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Association between body mass index and effectiveness of continuous positive airway pressure in patients with obstructive sleep apnea: a retrospective study

  • Xinmei Huang
  • Liyan Bao
  • Xuxia Tang
  • Jun Shen
  • Xupei Ni
  • Yanfei ShenEmail author
Sleep Breathing Physiology and Disorders • Original Article
  • 68 Downloads

Abstract

Purpose

Ineffective use of continuous positive airway pressure (CPAP) therapy can result in inconvenience and additional costs in patients with obstructive sleep apnea (OSA). This study investigated the predictive value of body mass index (BMI) to assess the efficacy of CPAP in patients with OSA.

Methods

Data were extracted from a retrospective study performed in Silkeborg Hospital. The primary outcome was the improvement of Apnea-Hypopnea Index (AHI) after CPAP treatment. Association between BMI and improvement of AHI was assessed by multivariable linear regression. Interactions between BMI, baseline AHI severity (≥ 30 or < 30), and diabetes were also evaluated.

Results

Four hundred eighty-one patients were included in the study. After adjusting for confounders, high BMI (coefficient [coef], 0.80; 95% confidence interval [CI], 0.59–1.00; p < 0.001) and high AHI severity (AHI ≥ 30) (coef, 29.2; 95% CI, 26.7–31.7; p < 0.001) were associated with greater improvement of AHI after CPAP treatment, while diabetes was associated with less improvement of AHI (coef, − 4.91; 95% CI, − 9.40 to − 0.42; p = 0.032). Baseline AHI severity, diabetes, and BMI showed significant interactions (p < 0.001). On subgroup analysis, the association between BMI and improvement of AHI remained significant only in patients belonging to high AHI severity subgroup (coef, 1.18; 95% CI, 0.8–1.49; p < 0.001) and that without diabetes (coef, 1.42; 95% CI, 1.11–1.72; p < 0.001).

Conclusions

Patients with OSA having high BMI, without diabetes, are more likely to benefit from CPAP therapy. Future studies should explore the predictors of the efficacy of CPAP in more depth.

Keywords

Obstructive sleep apnea Diabetes Continuous positive airway pressure Apnea-Hypopnea Index 

Notes

Funding information

Xuxia Tang received grants from the Natural Science Foundation of Zhejiang Province (Y17H130009).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Research involving human participants

Ethical approval was obtained in the original study.

Informed consent

The requirement for informed consent was waived because of the retrospective study design.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of OtolaryngologyZheda Hospital of Zhejiang UniversityHangzhouPeople’s Republic of China
  2. 2.Department of HematologyCixi People’s HospitalZhejiangPeople’s Republic of China
  3. 3.Department of OtolaryngologyZhejiang TCM HospitalHangzhouPeople’s Republic of China
  4. 4.Department of OtolaryngologyJinhua TCM HospitalJinhuaPeople’s Republic of China
  5. 5.Department of Intensive CareZhejiang HospitalZhejiangPeople’s Republic of China

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