Introduction 

Seizures

A seizure occurs when brain cells malfunction and send electrical signals uncontrollably, causing a domino effect where more neurons start misfiring. This electrical overload disrupts brain function. Neurons form electrical networks, much like roads and traffic lights in a city, and seizures are akin to these lights short-circuiting. Historically, seizures were thought to be caused by evil spirits, but modern medicine reveals that anyone can experience seizures, though some are more prone to them than others.¹

Seizures are sudden, temporary bursts of electrical activity in the brain that disrupt normal communication between brain cells, leading to involuntary changes in movement, sensation, behavior, or awareness. While every brain has the potential for seizures, individuals with epilepsy have a lower seizure threshold, making them more likely to experience seizures than those without epilepsy. It's important to distinguish between seizures and epilepsy: a seizure is an event and can be a symptom of various medical conditions, whereas epilepsy is a chronic disorder characterized by recurrent seizures.

Seizures can occur either early, within the first week after a brain injury, or late, more than a week after the injury. Early seizures are considered symptoms of recent brain trauma. In contrast, late seizures are more likely to be recurrent and may lead to the development of epilepsy.²

Provoked seizures

Provoked seizures occur due to an identifiable physical cause, such as an acute medical illness, metabolic imbalances like abnormal blood sugar levels, fever, head injuries, strokes, or substance withdrawal. These seizures are distinct from epilepsy, as they are triggered by specific events or conditions affecting the brain rather than chronic neurological conditions. Treating provoked seizures involves addressing the underlying cause. Unlike epilepsy, which is characterized by recurrent seizures without an immediate external trigger, provoked seizures are responses to temporary or acute factors. Additionally, some events, such as syncope or migraines, can mimic seizures but do not involve the same brain electrical activity changes seen in epilepsy.

Risks

After a traumatic brain injury (TBI), several complications can arise. Altered states of consciousness, such as coma, vegetative state, and minimally conscious state, can occur, with brain death being irreversible. Physical complications include seizures, fluid buildup in the brain (hydrocephalus), infections, blood vessel damage, headaches, and vertigo. Cranial nerve damage can lead to facial paralysis, sensory loss, and vision problems. Cognitive and communication difficulties may involve memory, learning, reasoning, and speech issues. Behavioral and emotional changes, such as self-control problems, risky behavior, depression, and anxiety, are common. Sensory problems like ringing in the ears and balance issues, along with potential risks of degenerative brain diseases, such as Alzheimer's and Parkinson's, further complicate recovery and quality of life.³

Seizures occur when neurons start firing electrical signals uncontrollably, triggering more neurons to misfire. Frequent malfunctions can alter brain cell function, making seizures more likely. If seizures persist or last too long, they can damage brain cells and potentially cause permanent brain damage. Seizures can also disrupt blood chemistry, leading to further brain damage. Generalized seizures affect both brain hemispheres and are usually more severe, while focal seizures impact only one hemisphere and one side of the body but can sometimes spread and become generalized.¹

In a population of individuals with epilepsy, around 5% of new cases and about 20% of existing cases can be attributed to a previous traumatic brain injury (TBI). The overall incidence of epilepsy is lowest among adults aged 25 to 65. This age group has typically passed through childhood and adolescence without developing epilepsy due to genetic, developmental, or perinatal factors, and they have not yet reached the age where cerebrovascular or degenerative diseases become more prevalent.⁴

Seizures often cause unconsciousness, posing risks like falling or accidents during activities such as driving. Some people experience an “aura” before a seizure, which is a symptom of a focal seizure affecting one side. If the seizure doesn't spread, the aura is the only effect. If it does spread, the aura serves as a warning of a more severe seizure. Auras vary, causing sensory symptoms (like seeing bright lights or hearing sounds), emotional changes (such as fear or joy), and autonomic symptoms (like sweating or drooling). A common aura symptom is “gastric uprising,” a rising feeling in the stomach.¹

The structural, chemical, and functional brain changes that can cause seizures after a TBI are still under study. These changes depend on the trauma type. Closed head injuries can lead to brain bleeding, bruising, shearing injuries to white matter, brain swelling, and reduced blood flow. Chemical changes affecting brain cell function also occur post-TBI. Penetrating injuries can cause scars in brain tissue or on the brain's outer layer and coverings. Researchers are exploring electrophysiologic, imaging, blood, and cerebrospinal fluid biomarkers to better understand these post-TBI brain changes and their link to seizures.²

Management

Treating the underlying cause of provoked seizures often stops them. If the condition isn’t treatable, doctors may suggest medications to lessen seizure frequency and severity. Generally, doctors avoid treating first-time unprovoked seizures unless there's a high risk of recurrence or the person has status epilepticus, a severe condition needing immediate intervention to prevent brain damage or death. Medical history and tests like EEG, CT, or MRI can help assess seizure risk.¹

Treatment

Epilepsy seizures can be treated with medications, surgery, diet changes, brain stimulation, or vagal nerve stimulation. Self-diagnosing or treating seizures is not recommended, as they often indicate serious medical conditions. If you or a loved one has a first-time seizure, consult a healthcare provider who can guide you on the necessary steps post-seizure. If someone has a seizure, ensure they can breathe by loosening tight clothing, move dangerous objects away, turn them on their side to aid breathing, time the seizure, and stay with them to provide reassurance. Avoid restraining them or putting anything in their mouth, and remain calm. Seek emergency help if the seizure is prolonged or if they have status epilepticus.¹

Anti-seizure medications (ASMs) are the primary treatment for seizures after a TBI. They are typically prescribed if a person experiences even a single seizure shortly after the injury, aiming to prevent status epilepticus. Quick seizure control is crucial to minimize further brain damage. The duration of ASM treatment varies based on the injury's severity and the risk of recurrent seizures. For late-onset seizures (occurring more than a week post-injury), long-term anticonvulsant treatment is usually recommended due to the high recurrence rate. The choice of medication depends on the type of seizures and the individual's medical history.²

Summary

Seizures can arise from uncontrolled electrical activity in the brain, disrupting normal communication between neurons. Post-traumatic seizures can occur early or late after a brain injury, with late seizures more likely to lead to epilepsy. Provoked seizures are triggered by identifiable physical causes, such as illness or trauma, and require treatment targeting the underlying cause. Traumatic brain injuries can result in various complications, including seizures, altered consciousness, and cognitive, physical, and sensory problems. Effective management involves antiseizure medications and addressing the underlying causes. Recognizing symptoms and consulting healthcare providers for proper diagnosis and treatment is crucial. Researchers continue to explore biomarkers and brain changes to better understand and treat seizures following traumatic brain injuries.

FAQs

Is it possible to recover the brain after injuries?

According to most current studies, once brain cells are destroyed or damaged, for the most part, they do not regenerate.

Who is most at risk for TBI?

The greatest risk of traumatic brain injury is present in children, especially newborns to 4-year-olds.

What is the prognosis for a traumatic brain injury? 

Although hospitalization and inpatient rehabilitation services are available, approximately 50% of people with TBI will experience further impairment in their daily life or die within 5 years of their traumatic brain injury.