Enhanced Automaticity

Automaticity, as outlined earlier, describes a cell's ability to raise spontaneously (depolarize) the resting membrane potential above the threshold value to initiate an action potential. Enhanced automaticity resulting in tachycardia may result from an increase in the slope of phase 4 depolarization or a decrease (less negative) in the resting membrane potential. Activation of p-adrenoceptors, hypokalemia, and stretching of cardiac cells all increase the slope of phase 4 depolarization and may serve as the trigger for enhanced automaticity. It is also possible for tissue that normally does not have pacemaking capabilities to develop inappropriate spontaneous diastolic depolarization and serve as an ectopic focus for impulse generation.

Dealing With Erectile Dysfunction

Dealing With Erectile Dysfunction

Whether you call it erectile dysfunction, ED, impotence, or any number of slang terms, erection problems are something many men have to face during the course of their lifetimes.

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