CPT® Code 93561

Deleted

Indicator dilution studies such as dye or thermodilution, including arterial and/or venous catheterization; with cardiac output measurement (separate procedure)

Indicator dilution studies, specifically those involving cardiac output measurement, are diagnostic procedures utilized to assess the functionality of the heart and its ability to pump blood effectively. These studies are particularly valuable in identifying conditions such as intracardiac shunts, which are abnormal connections between the heart chambers, and valvular regurgitation, where blood leaks backward through a valve. Cardiac output itself is a critical parameter that quantifies the volume of blood ejected from the heart into the systemic circulation each minute, providing essential insights into cardiac performance. The methodology of these studies can vary based on the technique employed—either dye dilution or thermal dilution. In dye dilution studies, a contrast dye is introduced into the bloodstream, and its concentration is measured to determine cardiac output. Conversely, thermal dilution involves the injection of a cold or warm fluid, with temperature changes being monitored to calculate the output. Both techniques require the insertion of specialized catheters into the venous or arterial systems to facilitate accurate measurements and ensure the reliability of the results obtained.