Abstract
The effects of milrinone and pimobendan upon the initiation of programmed ventricular stimulation-induced ventricular tachycardia (VT) and the incidence of lethal ischemic ventricular arrhythmias were assessed in conscious dogs with recent anterior myocardial infarctions. Based upon the results of previous studies, the animals which were entered into this investigation were nonresponsive to baseline programmed stimulation and, therefore, considered to be at "low risk" toward the development of subsequent lethal ischemic arrhythmias. Milrinone (200 micrograms/kg/h continuous i.v. infusion) and pimobendan (300 micrograms/kg i.v.) were administered in dosing regimens shown to produce equivalent and sustained increases in left ventricular (LV) + dP/dt. At the time of repeat electrophysiologic testing, 9 of 9 pimobendan-, 9 of 10 milrinone-, and 12 of 12 concurrent vehicle-treated animals remained nonresponsive to programmed ventricular stimulation. Compared to a total control population of 39 "low risk" postinfarction dogs; however, both milrinone and pimobendan administration increased the incidence of sudden ventricular fibrillation occurring in response to the development of acute posterolateral ischemia (milrinone 4 of 10 [40%]...Continue Reading
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