The main reason for a fall in coronary heart disease may be sudden chest pain, angina pectoris or heart attack, or malignant arrhythmia, which causes the patient to fall to the ground suddenly due to pain or insufficient blood supply to the brain. Coronary atherosclerotic heart disease is a heart disease caused by atherosclerotic lesions in the coronary arteries, resulting in narrowing or blockage of the blood vessel lumen, causing myocardial ischemia, hypoxia, or necrosis, and is often referred to as “coronary heart disease”. Its typical symptom is chest pain triggered by physical activity, emotional excitement, etc., sudden pain in the precordial area, mostly episodic colic or squeezing pain, but also for the sense of suffocation when myocardial infarction occurs, chest pain is severe, long duration (often more than half an hour), nitroglycerin can not be relieved, and there may be nausea, vomiting, sweating, fever, or even cyanosis, blood pressure drop, shock, heart failure, heart attack, and so on. Malignant arrhythmia refers to the arrhythmia that can cause serious hemodynamic disorders in a short time, causing fainting or sudden death, and is clinically divided into two main categories, one is tachyarrhythmia, and the other is bradyarrhythmia. Tachyarrhythmias include ventricular tachycardia, ventricular flutter, and ventricular fibrillation. Severe bradyarrhythmias include severe sick sinus node syndrome and third-degree atrioventricular block. Therefore, patients with a history of coronary artery disease or malignant arrhythmia must usually take rest, and it is best not to be alone. Prepare some nitroglycerin and other drugs, once the discomfort occurs to call 120 the first time to the hospital, so as not to delay the condition.