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Relationship between sleep apnea and thyroid function

Sleep and Breathing volume 19, pages 85–89 (2015)Cite this article

An Erratum to this article was published on 02 September 2014

Abstract

Purpose

Sleep apnea is sometimes associated with hypothyroidism, but the significance of thyroid function screening in sleep apnea patients has been controversial. In the present study, we investigated the relationship between thyroid function and sleep apnea in subjects who were suspected to have sleep apnea.

Methods

We enrolled 156 consecutive subjects suspected of having sleep apnea. Subjects included 117 men and 39 women aged 21 to 84 years. They underwent nocturnal multichannel polysomnography during a one-night hospitalization. The examined indices of sleep apnea were apnea–hypopnea index (AHI), lowest oxygen saturation, oxygen desaturation index, longest apnea duration, mean apnea duration, and the percent of apnea time to sleep time. Serum thyroid-stimulating hormone (TSH), free triiodothyronine (FT3), and free thyroxine (FT4) were concomitantly measured by electrochemiluminescence immunoassays.

Results

Three subjects (1.9 %) were diagnosed with primary hypothyroidism (high TSH and low FT4), and one subject (0.6 %) with subclinical hypothyroidism (high TSH and normal FT4). No significant difference in the level of TSH, FT3, or FT4 was seen among subjects with different severity of sleep apnea. The mean apnea duration significantly correlated with TSH in both simple and multiple regression analyses. Subjects with lower FT3 (≤3.75 pg/ml) showed longer mean apnea time compared to those with higher FT3 (>3.75 pg/ml) (24.9 ± 0.8 vs. 20.2 ± 1.2 s; P = 0.009). The other indices of sleep apnea did not show significant correlation with thyroid function.

Conclusions

These results suggest that the mean apnea duration and TSH/FT3 may be helpful in understanding reciprocity between the two disease states, and for evaluating the validity of thyroid function tests in patients with sleep apnea.

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There is no actual or potential conflict of interest in relation to this work.

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Affiliations

  1. Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, 807-8555, Japan

    Shoko Takeuchi, Takuro Kitamura, Toyoaki Ohbuchi, Hiroki Koizumi, Risa Takahashi, Nobusuke Hohchi & Hideaki Suzuki

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  1. Shoko Takeuchi
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  2. Takuro Kitamura
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  3. Toyoaki Ohbuchi
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  4. Hiroki Koizumi
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  5. Risa Takahashi
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  6. Nobusuke Hohchi
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  7. Hideaki Suzuki
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Corresponding author

Correspondence to Hideaki Suzuki.

Additional information

Shoko Takeuchi and Hideaki Suzuki equally contributed to this work.

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Takeuchi, S., Kitamura, T., Ohbuchi, T. et al. Relationship between sleep apnea and thyroid function. Sleep Breath 19, 85–89 (2015). https://doi.org/10.1007/s11325-014-0966-0

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Keywords

  • Sleep apnea
  • Thyroid function
  • Thyroid-stimulating hormone
  • Triiodothyronine
  • Thyroxine
  • Mean apnea duration