.

    Science.gov (United States)

    Banever, Gregory T; Moriarty, Kevin P; Sachs, Barry F; Courtney, Richard A; Konefal, Stanley H; Barbeau, Lori

    2003-07-01

    The great popularity of physical fitness in modern society has brought many pieces of exercise equipment into our homes for convenience and privacy. This trend has come with an increasing rate of injuries to children who curiously touch moving parts, including treadmill belts. Experience with a recent series of treadmill contact burns to children's hands is described in this article. A retrospective chart review at a tertiary referral center from June 1998 until June 2001 found six children sustaining hand burns from treadmills. The patients' ages at presentation ranged from 15 to 45 months (average of 31 months, three boys and three girls). All injuries occurred in the home while a parent was using the treadmill. Burns involved the palmar aspect of the hand, mostly confined to the fingers, and the severity ranged from partialto full-thickness burns. All patients were initially managed with collagenase and bacitracin zinc/polymyxin B powder dressings to second- and third-degree burns, along with splinting and range-of-motion exercises. Two patients required skin grafting at 2 weeks and 2 months for full-thickness tissue loss and tight joint contracture, respectively. At an average follow-up of 12 months, all patients had full range of motion and no physical limitation. The rate of children injured by exercise equipment is expected to increase. Friction burns to the hands remain a concern, although early recognition and appropriate management are associated with excellent functional outcomes. Protective modification of exercise machines seems to be the best approach to eliminating these injuries.

  14. Hand Hygiene Saves Lives

    Medline Plus

    Full Text Available ... Vital Signs Vital Signs – Presión Arterial Alta Other Languages Arabic احصل على التطعيم لتجنب الحصبة French Faites- ... captioning. Videos are prepared for different audiences including, children, parents, and public health professionals. More > Hand Hygiene ...

  15. Compact Dexterous Robotic Hand

    Science.gov (United States)

    Lovchik, Christopher Scott (Inventor); Diftler, Myron A. (Inventor)

    2001-01-01

    A compact robotic hand includes a palm housing, a wrist section, and a forearm section. The palm housing supports a plurality of fingers and one or more movable palm members that cooperate with the fingers to grasp and/or release an object. Each flexible finger comprises a plurality of hingedly connected segments, including a proximal segment pivotally connected to the palm housing. The proximal finger segment includes at least one groove defining first and second cam surfaces for engagement with a cable. A plurality of lead screw assemblies each carried by the palm housing are supplied with power from a flexible shaft rotated by an actuator and output linear motion to a cable move a finger. The cable is secured within a respective groove and enables each finger to move between an opened and closed position. A decoupling assembly pivotally connected to a proximal finger segment enables a cable connected thereto to control movement of an intermediate and distal finger segment independent of movement of the proximal finger segment. The dexterous robotic hand closely resembles the function of a human hand yet is light weight and capable of grasping both heavy and light objects with a high degree of precision.

  16. Quantification of deep medullary veins at 7 T brain MRI

    Energy Technology Data Exchange (ETDEWEB)

    Kuijf, Hugo J.; Viergever, Max A.; Vincken, Koen L. [University Medical Center Utrecht, Image Sciences Institute, Utrecht (Netherlands); Bouvy, Willem H.; Razoux Schultz, Tom B.; Biessels, Geert Jan [University Medical Center Utrecht, Department of Neurology, Brain Center Rudolf Magnus, Utrecht (Netherlands); Zwanenburg, Jaco J.M. [University Medical Center Utrecht, Image Sciences Institute, Utrecht (Netherlands); University Medical Center Utrecht, Department of Radiology, Utrecht (Netherlands)

    2016-10-15

    Deep medullary veins support the venous drainage of the brain and may display abnormalities in the context of different cerebrovascular diseases. We present and evaluate a method to automatically detect and quantify deep medullary veins at 7 T. Five participants were scanned twice, to assess the robustness and reproducibility of manual and automated vein detection. Additionally, the method was evaluated on 24 participants to demonstrate its application. Deep medullary veins were assessed within an automatically created region-of-interest around the lateral ventricles, defined such that all veins must intersect it. A combination of vesselness, tubular tracking, and hysteresis thresholding located individual veins, which were quantified by counting and computing (3-D) density maps. Visual assessment was time-consuming (2 h/scan), with an intra-/inter-observer agreement on absolute vein count of ICC = 0.76 and 0.60, respectively. The automated vein detection showed excellent inter-scan reproducibility before (ICC = 0.79) and after (ICC = 0.88) visually censoring false positives. It had a positive predictive value of 71.6 %. Imaging at 7 T allows visualization and quantification of deep medullary veins. The presented method offers fast and reliable automated assessment of deep medullary veins. (orig.)

  17. Abdominal thromboses of splanchnic, renal and ovarian veins.

    Science.gov (United States)

    De Stefano, Valerio; Martinelli, Ida

    2012-09-01

    Thromboses of abdominal veins outside the iliac-caval axis are rare but clinically relevant. Early deaths after splanchnic vein thrombosis occur in 5-30% of cases. Sequelae can be liver failure or bowel infarction after splanchnic vein thrombosis, renal insufficiency after renal vein thrombosis, ovarian infarction after ovarian vein thrombosis. Local cancer or infections are rare in Budd-Chiari syndrome, and common for other sites. Inherited thrombophilia is detected in 30-50% of patients. Myeloproliferative neoplasms are the main cause of splanchnic vein thrombosis: 20-50% of patients have an overt myeloproliferative neoplasm and/or carry the molecular marker JAK2 V617F. Renal vein thrombosis is closely related to nephrotic syndrome; finally, ovarian vein thrombosis can complicate puerperium. Heparin is used for acute treatment, sometimes in conjunction with systemic or local thrombolysis. Vitamin K-antagonists are recommended for 3-6 months, and long-term in patients with Budd-Chiari syndrome, unprovoked splanchnic vein thrombosis, or renal vein thrombosis with a permanent prothrombotic state such as nephrotic syndrome.

  18. Development of HIFU Therapy System for Lower Extremity Varicose Veins

    Science.gov (United States)

    Ota, Ryuhei; Suzuki, Jun; Yoshinaka, Kiyoshi; Deguchi, Juno; Takagi, Shu; Miyata, Tetsuro; Matsumoto, Yoichiro

    2009-04-01

    High-intensity focused ultrasound (HIFU) treatment utilizing microbubbles was investigated in the present study. It is known that microbubbles have the potential to enhance the heating effects of an ultrasound field. In this study, the heat accompanying microbubble oscillation was used to occlude varicose veins. Alteration of veins was observed after ultrasound irradiation. Veins were resected by stripping. In this study, two vein conditions were adopted during HIFU irradiation; non-compressed and compressed. Compressing the vein was expected to improve occlusion by rubbing the altered intima under compressed conditions. The frequency of the ultrasound was 1.7 MHz, the intensity at the focus was 2800 W/cm2, and the irradiation time was 20 s. In this study, the contrast agent Levovist® was chosen as a microbubble source, and the void fraction (ratio of total gas volume to liquid) in the vein was fixed at 10-5. Under non-compressed conditions, changes were observed only at the adventitia of the vein anterior wall. In contrast, under compressed conditions, changes were observed from the intima to the adventitia of both the anterior and posterior walls, and they were partly stuck together. In addition, more experiments with hematoxylin-eosin staining suggested that the changes in the vein were more substantial under the latter conditions. From these results, it was confirmed that the vein was occluded more easily with vein compression.

  19. [Costs of hand emergencies].

    Science.gov (United States)

    Raimbeau, G

    2003-10-01

    In France at the present time, there is no comprehensive registry of hand injuries. Three types of occurrences; motor vehicle accidents, work accidents, and accidents incident to activities of daily living, are covered by different types of insurance. It is the individual insurance companies, payers of the indemnification, who maintain registries of these accidents. Statistics on work accidents are very detailed and consistent, but they are oriented toward risk management. The aggregate cost of traumatic injuries to the hand is not known. Only large financial institutions are equipped to determine appropriate preventive measures and to establish premium rates based on loss experience. In 2001, hand injuries accounted for 27% of work accidents causing loss of work of at least 1 day. About 29.8% of these work accidents caused permanent partial impairment. About 17.7% of total days lost and 18.2% of the total costs of permanent impairment were due to hand injuries. In the system of compensation for work accidents, there is a major difference in the cost according to the severity of the impairment. If the permanent impairment is equal to or less than 9%, a lump sum payment is made, but if the permanent impairment is over 9%, the worker receives regular payments for the rest of his life. In 2000, the average cost of a work injury with partial permanent impairment of over 9% was [symbol: see text] 85,405, while the average cost of a lump sum settlement was only [symbol: see text] 1479, a ratio of 57 to 1. The compensation costs represent 80% of the cost of work accidents, while the cost of treatment, including all providers and institutions, makes up only 20% of the cost. Compensation for sequelae of accidents in the course of daily life is new for the insurance companies, although these accidents are frequent and often cause significant repercussions in the professional lives of victims because of the loss of hand function. Provision of optimal treatment for these

  20. Computed tomographic evaluation of the portal vein in the hepatomas

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Kee Hyung; Lee, Seung Chul; Bae, Man Gil; Seo, Heung Suk; Kim, Soon Yong; Lee, Min Ho; Kee, Choon Suhk; Park, Kyung Nam [Hanyang University College of Medicine, Seoul (Korea, Republic of)

    1986-10-15

    Computed tomography and pornographic findings of 63 patients with hepatoma, undergone hepatic angiography and superior mesenteric pornography for evaluation of tumor and thrombosis of portal vein and determination of indication of transcatheter arterial embolization for palliative treatment of hepatoma from April, 85 to June, 86 in Hanyang university hospital, were reviewed. The results were as follows: 1. In 36 cases, portal vein thrombosis was detected during photography. Nineteen of 37 cases which revealed localized hepatoma in the right lobe of the liver showed portal vein thrombosis; 9 of 11 cases of the left lobe; 8 of 14 cases which were involved in entire liver revealed thrombosis. One case localized in the caudate lobe showed no evidence of invasion to portal vein. 2. Twenty-four of 34 cases with diffuse infiltrative hepatoma revealed portal vein thrombosis and the incidence of portal vein thrombosis in this type were higher than in the cases of the nodular type. 3. The portal vein thrombosis appeared as filling defects of low density in the lumen of the portal veins in CT and they did not reveal contrast enhancement. 4. CT revealed well the evidence of obstructions in the cases of portal vein thrombosis and the findings were well-corresponded to the findings of the superior mesenteric photography. 5. Five of the cases of the portal vein thrombosis were missed in the CT and the causes were considered as due to partial volume effect of enhanced portal vein with partial occlusion or arterioportal shunts. 6. Six of 13 cases with occlusion of main portal vein showed cavernous transformation and they were noted as multiple small enhanced vascularities around the porta hepatis in the CT. According to the results, we conclude that CT is a useful modality to detect the changes of the portal veins in the patients of the hepatoma.