Mesure du débit du sang de la veine porte au moyen d'un débitmètre électromagnétique chez la chèvre

Abstract

Summary. Measurement of portal vein blood flow in goats using an electromagnetic flow- meter. When quantitatively measuring the products of digestion in the portal blood, the following factors are to be studied : - the difference between the concentrations of those products in the arterial blood affe- rent to the alimentary canal and of those in the venous portal blood, - blood flow in the portal vein. As a preliminary step, we have undertaken the study of the continuous measurement of the portal blood flow in ruminants (goats), using a method analogous to that employed by Rérat in pigs. Nine goats were fitted with a ring-probe around the portal vein ; during reading, the probe was attached to an electromagnetic flow-meter connected to a recor-der. Fifteen readings were taken on 4 of the animals (mean live weight : 47 kg) for about 7 hours after the morning feeding. After installation, each gauge allowed readings for 4 to 5 consecutive weeks. The signal then faded, and the animals were slaughtered and exami- ned. As the wall of the portal vein had slightly thickened and therefore its lumen was only slightly reduced, signal damping could be attributed to a change in probe functio- ning. The mean flow, measured at the time of reading, was 1 830 ml/min or 39 ml/min/kg of live weight. This study showed a large variability in the flow and distinguished 3 variations throughout the day :