EF, also called ejection fraction, evaluates the systolic and diastolic function of the human heart as well as the effective blood ejection per minute. If the EF is lower than 50%, it is called cardiac insufficiency, and the normal human body’s EF value should be above 50%, which is only a specific indicator. If the patient is not feeling well, clinical symptoms should also be the main focus, such as chest tightness, shortness of breath, panic, enlargement of the liver and spleen, and edema of both lower limbs, which are all manifestations of cardiac insufficiency. Combined with the decrease in EF value, the diagnosis of cardiac insufficiency can be confirmed, and the next treatment plan can be decided through these confirmations, so that the patient can get healthy as soon as possible.