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- W3146840984 abstract "We studied the cardiac effects of amantadine, an antiviral and anti-Parkinson drug. Amantadine hydrochloride (100--800 microM) produced significant changes in the electrophysiological properties of isolated ventricular muscle preparations from frog, rabbit, cat, dog, and calf. At relatively low concentrations (100--300 microM), the drug increased action potential duration, decreased action potential amplitude and maximum diastolic potential, and induced phase 4 depolarization. Amantadine also caused subthreshold diastolic depolarizations, apparent upon cessation of stimulation in all preparations studied. The amplitude of the diastolic depolarizations increased as a function of time and/or concentration of drug, eventually reached threshold, and spontaneous activity ensued. In the steady state, amantadine-induced spontaneous activity was rather stable, and the rate was dependent upon the amantadine and external potassium concentrations, as well as the membrane potential. In the absence of stimulation, ama..." @default.
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- W3146840984 date "1982-01-01" @default.
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- W3146840984 title "Amantadine-induced diastolic depolarization and automaticity in ventricular muscle." @default.
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