Description
Why It’s Done
This test is primarily recommended for patients with:
• Previous heart attack (myocardial infarction)
• Heart failure or reduced heart function (e.g., low ejection fraction)
• Coronary artery disease (CAD) with unclear benefit from revascularization
• Planning for revascularization procedures, such as coronary artery bypass grafting (CABG) or percutaneous coronary intervention (PCI)
The goal is to distinguish between:
• Viable myocardium (muscle that is alive but not functioning well due to reduced blood flow)
• Non-viable myocardium (scarred or dead muscle that will not recover function)
Identifying viable tissue helps in decision-making about the potential benefit of restoring blood flow to improve heart function.
Preparation
To ensure accurate results, follow these general preparation guidelines:
1. Fasting:
• Do not eat or drink anything except water for 4–6 hours before the test.
• In some cases, a high-fat, low-carbohydrate diet may be recommended the day before to enhance tracer uptake.
2. Blood Sugar Control:
• Diabetic patients should consult their doctor for specific instructions on managing insulin or oral medications before the test.
• Ideally, blood glucose levels should be below 180 mg/dL at the time of the scan.
3. Medications:
• Take prescribed medications unless otherwise directed.
• Bring a list of current medications to the appointment.
4. Avoid Caffeine and Tobacco:
• Avoid caffeine and smoking for at least 12 hours prior to the test.
5. Clothing:
• Wear comfortable, loose-fitting clothing.
• You may be asked to change into a hospital gown.
6. Inform Your Doctor If:
• You are pregnant or breastfeeding
• You have diabetes, kidney problems, or allergies to contrast materials
