Removal of the pericardium may cause enlargement of the heart’s size and affect its function. The pericardium is a membranous sac that covers the surface of the heart and serves to protect the heart from over-expansion. For certain diseases that compress the heart, such as constrictive pericarditis, which compresses the heart and affects its expansion, it can be treated by removing the pericardium. Pericardiectomy does not limit the size of the heart, and may cause the heart to expand in size, affecting its function. After pericardiectomy, it is necessary to monitor the heart function regularly, to develop good living habits and dietary habits, to eat a light diet and avoid the stimulation of spicy food, and if there is a disease of the heart, it is necessary to actively consult the doctor for timely treatment of heart disease, so as to avoid problems with the function of the heart.