👉 The Kleins fluid, also known as the pericardial fluid, is a clear, colorless liquid that fills the space between the visceral (solid) and parietal (membrane) layers of the pericardium, a protective sac surrounding the heart. This fluid plays a crucial role in lubricating the heart's movement within the chest cavity, allowing it to beat efficiently without friction against the surrounding tissues. Its volume is typically very small, usually less than 150 milliliters, but it's essential for maintaining optimal cardiac function. When the fluid level drops significantly, it can indicate a serious condition like pericarditis or cardiac tamponade, requiring medical attention.
