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Controlling Epileptic Seizures: Diagnostic and Therapeutic Strategies
The image of a patient convulsing and foaming at the mouth during a seizure is deeply ingrained in the public mind. Yet are you aware that these surface symptoms alone are not sufficient to establish a diagnosis? Why do some patients undergo repeated electroencephalograms without an identifiable cause? When medication fails to control seizures, what treatment options exist beyond lifelong pharmacotherapy to relieve symptoms? From precise diagnosis to individualised treatment, how does modern medicine help patients reclaim a normal life?
A Multi-pronged Approach to Pinpointing the Cause of Epilepsy
The diagnosis of epilepsy requires a combination of investigations, with the specialist physician identifying the cause precisely through clinical history, brain imaging and neurological testing. Clinical history forms the foundation of diagnosis; the physician will ascertain the patient's seizure frequency, symptoms, duration and possible triggers in order to make a preliminary assessment of the epilepsy type.
With regard to structural brain imaging, magnetic resonance imaging (MRI) provides three-dimensional images and can precisely detect subtle structural lesions that may provoke epilepsy, such as cortical malformations, tumours or vascular abnormalities, helping to determine the source of the epilepsy and to assess surgical feasibility. In emergency situations, computed tomography (CT) may be used as an adjunct. The electroencephalogram (EEG) is an important tool for recording the brain's electrical activity and is used to identify abnormal epileptiform discharges.
If routine examination fails to capture abnormalities, a 24-hour video or sleep EEG may be performed to improve the detection rate. Even when the EEG result is negative, epilepsy cannot be entirely excluded, and a comprehensive judgement must be made in conjunction with the clinical history. In addition, blood tests can rule out metabolic causes such as electrolyte imbalance, while lumbar puncture is used when infection is suspected. Only by integrating the results of all these investigations can the physician arrive at an accurate diagnosis and formulate an individualised treatment plan.
Combining Medication and Surgery Offers Hope of Controlling Seizures
The ultimate goal of epilepsy treatment is to achieve complete control of seizures while keeping side effects to a minimum, enabling patients to enjoy a safe and normal life. The medical team will integrate strategies such as medication, surgery, lifestyle modification and social support according to the patient's specific circumstances to form an individualised treatment plan.
Antiepileptic drugs are the cornerstone of seizure control, and most patients achieve good control through a tailored medication regimen. The core aim of these drugs is to reduce the frequency and severity of seizures. Their mechanisms of action are varied, principally including stabilising over-excited neurons within the brain to reduce abnormal discharges, and regulating neurotransmitters to maintain the balance of the brain's electrical activity. In addition, many drugs can block the ion channels of nerve cells, suppressing neuronal hyperactivity and reducing the tendency of neurons to fire synchronously.
Antiepileptic drugs commonly used in clinical practice include a range of options such as carbamazepine, valproate, levetiracetam and lamotrigine, each with its own specific indications and side effects. The formulation of a treatment plan must be highly individualised; the physician will take into account the patient's seizure type, frequency, underlying cause, age and overall health in order to select the most appropriate drug and dosage. The key to successful treatment lies in the patient taking the medication regularly to maintain a stable blood drug concentration; irregular adherence is a common cause of treatment failure. At the same time, patients must attend regular follow-up so that the physician can monitor efficacy, manage side effects and adjust the medication in a timely manner.
When two or more suitable antiepileptic drugs still fail to control seizures effectively, the condition is defined as drug-resistant epilepsy, at which point the possibility of surgical intervention should be actively evaluated. In epilepsy that does not respond to medication, the lesion is most commonly located in the temporal lobe (approximately 60%), followed by the frontal lobe (20%), the parietal lobe (10%) and other regions. The type of surgery depends on the precise location of the epileptic lesion, the seizure characteristics and the patient's overall health, and can be divided principally into three categories: resective surgery, disconnective surgery and neuromodulation techniques.
Resective surgery aims to remove the epileptogenic lesion directly, eliminating the source of seizures at its root. A typical procedure such as temporal lobectomy removes part of the temporal lobe tissue to control seizures. Selective amygdalohippocampectomy is more precise, removing only the mesial temporal structures associated with seizures while preserving the surrounding neocortex as far as possible, so as to reduce the impact on cognitive function. When the lesion is clearly located and can be safely resected, this type of surgery offers a very high chance of rendering the patient completely free of seizures. In addition, laser interstitial thermal therapy is an emerging minimally invasive technique that uses laser energy to precisely ablate deep-seated or small lesions, with the advantage of a short recovery period.
Disconnective surgery prevents the spread of epileptic discharges by severing nerve fibre connections rather than removing brain tissue. Corpus callosotomy severs the main fibre bundle connecting the two cerebral hemispheres at the midline, and is used to prevent epileptic discharges from spreading to the opposite side; it is particularly effective for seizures that cause sudden falls. Multiple subpial transection interrupts the propagation pathway of epileptic discharges within critical functional areas of the cerebral cortex, controlling seizures without resecting the cortex, and provides an alternative treatment option for patients whose lesions are adjacent to important functional areas.
Neuromodulation techniques regulate neural activity through implanted neurostimulation devices. Vagus nerve stimulation involves implanting a pulse generator in the chest wall, connected to the vagus nerve in the neck, reducing cerebral excitability through electrical stimulation. Responsive neurostimulation is a closed-loop system that detects abnormal brain waves in real time and immediately delivers electrical stimulation to interrupt the seizure. Deep brain stimulation implants electrodes in specific deep brain nuclei to provide continuous electrical stimulation, modulating the excitability of the epileptic network.
Before any epilepsy surgery, a comprehensive preoperative evaluation is essential, including high-resolution magnetic resonance imaging, long-term video EEG, functional imaging and neuropsychological testing, in order to localise the epileptic lesion precisely and assess the surgical risk. The potential benefits of surgery include the possibility of complete seizure control, a marked improvement in quality of life, and a possible reduction in reliance on medication. At the same time, there are risks of surgical complications such as infection and bleeding, as well as the possibility of neurological deficits. The specialist physician will weigh these factors carefully according to the characteristics of each case and, after thorough communication with the patient and family, jointly arrive at the most appropriate treatment decision.
Beyond medication and surgery, lifestyle modification is equally indispensable in reducing seizures. Patients are advised to maintain regular sleep, to avoid personally known triggers such as alcohol, excessive fatigue and stress, and to learn to manage stress effectively through relaxation techniques. Some patients, particularly children with drug-resistant epilepsy, may try a ketogenic diet under medical supervision. Using a seizure alert device or wearing a medical identification bracelet can also provide an added measure of safety during a seizure.
MRI shows left mesial temporal sclerosis as the site responsible for the epilepsy.
Patients and their families should take the initiative to learn the relevant knowledge, including the early recognition of seizure symptoms such as muscle twitching, a fixed stare and loss of awareness.
Appropriate Support and Everyday Care: Building an Epilepsy-friendly Society
Improving society's accurate understanding of epilepsy helps to dispel prejudice and discrimination. Patients and their families should take the initiative to learn the relevant knowledge, including the early recognition of seizure symptoms such as muscle twitching, a fixed stare and loss of awareness. More importantly, one must know when to seek emergency help: for example, when a seizure lasts longer than five minutes, or when the patient experiences successive seizures without regaining consciousness, an emergency call should be made immediately. Those around the patient should also be taught correct first-aid techniques, including keeping the airway clear, helping the patient into the recovery position, protecting the head, and removing nearby hazards.
Long-term psychological and social support is likewise key to improving quality of life. Providing psychological counselling, stress management and emotional support can help patients cope with emotional difficulties such as anxiety and depression. In addition, establishing patient support groups that allow patients and families to share their experiences can effectively reduce the sense of isolation brought by the condition, ultimately helping patients live more safely and with greater dignity as they learn to live alongside epilepsy.
With the rapid development of artificial intelligence and imaging medicine, the diagnosis of epilepsy is moving towards an era of greater precision and individualisation. In the future, high-resolution EEG combined with machine-learning algorithms is expected to interpret abnormal discharge patterns automatically, and even to give warning before a seizure occurs, substantially shortening the time and manpower required by traditional interpretation.
Selective amygdalohippocampectomy.
Corpus callosotomy.
A vagus nerve stimulation device is implanted in the chest wall to stimulate the vagus nerve and reduce seizure frequency.