Myocardial ischemia

Introduction Myocardial ischemia refers to a clinical state in which coronary blood flow is reduced by various causes, resulting in insufficient supply of myocardial oxygen and the like and reduced clearance of metabolites. Most heart diseases can cause myocardial ischemia and hypoxia.

Cause

After reaching a certain altitude, the body's pressure difference caused by altitude, less oxygen, air dryness, etc., cause the blood oxygen partial pressure to decrease. The general population may also suffer from myocardial deficiency due to the relatively weak compensatory ability of the body. oxygen.

Sometimes the pain in the precordial area or radiation pain, shortness of breath, exercise, fullness or agitation is also prone to myocardial hypoxia and weakness, and can be shocked in severe cases. Sometimes the symptoms are not typical, just a kind of chest tightness, chest tightness, burning or squeezing.

an examination

Related inspection

Dynamic electrocardiogram (Holter monitoring) ECG sub-health population test endothelin serum troponin I (TnI) and troponin T (TnT)

Mainly manifested as: palpitations, heart discomfort, sometimes heart pain or convulsions; shortness of breath, exercise, fullness or agitation is more serious, weakness in the whole body, short-term shock in severe cases. Clinically, there are many severe and persistent post-sternal pains. Rest and nitrate drugs can not be completely relieved, with increased white blood cells, fever, accelerated erythrocyte sedimentation rate, increased serum myocardial enzyme activity and progressive ECG changes, and can be complicated by arrhythmia, shock or heart. Complications such as exhaustion. An electrocardiogram can also be used to help diagnose.

Differential diagnosis

Myocardial infarction: refers to the interruption of coronary blood flow on the basis of coronary artery disease, causing severe and long-lasting acute ischemia in the corresponding myocardium, eventually leading to myocardial ischemic necrosis.

Myocardial abscess: Myocardial edema is one of the main clinical symptoms of dilated cardiomyopathy.

Myocardium is gray and relaxed: it is a kind of myocardial damage, which may be related to immune myocardial damage after viral infection, and is generally seen in ultrasound examination of dilated cardiomyopathy. Can be used as a differential diagnosis with other cardiomyopathy.

Myocardial stunning, also known as myocardial dysfunction after ischemia, means that myocardial transient ischemia has not caused myocardial necrosis, but mechanical resilience after reperfusion returns to normal blood flow requires hours, days or weeks. The phenomenon of complete recovery.

Cardiac hypertrophy: This is a slower but more effective compensatory function, mainly in the case of long-term stress overload, increased myocardial volume, increased contractility, allowing the heart to maintain a normal blood circulation, and at the same time Reserve power. However, this compensatory function also has its disadvantages, mainly because of hypertrophic myocardial aerobic increase, and the coronary blood supply is often unable to be met, resulting in myocardial ischemia, which will eventually lead to a decline in myocardial contractility. Hypertrophic cardiomyopathy is characterized by cardiac hypertrophy. It is characterized by ventricular muscle hypertrophy, typically in the left ventricle, with interventricular septum, occasionally concentric hypertrophy. The main manifestations are: palpitations, heart discomfort, sometimes heart pain or appreciation of colic; shortness of breath, exercise, fullness or excitement will increase and the body weakness, severe shock can be short-term.

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