The rhythm is atrial flutter with flutter waves seen best in the inferior leads and in leads V1 to V3. The atrial rate is about 250/min. The QRS is wide (>120ms) an there is a tall R' wave in V1 and a shallow S in V6. The axis of the QRS seems normal. The EKG shows a right bundle branch block. Rate (/min) 54 QT (ms) 559
pr (ms) 357 QRS axis (degrees) 80
QRS (ms) 183