WHAT CAUSES COMA IN HEAD INJURED PEOPLE?
Coma in head injured people almost always results from injury to all parts of the brain, not just the brain stem. In very rare circumstances the major portion of the brain is spared and only the brain stem is injured. This may result in prolonged coma with rapid and nearly complete recovery when the head injured person wakes up. In the vast majority of cases, however, prolonged coma implies diffuse injury to all parts of the brain, including the brain stem, and recovery is slow. Residual effects of brain stem injury may include prolonged difficulty with movements, vision, swallowing and other functions controlled by the brain stem. Residual effects of injury to the other parts of the brain may include problems with movement, memory, attention, speed of thinking, complex thinking, speech and language, and behavior and personality.