Effect of pre-medication with beta blockers on scan time and imaging quality in patients having CT coronary angiography

exposure: timing of beta blocker administration for patients undergoing CTCA. pre-medication group: patients who were instructed to take oral beta blockers prior to arrival at the imaging department. Clarification: Timing of beta blocker administration is determined by standard clinical practice for each group. The decision regarding whether participants take oral beta blocker prior to arrival at the imaging department will be made by the referring cardiologist. The decision is based on the cardiologist's assessment of the individual patient, as well as their own judgement and practice preferences. Some cardiologists routinely prepare patients with oral beta blockers before CTCA to optimise heart rate control, while others prefer to leave rate control to be managed on-site. Participants who have been advised by their cardiologist to take oral beta blockers before the scan will form the premedicated group, while those who have not will form the stardard care group ( non-premedicated group). The rationale for asking participants to take oral beta blockers prior to arrival is to allow sufficient time for the medication to take effect, ensuring optimal heart rate reduction before CTCA imaging. Achieving a stable heart rate of <60bpm improves image quality and diagnostic accuracy by reducing cardiac motion artefacts. Pre-arrival beta blocker administration also minimises on-site preparation time and supports efficient workflow. Data collected from electronic medical records and radiation information system include heart rate and blood pressure at time of admission and at the time of scanning, type of beta blockers and administration time, CTCA scan quality, completion and relevant patient demographics ( Age, gender, hight and weight). No additional interventions are required for the study. Participants follow standard clinical procedures for CTCA preparation, no additional procedures are required for study purposes. It is only one time data collection, no long term follow-up is requried.