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Curr Vasc Pharmacol. 2018;16(3):289-297. doi: 10.2174/1570161115666170529085708.

Vitamin D Levels in Middle-Aged Patients with Obstructive Sleep Apnoea Syndrome.

Author information

1
Master Programme in Sleep Medicine, Medical School, Democritus University of Thrace, Alexandroupolis, Greece.
2
Laboratory of Hygiene and Environmental Protection, Medical School, Democritus University of Thrace, Alexandroupolis, Greece.
3
Second Department of Internal Medicine, Democritus University of Thrace, Alexandroupolis, Greece.
4
Laboratory of Nuclear Medicine, Medical School, Democritus University of Thrace, Alexandroupolis, Greece.
5
Department of Pneumonology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece.
6
Laboratory of Pharmacology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece.

Abstract

BACKGROUND:

Vitamin D (Vit D) insufficiency has been implicated in the pathophysiology of numerous diseases. Obstructive sleep apnoea syndrome (OSAS), a disorder associated with increased cardiovascular and cerebrovascular morbidity, has been associated with decreased Vit D levels, but reports are inconclusive.

AIM:

To evaluate the association between serum 25-hydroxyvitamin D [25(OH)D], a marker of Vit D status, with anthropometric and sleep characteristics of OSAS patients and to compare those levels between OSAS patients and non-apnoeic controls.

METHOD:

Consecutive subjects who had undergone polysomnography and pulmonary function testing were divided into controls (apnoea-hypopnea index, AHI <5/h) and OSAS group (AHI ≥5/h).

RESULTS:

A total of 169 subjects (135 men) were included. OSAS patients (n=139) significantly differed from non-apnoeic controls in terms of age (53.9±12.8 vs. 44.9±12.8 years, p=0.002) and body mass index (BMI) (35.9±6.9 vs. 29.9±6.8 kg/m2, p<0.001). Serum 25(OH)D levels were lower in OSAS patients (17.8±7.8 vs. 23.9±12.4 ng/ml, p=0.019). In OSAS patients, levels of serum 25(OH)D were negatively correlated with sleep stage transitions (r=-0.205, p=0.028), AHI (r=-0.187, p=0.045), oxygen desaturation index (r=-0.234, p=0.011) and percentage of time with oxyhaemoglobin saturation <90% (r=-0.172, p=0.041). In contrast, they were positively correlated with average oxyhaemoglobin saturation during sleep (r=0.179, p=0.033), forced expiratory volume in 1 sec (r=0.207, p=0.037) and oxygen partial pressure (r=0.197, p=0.029).

CONCLUSION:

Vit D levels were lower in OSAS patients compared with non-apnoeic controls. Several indices of OSAS severity also correlated with Vit D levels.

KEYWORDS:

Hypoxia; inflammation; obstructive sleep apnoea syndrome; sleep fragmentation; vascular complications; vitamin D.

[Indexed for MEDLINE]

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