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When the self-triggering impulse does not arrive at the AV node and travels a different and slower path over the ventricles, the QRS becomes widened and is classified as ___________

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When the self-triggering impulse does not arrive at the AV node and travels a different and slower path over the ventricles, the QRS becomes widened and is classified as ___________

(a) Ectopic beat

(b) Ventricular-ectopic beat

(c) Ventricular beat

(d) Atrio-ventricular beat

I had been asked this question during a job interview.

Origin of the question is Video Printers in chapter Recording System of Biomedical Instrumentation

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Right answer is (b) Ventricular-ectopic beat

Explanation: Sometimes irritation occurs in the ventricles, the self-triggering impulse does not arrive through the node and thus travels a different and slower path in spreading over the ventricles. The QRS wave then becomes widened, and is classified as a ventricular ectopic beat. This ectopic beat is classified from ventricles so it is called as a ventricular ectopic beat.

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