What to know about a cardiac PET scan

PET imaging can show how blood reaches heart muscle and whether areas of tissue are using energy differently. The protocol depends on the reason for referral: clinicians may assess reduced blood flow, living heart muscle, inflammation, or another specific concern. CT images may add anatomical detail when a PET-CT scanner is used.

The tracer and preparation are not identical for every cardiac study. Some protocols involve a medicine that changes the heart's workload, while others focus on suppressing normal heart-muscle glucose use. The report is interpreted with symptoms, ECG findings, echocardiography, and other tests.

Follow the nuclear medicine team's instructions about food, caffeine, exercise, medicines, and diabetes treatment; cardiac protocols can be particularly sensitive to preparation. Tell staff about asthma, pregnancy, breastfeeding, diabetes, kidney problems, and medicines that affect heart rate or blood pressure. Bring previous cardiac reports and arrive with time for checks and tracer administration.

Ask which [FDG Radiotracer](/materials/fdg-radiotracer/) protocol is planned and what the [PET-CT Scan](/treatments/diagnostics-and-staging/pet-ct-scan/) involves.

Tell staff immediately about chest pain, marked breathlessness, severe dizziness, palpitations, or feeling faint during preparation or imaging. Seek urgent help for severe chest pressure, collapse, or difficulty breathing after leaving. These symptoms need assessment even if the scan has not started or the result is reassuring.

What cardiac question is the scan designed to answer? Which tracer and preparation will be used? Should I take my usual medicines? Will the test involve a stress medicine? When will the results be discussed, and what other test might be needed?