Prevalence of Narrowing ≥50% of the Left Main Coronary Artery Among 17,300 Patients Having Coronary Angiography

We sought to investigate the prevalence of left main coronary artery significant stenosis (LMSS) (≥50% of the luminal diameter) in an angiographic series of patients, to describe the associated coronary stenoses, and to assess the influence of age and gender on these findings. The angiograms of 17,323 consecutive patients from January 1, 1984 to December 31, 2003 were retrospectively analyzed. LMSS was found in 823 patients (4.8%) and was more predominant in men (p