Obstructive sleep apnoea, cigarette smoking and plasma orexin-A in a sleep clinic cohort.
J Int Med Res
; 37(2): 331-40, 2009.
Article
in En
| MEDLINE
| ID: mdl-19383226
ABSTRACT
Orexin-A is a neuropeptide involved in the regulation of food intake and the sleep-wake cycle. This study investigated plasma orexin-A levels in a sleep clinic cohort, adjusting for smoking habits, in 76 participants comprising 41 with obstructive sleep apnoea (OSA) (apnoea-hypopnoea index [AHI] 44.1 +/- 19.1 events/h) and 35 without OSA (AHI 6.3 +/- 4.7 events/h). Plasma orexin-A levels were significantly lower in OSA patients (15.0 +/- 4.6 ng/ml) compared with those without OSA (31.4 +/- 6.5 ng/ml). In non-OSA subjects, there was no significant difference between never smokers and ex/current smokers in plasma orexin-A levels (32.9 +/- 9.5 versus 29.7 +/- 8.9 ng/ml, respectively) whereas, in the OSA sub-group, orexin-A levels were significantly lower in never smokers than in ex/current smokers (4.0 +/- 1.2 versus 21.4 +/- 7.0 ng/ml). A significant inverse relationship was found between plasma orexin-A levels and AHI amongst never smokers, but there was no significant relationship amongst ex/current smokers. These results confirm previous studies demonstrating lower levels of plasma orexin-A in OSA patients and indicate that smoking may affect orexin-A levels and AHI.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Sleep
/
Neuropeptides
/
Smoking
/
Sleep Apnea, Obstructive
/
Intracellular Signaling Peptides and Proteins
Type of study:
Etiology_studies
/
Incidence_studies
/
Observational_studies
/
Risk_factors_studies
Limits:
Female
/
Humans
/
Male
/
Middle aged
Language:
En
Journal:
J Int Med Res
Year:
2009
Document type:
Article
Affiliation country:
Turkey