Why does cold trigger a coronary heart attack? Coronary heart disease is a heart disease caused by severe atherosclerosis, stenosis or blockage of coronary arteries causing myocardial ischemia, including angina pectoris, myocardial infarction, ischemic myocardium and asymptomatic myocardial ischemia and sudden death. Winter is the high incidence of coronary heart disease, especially when the temperature plummets, major hospitals cardiovascular department emergency room, wards are often overcrowded, the reason is that the human cardiovascular system is sensitive to changes in external temperature. First, the cold will stimulate the coronary arteries spasm contraction, if the coronary arteries are severely stenosed, the possibility of complications of myocardial infarction is increased. Second, the cold will cause peripheral vasoconstriction, which increases blood pressure, increases the load on the heart, increasing the incidence of myocardial ischemia and myocardial infarction. Third, the body has to consume energy to generate heat when it is cold, which increases the oxygen consumption of the heart, which increases the possibility of myocardial ischemia. Fourth, the cold season, the human body sweat less, drink less water, when the human blood viscosity increases, vascular resistance and blood pressure will rise, blood flow in the blood vessels slowed down, easy to form thrombus, blocking coronary arteries, resulting in the onset of coronary heart disease. In addition, cold weather people are prone to respiratory diseases, such as colds, upper respiratory tract infections, bronchitis, pneumonia, etc., which can aggravate the condition of existing cardiovascular disease. What should patients or their families do if they experience signs of coronary heart disease such as extreme fatigue, retrosternal cramps, chest tightness and breath-holding? If a patient shows signs of coronary heart disease, he or she should be highly suspicious of the possibility of coronary heart and even acute myocardial infarction, and the time when the signs appear is the golden time to save the patient’s life. If a patient with coronary heart disease has angina pectoris, he should absolutely rest in bed, keep the environment quiet, reduce the oxygen consumption of the heart muscle, and at the same time take sublingual cardiac pain, nitroglycerin and other coronary vasodilator drugs; if the pain is not relieved after repeatedly taking nitroglycerin, and the chest pain lasts for more than 30 minutes, the possibility of myocardial infarction should be considered, and the patient should immediately chew aspirin 300 mg and call the emergency number as soon as possible. The patient should immediately chew aspirin 300 mg, and call the emergency number as soon as possible, and ask professional medical personnel to come and send the patient to the hospital for treatment, while comforting and encouraging the patient to help him/her overcome the fear. If the patient suddenly loses consciousness and has cardiac arrest, family members should not move the patient easily and should immediately perform extracardiac massage in place while calling the emergency number. Other patients who show signs of the onset of coronary heart disease should seek medical attention as soon as their condition is stable. What are your suggestions for protecting heart health and preventing sudden onset of coronary heart disease in winter? 1, patients with coronary heart disease must pay attention to keep warm, remember to add more clothes in the morning and evening to avoid getting cold. Patients who have the conditions should live in a heated room and go out less when the weather is cold to avoid the stimulation of cold. 2, suffering from hypertension disease of coronary heart disease patients, especially pay attention to take regular antihypertensive drugs to avoid blood pressure fluctuations, increase myocardial oxygen consumption, resulting in the occurrence of angina. 3, to exercise in moderation, to avoid prolonged lying still. Patients with coronary artery disease should choose to do moderate physical exercise in the afternoon during the warmer hours, avoiding morning exercise. 4, reasonable diet, low salt, low fat, low sugar, eat more vegetables, fruits, drink more water, do not wait until thirsty to think about drinking water. 5, patients with chronic diseases must take their medication on time. 6, the elderly intestinal peristalsis is slow, must pay attention to prevent constipation. Constipation is a very dangerous situation for patients with coronary heart disease and must be given high priority.