Cardioplegia is the trade name and generic name for Propafenone. When taking propafenone, the heart panic is difficult to slow down the heart rate can be temporarily observed, the symptoms are obvious need to reduce the dose or stop the drug. 1. Propafenone is an antiarrhythmic drug that inhibits sodium ions, and can be used in the treatment of ventricular and supraventricular tachyarrhythmias. 2. Some patients may experience symptoms such as panic, chest tightness, nausea, vomiting, bradycardia, dizziness, or even fainting when taking the drug. 3. It is contraindicated in patients who are allergic to the components of the drug, cardiogenic shock, second- and third-degree atrioventricular block, severe bradycardia, and hypotension. If mild panic accompanied by slow heart rate occurs when taking Propafenone, it can be temporarily observed, and the symptoms of some patients will be gradually relieved. If the symptoms are obvious and severe bradycardia occurs, stop the drug in time, go to the hospital, and give treatment under the guidance of the physician.