This page covers how to calculate the QRS interval on electrocardiograms (EKGs/ECGs).
QRS interval: the time between the start and end of the QRS complex (i.e. the time of ventricular contraction). This should be less that 0.10 sec (~3 boxes). >100ms can represent a ventricular conduction abnormality (bundle branch block) or beats originating in the ventricular myocardium
Page Updated: 03.05.2018