Cardiac fluid refers to the fluid found within the heart's chambers and surrounding structures. This fluid plays a crucial role in maintaining proper heart function by facilitating the movement of blood and nutrients. It helps to cushion the heart, reducing friction as it beats and ensuring efficient circulation throughout the body. In certain medical conditions, such as heart failure or pericarditis, the amount of cardiac fluid can become abnormal. Excess fluid may accumulate, leading to complications that can affect heart performance. Monitoring and managing cardiac fluid levels is essential for maintaining overall cardiovascular health.