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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.
When the pericardium (the sac around your heart) is inflamed, the amount of fluid between its two layers of tissue increases. As part of the exam, your doctor will look for signs of excess fluid in your chest. A common sign is the pericardial rub. This is the sound of the pericardium rubbing against the outer layer of your heart.