In Chinese medicine the Pericardium is not distinguished from the Heart, except that it is the first line of defence against external pernicious influences attacking the heart. The Pericardium is also called the "Heart Cover" or "Heart Governor". It is responsible for the "outer matters", the functionality of the heart, regulating blood circulation, heartbeat and heart frequency.
The Heart is also an organ of Fire Yin. The Pericardium is paired with its Yang Organ, the Triple Burner, and the Heart with the Small Intestine.