Premature ventricular contractions lack what feature before the beat?

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Multiple Choice

Premature ventricular contractions lack what feature before the beat?

Explanation:
Premature ventricular contractions originate in the ventricles, so the beat begins without atrial depolarization triggering it. That means you don’t see a P wave before the ventricular contraction. The QRS that follows is usually wide and looks abnormal because ventricular activation spreads through the myocardium rather than the normal His-Purkinje system. A compensatory pause after the PVC is common as the heart resets. So the feature lacking before the beat is a preceding P wave.

Premature ventricular contractions originate in the ventricles, so the beat begins without atrial depolarization triggering it. That means you don’t see a P wave before the ventricular contraction. The QRS that follows is usually wide and looks abnormal because ventricular activation spreads through the myocardium rather than the normal His-Purkinje system. A compensatory pause after the PVC is common as the heart resets. So the feature lacking before the beat is a preceding P wave.

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