Ventricular tachycardia (V tach) is defined as:

• A. Ventricular fibrillation
• B. Three or more consecutive PVC's with heart rate exceeding 100bpm
• C. Atrial flutter
• D. Sinus tachycardia

Answer: (B)

Ventricular tachycardia is a rapid rhythm that starts in the ventricles, and it’s defined by three or more consecutive ventricular beats with a heart rate greater than 100 beats per minute. This pattern shows that the rhythm is coming from the ventricles rather than the atria, which tends to produce a fast, regular, wide-complex tachycardia.

Why this definition fits best: having three or more consecutive ventricular events confirms that it’s a sustained change in the ventricular rhythm rather than a single extra beat, while the rate over 100 bpm distinguishes a true tachycardia from slower ectopic activity or a normal fast rhythm. The other options describe different conditions: ventricular fibrillation is a chaotic, irregular rhythm with no clear QRS, atrial flutter originates in the atria, and sinus tachycardia is a fast but still normal-appearing sinus rhythm.