The study compares radiation exposure parameters between coronary angiography procedures performed by left wrist, right wrist or groin (femoral) procedure access site

Patients referred for coronary angiography will be randomized to either left radial, right radial or femoral arterial access sites, and the coronary angiogram will be performed in a standard fashion, including left ventriculography. Radiation exposure parameters including Air Kerma, Dose-area product, Fluoroscopy time and Operator radiation exposure will be recorded. Operator experience as well as demographic data will be recorded.

Inclusion Criteria:

• All patients undergoing diagnostic coronary angiography

Exclusion Criteria:

• non-availability of one or more of the three access sites History of coronary artery bypass graft surgery Need for percutaneous coronary intervention.

Patients referred for diagnostic coronary angiography