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Function [edit]. The pericardial fluid reduces friction within the pericardium by lubricating the epicardial surface allowing the membranes to glide over each other with each heart beat.
A pericardial effusion is excess fluid between the heart and the sac surrounding the heart, known as the pericardium. Most are not harmful, but they sometimes can make the heart work poorly. The pericardium is a tough and layered sac. When your heart beats, it slides easily within it. Normally, 2 to 3 tablespoons of clear, yellow pericardial fluid are between the sac's two layers. That fluid helps your heart move easier within the sac. If you have a pericardial effusion, much more fluid sits there.