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. 1987 Jun;205(6):597–612. doi: 10.1097/00000658-198706000-00001

The fundamental hemodynamic mechanism underlying gastric "stress ulceration" in cardiogenic shock.

R W Bailey, G B Bulkley, S R Hamilton, J B Morris, U H Haglund, J E Meilahn
PMCID: PMC1493091  PMID: 3592803

Abstract

Acute hemorrhagic ulceration of the gastric mucosa is seen frequently in patients with hypovolemic or cardiogenic shock. Although such lesions clearly are related to regional gastric ischemia, little attention has been directed at the underlying mechanism(s) mediating the ischemia itself. To this end, anesthetized pigs were subjected to sustained cardiogenic shock (mild hemorrhage and pericardial tamponade) such that cardiac output was reduced to 38 +/- 1% of the baseline level for 4 hours, followed by release of the tamponade, reinfusion of the shed blood, and resuscitation for 2 hours. During the period of shock, there was profound regional gastric ischemia, resulting from severe and disproportionate gastric vasoconstriction. "Blinded" gross and microscopic evaluation of the stomachs removed after the experiment revealed severe mucosal ischemic necrosis, hemorrhage, and ulceration, whereas sham-operated pigs showed no lesions. The characteristics of this model therefore mimic the essential features of the gastric "stress ulceration" syndrome. Prior confirmed total alpha-adrenergic blockade with phenoxybenzamine failed to alter these features significantly. In contrast, prior ablation of the renin-angiotensin axis, whether by angiotensin-converting enzyme inhibition with teprotide or by bilateral nephrectomy, significantly and substantially ameliorated the ischemia, vasospasm, and mucosal injury. In this model of cardiogenic shock, acute gastric mucosal "stress ulceration" is caused by a disproportionately severe regional gastric ischemia resulting from selective splanchnic vasospasm that is unaffected by sympathetic blockade but abolished by prior ablation of the renin-angiotensin axis. Like nonocclusive small bowel ischemia, ischemic colitis, and the "shock liver" syndrome, gastric "stress ulceration" is yet another component of the multiple splanchnic organ failure syndrome that appears to be mediated primarily by the remarkable sensitivity of the splanchnic vascular bed to the renin-angiotensin axis.

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601Figs. 2A and B.
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603Figs. 4A-E.
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604Figs. 4A-E.
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605Fig. 4 (Continued).
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