Cardioplegia generally refers to propranolol, take propranolol a day and a half can not be suddenly stopped, if the condition allows you to stop the drug, you need to gradually reduce the dosage until the drug is stopped, should be standardized under the guidance of a doctor to take. Propranolol is a beta-blocker, used for hypertension, arrhythmia and other diseases, as well as to reduce the symptoms of angina pectoris palpitations and syncope. When taking propranolol can not be stopped at will, should be five to seven days to reduce the dose once, each time to reduce a quarter of a tablet, until all the medication dose is reduced, during the period of time at any time to observe changes in the condition of the disease. Central nervous system adverse reactions such as dizziness, confusion, depression, and unresponsiveness may occur with the use of this product. It should be contraindicated in the presence of bronchial asthma, cardiogenic shock, severe or acute heart failure, sinus bradycardia, and hypersensitivity to any of the components of the product. Eating propranolol generally can not be discontinued at will, it is recommended that patients go to the hospital in a timely manner, under the guidance of a doctor to standardize the use of medication, do not use on their own, so as not to damage their health.