Myocardial bridges in coronary angiography

Coronary angiograms were obtained on 23 normal dogs. Postmortem examination of these canine hearts revealed that myocardial bridges over the coronary arteries were present in 2 animals. Distortion of the coronary artery angiographic outline at the site of the myocardial bridges may resemble the angiographic view of a focal disease process. This distortion was transient in nature on angiograms taken during the regular rhythm, but it was persistent on films taken during acetylcholine arrest. The effects of the myocardial bridge on the coronary vascular angiographic pattern and its importance in interpretation of such studies warrants bringing it to the attention of coronary angiographers.