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Progression of Anoxic Brain Damage  
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Copyright © Nucleus Medical Media, Inc.

Definition  

Anoxic brain damage is injury to the brain due to a lack of oxygen. Hypoxia is the term to describe low oxygen. Brain cells without enough oxygen will begin to die after about four minutes.

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Causes  

Oxygen is carried to the brain in the blood. Anoxic brain damage may occur if:

  • Blood flow to the brain is blocked or slowed. This can happen with:
  • The blood flow is normal but the blood is not carrying enough oxygen. This may happen if:
    • You have lung disease
    • There is a lack of oxygen in the air, which may occur at high altitudes
    • You have prolonged exposure to certain poisons or other toxins, such as carbon monoxide
    • You have an event that is stopping you from breathing normally, such as drowning, choking, or suffocation
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Risk Factors  

The following accidents and health problems may increase your chance of anoxic brain damage:

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Symptoms  

Severe damage may lead to a coma or a vegetative state. Mild to moderate hypoxic brain damage may cause:

  • Headache
  • Confusion
  • Decreased concentration and attention span
  • Mood swings and/or personality change
  • Intermittent loss of consciousness
  • Seizures
  • Poor coordination

Rarely, there may be a decline in brain function a few days or weeks after the event occurred. This is caused by delayed injury in the brain.

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Diagnosis  

The doctor will ask about your symptoms and medical history. A physical exam will be done. You may need to see a doctor who specializes in brain problems.

These tests may be ordered to learn the extent of the brain damage and the part of the brain that is involved:

  • Head CT scan
  • MRI scan
  • Electroencephalogram (EEG)—a test that measures the electrical activity generated by the brain
  • SPECT scans—a type of CT scan that examines areas of the brain for blood flow and metabolism
  • Evoked potential tests—tests used to evaluate the visual, auditory, and sensory pathways
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Treatment  

Initial Treatment  

Treatment of anoxic brain damage will depend on the cause. Some treatment options include:

  • Oxygen therapy to increase the amount of oxygen in the blood
  • Medication to help get adequate oxygenated blood to the brain
  • Efforts to cool the brain to help limit brain damage

Rehabilitation  

Recovery from brain damage can be uncertain. It will also take time. Your chance for recovery depends on how long and how severely you were deprived of oxygen. Many people with mild brain damage can usually recover most of the lost functions.

During rehabilitation, you and your family may work with:

  • Physical therapist—to retrain motor skills, such as walking
  • Occupational therapist—to improve daily skills, such as dressing and going to the bathroom
  • Speech therapist—to work on language problems
  • Psychologist—for behavior and emotional issues related to the injury

Recovery can take months, or even years. In many cases, full recovery is never achieved, but some can successfully learn to live with any remaining disabilities. In general, the sooner rehabilitation starts, the better the outcome.

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Prevention  

To your chance of having anoxic brain damage, take these steps:

  • Chew your food carefully
  • Learn to swim
  • Carefully supervise young children around water
  • Stay clear of high voltage electrical sources, including exposure to lightning
  • Avoid chemical toxins and illicit drugs
  • Install carbon monoxide detectors