Relationship between inflammation and cognitive function in obstructive sleep apnea.

Sleep Breath. 2009 Mar;13(1):35-41. Epub 2008 Jun 13.
Relationship between inflammation and cognitive function in obstructive sleep apnea.
Haensel A, Bardwell WA, Mills PJ, Loredo JS, Ancoli-Israel S, Morgan EE, Heaton RK, Dimsdale JE.

Department of General Internal Medicine, University Hospital Berne, Berne, Switzerland.

Obstructive sleep apnea (OSA) can have adverse effects on cognitive functioning, mood, and cardiovascular functioning. OSA brings with it disturbances in sleep architecture, oxygenation, sympathetic nervous system function, and inflammatory processes. It is not clear which of these mechanisms is linked to the decrease in cognitive functioning. This study examined the effect of inflammatory parameters on cognitive dysfunction.

Thirty-nine patients with untreated sleep apnea were evaluated by polysomnography and completed a battery of neuropsychological tests. After the first night of evaluation in the sleep laboratory, blood samples were taken for analysis of interleukin 6, tumor necrosis factor-alpha (TNF-alpha), and soluble TNF receptor 1 (sTNF-R1).

sTNF-R1 significantly correlated with cognitive dysfunction. In hierarchical linear regression analysis, measures of obstructive sleep apnea severity explained 5.5% of the variance in cognitive dysfunction (n.s.). After including sTNF-R1, percentage of variance explained by the full model increased more than threefold to 19.6% (F = 2.84, df = 3, 36, p = 0.05). Only sTNF-R1 had a significant individual relationship with cognitive dysfunction ( = 0.376 t = 2.48, p = 0.02).

sTNF-R1 as a marker of chronic inflammation may be associated with diminished neuropsychological functioning in patients with OSA.

[PubMed – indexed for MEDLINE]

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