What alleviating method does angina pectoris have suddenly?

Drug therapy 1. Drug therapy (1) nitrate preparation. These drugs not only dilate the coronary artery, reduce its resistance and increase its blood flow, but also reduce venous blood reflux, ventricular volume, intra-cardiac pressure, cardiac output and blood pressure, reduce the load before and after the heart and the oxygen demand of the myocardium by dilating peripheral blood vessels, thus relieving angina pectoris. Common drugs, such as nitroglycerin, are put under the tongue, so that they are quickly dissolved and absorbed by saliva. 1~2 minutes later, it takes effect and disappears in about half an hour. However, long-term repeated use will reduce the curative effect due to drug resistance. Nitroglycerin also has sprays and capsules. Adverse reactions include dizziness, swelling and pain in the head, jumping head, blushing and palpitation. Occasionally, blood pressure drops. Other nitrate preparations include isosorbide dinitrate and pentaerythritol tetranitrate. (2) Beta blockers. It can block the stimulation of sympathomimetic amine to heart rate and myocardial contractility receptor, slow down heart rate, lower blood pressure, reduce myocardial contractility and oxygen consumption, thus alleviating the attack of angina pectoris. In addition, it also reduces the hemodynamic response during exercise, which reduces the oxygen consumption of myocardium at the same level of exercise, narrows the arterioles (resistance vessels) in non-ischemic myocardium, and makes more blood flow into ischemic areas through extremely expanded collateral circulation. Adverse reactions include prolonged ventricular ejection time and increased cardiac volume, which may aggravate myocardial ischemia or cause heart failure, but its effect of reducing myocardial oxygen consumption far exceeds its adverse reactions. Commonly used preparations include propranolol, propranolol, indolol, sotalol, etc. (3) Calcium channel blockers. These drugs inhibit calcium ions from entering cells, thus inhibiting myocardial contraction and reducing myocardial oxygen consumption; It can also dilate coronary artery, relieve coronary artery spasm, improve myocardial blood supply, dilate peripheral blood vessels, reduce arterial pressure and reduce heart load; It can also reduce blood viscosity, prevent platelet aggregation and improve myocardial microcirculation. Commonly used preparations are verapamil, nifedipine, diltiazem, nicardipine and nisoldipine. Adverse reactions include headache, dizziness, nausea, vomiting, fatigue, constipation and insomnia.