McGill Case 353

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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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This is a recording from a middle aged woman with recurrent atrial fibrillation. She was treated with flecainide with some improvement of her symptoms. The above is a recording taken in the cardiac clinic. It shows group beating with sinus rhythm. There are missing P waves. This suggests that there is sinus node arrest or that this is sinus node exit block.