CPT® Code 78494

Cardiac blood pool imaging, gated equilibrium, SPECT, at rest, wall motion study plus ejection fraction, with or without quantitative processing

Cardiac blood pool imaging, gated equilibrium, is a diagnostic procedure that utilizes single photon emission computed tomography (SPECT) to evaluate the heart's ability to pump blood effectively. This imaging technique involves the use of a radiolabeled isotope tracer, which is injected into the patient's bloodstream to visualize the heart's function. SPECT employs one or more gamma cameras that capture the emitted gamma radiation from the tracer, allowing for the creation of detailed three-dimensional images of the heart. During the procedure, the patient is positioned on an imaging table, and cardiac electrodes are placed to monitor the heart's electrical activity through continuous electrocardiogram (ECG) tracing. The gamma camera(s) are strategically positioned over the chest to ensure optimal imaging. An intravenous line is established for the administration of the radiolabeled tracer, which circulates through the heart and blood vessels. Following the injection, scanning occurs at predetermined intervals, during which the emitted radioactive energy is transformed into images that can be analyzed on a computer. This process enables the physician to assess the motion of the heart walls and determine the heart's pumping efficiency. Additionally, the ejection fraction, a critical measurement indicating the percentage of blood ejected from the heart with each contraction, is calculated using a gated equilibrium technique. This technique synchronizes image capture with the heart's electrical signals, resulting in high-resolution images that provide valuable insights into cardiac function. The physician interprets the images, calculates the ejection fraction, and may quantify other functional parameters based on the distribution of the radionuclide, culminating in a comprehensive written report of the findings.