What Causes Myocardial Infarction?

Myocardial infarction generally refers to acute myocardial infarction (AMI). AMI is myocardial necrosis caused by acute, sustained ischemia and hypoxia of the coronary arteries. Clinically, it typically presents with severe, prolonged retrosternal chest pain that is not fully relieved by rest or nitrate medications. It is accompanied by elevated serum cardiac enzyme levels and progressive electrocardiographic changes. Complications may include arrhythmias, shock, or heart failure—conditions that can be life-threatening.

What Causes Myocardial Infarction?

1. Poor Dietary Habits

Eating too rapidly and regularly consuming foods high in fat, calories, and cholesterol can cause a sharp rise in blood lipid levels. This increases blood viscosity, predisposing individuals to vascular occlusion. Concurrently, heightened platelet aggregation—combined with pre-existing coronary artery stenosis—may promote thrombus formation, thereby triggering myocardial infarction.

2. Constipation

Myocardial infarction may be precipitated by constipation. Straining during defecation causes a rapid increase in intra-abdominal pressure. In patients with underlying cardiovascular disease, this strain may trigger myocardial infarction.

3. Cold Exposure

Autumn and winter are peak seasons for myocardial infarction. Failure to adequately protect against cold may cause vasoconstriction, leading to myocardial ischemia and subsequent infarction.

4. Excessive Physical Exertion

Myocardial infarction may result from overexertion. Neglecting to balance work and rest increases cardiac workload. Under conditions of elevated myocardial oxygen demand, acute myocardial ischemia may occur, potentially triggering coronary artery spasm—and, in severe cases, myocardial infarction.

5. Heavy Alcohol Consumption

Heavy alcohol intake can induce acute myocardial infarction by triggering coronary artery spasm and increasing myocardial oxygen demand.

6. Emotional Stress

Intense emotional fluctuations—such as excitement, tension, or anger—can also precipitate myocardial infarction.

The above outlines the primary causes of myocardial infarction. We hope this information is helpful to you.