INTRODUCTION

The finding of bundle branch block (BBB) on electrocardiograms (ECG) occurs in 0.6% of the population and in 1 to 2% of patients over 60 years of age; with organic heart disease it is found in 80% and coronary artery disease in 50% of patients (1). Left bundle branch block (LBBB) is seen in 0.01 to 1% of patients and although it may be seen in the absence of heart disease, it is most often associated with hypertensive heart disease, coronary artery disease, myocarditis or aortic valvular disease (1).