Brain hypoxia is when the brain isn’t getting enough oxygen. This can occur when someone is drowning, choking, suffocating, or in cardiac arrest. Brain injury,中风， 和一氧化碳中毒are other possible causes of brain hypoxia. The condition can be serious because brain cells need an uninterrupted flow of oxygen to function properly.
There are many medical conditions and events that interrupt the flow of oxygen to your brain. Stroke, cardiac arrest, and an irregular heartbeat can prevent oxygen and nutrients from traveling to the brain.
氧耗尽的其他可能原因包括：
- 低血压, which is extremely low blood pressure
- 手术期间的麻醉并发症
- choking
- 一氧化碳中毒
- drowning
- breathing in carbon monoxide or smoke
- 前往高海拔（8,000英尺以上）
- brain injury
- strangulation
- 医疗条件使得难以呼吸，如极端asthma袭击
Anyone who experiences an event where they aren’t getting enough oxygen is at risk for brain hypoxia. If your job or regular activities involve situations that deprive you of oxygen, your risk is greater.
Sports and hobbies
参加体育患者，主管是常见的，如拳击和足球，也让您对脑缺氧的风险。长时间呼吸呼吸的游泳者和潜水员也易受影响。山地登山者也有风险。
Medical conditions
You’re at risk if you have a medical condition that limits the transfer of oxygen to your brain. These conditions include:
- amyotrophic lateral sclerosis (ALS), which is a degenerative disease affecting the nerves in the brain and spinal cord. ALS can result in weakness of the breathing muscles.
- 低血压
- asthma
Brain hypoxia symptoms range from mild to severe. Mild symptoms include:
- 临时记忆损失
- reduced ability to move your body
- difficulty paying attention
- difficulty making sound decisions
严重症状包括:
您的医生可以通过检查您的症状，最近的活动和病史来诊断大脑缺氧。体检和测试通常是过程的一部分。测试可能包括：
- a blood test that shows the amount of oxygen in your blood
- an核磁共振成像扫描，显示头部的详细图像
- aCT scan，它提供了头部的三维图像
- an超声心动图，它提供了你心灵的形象
- anelectrocardiogram, which measure your heart’s electrical activity
- anelectroencephalogram (EEG), which measures the electrical activity of your brain and pinpoints seizures
Brain hypoxia requires immediate treatment to restore the flow of oxygen to your brain.
The exact course of treatment depends on the cause and severity of your condition. For a mild case caused by mountain climbing, for example, you would immediately return to a lower altitude. In more severe cases, you need emergency care that places you on a ventilator (breathing machine).
Your heart may need support as well. You might receive blood products and possibly fluids through an intravenous tube.
Seeking immediate treatment reduces your chances of brain damage.
您还可以接受血压问题的药物或控制您的心率。遏制药物或麻醉剂也可能是您治疗的一部分。
Recovering from brain hypoxia depends largely on how long your brain has gone without oxygen. Depending on the severity of your condition, you may have recovery challenges that eventually resolve. The potential challenges include:
People whose brain oxygen levels have been low for longer than 8 hours usually have a poorer prognosis. For this reason, people with severe head injuries are usually monitored in the hospital immediately after injury to make sure their brains are getting enough oxygen.
您可以通过监测某些健康状况来防止脑缺氧。如果你的血压太低，请参阅医生，如果你是哮喘的话，始终在附近保持吸入器。如果您容易受到高度疾病，避免高海拔。因为人们出乎意料地剥夺了氧气，例如在火灾期间，立即cardiopulmonary resuscitation (CPR)有助于防止条件变得更糟。