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- W2229888893 abstract "The traditional critical membrane potential (CMP), -55(-)-60 mV, which corresponds to effective refractory period (ERP), was anew investigated in guinea pig ventricular muscle fibres. The electrical and contractile responses to the stimulus during repolarization of action potential (AP), particularly from +10 to -60 mV, were observed. One third of 35 tested cells displayed testing action potential (TAP) and local response at > or = -54 mV when they were stimulated by testing pulses in 37 degrees C normal Tyrode's solution. Potential level of TAP which occurred earliest was at -30 mV and that of local response which appeared earliest was at 0 mV during repolarization among 95 systematic tests. Most of the TAPs belonged to the slow response potential type. The ratio of TAP evoked at > or = -54 mV initial membrane potential (IMP) was as high as 86% when the experiment was carried out in 37 degrees C 1.5 mmol KC1/L Tyrode's solution. In view of distribution of IMPs of TAPs, the CMP of ERP in guinea pig ventricular muscle fibres was more positive than traditional CMP measured by Hoffman et al. in dog, sheep Purkinje fibres and had a quite changeable range. The CMP of every cell in ventricular muscle was not all the same, and their CMPs approximated to normal distribution. There was no sharp line separating ERP from relative refractory period in myocardium. Higher temperature and low [K]0 were the important factors elevating CMP of ERP." @default.
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- W2229888893 date "1993-07-01" @default.
- W2229888893 modified "2023-10-16" @default.
- W2229888893 title "A reevaluation of the critical membrane potential of the effective refractory period in guinea pig ventricular fibres." @default.
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