Serum vitamin D levels in patients with obstructive sleep apnea syndrome and level changes after continuous positive airway pressure therapy

Purpose Patients with obstructive sleep apnea syndrome (OSAS) have been found to exhibit lower serum vitamin D levels, even when the control groups are matched for confounding conditions. However, contradictory studies are also present. This study aimed to compare serum 25-hydroxyvitamin D (25(OH)D)...

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Bibliographic Details
Published in:	Sleep & breathing Vol. 25; no. 2; pp. 657 - 668
Main Authors:	Siachpazidou, Dimitra I., Kotsiou, Ourania S., Stavrou, Vasileios, Pastaka, Chaido, Gogou, Eudoxia, Kechagia, Maria, Varsamas, Charalampos, Economou, Nicholas-Tiberio, Zouridis, Spyridon, Patrikioy, Eleni, Seitanidis, George, Pinaka, Maria, Sistou, Alexandra, Hatzoglou, Chrissi, Gourgoulianis, Konstantinos I.
Format:	Journal Article
Language:	English
Published:	Cham Springer International Publishing 01-06-2021 Springer Nature B.V
Subjects:	25-Hydroxyvitamin D Apnea Case-Control Studies Continuous positive airway pressure Continuous Positive Airway Pressure - statistics & numerical data Dentistry Female Humans Internal Medicine Male Medicine Medicine & Public Health Middle Aged Neurology Otorhinolaryngology Patient Compliance - statistics & numerical data Pediatrics Pneumology/Respiratory System Respiratory tract Sleep Sleep apnea Sleep Apnea, Obstructive - blood Sleep Apnea, Obstructive - therapy Sleep Breathing Physiology and Disorders • Original Article Sleep disorders Vitamin D Vitamin D - analogs & derivatives Vitamin D - blood Obstructive sleep apnea syndrome Vitamin D Continuous positive airway pressure 25-Hydroxyvitamin D
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Summary:	Purpose Patients with obstructive sleep apnea syndrome (OSAS) have been found to exhibit lower serum vitamin D levels, even when the control groups are matched for confounding conditions. However, contradictory studies are also present. This study aimed to compare serum 25-hydroxyvitamin D (25(OH)D) levels between adult patients with OSAS and non-apneic controls and to evaluate the changes in 25(OH)D levels after 3 and 12 months of continuous positive airway pressure (CPAP) therapy. Methods The study was comprised of 30 patients with OSAS and 30 controls. Serum 25(OH)D levels were determined at baseline and after 3 and 12 months of CPAP therapy in all patients with OSAS. For analysis, patients with OSAS were divided into subgroups by adherence, with adherence defined as CPAP usage for > 4 h per night on at least 70% of nights. Results The 25(OH)D levels were not significantly different between OSAS and control groups at baseline. 25(OH)D levels did not change after 3 and 12 months of CPAP therapy. Patients who were CPAP-adherent showed less reduction in 25(OH)D levels compared with non-adherent ones (21.18 ± 9.3 vs. 12.13 ± 3.8 ng/mL, p = 0.022) after 1 year. The 25(OH)D levels were significantly correlated with higher daily CPAP usage at 3 and 12 months. Mean daily CPAP usage was a significant predictor of serum 25(OH)D levels at 12 months. Conclusions Patients with OSAS who demonstrated good CPAP adherence showed significantly higher 25(OH)D levels after 1 year compared with those not adequately using CPAP. Long-term good CPAP adherence and highly daily CPAP usage positively affected 25(OH)D levels in patients with OSAS.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1520-9512 1522-1709
DOI:	10.1007/s11325-020-02146-6