McGill Case 173

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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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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.