Halothane markedly reduces mesenteric blood flow but does not impair gut mucosal oxygenation in pigs.
We investigated the effect of halothane on in mesenteric blood flow and gut mucosal oxygenation. Pittman-Moore mini-pigs (n = 6) were chronically instrumented with aortic, pulmonary arterial (Swan-Ganz), and mesenteric venous catheters and an intestinal tonometer. Blood flow in the superior mesenteric artery was measured with an ultrasonic flow probe. On the day of the experiment, data were obtained before and during halothane administration (1.5% end-tidal). Halothane caused a marked decrease in mesenteric blood flow, associated with an increase in mesenteric vascular resistance. Likewise mesenteric oxygen delivery and consumption were significantly decreased under halothane, while the oxygen extraction rate of the intestine was not significantly changed. There was no significant change in intramucosal gut pH after halothane administration, which indicates that an adequate mucosal tissue oxygenation was maintained. We conclude that the marked halothane-induced reduction in mesenteric blood flow did not seem to impair the oxygenation of the gut mucosa in our experimental model.
Loick
H M
HM
Department of Anesthesiology, University of Texas Medical Branch, Galveston.
Tokyay
R
R
Abdi
S
S
Traber
D L
DL
Nichols
R J
RJ
Herndon
D L
DL
D000818:Animals; D001783:Blood Flow Velocity / Q000187:drug effects / Q000502:physiology; D001794:Blood Pressure / Q000187:drug effects; D002302:Cardiac Output / Q000187:drug effects / Q000502:physiology; D006221:Halothane / Q000008:administration & dosage / Q000494:pharmacology*; D006439:Hemodynamics / Q000187:drug effects; D006863:Hydrogen-Ion Concentration; D007413:Intestinal Mucosa / Q000187:drug effects* / Q000378:metabolism; D010100:Oxygen / Q000097:blood / Q000378:metabolism*; D010101:Oxygen Consumption / Q000187:drug effects; D013152:Splanchnic Circulation / Q000187:drug effects* / Q000502:physiology; D013552:Swine; D013556:Swine, Miniature; D014655:Vascular Resistance / Q000187:drug effects
D010100:Oxygen; D006221:Halothane