The symptoms of terminal heart failure in 90-year-old people may have the following manifestations: 1. Severe left heart insufficiency, mainly manifested as inability to lie down, only semi-recumbent or seated breathing, labored breathing, shortness of breath, which can be accompanied by a severe drop in blood oxygen, while the patient will have a severe cough. In acute exacerbation of heart failure, symptoms such as coughing up pink foamy sputum and increased heart rate may occur.2. Patients with severe right heart failure may also experience lifelong swelling, mainly in the lower extremities and abdomen, which may be accompanied by severe fluid accumulation in the chest, abdomen and pericardial cavity, as well as bruising in the digestive tract and symptoms such as gastric distention and indigestion.3. Heart failure may also lead to severe pulmonary bruising. Patients are combined with the occurrence of intrapulmonary infections and other conditions. Some elderly people with heart failure may suffer from malignant arrhythmias, such as ventricular tachycardia or ventricular fibrillation, which can cause sudden death.