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Abstract
The role of serotonin, catecholamines, and angiotensin in the pathogenesis of mesenteric
low flow states was investigated in anesthetized dogs by measurement of blood flows
with electromagnetic.flow meters. During dehydration or cardiac tamponade, a disproportionate
decrease in superior mesenteric artery flow was demonstrated, compared with aortic,
flow, but renal artery flow was relatively better maintained. Depletion of serotonin
and catecholamines by pretreatment with reserpine or blocking serotonin's action with
methysergide did not alter the disproportionate reduction in mesenteric, flow. Disproportionate
superior mesenteric artery flow during dehydration and tamponade was associated with
increased levels of circulating angiotensin and virtually was abolished by bilateral
nephrectomy, by inhibition of enzymatic conversion of angiotensin I to II by Bothrops
nonapeptide, and by competitive inhibition of angiotensin II with 1-sar, 8-ala angiotensin
II. Exogenous angiotensin administered intravenously to dogs not protected by drug
treatment disproportionately decreased superior mesenteric artery, flow with less
effect on renal artery flow. These results are compatible with the hypothesis that
increased circulating levels of angiotensin during dehydration and tamponade contribute
to the disproportionate reduction in superior mesenteric artery flow in the anesthetized
dog.
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Article info
Publication history
Accepted:
October 6,
1975
Footnotes
☆Presented in part at a meeting of the American College of Surgeons, San Francisco, Calif., October, 1975, and published in abbreviated form, Surg. Forum 26: 295, 1975.
☆Supported by Program Project in Thrombosis, Grant No. 11414 from the National Institutes of Health.
Identification
Copyright
© 1976 Published by Elsevier Inc.