If the patient develops myocardial ischemia, angina pectoris, and rapid heartbeat, he or she should no longer be active and should sit down to rest and take sublingual nitroglycerin or other proprietary Chinese medicines such as quick-acting heart pills. If symptoms improve, follow up regularly with strict secondary prevention of coronary heart disease, including taking beta-blockers such as metoprolol succinate to control heart rate. If symptoms do not resolve in more than 20 minutes, visit the hospital and immediately check an 18-lead ECG, check troponin, cardiac enzymes, and cardiac ultrasound. If it is an acute ST-segment elevation myocardial infarction, perform immediate hemodynamic reconstruction therapy within the time window. In case of non-ST-segment elevation acute coronary syndrome, routine secondary prevention of coronary artery disease was performed according to the GRACE score guiding the timing of hemodialysis.