Key result
Ethanol directly modifies the spontaneous discharge of rabbit sino-atrial node pacemaker cells by reducing time-dependent current systems, including slow inward and potassium outward currents.
Why the study?
Does ethanol alter the electrophysiological properties and membrane currents of rabbit sino-atrial node pacemaker cells?
Does ethanol alter the electrophysiological properties and membrane currents of rabbit sino-atrial node pacemaker cells?
Ethanol directly modifies the spontaneous discharge of sino-atrial node pacemaker cells by reducing time-dependent current systems rather than affecting a single current.
Answers are grounded in this paper and cite their sources.
Ethanol effects on rabbit SA node currents may inform alcohol-related arrhythmia mechanisms; leaves open human translation.
Electrophysiological effects of ethanol on rabbit sino-atrial node were studied by means of the double-microelectrode voltage clamp method. In spontaneously beating preparations, ethanol (above 1%) decreased the maximum rate of depolarization of the action potential. Furthermore, 3% ethanol produced a significant decrease in the action potential amplitude, the action potential duration at 50% repolarization and the rate of the diastolic depolarization. Of the current systems, voltage clamp studies showed that ethanol reduced the slow inward current, the time-dependent potassium outward current and the hyperpolarization activated inward current. These observations indicate that ethanol does not have an effect on a single current system, but directly modifies the spontaneous discharge of sino-atrial node pacemaker cells due to a reduction of the time-dependent current systems.
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Kotake et al. (1989) studied this question. Ethanol was evaluated on Electrophysiological effects on action potential and current systems. Ethanol directly modifies the spontaneous discharge of rabbit sino-atrial node pacemaker cells by reducing time-dependent current systems, including slow inward and potassium outward currents.
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