Abstract
Background: To find out the frequency and pattern of left main stem (LMS) stenosis among patients who had coronary angiography in a tertiary care hospital.
 Methodology: The cross-sectional observational study was carried out for the duration of six months. Total number of 123 patients referred for coronary angiography to the department of cardiac catheterization (Cath Lab). All patients underwent coronary angiography, diagnosis of LMS stenosis was made. Pattern of LMS (ostial or distal) and vessel involvement was also observed.
 Results: Mean age of patients was 51.12±10.44 years. There were 81 (65.85%) males and 42 (34.15%) female patients. There were 39 (31.71%) obese, 50 (40.65%) patients were diabetics, hypertension was found in 83 (67.48%) patients, and 46 (37.40%) were smokers. LMS disease was found in 15 (12.20%) patients. Ostial LMS was found in 05 (4.07%) and distal LMS in 10 (8.13%) patients.
 Conclusion: There is a high prevalence of left main disease. Majority of patients with LMS have distal lesions.
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