The terminal symptoms of pulmonary encephalopathy include impaired consciousness, epileptiform seizures, increased intracranial pressure and symptoms of the original disease. 1. Obstructed consciousness: due to carbon dioxide retention, severe hypoxia in the brain leads to coma, which is a state of deep coma at the end of life, with response to various stimuli and disappearance of physiological and pathological reflexes. 2. Epileptic seizure: the lack of oxygen in the brain can lead to epileptic seizure, manifested as tonic clonic limbs, foaming at the mouth, incontinence and so on. 3. Increased intracranial pressure: cerebral edema due to lack of oxygen in the brain leads to symptoms of cranial hypertension, which can seriously lead to cerebral hernia, affecting the vital center, and the vital signs are unstable, which may lead to death at any time. 4. Symptoms of primary disease: facial cyanosis, cyanosis of lips and mouth, rapid heart rate and other hypoxic manifestations. Patients with pulmonary encephalopathy should seek medical attention for rescue treatment.