Τo investigate via ultrasound whether the prophylactic use of acetylsalicylic acid 9 days after coronary angiography with transradial access reduces the incidence of radial occlusion.who underwent coronary angiography with transradial (TRA) access. Patients after coronary angiography were divided into 2 equal groups with similar characteristics (mean age, mean BMI) were the Group A received for 9 days acetylsalicylic acid 100 mg while the Group B was untreated. All patients were tested with Doppler ultrasound 1 month after coronary angiography.