McGill Case 219

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 218 | Next Case: McGill Case 220

This is a rhythm strip from a patient with ventricular pre-excitation. Of interest is that the pre-excitation is manifested by premature atrial beats which cause four pre-excited ventricular complex (labeled V). This suggests that the refractory period of the A/V node is longer than that of the accessory pathway.