21. Repolarization of the membrane potential continues, resulting in an undershoot phase or absolute refractory period.22. The repolarization lasts approximately 75 ms. 23. The toxin could increase the duration of the repolarization up to sixfold at 100 �mol / l. 24. An increase in entropy during depolarization would release heat; entropy increase during repolarization would absorb heat. 25. Under IKr blockade a pronounced INalate can contribute to the development of arrhythmias by increasing repolarization variability. 26. During repolarization , the sodium channels begin to become inactivated, causing a net efflux of potassium ions. 27. Similarly, the currents that caused repolarization of the active nerve caused slight depolarization in the resting fiber. 28. It increases influx of sodium through these channels and delays repolarization , thus increasing excitability and promoting ventricular dysrhythmias. 29. In particular, ion pumps play no significant role in the repolarization of the membrane after an action potential. 30. Polymorphic ventricular tachycardia, on the other hand, is most commonly caused by abnormalities of ventricular muscle repolarization .
