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- W2352237251 abstract "17 porcine hearts were used to investigate the sustained rhythmic bioelectrical activities in ventricular fibers (VF) induced by electrical stimulation and recorded intracellularly after various periods (24-96 hrs) of cold storage at 0-4℃. After cooling for 48 hours, the resting potential of VF became steady at a very low level of about -20 mV. It could not be increased simply by rewarming to 37℃. Continuous electrical stimulation, once per second, might induce in some VF a local electrical response with gradually increasing amplitude. Concurrently resting potential became more negative and propagative action potential began to appear. The action potentials were characterized by a hyperpolatization following each repolarization. As stimulation was continued, the hyperpolarization was increased and was then followed by an after-depolarizatlon, which became more and more prominent, leading finally to sudden appearance of sustained rhythmic activity. At first, the action potentials of the sustained rhythmic activity showed the characteristics of the slow responsive type, with E_(max) about -52±3 mV, total amplitude of action potential (E_t) about 55±7 mV and dV/dt_(max) under 10 V/sec. This type of rhythmic activity was designated the low level membrane potential type (LT), which might persist for several hours with a regular rate. The LT rhythmic activity tended to change into the high level membrane potential type (HT), which had the characteristics of the fast responsive type of action potential, with E_(max) about -62±19 mV, E_t 81±23 mV and dV/dt_(max) between 40 and 90 V/sec. HT rhythmic activity could be obtained also directly by electrical stimulation of VF when it was rewarmed to 37℃ after shorter periods of cooling (24-48 hrs) with a higher resting potential (more negative than -60 mV). The rate of HT rhythmic activity was regular when E_t was under 90 mV. As E_t increased gradually, the rate of rhythmic activity slowed down and became irregular. In some cases when E_t exceeded 100 mV, both hyperpolarization and after-depolarization disappeared, and a normal action potential of VF was obtained." @default.
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- W2352237251 date "1981-01-01" @default.
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- W2352237251 title "INDUCED RHYTHMIC MEMBRANE POTENTIAL CHANGES IN PORCINE VENTRICULAR MUSCLE CELLS AFTER COLD STORAGE" @default.
- W2352237251 hasPublicationYear "1981" @default.
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