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Does cognitive dysfunction conform to a distinctive pattern in obstructive sleep apnea syndrome?

Raffaele Antonelli Incalzi1, Camillo Marra, Bruna Lorena Salvigni

  • 1Department of Gerontology, Università Cattolica del Sacro Cuore Geriatric Outpatient Department ASL RM E, Rome, Italy.

Journal of Sleep Research
|March 5, 2004
PubMed
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Obstructive sleep apnea (OSA) causes cognitive dysfunction. Some OSA patients exhibit a distinct pattern of severe impairment in thinking and memory, potentially linked to subcortical damage.

Area of Science:

  • Neurology
  • Sleep Medicine
  • Neuropsychology

Background:

  • Obstructive sleep apnea (OSA) is a known contributor to cognitive impairment.
  • Distinct neuropsychological patterns in OSA require further investigation.
  • Understanding these patterns aids in differential diagnosis and management.

Purpose of the Study:

  • To identify a unique neuropsychological profile in newly diagnosed, untreated Obstructive Sleep Apnea (OSA) patients.
  • To compare OSA cognitive performance with other conditions like dementia and COPD.
  • To explore potential underlying mechanisms of OSA-related cognitive dysfunction.

Main Methods:

  • Cross-sectional comparative study involving 49 untreated OSA patients, 27 with multi-infarctual dementia (MID), 31 with dementia of Alzheimer type (DAT), and 63 with severe chronic obstructive pulmonary disease (COPD).

Related Experiment Videos

  • Groups were matched for age and education.
  • Discriminant analysis was used to compare neuropsychological test performance across groups and identify distinct cognitive profiles.

    • Main Results:

    • OSA patients showed a bimodal cognitive distribution, with 14 patients (OSAw) exhibiting significantly worse performance than 35 patients (OSAb).
    • The OSAw group displayed severe impairments in deductive thinking, verbal attainment, and constructive ability, comparable to DAT and MID.
    • Approximately 25% of newly diagnosed OSA patients presented with a severe, distinct cognitive dysfunction, suggesting a subcortical origin.

    Conclusions:

    • A significant subset of untreated OSA patients exhibits a specific, severe pattern of cognitive dysfunction.
    • This pattern shares similarities with Multi-infarctual Dementia, suggesting potential subcortical involvement.
    • Identifying this distinct OSA cognitive profile is crucial for accurate diagnosis and targeted interventions.