McGill Case 134

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 133 | Next Case: McGill Case 135

These are two strips from the same patient during a pacemaker clinic visit. The first strip shows the patient's underlying rhythm.

The second strip is with the DDD pacmaker turned on, with a long sensed PR interval of 300 ms. Note that in spite of Mobitz I conduction above with some conducted intervals less than 300 ms., even with a long sensed AV interval of 300 ms. the patient no longer conducts through the AV node.