Early symptoms of coronary artery disease Anterior heart pain is a typical symptom of coronary artery disease, which can attract the attention of patients. However, a few patients have atypical symptoms of coronary heart disease, which make patients take it lightly and often make doctors misdiagnose, thus delaying the diagnosis and treatment of coronary heart disease. (1) Some patients with coronary heart disease do not have chest pain, but only show various arrhythmias such as atrial fibrillation, ventricular premature, atrioventricular block, or shortness of breath, nocturnal paroxysmal dyspnea and other heart failure manifestations as the first symptoms, which is clinically called “arrhythmia and heart failure type of coronary heart disease”, which is a rare type of coronary heart disease. (2) Angina pectoris occurs outside the chest and manifests as headache, toothache, sore throat, shoulder pain and leg pain, which often need to be distinguished from the discomfort caused by the corresponding organs. (3) In a few patients with coronary heart disease, especially in acute myocardial infarction, only cerebrovascular manifestations such as dizziness, limb paralysis, sudden loss of consciousness, convulsions and other cerebral circulatory disorders are present, because in myocardial infarction, the blood supply to the brain decreases due to a decrease in cardiac output, and severe arrhythmia also often causes a decrease in blood supply to the brain. Therefore, when elderly people have cerebrovascular manifestations, electrocardiogram should be performed and followed up for a short period of time to exclude the possibility of acute myocardial infarction. (4) Gastrointestinal symptoms such as epigastric distension and pain, especially when the pain is severe, often accompanied by nausea and vomiting, are easily misdiagnosed clinically as acute gastroenteritis, acute cholecystitis, pancreatitis, etc. (5) If coronary artery disease is combined with other acute diseases, such as diabetic ketoacidosis, acute infection, surgical emergencies, even if acute myocardial infarction occurs, the symptoms are often masked. Therefore, patients and family members should reflect the condition of coronary heart disease to the doctor in a timely manner to provide reference to the doctor. (6) Since elderly people often have memory loss, dull senses, and are not good at expressing symptoms, they are easily ignored by family members and doctors, so don’t forget to do a routine electrocardiogram when doing relevant examinations for the elderly. Once evidence of myocardial ischemia is found, symptomatic treatment and further examination should be performed to confirm the diagnosis. Coronary angiography The most accurate way to diagnose coronary artery disease is by coronary angiography. Coronary angiography is an effective method for diagnosing coronary artery disease. It can reveal more clearly the anatomical abnormalities of the coronary arteries and the location, degree and extent of their obstructive lesions. Coronary angiography is the only method that can directly observe the morphology of coronary arteries, and is known as the “gold standard” in the medical community. Coronary angiography has important implications.