What should you know about myocardial PET scan?

A myocardial PET scan uses a small radiotracer dose and PET-CT imaging to show how active heart muscle is. The result adds functional information to your symptoms, examination and other heart tests; it does not by itself provide a complete diagnosis.

The tracer travels through the bloodstream and collects differently in tissues according to their activity. A camera records these signals while the scanner creates images. Your team may compare images taken under different conditions to assess blood flow and whether heart muscle is receiving enough oxygen.

The scan is different from a routine CT because it focuses on tissue function as well as anatomy. An abnormal area can have several explanations, so the report is interpreted alongside your medical history and other results.

Follow the imaging centre's instructions about fasting, caffeine, medicines and activity. Tell the team if you have diabetes, are pregnant or could be pregnant, are breastfeeding, or have difficulty lying still. Wear comfortable clothing and bring a list of medicines and relevant reports.

The tracer is given through a vein. You will need to remain still during image capture, which can take time. Ask how long the visit may last and whether a planned medicine must be changed; do not stop prescribed treatment without specific instructions.

Contact the imaging service promptly if you develop increasing redness, swelling or pain at the injection site. Seek urgent medical help for chest pressure, severe breathlessness, fainting or new weakness, whether these symptoms occur before or after the appointment.

Ask what clinical question the scan is intended to answer, whether you need stress imaging, which medicines or foods to avoid, and when the report will be reviewed with you.