TY - JOUR T1 - Pharmacokinetic-Pharmacodynamic Characterization of the Cardiovascular, Hypnotic, EEG and Ventilatory Responses to Dexmedetomidine in the Rat JF - Journal of Pharmacology and Experimental Therapeutics JO - J Pharmacol Exp Ther SP - 1051 LP - 1058 VL - 283 IS - 3 AU - Cornelis J.J.G. Bol AU - Meindert Danhof AU - Donald R. Stanski AU - Jaap W. Mandema Y1 - 1997/12/01 UR - http://jpet.aspetjournals.org/content/283/3/1051.abstract N2 - This study characterizes the pharmacokinetic-pharmacodynamic (PK-PD) relationships of the cardiovascular, EEG, hypnotic and ventilatory effects of the alpha-2 adrenergic agonist dexmedetomidine in rats. Dexmedetomidine was administered by a single rapid infusion (n = 6) and by an infusion regimen of gradually increasing rate (n = 8). HR, mean arterial pressure (MAP) and EEG signals were recorded continuously, as was the time at which the rats woke up spontaneously from drug-induced sleep, a measure of hypnosis. Arterial concentrations of dexmedetomidine and blood gases were determined regularly. A sigmoidal Emaxmodel was used to describe the HR, MAP and EEG concentration-effect relationships, with the EEG effect (activity in 0.5–3.5-Hz frequency band) linked to an effect-site model. The PK of dexmedetomidine could be described by a two-compartment model, with similar PK parameters for both infusion regimens. Plasma protein binding was 84.1[0.7]%. Because of complex cardiovascular homeostatic reflex mechanisms, HR and MAP could only be analyzed during gradually increasing infusions. The maximal decrease in HR was 35(2)%, and the maximal increase in MAP was 37(2)%. For both infusion regimens, similar PD parameters were found for the EEG and the hypnotic measure. These data suggest the absence of active metabolites or tolerance of the EEG and hypnotic effects. Judging on the basis of concentrations of dexmedetomidine (mean (S.E.M.)), HR decrease was the most sensitive response [EC50 of 0.65(0.09) ng/ml], followed by increase in MAP [EC50 of 2.01(0.14) ng/ml], change in EEG activity [EC50 of 2.24(0.16) ng/ml] and the hypnotic measure [Cwake-up of 2.64(0.10) ng/ml]. Ventilatory effects were minor. The American Society for Pharmacology and Experimental Therapeutics ER -