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Chronic anterior wall myocardial infarction

A chronic anterior wall infarction is diagnosed by the presence of initial deep and broad Q waves in any of the precordial leads; in this case they are present in leads V1 to V4.

Graphic 66472 Version 2.0

Normal ECG

Normal electrocardiogram showing normal sinus rhythm at a rate of 75 beats/minute, a PR interval of 0.14 seconds, a QRS interval of 0.10 seconds, and a QRS axis of approximately 75°.

Courtesy of Ary Goldberger, MD.

Graphic 76183 Version 4.0