Overview
Traumatic brain injury (TBI) is a significant public health concern, affecting millions of individuals worldwide. TBI can result from various causes, including falls, motor vehicle accidents, sports-related injuries, and violence. While the primary focus is often on the immediate consequences of TBI, such as cognitive impairments, motor deficits, and emotional disturbances, one of the potential long-term complications is the development of seizures.
Introduction to traumatic brain injury and seizures
TBI is a disruption in the normal functioning of the brain caused by an external force, such as a blow to the head or a penetrating injury. The severity of TBI can range from mild (concussion) to severe, with the latter often resulting in significant neurological deficits and long-term disabilities. One of the potential consequences of TBI is the development of seizures, which are abnormal electrical discharges in the brain that can manifest as various physical symptoms, including convulsions, loss of consciousness, and altered behaviour.
Seizures following TBI can occur in different forms, including early post-traumatic seizures (occurring within the first week after injury) and late post-traumatic seizures (occurring after the first week).1 The risk of developing seizures after TBI is influenced by several factors, including the severity of the injury, the location of the brain damage, and the presence of specific risk factors.
Risk factors for seizures following traumatic brain injury
Several risk factors have been identified as contributing to the development of seizures after TBI. Understanding these risk factors is crucial for early identification and appropriate management of seizures in TBI patients. Risk factors include:
- Severity of TBI - The risk of developing seizures increases with the severity of the TBI. Patients with severe TBI, characterised by prolonged loss of consciousness, intracranial haemorrhage, or penetrating brain injuries, have a higher risk of developing seizures compared to those with mild or moderate TBI2
- Intracranial haemorrhage - The presence of intracranial haemorrhages, such as subdural hematoma, epidural hematoma, or intracerebral haemorrhage is a significant risk factor for post-traumatic seizures. The risk is particularly high in cases of acute subdural haematoma
- Penetrating brain injury - Penetrating brain injuries, such as gunshot wounds or other penetrating objects, are associated with a higher risk of developing seizures compared to closed-head injuries3
- Cortical contusion and intracranial haemorrhage - Contusions or bruising of the brain's cortex and the presence of intracranial haemorrhage (bleeding within the skull) are associated with an increased risk of post-traumatic seizures. These injuries can lead to disruptions in the brain's normal electrical activity, predisposing individuals to seizures3
- Age - Both younger and older age groups have been associated with an increased risk of developing seizures after TBI. Children and elderly individuals are more susceptible to post-traumatic seizures compared to adults4
- Genetic factors - Certain genetic factors, such as mutations in ion channel genes or genes involved in neurotransmitter regulation may predispose individuals to developing seizures after TBI5
- Previous history of seizures - Individuals with a pre-existing history of seizures or epilepsy have a higher risk of developing post-traumatic seizures compared to those without such a history
Management of seizures following traumatic brain injury
The management of seizures following TBI involves a multidisciplinary approach, combining pharmacological interventions, surgical options, and supportive care. The specific treatment plan is tailored to the individual patient's needs and the characteristics of the seizures.
Pharmacological management
Antiepileptic drugs (AEDs) are the mainstay of treatment for post-traumatic seizures. Common AEDs in this context include levetiracetam, valproic acid, phenytoin, and carbamazepine. The choice of AED depends on factors such as the type of seizures, potential side effects, and drug interactions.6
Prophylactic treatment
In some cases, prophylactic treatment with AEDs may be initiated in the acute phase following TBI to prevent the development of early post-traumatic seizures. However, the use of prophylactic AEDs remains controversial, and the decision should be based on individual risk factors and potential benefits.7
Surgical management
Respective surgery
In cases where seizures are refractory to medical management or when a specific structural lesion is identified as the cause of seizures, surgical intervention may be considered. This can involve resectioning the epileptogenic focus (the area of the brain responsible for generating seizures) or implantation of a vagus nerve stimulator, which can help reduce seizure frequency.8
Vagus nerve stimulation (VNS)
VNS is a neuromodulation technique that involves implanting a device that delivers electrical stimulation to the vagus nerve. It is effective in reducing the frequency and severity of seizures in some patients with post-traumatic epilepsy.
Supportive care
Rehabilitation
Comprehensive rehabilitation programs, including physical therapy, occupational therapy, speech therapy, and cognitive rehabilitation, play a crucial role in improving functional outcomes and quality of life for individuals with post-traumatic seizures.9
Lifestyle modifications
Lifestyle modifications, such as stress management, adequate sleep, and avoidance of potential seizure triggers (alcohol and sleep deprivation), can help reduce the risk of seizure recurrence.10
Psychosocial support
Individuals with post-traumatic seizures may experience psychological and social challenges, such as anxiety, depression, and stigma. Providing psychosocial support through counselling, support groups, and educational resources is essential for overall well-being.9
FAQs
What is the risk of developing seizures after a traumatic brain injury?
The risk of developing seizures after a traumatic brain injury varies depending on the severity of the injury. The estimated incidence ranges from 4% to 25% in patients with moderate to severe TBI.11
What are the potential mechanisms underlying the development of seizures after a traumatic brain injury?
The potential mechanisms include disruption of the blood-brain barrier, neuronal injury and excitotoxicity, neuroinflammation, and structural and functional changes in the brain.12
What is the prognosis and long-term outcome for traumatic brain injury patients with seizures?
The prognosis and long-term outcomes for traumatic brain injury patients with seizures can vary depending on factors such as the severity of the injury, the type and frequency of seizures, and the effectiveness of treatment. Early recognition and appropriate management of seizures are crucial for improving outcomes and reducing the risk of further complications.
Summary
Traumatic brain injuries can have long-lasting consequences, including the development of seizures. Understanding the risk factors associated with post-traumatic seizures is crucial for early identification and appropriate management. Factors such as the severity of TBI, intracranial haemorrhage, penetrating brain injury, cortical contusion, age, genetic factors, and previous history of seizures contribute to the increased risk of developing seizures after TBI.
The management of seizures following TBI involves a multidisciplinary approach, combining pharmacological interventions with AEDs, surgical options like resective surgery or VNS, and supportive care through rehabilitation, lifestyle modifications, and psychosocial support. Early recognition and prompt treatment of post-traumatic seizures are essential to minimise the impact on functional outcomes and quality of life.
Ongoing research efforts are focused on improving our understanding of the underlying mechanisms of post-traumatic seizures, identifying novel therapeutic targets, and developing more effective treatment strategies. Collaboration among healthcare professionals, researchers, and patient advocacy groups is crucial to advancing the care and support for individuals affected by this challenging condition
References
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- Salazar AM, Jabbari B, Vance SC, Grafman J, Amin D, Dillon JD. Epilepsy after penetrating head injury. I. Clinical correlates: A report of the Vietnam Head Injury Study. Neurology [Internet]. 1985 [cited 2024 Jun 7]; 35(10):1406–1406. Available from: https://www.neurology.org/doi/10.1212/WNL.35.10.1406.
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- Oyrer J, Maljevic S, Scheffer IE, Berkovic SF, Petrou S, Reid CA. Ion Channels in Genetic Epilepsy: From Genes and Mechanisms to Disease-Targeted Therapies. Pharmacol Rev [Internet]. 2018 [cited 2024 Jun 7]; 70(1):142–73. Available from: http://pharmrev.aspetjournals.org/lookup/doi/10.1124/pr.117.014456.
- Metcalf CS, Radwanski PB, Bealer SL. Status epilepticus produces chronic alterations in cardiac sympathovagal balance. Epilepsia [Internet]. 2009 [cited 2024 Jun 7]; 50(4):747–54. Available from: https://onlinelibrary.wiley.com/doi/10.1111/j.1528-1167.2008.01764.x.
- Chang BS, Lowenstein DH. Practice parameter: Antiepileptic drug prophylaxis in severe traumatic brain injury: Report of the Quality Standards Subcommittee of the American Academy of Neurology. Neurology [Internet]. 2003 [cited 2024 Jun 7]; 60(1):10–6. Available from: https://www.neurology.org/doi/10.1212/01.WNL.0000031432.05543.14.
- Englot DJ, Chang EF, Vecht CJ. Epilepsy and brain tumors. In: Handbook of Clinical Neurology [Internet]. Elsevier; 2016 [cited 2024 Jun 7]; bk. 134, p. 267–85. Available from: https://linkinghub.elsevier.com/retrieve/pii/B9780128029978000165.
- Ponsford J, Willmott C, Rothwell A, Cameron P, Kelly A-M, Nelms R, et al. Factors influencing outcome following mild traumatic brain injury in adults. J Int Neuropsychol Soc [Internet]. 2000 [cited 2024 Jun 7]; 6(5):568–79. Available from: https://www.cambridge.org/core/product/identifier/S1355617700655066/type/journal_article.
- Qin W, Haroutunian V, Katsel P, Cardozo CP, Ho L, Buxbaum JD, et al. PGC-1α Expression Decreases in the Alzheimer Disease Brain as a Function of Dementia. Arch Neurol [Internet]. 2009 [cited 2024 Jun 7]; 66(3). Available from: http://archneur.jamanetwork.com/article.aspx?doi=10.1001/archneurol.2008.588.
- Watanitanon A, Lyons VH, Lele AV, Krishnamoorthy V, Chaikittisilpa N, Chandee T, et al. Clinical Epidemiology of Adults with Moderate Traumatic Brain Injury. Crit Care Med [Internet]. 2018 [cited 2024 Dec 4]; 46(5):781–7. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5899009/.
- Yang C, Hawkins KE, Doré S, Candelario-Jalil E. Neuroinflammatory mechanisms of blood-brain barrier damage in ischemic stroke. Am J Physiol Cell Physiol [Internet]. 2019 [cited 2024 Dec 4]; 316(2):C135–53. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6397344/.
