Mizonishi T, Semba T
Jpn J Physiol. 1979;29(5):627-33. doi: 10.2170/jjphysiol.29.627.
Arterial and venous blood flow and oxygen saturation of the venous blood in the mesenteric vessels arising from single mesenteric artery and vein to the intestinal loop in anesthetized dogs were measured simultaneously with systemic arterial blood pressure during distension of this loop. Mesenteric arterial blood flow decreased to the zero level, while mesenteric venous outflow increased to about twice the quiescent level at the onset of elevation of intraluminal pressure. However, during distension, the decreased arterial blood flow tended to increase, but the increased venous flow was reduced to one half of the quiescent level. Oxygen saturation of venous blood diminished initially and then increased progressively during distension. At the end of distension venous outflow stopped temporarily. After suspension of distension, arterial and venous flow and oxygen saturation increased beyond the quiescent level. These results may suggest that there is a by-pass or A-V anastomosis which cannot be compressed mechanically by elevation of intraluminal pressure.
在麻醉犬的肠袢扩张过程中，同时测量由单一肠系膜动脉和静脉发出至该肠袢的肠系膜血管内的动脉和静脉血流以及静脉血的氧饱和度，并与体循环动脉血压进行对比。肠腔内压力升高开始时，肠系膜动脉血流降至零水平，而肠系膜静脉流出量增加至静息水平的约两倍。然而，在扩张过程中，减少的动脉血流趋于增加，但增加的静脉血流减少至静息水平的一半。静脉血的氧饱和度最初降低，然后在扩张过程中逐渐升高。在扩张结束时，静脉流出量暂时停止。扩张停止后，动脉和静脉血流以及氧饱和度增加至超过静息水平。这些结果可能提示存在一个旁路或动静脉吻合支，其不会因肠腔内压力升高而被机械性压迫。
