Sample records for OBSTRUCCION DE FLUJO (flow blockage)
from WorldWideScience.org

Sample records 1 - 4 shown.



1

SIGNO RADIOLÓGICO: LAS VALIOSAS PERLAS DEL INTESTINO DELGADO/ THE VALUABLE PEARLS OF THE SMALL INTESTINE

Zerega R, Mario; Cortés A, Claudio
2009-01-01

Resumen en español El signo del collar de perlas puede ser visto en radiografía simple de abdomen y en tomografía computada. Consiste en un conjunto de pequeñas burbujas dispuestas en forma longitudinal. Representan pequeños acúmulos de gas atrapados entre las válvulas conniventes de asas de intestino delgado dilatadas y predominantemente rellenas de líquido a lo largo de su pared no dependiente(1). Es considerado virtualmente diagnóstico de obstrucción intestinal, que ocurre cuand (mas) o existe un bloqueo intrínseco o extrínseco al flujo normal del contenido intestinal que se manifiesta con dolor abdominal, distensión, vómitos, borborigmos y bazuqueo. Es una enfermedad potencialmente letal que requiere ser resuelta en forma urgente. La duración de la obstrucción, la frecuencia de los vómitos, y la aspiración del contenido gástrico o enteral pueden afectar la apariencia radiográfica. Continúa siendo difícil de diagnosticar solamente con radiografía simple de abdomen. Aunque es poco frecuente, el signo del collar de perlas es muy valioso para el radiólogo, el clínico y el paciente Resumen en inglés The string of pearls sign can be seen in simple abdominal radiography and computed tomography as well. It consists of a row of small air bubbles longitudinally oriented in the abdomen. They represent small amounts of air trapped between val-vulae conniventes along the non dependent wall of predominantly fluid-filled, dilated small bowel loops. This sign is considered virtually diagnostic of small bowel obstruction, which occurs whenever there is an intrinsic or extrinsic (mas) blockage of the normal flow of bowel contentand manifests as abdominal pain, distention, vomiting, and increased high-pitched bowel sounds. It is a potentially Ufe threatening disease that requires urgent treatment. Duration of obstruction, vomiting frequency and gastric or enteric suction may affect radiographic appearance. It continues being hard to diagnose only based on simple radiography. Despite its low frequency, the string of pearls sign could be very valuable for radiologist, clinical physician and patient

Scientific Electronic Library Online (Spanish)

4

Actividad rítmica espontánea en vasos de placenta humana: ¿Un marcapaso fisiológico en los vasos sanguíneos?/ Spontaneous rhythmic contractions of human umbilical vessels, evidences for a physiological pacemaker in blood vessels?

Huidobro-Toro, Juan Pablo G; González C, Rolando; Varas F, José Alejandro; Rahmer O, Alejandro; González A, Rolando
2001-10-01

Resumen en inglés Background: Placental vessels are not innervated. Therefore the vasomotor activity and vascular tone is not regulated by the nervous system. Aim: To assess the existence of pacemaker mechanisms related to rhythmic motor activity of blood vessels. Material and methods: Isometric contractions of rings from umbilical and chorionic vessels of term human placentas were monitored. Results: Recordings of the circular layer of chorionic and umbilical vessels revealed rhythmic spo (mas) ntaneous contractions with a frequency of 1,4±0,05 cycles/min, the duration of each cycle was 42,8±0,24 s (n=12). The amplitude of contractions was larger in veins than in arteries, predominating in umbilical vein biopsies, proximal to the fetus. Both the frequency and the amplitude of contractions were relatively constant during the first 30 min. However, after an hour, the frequency declined while the amplitude increased. The absence of the endothelium neither modified the frequency nor the amplitude of the rhythmic activity. Blockage of voltage dependent sodium channels or calcium channels did not alter the frequency of spontaneous contractions, although their magnitude was reduced. Glibenclamide, an ATP-dependent K+ channel blocker or the blockade of gap junctions ablated the frequency and amplitude of spontaneous contractions. Conclusions: We propose that rhythmic contractions are triggered by pacemaker cells located in the circular layer of the smooth muscle of blood vessels and spread via gap junctions; they likely contribute to the control of blood flow (Rev Méd Chile 2001; 129: 1105-12)

Scientific Electronic Library Online (Spanish)