Aberrant ventricular conduction (aberrancy, aberration)
Aberrant ventricular conduction (aberrancy, aberration) Aberrant conduction is not a mechanism of arrhythmia; it is a ventricular conduction disturbance . It is discussed in this chapter because the phenomenon is frequently seen during arrhythmias. As discussed previously all cardiac cells (conduction cells and contractile cells) must repolarize rapidly in order to be excitable by the time the next action potential arrives. Should any component of the ventricular conduction system not have repolarized by the time the next impulse reaches the ventricles, the impulse will be blocked there. The length of the refractory period (discussed in Chapter 1, Basic electrophysiology ) varies with heart rate and it changes rapidly with changing heart rate. The length of the refractory period is shortened as heart rate increases and vice versa, i.e. the length of the refractory period is prolonged as heart rate decreases. It follows that long cycles (long RR intervals) are associated with long refract…
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