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Asymmetric POSTS associated with unilateral EEG abnormalities.

S Aybek1, M Maeder-Ingvar, P-A Despland

  • 1Service de neurologie, université de Lausanne, CHU Vaudois, Lausanne, Switzerland.

Neurophysiologie Clinique = Clinical Neurophysiology
|May 27, 2009
PubMed
Summary
This summary is machine-generated.

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Asymmetric Positive Occipital Sharp Transients of Sleep (POSTS) were observed alongside ipsilateral EEG abnormalities in five patients, questioning their status as a normal sleep variant. This suggests POSTS may indicate underlying cortical excitability.

Area of Science:

  • Neurology
  • Sleep Medicine
  • Clinical Neurophysiology

Background:

  • Positive Occipital Sharp Transients of Sleep (POSTS) are typically considered a normal variant during non-REM sleep.
  • The physiological significance of asymmetric POSTS remains unclear.

Purpose of the Study:

  • To investigate the clinical significance of asymmetric POSTS.
  • To determine if asymmetric POSTS are associated with underlying electrographic abnormalities.

Main Methods:

  • Prospective observation of five consecutive patients with strictly unilateral POSTS and ipsilateral EEG abnormalities over 30 weeks.
  • Analysis of EEG data from inpatients, outpatients, and long-term monitoring.

Main Results:

  • Five patients (four women, one boy; aged 7-76) presented with unilateral POSTS exclusively on the right side during light sleep.

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  • All patients exhibited ipsilateral epileptiform abnormalities.

    • Conclusions:

    • Asymmetric POSTS, when co-occurring with ipsilateral epileptiform abnormalities, may not be a uniformly normal variant.
    • These findings suggest that asymmetric POSTS could potentially indicate increased cortical excitability on the affected side.
    • Further research with larger sample sizes is warranted to confirm these preliminary observations.