Sample records for bronchospirometry

  1. Dynamic lung transmission studies

    International Nuclear Information System (INIS)

    The aim of this study was to develop a non-invasive method for determining regional lungvolumes, which could replace bronchospirometry in routine clinical use. Transmission through the thorax of sup(99m)Tc-gammarays is measured by means of a gamma camera on line with a computer. The technique of measurement and data analysis is described and tested in several series of phantom studies. The results proved to be good: the mean difference with the real volumes was -4%. The error varied between -10% and +1. Transmission studies and bronchospirometry are compared in a group of 11 patients and there proved to be a good correspondence between the results of these methods. It is concluded that transmission experiments can determine the vital capacity of both lungs as a whole as accurately as spirometry and allows the measurement of vital capacity for each lung separately with the same accuracy as bronchospirometry. (Auth.)

  2. Perfusion pulmonary radio-isotope scan using MA I131 and separate spirographic measurement of each lung. Trial of interpretation in discrepant results

    International Nuclear Information System (INIS)

    The comparison of the results of perfusion pulmonary radio-isotope scanning, using MA I131 and separate bronchospirometry of each lung, in 42 patients with chronic lung disease, showed definite discrepancy in more than 50% of cases. The discrepancies noted are due to the procedure of radioisotope scanning itself, which correspond to the static recording of fixation of macroaggregates blocked in the pulmonary pre-capillaries. They are injected at rest under stable thermodynamic conditions and, instantaneously and preferentially, pass towards the side with the least pressure, i.e. the healthy side. On several occasions, as in this case, a slight increase in arterial pressure in the main mulmonary artery of the deficient lung was noted. This balance may explain the relative failure of scintiscanning as shown by lesser uptake in the diseased lung. Separate bronchospirometry, on the other hand, remains a more dynamic investigation which may be continued under hemodynamic conditions which are subject to variations. It also permits, by a quantitatively precise oxygen consumption, assessment without any error of the relative perfusion of each lung. In conclusion, in functional assessment and, even more, in the diagnosis of operability, lung perfusion scanning does not give information as precise as separate bronchospirometry

  3. Prediction of postoperative lung function after pulmonary resection

    International Nuclear Information System (INIS)

    Lung scintigraphy and ordinary lung function test as well as split lung function test by using bronchospirometry was performed in 78 patients with primary lung cancer and clinical significance of ventilation and perfusion scintigraphy was evaluated. Results obtained from this study are as follows. 1) The ratio of right VC to total VC obtained by preoperative bronchospirometry was well correlated to the ratio of right lung count to the total lung count obtained by ventiration and/or perfusion scintigraphy (r = 0.84, r = 0.69). 2) Evaluation of the data obtained from the patients undergoing pneumonectomy indicated that the right and left VC obtained preoperatively by bronchospirometry have their clinical significance only in the form of left to right ratio not in the form their absolure value. 3) As to the reliability of predicting the residual vital capacity after pneumonectomy on the basis of left-to-right of lung scintigraphy, ventilation scintigraphy is more reliable than perfusion scintigraphy. 4) Irrespective of using ventilation scintigraphy or perfusion scintigraphy, Ali's formular showed high reliability in predicting the residual vital capacity as well as FEV1.0 after lobectomy. 5) Reduction of the perfusion rate in the operated side of the lung is more marked than of the ventilation rate, resulting in a significant elevation of ventilation/perfusion ratio of the operated side of the lung. From the results descrived above, it can be said that lung ventilation and perfusion scintigraphy are very useful method to predict the residual lung function as well as the change of ventilation/perfusion ratio after pulmonary resection. (author)