EF, also called ejection fraction assesses the systolic and diastolic function of the human heart as well as the effective ejection volume per minute. If the EF is below 50%, it is called cardiac insufficiency. Normal human EF should be above 50%, which is only a specific indicator. If patients experience discomfort, they should also have clinical symptoms, such as chest tightness, shortness of breath, panic, enlargement of the liver and spleen, and edema of both lower limbs, which are all signs of cardiac insufficiency. Combined with the decrease of EF value, the diagnosis of cardiac insufficiency can be confirmed, and through these confirmations, the next treatment plan can be decided, so that the patient can get healthy as soon as possible.