The famous film actor Nick suffered a heart attack during the recording of the show. He has been taken to the hospital for treatment. The pericardial sac has two layers, a serous layer, and a fibrous layer. It encloses the pericardial cavity which contains pericardial fluid. The pericardium fixes the heart to the mediastinum, gives protection against infection, and provides the lubrication for the heart. As a professional doctor, you need to save Nick's life!