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Traumatic Brain Injury (TBI) - Causes, Symptoms & Treatment
Traumatic brain injury (TBI) is a brain injury caused by an external force to the head. Depending on severity, consequences range from brief loss of consciousness to permanent neurological damage.
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Traumatic brain injury (TBI) is a brain injury caused by an external force to the head. Depending on severity, consequences range from brief loss of consciousness to permanent neurological damage.
What is Traumatic Brain Injury?
Traumatic brain injury (TBI) refers to damage to the brain resulting from a direct or indirect external force applied to the head. This can affect brain tissue, blood vessels, or cranial nerves. TBI is one of the most common neurological emergencies worldwide and can affect people of all ages.
Causes
The most common causes of traumatic brain injury include:
- Falls: especially common in older adults and young children
- Road traffic accidents: including bicycle, motorcycle, and car accidents
- Sports injuries: e.g. skiing, football, or contact sports
- Physical assault: e.g. blows to the head
- Workplace accidents: e.g. falling objects
Severity Levels
TBI is classified into three severity levels using the Glasgow Coma Scale (GCS):
- Mild TBI (GCS 13-15): also known as concussion; brief loss of consciousness or confusion may occur, symptoms usually resolve fully
- Moderate TBI (GCS 9-12): longer loss of consciousness, more pronounced neurological deficits possible
- Severe TBI (GCS 3-8): deep coma, life-threatening conditions, high risk of permanent damage
Symptoms
Symptoms of TBI vary greatly depending on severity. Common signs include:
- Headache and dizziness
- Nausea and vomiting
- Loss of consciousness or confusion
- Memory gaps (amnesia)
- Vision, hearing, or speech disturbances
- Balance problems
- Changes in personality or behavior
- Seizures
Diagnosis
The diagnosis of TBI is established through a combination of:
- Neurological examination: assessment of consciousness, reflexes, and motor skills
- Computed tomography (CT scan): standard method for rapid detection of bleeding, fractures, or brain swelling
- Magnetic resonance imaging (MRI): more detailed visualization of brain tissue damage, especially in mild TBI
- Glasgow Coma Scale: standardized assessment of the level of consciousness
Treatment
Emergency Care
If TBI is suspected, emergency services must be called immediately. Until help arrives, the person should be kept still and monitored. If unconscious but breathing, the recovery position is recommended.
Hospital Treatment
Mild TBI is often treated on an outpatient basis or with short inpatient observation. Moderate and severe TBI require intensive medical care, which may include:
- Intensive care monitoring: controlling intracranial pressure, oxygen supply, and circulatory function
- Medication: e.g. pain relievers, drugs to reduce intracranial pressure, or antiepileptics
- Surgical intervention: e.g. removal of blood clots (hematomas) or decompression of the brain
Rehabilitation
After a severe TBI, a lengthy rehabilitation process is often necessary. This may include physiotherapy, occupational therapy, speech therapy, and neuropsychological therapy to help regain or compensate for lost abilities.
Prevention
Many traumatic brain injuries can be prevented with appropriate protective measures:
- Wearing a helmet when cycling, skiing, or participating in other high-risk sports
- Using a seatbelt in vehicles
- Fall prevention in older adults (e.g. grab bars, non-slip mats)
- Safe design of play areas for children
References
- World Health Organization (WHO): Traumatic Brain Injury. Available at: https://www.who.int/news-room/fact-sheets/detail/traumatic-brain-injury
- Maas AIR et al. - Traumatic brain injury: integrated approaches to improve prevention, clinical care, and research. The Lancet Neurology, 2017;16(12):987-1048.
- Centers for Disease Control and Prevention (CDC): Traumatic Brain Injury and Concussion. Available at: https://www.cdc.gov/traumaticbraininjury
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