Gastric mucosal microcirculation and purine nucleotide metabolism after retransfusion of rats in hemorrhagic shock.

Abstract

Gastric mucosal microcirculation and purine nucleotide metabolism were studied after hemorrhagic shock and retransfusion in rats. The number of perfused microvessels and the concentration of adenosine triphosphate, adenosine monophosphate, inosine monophosphate, inosine, hypoxanthine, xanthine, and uric acid were investigated in mucosal biopsy specimens after 15 or 45 min of hemorrhagic shock and after 15 min of shock followed by 30 min of retransfusion. During shock a dephosphorylation of nucleotides and a decrease in the number of perfused microvessels occurred, the more the longer the duration of the shock period. Retransfusion led to an additional reduction in the number of perfused microvessels, but there was a partial restoration of high-energy phosphate metabolites in those areas of the mucosa which maintained a blood flow. The results indicate that there is a renewal of energy stores in gastric mucosa after hemorrhagic shock and reperfusion, although parts of the vascular bed are not reperfused.