A CTCA is best achieved when the heart rate is low. To achieve this, you may be given medications (beta blockers) to slow down your heart rate. Before the test, you will be advised to avoid caffeinated drinks or other stimulants before the procedure as it can raise your heart rate. As you will be given a contrast injection, it is advised to fast before the scan. You will need to arrive one hour prior to the appointment to complete a consent form and for further preparation if needed. It is important that you advise Vision Radiology staff if you have asthma, diabetes, kidney problems, irregular heart rhythm or any allergies. If you suffer from any of these, you may not be fit for the test. Occasionally, you may be asked to bring your most recent blood result to check your kidney function. If you have any relevant previous medical records, please bring them on the day.