1 Pain This is the first symptom. The location and nature of pain are the same as angina pectoris, but it often occurs in quiet or sleep. The pain is intense and extensive and can last for hours or days. Rest or nitroglycerin tablets can't relieve it. Patients are often anxious, sweating, afraid and have a sense of dying.

The general symptoms are mainly fever, accompanied by tachycardia, leukocytosis and accelerated erythrocyte sedimentation rate, which is caused by the absorption of necrotic substances. It usually occurs 24-48 hours after the pain occurs, and the degree is often positively correlated with the infarct area. The body temperature is generally around 38℃, and rarely exceeds 39℃ for a week.

About13 patients with gastrointestinal symptoms were accompanied by nausea, vomiting, epigastric pain and other symptoms at the initial stage of the disease, which was related to insufficient tissue perfusion caused by the stimulation of vagus nerve by necrotic myocardium and the decrease of cardiac output. Flatulence is not uncommon; In severe cases, you will burp.

Arrhythmia occurred in 75%-95% patients, mostly within 1-2 weeks after onset, especially within 24 hours. Diffuse abnormality may appear in electrocardiogram.