title: The effect of spontaneous versus controlled ventilation on the rate of rise of alveolar halothane concentration in dogs.
abstract: The rate of rise of the alveolar:inspired halothane concentration (F delta/F1) ratio was measured in dogs breathing spontaneously. These rates were measured at inspired concentrations of 0.3, 1.5, and 4 percent. Initially, FON (FA/F1) ratio was measured in dogs breathing spontaneously. These rates were measured at inspired concentrations of 0.3, 1.5, and 4 percent. Initially FA/F1 rose at similar rates for all 3 concentrations, but a 4 percent, the plateau attained was lower as a result of respiratory depression. In a 2nd group of dogs, FA/FI was measured for inspired concentrations of 0.3, 1.5, 4, and 6 percent during controlled ventilation. FA/FI rose at similar rates at the lower 2 concentrations but at progressively more rapid rates at inspired concentrations of 4 and 6 percent, presumably as a result of circulatory depression.
mesh_terms: D000818:Animals; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D006221:Halothane / Q000008:administration & dosage / Q000378:metabolism*; D011650:Pulmonary Alveoli / Q000378:metabolism*; D012119:Respiration; D012121:Respiration, Artificial; D013997:Time Factors
chemical_list: D006221:Halothane