McGill Case 173

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 172 | Next Case: McGill Case 174

These three panels are continuous and represent the testing of a Medronic model 7219 defibrillator. The channels are a surface EKG lead, a ventricular intra-cardiac recording and a marker channel from the device. The first panel shows rapid paced ventricular beats followed by a low energy shock which induces VF. The shock is not on the T wave.

The second panel shows the VF, note the readings of the marker channel.

The last panel shows the termination of the VF with a 20 joule shock and then ventricular pacing. Note the ST elevation of the paced beats.