The danger of low effective pumping force of the left ventricle mainly includes two aspects, one is ischemia of the body circulation and the other is stasis of the pulmonary circulation. 1. Physical circulation ischemia: the left ventricle has to pump oxygen-rich blood to the whole body. If the effective pumping force of the left ventricle is low, it will lead to a decrease in the amount of circulating blood, and there will be a lack of cerebral blood supply, a decrease in renal perfusion, and ischemia of muscle tissues. Patients may show dizziness, fatigue, and oliguria. 2. Pulmonary circulation stagnation: The oxygen content of blood increases after it passes through the pulmonary circulation and is then injected into the left ventricle. Low effective pumping force of the left ventricle will lead to stagnation of blood in the pulmonary circulation. Abnormalities in oxygen exchange may occur, and the patient may present with dyspnea, chest tightness and shortness of breath, and in severe cases may cough up pink foamy sputum. If the corresponding discomfort exists, it is recommended to consult a doctor as soon as possible to avoid delaying the condition.