What you need to know about traumatic brain injuries

Traumatic brain injury (TBI) occurs when an external force, such as a violent blow, damages the brain. Depending on the severity of the injury, this could end in serious long-term damage or even death. Centers for Disease Control and Prevention report that about 1.7 million people will experience a TBI each year.

Brain injury The Individuals with Disabilities Education Act (IDEA) is the special education law in the United States. It defines TBI as "an acquired injury to the brain caused by an external physical force, resulting in total or partial functional disability or psychosocial impairment."

Ricardo Jorge Komotar, neurological surgeon at the University of Miami School of Medicine, said that people should know about the chronic nature of the condition. "Most of the focus is on concussions but people need to understand that there are repercussions 10 to 15 years down the road, not just right now."

Frank Toral, senior partner at Toral Garcia Battista (a brain and spinal cord injury law firm), explained that TBI the leading cause of death anddisabilityfor children 14 and under.

Causes There are two basic forms of TBI: Closed head injuries (blows to the head) and penetrating injuries (penetration of brain by foreign object). One can receive TBI from acts of violence, sports injuries, blasts during combat or falls, reports the Mayo Clinic.

Damage An external physical blow can damage brain cells, cause the brain to push harshly against the skull, tearing internal structures or causing internal bleeding.

The American Speech-Language-Hearing Association reports that primary brain damage (which is complete at time of impact) can include skull fractures, contusions, blood clots, tearing of the lobes or blood vessels and nerve damage. Secondary damage (which evolves over time after impact) can include brain swelling, epilepsy, fever, infection, extreme blood pressure, anemia and more.

Sections Owing to the brain's intricacy, the complications are predicated upon the particular section harmed. Scientists separate the brain into various lobes: frontal lobe, temporal lobe, parietal lobe, occipital lobe, the cerebellum and the brain stem--each responsible for particular functions.

The Brain Injury Association of America explains, for instance, that the occipital lobe controls vision, whereas the cerebellum controls balance, motor activity and coordination. However, these sections are not mutually exclusive and responsibilities may overlap, as visual perception is partially controlled by the cerebellum.

Diagnosis To assess the severity of the injury, doctors gauge the patient's capabilities to follow directions on the 15-point Glasgow Coma Scale. If medical personnel are responding in the immediate aftermath of the blow, they will interview witnesses to uncover specifics, such as how long the person has been unconscious, where the head was struck and how the injury occurred, among other details.

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What you need to know about traumatic brain injuries