Asystole is described as which of the following on ECG?

• A. Characterized by a flatline with no fluctuation from the baseline on all leads.
• B. Characterized by a clearly defined rhythm with regular P and QRS complexes.
• C. Characterized by a rhythmic but very slow rate with visible QRS.
• D. Characterized by a lack of discernible electrical activity on ECG, with possible baseline fluctuations; differentiate from fine VF by evaluating another lead.

Answer: (D)

Asystole on the ECG means there is no recognizable electrical activity at all. The tracing essentially shows a flat line, with no P waves, no QRS complexes, and no organized rhythm. However, in real life there you may see tiny fluctuations on the baseline due to electrical or motion artifacts, so you can have baseline noise even when there’s no true cardiac activity. The important check is to verify the absence of electrical activity across leads; if another lead shows some activity, what you’re seeing isn’t true asystole, and you’d consider other rhythms such as fine ventricular fibrillation. So the best description is a lack of discernible electrical activity on ECG with possible baseline fluctuations, and you differentiate from fine VF by evaluating another lead.