McGill Case 362

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. Previous Case: McGill Case 361 | Next Case: McGill Case 363

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.