**Core Concept**
Premature Ventricular Complexes (PVCs) are abnormal heartbeats originating from the ventricles, prior to the normal sinus rhythm. They are characterized by a sudden, early contraction of the ventricles, which can disrupt the normal cardiac rhythm.
**Why the Correct Answer is Right**
PVCs do not have a preceding P wave, as they originate from the ventricles rather than the atria. The QRS complex is typically wide due to the abnormal depolarization of the ventricles. Complete compensatory pauses may occur between PVCs and the next normal sinus beat, depending on the timing of the PVC. However, a prolonged PR interval is not a feature of PVCs, as the PR interval refers to the time between the P wave and the QRS complex, which is absent in PVCs.
**Why Each Wrong Option is Incorrect**
**Option A:** Wide QRS complex is a characteristic of PVCs, as the abnormal ventricular depolarization leads to a broad QRS complex.
**Option B:** Absent P wave is a feature of PVCs, as they originate from the ventricles and do not have a preceding P wave.
**Option C:** Complete compensatory pauses may occur between PVCs and the next normal sinus beat, depending on the timing of the PVC.
**Clinical Pearl / High-Yield Fact**
PVCs can be a sign of underlying cardiac disease, such as coronary artery disease, cardiomyopathy, or electrolyte imbalances. It is essential to investigate the cause of PVCs to prevent potential complications.
**β Correct Answer: D. Prolonged PR interval. A prolonged PR interval is not a feature of Premature Ventricular Complexes (PVCs).**
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