ECG Tutorial   
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Heart Rate
PR Interval
QRS Interval
QT Interval


To determine the QRS Interval.

The QRS interval represents the time it takes for depolarization of the ventricles. Normal depolarization requires normal function of the right and left bundle branches. The QRS duration may vary with the size of the heart and is longer in the base-apex lead. A block in either the right or left bundle branch delays depolarization of the ventricle supplied by the blocked bundle, resulting in a prolonged QRS duration (rare in large animals).

Copyright 1999 University of Pennsylvania School of Veterinary Medicine
Faculty Sponsor: Dr. Virginia Reef
Student: Jeff Horst  V'02
Date this page was last updated: July 29, 2002