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Related Concept Videos

Seizures: Classification01:13

Seizures: Classification

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Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
436
Narcolepsy01:07

Narcolepsy

149
Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
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Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
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REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

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REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
RBD is significantly associated with...
267
Stages of Sleep01:22

Stages of Sleep

388
Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...
388
Arteries of the Lower Limbs01:24

Arteries of the Lower Limbs

217
Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...
217

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First seizure from sleep: Clinical features and prognosis.

Nicholas D Lawn1, Elaine W Pang1, Judy Lee1

  • 1Western Australian Adult Epilepsy Service, Perth, Western Australia, Australia.

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Summary

First-ever unprovoked seizures occurring during sleep are more likely to recur than those occurring while awake. Recurrences are often also from sleep and associated with less injury, informing patient management.

Keywords:
first seizureprognosissleep

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Area of Science:

  • Neurology
  • Clinical Neuroscience

Background:

  • First-ever unprovoked seizures require accurate prediction of recurrence for effective patient management.
  • Established predictors of seizure recurrence include prior brain insult and epileptiform abnormalities on electroencephalography (EEG).
  • The role of sleep onset in seizure recurrence risk requires further investigation.

Purpose of the Study:

  • To investigate the association between first-ever unprovoked seizures occurring during sleep versus while awake and seizure recurrence.
  • To identify if sleep-onset seizures are an independent predictor of recurrence.
  • To compare injury risk and recurrence patterns between sleep and awake seizures.

Main Methods:

  • Prospective cohort study of 1312 adults with a first-ever unprovoked seizure between 2000 and 2015.
  • Comparison of clinical features and outcomes for seizures occurring during sleep versus while awake.
  • Survival analysis to determine independent predictors of seizure recurrence.

Main Results:

  • First-ever seizures during sleep occurred in 23% of patients and had a significantly higher 1-year recurrence risk (56.9%) compared to awake seizures (44.2%).
  • Seizures from sleep were an independent predictor of recurrence (HR 1.44), similar to EEG abnormalities and remote symptomatic etiology.
  • Recurrences of sleep-onset seizures were also typically from sleep (76% of second seizures) and associated with lower injury rates.

Conclusions:

  • First-ever unprovoked seizures originating from sleep are associated with a higher likelihood of recurrence, independent of other known risk factors.
  • Subsequent seizures following a sleep-onset event are also likely to occur during sleep.
  • These findings have implications for treatment decisions and patient counseling following a first seizure.