McGill Case 260

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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 are two interesting strips that show a rate dependent bundle branch block that is probably a left bundle branch morphology. In the first recording a PVC (labeled V) creates a long RR interval and then allows the left bundle to recover and hence the narrow QRS complex. The lower strip shows the opposite where a PVC couplet shortens the RR interval and induces the left bundle branch again.