Which term best describes the flatline ECG tracing with no mechanical heart activity?

• A. Agonal Rhythm
• B. Ventricular Tachycardia
• C. Asystole
• D. Ventricular Fibrillation

Answer: (C)

Asystole is the absence of electrical activity in the heart, so the ECG shows a straight, flat line and there is no mechanical heartbeat. This distinguishes it from an agonal rhythm, which can be a very slow, irregular electrical pattern that still shows some activity and may precede true asystole. Ventricular tachycardia is a fast, regular rhythm with wide QRS complexes, not a flat line, and ventricular fibrillation is chaotic, disorganized electrical activity with no coherent rhythm. In true asystole, the recommended response is high-quality CPR and epinephrine, with defibrillation not indicated. Always verify lead placement and check for any artifact before concluding asystole.