McGill Case 218

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 217 | Next Case: McGill Case 219

The right and left arm leads have been reversed in the top tracing. Note the negative P wave in I which suggests that this is not a form of dextrocardia. Note that the precordial leads are unchanged by this error, which also excludes dextrocardia. Note that aVF changes little, aVL switches with aVR, II switches with III.