McGill Case 362

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This case report is kindly provided by Michael Rosengarten from McGill and is part of the McGill Cases. These cases come from the McGill EKG World Encyclopedia.

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This recording shows sinus rhythm at about 55/minute with a PR interval of 320 ms, a left axis deviation of the QRS and a poor R wave progression in the precordial leads. This is a first degree heart block with a left anterior hemi-block. The poor R wave progression could represent a previous anterior wall myocardial infarction.