1. What is hyperbaric oxygen therapy? Hyperbaric oxygen therapy is a treatment method of inhaling high concentration of oxygen under high pressure environment, due to the greatly improved diffusion and penetration ability of oxygen, it can correct the hypoxia problem of local tissues, and solve the problem which cannot be solved by normal pressure oxygen inhalation. Hyperbaric oxygen is both “nutrient” and “stimulant” for nerve cells. Stroke is a concept of Chinese medicine, which refers to cerebrovascular diseases such as cerebral infarction and cerebral hemorrhage in western medicine. Hyperbaric oxygen plays an important role in the treatment of stroke and its sequelae. Clinical and experimental research, with hyperbaric oxygen comprehensive treatment of ischemic cerebrovascular disease, observation and treatment of 256 cases of patients, basic healing and significant improvement rate of 48.4%, the total effective rate of 89.94%, compared with the control group efficacy has significant differences. The significance is to improve the quality of life of patients and reduce the burden of society and family. 2. Why can hyperbaric oxygen treat stroke? This is because no matter “hemorrhagic stroke” or “ischemic stroke”, all of them are based on cerebral circulation and cerebral metabolism disorder and cerebral ischemia and hypoxia as the basic pathological basis, and the use of hyperbaric oxygen therapy: (1) Elimination of cerebral edema and protection of cerebral cells: Hyperbaric oxygen can make the oxygen penetrate to the local hypoxic brain tissue and enhance the capacity of the brain tissue. (1) Eliminate cerebral edema and protect brain cells: hyperbaric oxygen can make oxygen penetrate into local hypoxic brain tissues, especially the hypoxic area around the hemorrhage foci or infarction area (ischemic semi-dark zone), improve the oxygen supply to the local brain cells, and restore normal metabolism to the dying brain cells, thus protecting the brain cells; (2) It can make the normal brain tissues vasoconstriction, and there is “anti-stealing of blood”, which can make the blood flow of ischemic area increase; (3) (3) It can reduce the intracranial pressure, improve the vital activities of the body and the state of wakefulness, and help the recovery of consciousness disorders. (4) Promote the recovery of neurological function and reduce sequelae: It has been proved in practice that hyperbaric oxygen can promote the recovery of neurological function such as hemiplegia, aphasia, memory comprehension and so on after cerebral stroke, and greatly reduce the sequelae. 3.What conditions are suitable for hyperbaric oxygen therapy? (1) Cerebral thrombosis (cerebral infarction) leading to hemiplegia, aphasia and even consciousness disorder, once diagnosed, hyperbaric oxygen therapy can be actively carried out; especially for small and medium-sized cerebral infarction, the therapeutic effect is better. (2) Recovery period of cerebral hemorrhage: It is generally safe to start hyperbaric oxygen therapy one week after the hemorrhage is stabilized. Hyperbaric oxygen has good therapeutic effect on eliminating the edema around the hemorrhage foci, which can save more brain cells, promote the absorption of hematoma, and promote the recovery of neurological function; (3) Chronic cerebral insufficiency of blood supply, with recurrent dizziness, tinnitus, and cerebral ringing, etc.; (4) Preventing and treating vascular dementia.