Clinical associations of left bundle branch block in a University Hospital in Saudi Arabia: a retrospective study of 75 cases

ABSTRACT

Medical records of 75 patients with known left bundle branch block were analysed for their clinical associations including various cardiac and non-cardiac diseases, ECG analysis; of mean frontal plane QRS axis, and echocardiographic analysis of left ventricular size and function and left atrial size. Hypertension and coronary atherosclerotic heart disease were the commonest clinical diseases found occurring in 39 of 75 patients [52%.]. Cardiomyopathy was noted in nine [12%]. Fifteen [20%] had no identifiable disease. Left axis; deviation was present in 35% and the majority of these [96%] had associated cardiac disorder. Of the 1 5 patients without an identifiable cardiac disease, 14 [93%] had a normal QRS axis. About 50% of the patients had echocardiographic evidence of left ventricular dysfunction