McGill Case 353

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 352 | Next Case: McGill Case 354

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.