Mitral valve insufficiency can be said to be one of the more common rheumatic heart valve disease, heart valve disease symptoms are not obvious, and are relatively similar, so the diagnosis is a very important link, many patients actually do not understand the diagnosis of mitral valve insufficiency, the following we will learn more about it. A, the basic examination 1, X-ray examination: acute cases of normal cardiac shadow, or mild enlargement of the left atrium, with obvious pulmonary stasis, or even pulmonary edema signs. Chronic severe reflux commonly has enlarged left atrium and left ventricle, pulmonary stasis, and interstitial pulmonary edema. In pulmonary hypertension, right ventricular hypertrophy may be present. 2, ECG: ECG is mostly normal in acute cases, and sinus rhythm tachycardia is common. In chronic severe mitral valve insufficiency, mainly left atrial enlargement, some have left ventricular hypertrophy strain, non-specific ST-T changes, a few have right ventricular hypertrophy sign, atrial fibrillation is common. Echocardiography: Pulsed Doppler ultrasound and color Doppler flow imaging can detect systolic high-velocity jets on the atrial side of the mitral valve and in the left atrium, with a sensitivity of almost 100% for the diagnosis of mitral valve insufficiency, and the degree of regurgitation can be determined. Two-dimensional ultrasound can help to define the etiology and show the morphologic features of the mitral valve, i.e., mitral valve thickening, incomplete closure, and left atrial and left ventricular enlargement. Second, further examination 1, nuclear ventriculography: can determine the systolic function of the left ventricle and estimate the degree of regurgitation. 2.Left ventriculography: inject contrast into the left ventriculography and observe the amount of contrast reflux into the left atrium during systole as a criterion for semi-quantitative degree of reflux. Acute cases: If there is sudden onset of dyspnea, systolic murmur in the apical region, X-ray shows that the heart shadow is not large, but the pulmonary stasis sign is obvious and there is an etiology (such as mitral valve prolapse, infective endocarditis, acute infarction, etc.), the diagnosis can be made. In chronic cases, a typical murmur in the apical region with enlarged left ventricle and left atrium is also diagnostic. Definitive diagnosis depends on echocardiography. Since the systolic murmur in the apical region can be conducted to the left edge of the sternum, it needs to be differentiated from tricuspid valve insufficiency and ventricular septal defect. It should also be distinguished from functional murmurs and murmurs caused by left or right ventricular outflow tract obstruction. The above cases can be diagnosed by echocardiography. Complications: Atrial fibrillation and infective endocarditis are more common, and body circulation embolism may occur in those with large left atria and chronic atrial fibrillation. Heart failure occurs early in acute cases and only late in chronic cases. Other possibilities are arrhythmias and sudden death. It can be found that the diagnosis of mitral valve insufficiency is especially a systematic method, in addition to conventional X-ray, electrocardiogram and echocardiogram, late examination, and patients with relevant medical history and contraindications, also need to pay great attention to the diagnosis and treatment.