Cardiac insufficiency occurs when a person’s heart disease continues to worsen and cardiac decompensation exceeds its compensatory function. In the early stages of cardiac insufficiency, the compensatory acceleration of the heart rate helps to increase the cardiac output to or near normal levels, however, the acceleration of the heart rate also increases myocardial oxygen consumption and shortens the coronary artery supply and ventricular filling time, while decreasing the cardiac output per beat. What are the laboratory tests for cardiac decompensation? 1, invasive tests mainly include cardiac catheterization and selective cardiovascular angiography in combination with this test item, selective indicator (including temperature) dilution curve to determine cardiac blood volume, intra-cavity electrocardiography, Hirschsprung’s bundle electrocardiography, endocardial and epicardial electrocardiography, endocardial myocardial biopsy, as well as cardiac ultrasound imaging and cardiovascular endoscopy. These examinations bring some trauma to patients, but can obtain more direct diagnostic information and have greater diagnostic value. 2.Non-invasive examinations include various types of electrocardiography, echocardiography, ultrasonic Doppler flowmetry, real-time myocardial acoustic imaging, digital subtraction cardiovascular angiography, etc. These examinations are non-invasive to patients, so they are more easily accepted, but the information obtained is more indirect, and with the continuous updating and improvement of instrument performance and examination techniques, their diagnostic value is rapidly increasing.