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Ambulatory polysomnography: technical aspects and normative values.

W V McCall1, C W Erwin, J D Edinger

  • 1Department of Psychiatry, Bowman Gray School of Medicine, Winston-Salem, North Carolina 27103.

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|January 1, 1992
PubMed
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Ambulatory polysomnography (APSG) differs from in-laboratory PSG, requiring new normative data. This study provides initial APSG data from healthy older males, highlighting differences in sleep metrics.

Area of Science:

  • Sleep Medicine
  • Neuroscience

Background:

  • Ambulatory polysomnography (APSG) offers a feasible method for sleep disorder assessment outside clinical settings.
  • Existing normative data from in-laboratory polysomnography (PSG) may not be directly applicable to APSG due to technical and methodological differences.

Purpose of the Study:

  • To review the technical considerations of APSG.
  • To present normative APSG data from a cohort of healthy older males.
  • To compare APSG findings with established in-laboratory PSG data.

Main Methods:

  • A cohort of 20 healthy older males underwent medical and psychiatric screening.
  • Subjects completed APSG in their home environment.
  • Data analysis focused on total sleep time, rapid-eye-movement (REM) sleep latency, and periodic limb movements.

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Main Results:

  • Total sleep time and REM sleep latency (RL) were shorter in APSG compared to traditional in-laboratory PSG data.
  • Shorter total sleep may be influenced by home-based behaviors affecting sleep.
  • Differences in RL may stem from variations in calculation methodologies.
  • Periodic limb movements were frequent but did not correlate with sleep disturbance.

Conclusions:

  • APSG is technically distinct from in-laboratory PSG, necessitating the development of a dedicated normative database.
  • Further research with larger cohorts is required to establish robust normative APSG data.
  • Home-based sleep assessments using APSG may reveal different sleep patterns compared to lab settings.