Infarction - Ischemia, Injury & Infarction.

Introduction

A normal (physiologic) “Q” wave measures less than 0.04 second

Depth measures less than 1/3 height of R wave

EKG

An abnormal (pathologic) “Q” wave measures 0.04 (small box) second or greater in duration and/or the depth measures greater than or equal to 1/3 height of R wave

Once an MI is completed, the ST segment will return to the baseline and the T wave will return to its normal orientation, but “Q” waves are often the one remaining change to a cardiac complex as evidence that tissue necrosis or tissue death (infarction) has occurred.

Authors and Reviewers

Authored by Thomas O Brien.
Medically reviewed by Dr.Jonathan Keroes, MD, Cardiology
Last Update: 11/8/2020