Figure 4-8 The D-stereoisomer (closed squares) of the α2 -adrenergic agonist medetomidine causes a dose-dependent decrease in the halothane minimum alveolar concentration (MAC) in dogs, whereas the L-stereoisomer (open squares) has little or no influence on halothane MAC. Asterisks indicate values that are significantly different from the controls. (Adapted from Vickery RG, Sheridan BC, Segal IS, et al: Anesthetic and hemodynamic effects of the stereoisomers of medetomidine, an α2 -adrenergic agonist, in halothane-anesthetized dogs. Anesth Analg 67:611, 1988.)


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