McGill Case 203

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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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The rhythm is sinus but the pr interval is prolonged (greater than 200ms) and the QRS is wide (> 120ms). The loss of the septal Q waves and the tall broad R waves in leads I, aVL and V6 are diagnostic of a left bundle branch block.