McGill Case 354

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 353 | Next Case: McGill Case 355

This is a regular rhythm at a rate of 65/min. The PR interval is 400 ms, the QRS is approximately 110 MS, and there are Qs waves in I, II, aVL, and poor R waves in the precordial leads. This is sinus rhythm with a marked first degree heart block. The QRS suggests an extensive anterior/latteral myocardial infarction.