Why are PVCs considered dangerous?

• A. They could progress to lethal dysrhythmia
• B. They always require immediate surgery
• C. They have no clinical significance
• D. They improve with rest alone

Answer: (A)

Premature ventricular contractions are ectopic beats that originate in the ventricles. They’re potentially dangerous because, even though some PVCs can be harmless, they can disrupt the heart’s rhythm and, in people with existing heart disease or when PVCs occur frequently, they can trigger serious ventricular rhythms such as ventricular tachycardia or ventricular fibrillation. The risk is higher with frequent PVCs (like bigeminy or trigeminy), multifocal PVCs, sustained PVCs, or a PVC that lands on the preceding T wave (R-on-T), which can precipitate a malignant rhythm. This potential to escalate to a lethal dysrhythmia is why PVCs are considered dangerous. They don’t automatically require surgery, and they aren’t always insignificant or relieved by rest; management depends on the clinical context and heart health.