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The Effects of Anesthetic Agents and Techniques on Canine Cerebral ATP and Lactate Levels

Cerebral ATP, lactate, and pyruvate were measured in 64 dogs during seven anesthetic circumstances. In the presence of anesthetic agents associated with even twofold differences in cerebral oxygen consumption (CMRo2), there were no differences in cerebral ATP and lactate levels or lactate-pyruvate ratios. Similar values were observed after induction of hypothermia (30 C). However, in dogs made hypocapnic (Paco2 = 10 mm Hg), a threefold increase in cerebral lactate content and a significant reduction in cerebral ATP content (5 per cent) were observed. In hypocapnic, anemic dogs (Hb = 5.0 gm/100 ml), a greater reduction in cerebral ATP content (12 per cent) was observed. EEG's of all dogs were active. The EEG's of hypocapnic dogs could not be distinguished from those of hypocapnic, anemic dogs. The increases in cerebral lactate content induced by hypocapnia were not associated with increased differences between lactate levels in arterial and sagittal sinus blood.