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The literature regarding the effect of nicotine and cigarette smoke on gastric blood flow is conflicting. The hydrogen gas clearance technique was used to measure the effects of nicotine and cigarette smoke on basal gastric mucosal blood flow in anesthetized rats. Blood flow was measured before, during, and after treatment with either intravenous nicotine (4 or 40 micrograms/kg/min) or inhaled cigarette smoke (nicotine or nicotine free). Neither intravenous nicotine nor cigarette smoke significantly altered gastric mucosal blood flow. On the other hand, hypotension produced by hemorrhage significantly decreased mucosal blood flow (P less than 0.05). Thus the technique used could detect a decrease in blood flow. These findings indicate that in the anesthetized rats, hypotension but not intravenous nicotine or cigarette smoke, in the doses given, reduce gastric mucosal blood flow.

Nicotine and smoking do not decrease basal gastric mucosal blood flow in anesthetized rats