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Diagnostic yield of standard-wake and sleep EEG recordings

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  • Pirgit Meritam, Danish Epilepsy Centre, Dianalund
  • ,
  • Elena Gardella, Danish Epilepsy Centre, Dianalund, University of Southern Denmark
  • ,
  • Jørgen Alving, Danish Epilepsy Centre, Dianalund, Rigshospitalet
  • ,
  • Daniella Terney, Danish Epilepsy Centre, Dianalund
  • ,
  • Melita Cacic Hribljan, Rigshospitalet
  • ,
  • Sándor Beniczky

OBJECTIVE: To investigate whether Posterior Dominant Rhythm (PDR) can be reliably assessed in sleep-EEG recordings and to investigate the diagnostic yield of standard-wake and sleep-recordings.

METHODS: EEG recordings of 303 consecutive patients aged 18-88 years were analyzed. All patients had both standard-wake and sleep-recordings, including patients who had abnormal standard recordings. Melatonin was used in 6% of sleep EEGs, and sleep deprivation in 94%. The mean duration of sleep was 41 min. We measured the PDR frequency in standard and sleep-recordings, both before and after sleep. We compared the diagnostic yield of standard-wake and sleep EEG recordings.

RESULTS: Compared to standard EEG, sleep-recordings showed a significantly lower PDR frequency, both when measured before and after sleep (p < 0.001). One-hundred-fifty-six patients (51%) had normal standard recordings, and 35 of them (22%) had abnormal findings in the sleep-recording. One-hundred-forty-seven patients had abnormal standard recordings and in 16 of them (11%) these abnormalities were not present in sleep-recording.

CONCLUSIONS: PDR is significantly slower in the wake periods of sleep-recordings, compared to standard wake recordings.

SIGNIFICANCE: Sleep and standard wake recordings are complementary.

Original languageEnglish
JournalClinical Neurophysiology
Pages (from-to)713-716
Number of pages4
Publication statusPublished - 1 Apr 2018

    Research areas

  • Diagnostic yield, EEG, Posterior dominant rhythm, Sleep deprivation, Standard recording, Electroencephalography/methods, Humans, Middle Aged, Wakefulness/physiology, Sleep Deprivation/diagnosis, Sleep/physiology, Young Adult, Adolescent, Aged, 80 and over, Adult, Aged, Retrospective Studies

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