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(From: Low Diagnostic Yield of Elective Coronary Angiography, Manesh R. Patel, M.D.,et al.,N Engl J Med 362;10, 886-895) …slightly more than one third of patients without known disease who underwent elective cardiac catheterizationhad obstructive coronary artery disease. The authors analyzed data from a national registry on cardiac catheterization, reporting only 38% of elective, diagnostic coronary angiograms showed obstructive lesions, and 39% of …