A 60-year-old male with a history of coronary artery disease (CAD) and angina pectoris presents with two episodes of transient visual obscurations. Electrocardiogram (ECG) shows sinus rhythm with a heart rate of 82 bpm, P-R interval of 0.28 sec, qR pattern in lead I, rS pattern in leads II and III (SIII > SII), rSR' pattern in V1, qRs pattern in V5 with widened S wave, and QRS duration of 0.18 sec. The ECG diagnosis is: