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Chronic posterior wall myocardial infarction

A chronic posterior wall infarct is characterized by a tall R wave in V1 (R/S >1.0). There is also a rightward axis.

Graphic 68277 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