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Temporal Lobe Seizures

The brain contains two temporal lobes, one on each side of the brain. The temporal lobes are responsible for processing auditory information, managing emotions, storing memories, and understanding language.

As its name suggests, a temporal lobe seizure is a seizure that originates in one of the temporal lobes of the brain. Temporal lobe seizures are the most common type of seizure for those suffering from a seizure disorder.

Symptoms

For some, the first symptom of a temporal lobe seizure is an aura. An aura takes place anywhere from several seconds to an hour before the seizure occurs. Because of this, an aura is a useful warning that a seizure is imminent.

Auras can be quite diverse and hard to describe. Examples of common auras are listed below:

  • Sudden feeling of joy, fear, panic, or anxiety
  • Recalled memory
  • Flashing lights, swirling colours, or other visual hallucination
  • Unusual buzzing sound or other auditory hallucination
  • Unusual smell or taste
  • Sense of déjà vu
  • Rising sensation in the belly
  • Feeling of butterflies with nausea

After an aura comes the seizure. Most people believe seizures are just convulsions and jerking motions. On the contrary, temporal lobe seizures can appear quite differently. The symptoms of a temporal lobe seizure include the following:

  • Loss of consciousness or awareness
  • Temporary confusion
  • Staring blankly into space
  • Speaking gibberish
  • Lip smacking
  • Repetitive swallowing
  • Repetitive chewing
  • Unusual finger movements

One should immediately seek help if any of the following happens:

  • The seizure lasts longer than five minutes
  • The seizure is immediately followed by a second seizure
  • One does not regain consciousness after the seizure
  • One is pregnant at the time of the seizure

Causes

A temporal lobe seizure is caused by uncontrolled bursts of electrical activity within the temporal lobe of the brain. For many, the cause for this abnormal electrical activity remains unknown. For others, their temporal lobe seizures may be caused by any of the conditions listed below:

  • Genetics
  • Head trauma
  • Oxygen deprivation at birth
  • Prolonged or frequent febrile seizures
  • Degenerative brain disease (i.e., Alzheimer’s or dementia)
  • Stroke
  • Drug use
  • Alcohol abuse
  • Infection (i.e., meningitis, cysticercosis, HIV, or encephalitis)
  • Electrolyte problem (i.e., hyponatremia)
  • Metabolic problem (i.e., hyperglycaemia or hypoglycaemia)
  • Eclampsia
  • Structural abnormalities within the brain (i.e., hippocampal sclerosis)

Reference Articles

Risk Factors

Three risk factors for the development of temporal lobe seizures are:

  • History of febrile seizures – A febrile seizure is a seizure caused by a fever. Febrile seizures are most common in children between the ages of six months and five years. Having a history of febrile seizures in one’s youth is linked to the development of temporal lobe seizures later in life.
  • History of infections – Certain infections have lasting effects on the brain. Examples include encephalitis, meningitis, cysticercosis, and HIV.
  • Brain damage – One of the most apparent causes of brain damage is head trauma. However, there are several other conditions that lead to brain damage. Examples include oxygen deprivation, stroke, degenerative brain disease, drug use, and alcohol abuse. Having brain damage due to any of these conditions increases one’s chances for developing temporal lobe seizures.

Diagnosis

A neurologist is a special type of doctor who diagnoses and treats temporal lobe seizures. To reach a diagnosis, the neurologist will first ask the patient to describe their seizure in as much detail as possible. This includes any details of what preceded the seizure (i.e., an aura) and what transpired afterwards. If possible, the neurologist will consult with anyone who witnessed the seizure. Video recordings are also beneficial for diagnosis.

A neurologist also relies on various brain imaging techniques to diagnose temporal lobe seizures. These brain imaging techniques include the following: CT scan, MRI, fMRI, PET scan, SPECT test, SISCOM, and MEG.

Complications

If left untreated, temporal lobe seizures can lead to the following complications:

  • Injuries incurred during a seizure (i.e., from falling or being in a car accident)
  • Mood disorders
  • Memory problems
  • Social isolation
  • Status epilepticus

Treatment

The majority of those who suffer from temporal lobe seizures can achieve complete control of their seizures through medication. However, there are some who cannot rely on medication alone. In these cases, other treatment options may be considered. They include the following:

  • Surgery
  • Vagus nerve stimulation (VNS)
  • Deep brain stimulation (DBS)
  • Responsive neurostimulation (RNS)
  • Ketogenic diet

Antiseizure medication is successful in preventing seizures in roughly two-thirds of people with temporal lobe seizures.  For the remaining third, surgery helps about 70% become free of seizures.  Some antiseizure medications have been linked to birth defects, let your doctor know if you are pregnant or planning to become pregnant.

 
 
 

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