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Serum ferritin and obstructive sleep apnea-epidemiological study.

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Authors
Thorarinsdottir, Elin H
Arnardottir, Erna S
Benediktsdottir, Bryndis
Janson, Christer
Olafsson, Isleifur
Pack, Allan I
Gislason, Thorarinn
Keenan, Brendan T
Issue Date
2018-01-01

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Citation
Serum ferritin and obstructive sleep apnea-epidemiological study. 2018, 22(3):663-672 Sleep and breathing
Abstract
Ferritin is an intracellular iron storage protein and a marker of inflammation. Studies have shown that subjects with obstructive sleep apnea (OSA) have higher levels of circulating pro-inflammatory cytokines, but little is known about the association between ferritin and OSA. The aims of the study were to evaluate serum ferritin (S-Ferritin) levels in OSA patients compared to levels in the general population and also examine the effect of obesity level and treatment with positive airway pressure (PAP) on S-Ferritin levels. The OSA subjects (n = 796) were part of the Icelandic Sleep Apnea Cohort. The control subjects (n = 637) were randomly chosen Icelanders who participated in an epidemiological study. Propensity score (PS) methodologies were employed to minimize selection bias and strengthen causal inferences when comparing non-randomized groups. S-Ferritin levels were measured and all participants answered the same detailed questionnaire about sleep and health. Only OSA patients underwent a sleep study and were re-invited for a 2-year follow-up. S-Ferritin levels were significantly higher in OSA males than controls (213.3 vs. 197.3 μg/L, p = 0.007). However, after adjusting for confounders and using our PS methodology, no significant difference was found. S-Ferritin levels were not correlated with severity of OSA, obesity level, or clinical symptoms. Also, no significant change in S-Ferritin levels was found with 2 years of PAP treatment. S-Ferritin levels are comparable in OSA patients and controls and do not change consistently with obesity level or PAP treatment in our sample.
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Additional Links
https://link.springer.com/article/10.1007/s11325-017-1598-y
ae974a485f413a2113503eed53cd6c53
10.1007/s11325-017-1598-y
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English Journal Articles (Peer Reviewed)

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