An evaluation of the functional implications of the intestinal mucosal lesions in shock.

Small intestinal mucosal lesions are reported in clinical shock and are commonly found in experimental shock. Experimental series in which shock is induced by regional intestinal ischemia or IV infusion of live Escherichia coli in cats or by graded intestinal vascular occlusion in rats are described. In all series mucosal damage was related to pronounced hypotension or mortality. In the cat models myocardial dysfunction was demonstrated in vivo by IV volume load and recording of changes in left ventricular filling pressure as related to cardiac performance. Following intestinal ischemia in cats and intestinal vascular obstruction in rats the intestinal venous plasma was found to contain cardiotoxic factors when tested in vitro. It is proposed that the development of small intestinal mucosa lesions in shock tends to further aggravate hypotension by causing intestinal release of cardioinhibitory material.