This ECG shows sinus rhythm with complete heart block and a junctional rhythm with a right-axis deviation. Additionally, ventricular depolarization in the precordial leads is suggestive of an anterior myocardial infarction.
Sinus rhythm is evidenced by the regular, steady progression of P waves with a P-P interval of about 90 beats/min. Complete atrioventricular dissociation indicates complete heart block.
A normal QRS duration of 106 ms at a rate of 56 beats/min supports the diagnosis of a junctional escape rhythm. Right-axis deviation is evidenced by an R axis of 120°.
Finally, poor R-wave progression with deep S waves in leads V1 through V5 is suggestive of an anterior myocardial infarction. However, in this case, there is no evidence of ischemia or history of infarction—so these are thought to be early postoperative findings.