Complete Heart Block. The P Waves Occur at a Rate of 120, Independent of the Ventricular Rate of 50. The QRS Configuration is a Right Bundle Branch Block Pattern. The Regular Rate and Stable QRS Indicate that the Rescuing Focus is Probably Near the AV Junction. (From: Tilley LP. Essentials of Canine and Feline Electrocardiography, 3rd Ed. Blackwell Publishing, 1992, With Permission.)