What does the presence of a wide QRS complex on ECG indicate?

A wide QRS complex with sporadically absent preceding P waves is indicative of premature ventricular contraction, whereas a wide QRS complex with consistently absent or dissociated P waves is indicative of ventricular tachycardia.

When considering an ECG, recall that the first electrical signal represents atrial contraction (P wave), which is followed by a short delay (PR interval), after which the ventricles contract (QRS wave), hold (ST segment) and relax (T wave).

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This post was written by Omar Rifai