👉 Regional fluid, also known as pericardial fluid or pleural fluid (depending on the location), is a clear, colorless liquid that fills the spaces surrounding major organs and cavities in the body. In the pericardial cavity, it lubricates the heart's movement within the chest wall, reducing friction and allowing for efficient pumping. Similarly, in the pleural cavity, it facilitates smooth breathing by cushioning the lungs against the chest wall. This fluid is produced by various sources, including the synovial lining of joints and the parietal pleura lining the inner chest wall, and is typically absorbed by the lymphatic system. Abnormalities in regional fluid, such as excessive accumulation (effusion), can indicate underlying health issues like heart disease, lung conditions, or infections.
