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We used two experimental techniques to study the effect of lidocaine hydrochloride on the early inward transient (sodium) current as it is reflected by the maximum rate of change of action potential phase 0 (Vmax). We assessed the effect of lidocaine on Vmax as Purkinje fibers were slowly depolarized by increasing the extracellular potassium concentration(More)
We studied the effects of lidocaine (1-5 mg/liter) on the diastolic currents of sheep Purkinje fibers by the two-microelectrode voltage clamp technique to obtain additional information on how lidocaine decreases the slope of spontaneous diastolic depolarization of mammalian Purkinje fibers. During voltage clamps we measured both the magnitude and time(More)
A major advance in understanding how quinidine depresses maximum upstroke velocity (Vmax) is the Hondeghem-Katzung mathematical model which incorporates voltage-independent rate constants for binding to and unbinding from resting, open, and inactive Na channels, and a voltage shift of -40 mV for the Hodgkin-Huxley h-kinetics of quinidine-associated Na(More)
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