Abstract
<h3>To the Editor.—</h3> In his articles of cost and risk of coronary arteriography, Charles E. Hansing, MD (242:731; 242:735, 1979), demonstrated in a study of cardiac catheterization laboratories in the state of Washington that no correlation existed between the total number of cardiac catheterization procedures performed in a laboratory and the cost per procedure. Furthermore, no relationship existed between the risk per procedure and the number performed. Risk was more related to the type of patient undergoing angiography, with higher risk occurring in those with main left coronary stenosis, triple-vessel coronary disease, severe aortic stenosis, and congestive heart failure. These cost data corroborate findings of an impartial study of three hospitals in the San Francisco Bay area by the subcommittee on Cardiac Catheterization and Surgical Services of the Regional Medical Planning Committee (1976). Depreciation, wages and benefits, materials, services, and indirect expenses were taken into account. The three hospitals all
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