Abstract
Continuous on-line breath-by-breath measurement of pulmonary gas exchange was used to monitor the increase in oxygen uptake (VO2) and carbon dioxide excretion (VCO2) induced by the oxidative phosphorylation uncoupling agent 2, 4-dinitrophenol (DNP) in 10 dogs. With incremental doses of DNP totaling 5 mg/kg, the continuously monitored VO2 increased within 2-3 min after the first injection of the drug. VCO2 showed a similar response 4-6 min after the first injection. Temperature increase due to the pharmacological oxidative phosphorylation uncoupling required 20-30 min for a discernible change at this dose. This study also demonstrated a modified and compromised response to the drug in dogs where oxygen delivery was limited by mechanical ventilation.
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