Obesity Surgery

, Volume 29, Issue 2, pp 601–608 | Cite as

Improvement in Nocturnal Hypoxemia in Obese Patients with Obstructive Sleep Apnea after Bariatric Surgery: a Meta-Analysis

  • Yuxiang Zhang
  • Wenyue Wang
  • Chengcan Yang
  • Jiahui Shen
  • Meilong Shi
  • Bing WangEmail author
Original Contributions



To conduct a meta-analysis examining the effects of bariatric surgery on nocturnal hypoxemia in obese patients with obstructive sleep apnea (OSA).


PubMed, EMBASE, Cochrane Library, and Web of Science were searched (the last search date was June 10, 2018) to identify relevant clinical studies. The mean arterial oxygen saturation (MeanSaO2), nadir oxygen saturation (NadirSaO2), apnea hypopnea index (AHI), and body mass index (BMI) data during the perioperative period were extracted and analyzed using a random effects model. Then, we performed subgroup and sensitivity analyses and calculated the publication bias to assess the between-study heterogeneity.


In total, 15 studies with 636 patients were included; 13 were prospective observational trials, 1 was a randomized controlled trial (RCT), and 1 was a retrospective trial. After surgery, the MeanSaO2 and NadirSaO2 increased by 1.36 [95% CI (0.72, 2.00)] and 1.08 [95% CI (0.68, 1.49)], respectively, and the AHI and BMI decreased by 1.11 [95% CI (0.82, 1.40)] and 1.97 [95% CI (1.67, 2.27)], respectively. However, the heterogeneity across all trials was high; we identified some of the sources of that heterogeneity through subsequent subgroup and sensitivity analyses.


Bariatric surgery is effective at improving nocturnal hypoxemia in obese patients with OSA; it also reduces body weight and the number of apnea events. More randomized controlled and comparative trials are necessary in the future to confirm our findings and to explore the potential underlying mechanisms.


Meta-analysis Bariatric surgery Obstructive sleep apnea Nocturnal hypoxemia Apnea hypopnea index 



Many thanks to the patience and support from my tutor, professor Wang.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that there are no conflicts of interest.

Ethical Approval

For this type of study, formal consent is not required.

Financial Disclosure


Supplementary material

11695_2018_3573_MOESM1_ESM.docx (1.1 mb)
ESM 1 (DOCX 1170 kb)


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of General Surgery, Shanghai Ninth People’s HospitalShanghai JiaoTong University School of MedicineShanghaiChina

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