Which of the following statements is incorrect w.r.t. ECG?

Biology NEET Full Syllabus Mock Test 180 Questions New Syllabus Mock Test - 11 PCB Single Correct MCQ

Published on: August 13, 2026

The end of T-wave marks the end of ventricle systole

By counting the number of QRS complexes that occur in a given period, one can determine heart rate/pulse rate of an individual

Elevated ST wave in ECG indicates myocardial infarction

Enlarged Q wave indicates cardiac arrest

Text Solution

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The correct answer is:

• T-wave represents ventricular repolarisation, so its end corresponds to the end of ventricular systole.

• Each QRS complex corresponds to one ventricular contraction (heartbeat). By counting the QRS complexes, one can determine the heart rate.

• ST-segment elevation is a hallmark of myocardial infarction (heart attack).

• An enlarged/deep Q wave is associated with myocardial infarction, not cardiac arrest.

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