Abstract
An evaluation of the effect of ischaemia upon the intraluminal pH of microvascular free jejunal autografts was undertaken with a view to developing a monitoring system to be used clinically. Employing a canine model, the intraluminal pH of isolated jejunal segments was measured during normal perfusion and under conditions of arterial and venous occlusion. Ischaemia induced a rapid, easily measured fall in intraluminal pH reversible after 1 h of normothermic ischaemia. The most rapid pH change occurred within the first 10 min. It is felt that continuous intraluminal pH measurement may form a reliable method of monitoring the postoperative vascular perfusion of clinical free jejunal transfers.
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