What is a run of three or more PVCs classified as?

What is a run of three or more PVCs classified as?

• A. A run of atrial fibrillation
• B. A run of ventricular tachycardia (v-tach)
• C. A run of sinus tachycardia
• D. A run of bradycardia

Answer: (B)

A run of three or more premature ventricular contractions (PVCs) is classified as a run of ventricular tachycardia (v-tach). This classification is based on the origin of the contractions; PVCs arise from the ventricles, and when they occur in succession—three or more times—it indicates an abnormal and potentially dangerous rhythm that can compromise cardiac output and stability. Ventricular tachycardia can be sustained or non-sustained, with the former lasting longer than 30 seconds or requiring termination for hemodynamic stability. Recognizing this arrhythmia is essential in clinical practice because it can lead to more severe complications such as ventricular fibrillation, which is life-threatening. In contrast, other conditions like atrial fibrillation and sinus tachycardia originate from other structures in the heart and involve different underlying mechanisms and implications for patient care.