…slightly more than one third of patients without known disease who underwent elective cardiac catheterization had obstructive coronary artery disease… Low Diagnostic Yield of Elective Coronary Angiography In an article, published in the NEJM in 2010, the authors analyzed data from a national registry on cardiac catheterization, reporting only 38% of elective, diagnostic coronary angiograms showed obstructive lesions, and 39% …