Overview 

Traumatic brain injury (TBI) occurs when an external force damages the brain. This injury can result from various incidents, such as a blow, bump, or jolt to the head, or from a penetrating injury. The severity of TBIs varies widely, ranging from mild concussions to severe injuries that can lead to long-term complications or even death.¹

The cause of TBIs can vary but some of the most common types include: 

• Falls: This is the leading cause of TBIs; older people as well as young children are especially prone to this
• Motor vehicle accidents: Collisions involving cars, motorcycles, bicycles or pedestrians can frequently lead to TBIs due to forceful impact
• Sports injuries: TBIs can commonly be seen in contact sports such as rugby or boxing, where high impact increases the chance of injury
• Physical assaults: Violence such as being struck by an object in the head can directly cause TBIs (Mayo Clinic)

Early diagnosis and treatment of traumatic brain injury are crucial for several reasons. Primarily, they help prevent further brain damage and limit the extent of harm caused by the initial injury. Additionally, prompt intervention improves recovery outcomes and significantly reduces the risk of mortality.¹

Types of traumatic brain injury

Traumatic brain injuries (TBIs) can be categorized based on their cause, symptoms, or severity. Some types of TBIs may result in temporary or short-term disruptions to brain function, while others are more severe and can lead to permanent disability or even death.¹

The type of TBI is typically defined by the cause of the brain injury and can be broadly classified into two categories: penetrating and non-penetrating injuries.¹

Concussions

A concussion is a mild form of TBI resulting from non-penetrating head injuries. The abrupt impact causes the brain to bounce within the skull, leading to either a brief loss of consciousness or an altered state of awareness. Common symptoms of a concussion include headaches, confusion, dizziness, and occasionally memory problems.¹ 

Contusions

Contusions are another type of TBI characterized by bruising of the brain tissue. Like concussions, contusions result from non-penetrating injuries but involve localized bleeding and swelling in the brain due to direct impact. Contusions can vary in severity and often lead to more serious symptoms than concussions, including prolonged loss of consciousness, severe headaches, nausea, and neurological deficits.¹

Diffuse axonal injuries

Diffuse axonal injuries (DAIs) are a severe form of TBI that occur when the brain rapidly shifts inside the skull during acceleration or deceleration. This movement causes widespread damage to the brain’s white matter, tearing the connecting fibres between brain cells. Like concussions and contusions, DAIs result from non-penetrating injuries. Common symptoms of DAIs include loss of consciousness, coma, persistent vegetative state, cognitive impairments, and motor deficits, among others.¹

Hematomas

Hematomas are collections of blood that form outside blood vessels around the brain. This accumulation can increase intracranial pressure, potentially leading to brain damage. Hematomas can result from both penetrating and non-penetrating injuries and are typically categorized as subdural, epidural, or intracerebral. Symptoms often overlap with other types of brain injuries and may include headaches, confusion or altered mental state, dizziness, nausea, and, in severe cases, seizures.¹

Penetrating brain injuries

Penetrating brain injuries (PBIs) occur when an object, such as a bullet, knife, or shrapnel, pierces the skull and enters the brain tissue. While the severity of PBIs can vary, they are often quite severe due to the direct damage to brain structures, blood vessels, and nerves caused by the penetrating object. Symptoms depend on the affected area of the brain, but common signs include severe headaches, loss of consciousness, seizures, cognitive and motor deficits, and bleeding from the head or nose.²

Diagnosis of traumatic brain injury

TBIs can be diagnosed through a combination of physical examinations, neurological assessments, imaging tests and in rare cases laboratory tests (Mayo Clinic). 

Initial assessment

The initial assessment of a TBI begins with a medical history and symptom review, where the healthcare provider gathers details about the injury event, current symptoms, and any previous head injuries. The Glasgow Coma Scale (GCS) is then used to evaluate the level of consciousness, based on eye-opening, verbal responses, and motor responses. Scores range from 3 to 15, with lower scores indicating more severe injuries (Mayo Clinic). 

Imaging techniques

Imaging techniques play a key role in diagnosing and assessing the severity of TBIs. The most commonly used imaging methods include the following: 

Computed tomography (CT) scan

CT scans are commonly the initial imaging test performed when a traumatic brain injury (TBI) is suspected. By utilizing X-rays, CT scans generate detailed cross-sectional images of the brain, allowing for the rapid identification of skull fractures, hematomas, contusions, brain swelling, and other structural injuries (Mayo Clinic).  The key advantages of CT scans include their speed, widespread availability, and effectiveness in detecting acute brain injuries. However, their limitations lie in resolution and the ability to detect subtle or diffuse injuries.³

Magnetic resonance imaging (MRI)

MRIs are a valuable imaging technique for diagnosing TBIs, particularly when a more detailed assessment is needed after a CT scan yields inconclusive results. By using powerful magnets and radio waves, MRIs create highly detailed images of the brain’s soft tissues. This makes them especially effective for detecting diffuse axonal injuries, small contusions, brain stem injuries, and other subtle abnormalities (Mayo Clinic).  Compared to CT scans, MRIs offer the advantage of providing a more detailed view of the brain's structures, allowing for the detection of smaller injuries. However, MRIs are more time-consuming and less widely available than CT scans, which can limit their use in some situations (Cleveland Clinic). 

Neurological examination

Neurological examinations are essential in evaluating TBIs, as they assess the impact of the injury on the brain and nervous system, guiding further diagnostic testing and treatment.⁴ A typical neurological examination includes the following key elements:

• Assessment of mental status
• Cranial nerve examination 
• Motor function tests 
• Reflex examinations 
• Sensory Function Examination⁵

Biomarkers and blood tests

Biomarkers and blood tests are emerging tools in the diagnosis and management of TBIs. These tests can offer valuable insights into the extent of brain damage, aid in monitoring recovery, potentially predict long-term outcomes, and may reduce the need for imaging in certain cases. ⁶

Treatment of traumatic brain injury 

The treatment of TBIs often depends on the severity of the injury, ranging from mild to severe. The goal of the treatment is to stabilize the patient, prevent further brain damage, and promote recovery (Mayo Clinic). 

Acute management

Acute management of TBIs focuses on addressing the immediate life-threatening conditions. This phase of treatment typically occurs in an emergency department or intensive care unit and involves a coordinated multidisciplinary approach, in severe cases leading to immediate surgical intervention. ⁷

Surgical intervention

Surgical intervention plays a crucial role in treating TBIs, especially in severe cases where prompt action is necessary to prevent further brain damage or address life-threatening conditions. The decision to perform surgery depends on the type, location, and severity of the injury, as well as the patient’s overall health. Additionally, surgical procedures are particularly effective for removing hematomas and alleviating pressure on the brain.⁷

Medical management

Medical management of TBIs focuses on stabilizing the patient, preventing secondary brain injury and supporting the recovery through non-surgical interventions. This approach is essential both immediately after the injury and throughout the recovery process (Mayo Clinic). 

Medications

Medications for TBIs are mainly used to manage symptoms, prevent complications and support recovery. The medication choice depends on the type and severity of the injury as well as the specific needs of the patient (Mayo Clinic).  Some of the medications administered are as follows:  

• Osmotic diuretics: The purpose of these is to reduce intracranial pressure by drawing the fluid out of the brain and into the bloodstream⁸
• Anticonvulsants: These prevent and control seizures that can be caused by severe TBIs⁹
• Sedatives and analgesics: These provide sedation and pain relief for those who are agitated or in severe pain¹⁰
• Anti-hypertensives: These are used to manage elevated blood pressure which is critical for preventing secondary brain injury¹¹

Long-term management and follow-up 

Long-term management and follow-up care are essential for individuals recovering from TBIs, as they help address persistent symptoms, enhance recovery, and improve overall quality of life. This phase of care encompasses a comprehensive approach that includes cognitive, physical, emotional, and social rehabilitation.¹²

Summary 

Traumatic brain injury (TBI) occurs when an external force damages the brain, resulting from incidents such as falls, motor vehicle accidents, sports injuries, or physical assaults. TBIs can range from mild concussions to severe injuries with long-term complications. Early diagnosis and treatment are vital to prevent further damage, improve recovery, and reduce mortality. Diagnosis involves a combination of medical history, neurological assessments, imaging techniques like CT and MRI, and emerging biomarkers. Treatment strategies depend on the injury's severity and include acute management, surgical interventions for severe cases, and medical management with medications to address symptoms and prevent complications. Long-term management focuses on comprehensive rehabilitation, addressing cognitive, physical, emotional, and social aspects to enhance recovery and quality of life.