Authors: SD Beder MH Cohen G BenShachar
Publish Date: 2014/04/08
Volume: 19, Issue: 3, Pages: 204-211
Abstract
This investigation sought to study single dose pharmacokinetics of amiodarone in a chronic animal model We developed a new chronic animal model that allows serial direct access to the heart of the immature piglet via an implanted acrylic thoracic window Following instrumentation and 72hour recovery amiodarone 5 mg/kg was administered as a single intravenous bolus in immature piglets Timed paired serum samples and myocardial biopsies for amiodarone level were obtained prior to and up to 72 hours following amiodarone administration Peak concentrations of amiodarone in both serum 360 ± 102 μg/ml and tissue 842 ± 650 ng/mg occurred within 5 minutes of drug administration As reported by others this study demonstrated that the volume of distribution VD of amiodarone was large 3331 ± 3521 L/kg and the clearance Cl was low 136 ± 44 ml/min/kg Marked prolongation of both the serum t 1/2 2998 ± 2926 hours and the myocardial t 1/2 2920 ± 2949 hours were noted as well The early rapid myocardial peak of amiodarone in the immature myocardium corresponds with recent clinical observations of onset of antiarrhythmic efficacy 5 to 10 minutes following intravenous amiodarone administration in young children
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