Background and Objective:Complete Left bundle branch block(LBBB) increases the risk of cardiac mortality, and prognosis is primarily determined by the underlying coronary artery diseases. Our aim is to study the coronary angiographic profile in patients with symptomatic left bundle branch block(LBBB).

Material and Methods: This observational study  was done on 48 symptomatic patients of LBBB  during a study period of nine months from April 2017 to December 2017 in a tertiary care hospital at Chennai,Tamilnadu.These patients were subjected to coronary angiography and all the data were collected and analyzed by SPSS 20.

Results: Out of 48 Symptomatic LBBB  patients, 33(68.8%) were male&15(31.3%)were female.Mean age of our study population was 54 yrs.On risk factor analysis,33% of them had diabetes,23% had hypertension and 27% of patients were smoker.Among the 48 patients,21(44%) presented with STEMI,19(40%) with NSTEMI and 8(16%)with stable ischemic heart disease.Patients were profiled on the basis of CAG as left main disease, triple (TVD), double (DVD) & single vessel disease (SVD). Among the 48 patients studied, 27 patients had coronary artery disease.CAG analysis showed SVD  in 22(46%)pts, DVD in 2(4%), TVD  in 3(6%) pts and 21(44%)patients has normal coronaries.LMCA was  normal in all the patients. Of the three,Left anterior descending artery(LAD) is the most commonly involved vessel.

Conclusion:Left bundle branch block was associated with Significant coronary heart disease and  left ventricular dysfunction in our study population.Diabetes and Hypertension were common risk factors associated with symptomatic LBBB patients.From our study,we conclude that Symptomatic LBBB patients were prone to have significant Coronary artery disease and hence Coronary Angiogram should be considered in all patients.