Coronary angiography is an imaging technique which allows us to picture the coronary arteries supplying the heart and diagnose the extent of blockages in them. The angiography is used to determine which treatment option would be best for the patient. Traditionally coronary angiography is done by putting a plastic tube in the femoral artery I.e. The artery supplying the leg. Through this plastic tube called a sheath, small calibre plastic pipes are taken to the heart and dye injected into them to take pictures in cath lab. Now a days most of the coronary angiographies are being performed through radial artery I.e. Artery supplying the hand .