McGill Case 149

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 148 | Next Case: McGill Case 150

This is a strip from a 21 year old patient during threshold testing in the pacemaker clinic. The patient had congenital heart block for which a pacemaker was implanted. She was asymptomatic before the implant, and a dizzy period during the test below.