"High Number of Angiograms," Associated Press, March 11, 2010.

"...The researchers said the findings suggest doctors must do better in determining which patients should be subjected to the cost and risks of an angiogram.  The test carries a small but real risk, less than 1 percent, of causing a stroke or heart attack, and also entails radiation exposure...Angiograms are often given to patients who might be having a heart attack or have symptoms that suggest a serious blockage...Dr. Harlan Krumholz, a Yale cardiologist unconnected to the study, said he thinks the problem arises because doctors are afraid of missing something, and also getting sued."