A diagnostic procedure utilized in cardiology assesses blood flow to the heart muscle, both at rest and during exertion. It involves injecting a small amount of radioactive tracer, often technetium-99m sestamibi (Cardiolite being a brand name), into the bloodstream. A specialized camera then captures images of the heart, revealing areas that may not be receiving adequate blood supply due to narrowed or blocked arteries. The patient typically undergoes a resting scan followed by a stress scan, achieved through exercise on a treadmill or, if unable to exercise, through pharmacologic stimulation.
This non-invasive cardiac imaging modality is critical in detecting coronary artery disease. By visualizing the distribution of the radioactive tracer in the heart muscle, physicians can identify regions of ischemia (reduced blood flow) and infarction (tissue death). This information is invaluable in guiding treatment decisions, such as lifestyle modifications, medication management, angioplasty, or bypass surgery. The procedure has evolved over the years, with advances in imaging technology and tracer agents leading to improved accuracy and reduced radiation exposure.
