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Effect of bariatric surgery on lung function and asthma control after 8 years of follow-up

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Bariatric surgery has a proven beneficial effect on asthma symptoms and lung function in patients with class III obesity and asthma. The effects of bariatric surgery on asthma control and small airway function persist for at least 12 months after bariatric surgery. However, long-term follow-up data are lacking.


To evaluate the very-long term effects of bariatric surgery on asthma symptoms and lung function.


In a prospective, longitudinal follow-up study, we planned an 8-year follow-up visit for patients previously included in the OBAS 1.0 trial, which evaluated the effects of bariatric surgery on asthma control and lung function in patients with asthma and class III obesity in The Netherlands.


Fifteen of 78 patients from the OBAS trial completed the 8-year follow-up visit. Nine patients underwent bariatric surgery, and six patients did not. After 8 years of follow-up, asthma control (Asthma Control Questionnaire [ACQ] score at 12 months of 0,4 versus an ACQ score of 0.7 at 8 years of follow-up; p = 0.075) and small airway function (R5-R20 (frequency-dependent resistance at 5Hz-20Hz); score at 12 months of 0,25 versus an ACQ score of 0.07 at 8 years of follow-up; p = 0.345) remained clinically stable compared with 12 months of follow-up. Patients who underwent bariatric surgery had a statistically significant weight regain between 12 months of follow-up and 8 years of follow-up (median [interquartile range] body mass index 30.2 kg/m2 [23.9‐43.4 kg/m2] versus 32.3 kg/m2 [24.0‐36.4 kg/m2]; p = 0.025). However, the impact of weight regain on asthma control, and asthma quality of life was clinically insignificant (ACQ, β (regression coefficient) = 0.04; 95% Confidence Interval [0.02; 0.06]; p < 0.001; and AQLQ; β = ‐0.04 CI [‐0.07; ‐0.009]; p = 0.013).


These results emphasize the importance of bariatric surgery in treating obesity-related asthma.

Keywords: Asthma; Asthma control; Bariatric surgery; Impulse oscillometry; Lung function; Metabolic surgery; Obesity; Small airway function; Weight loss surgery; Weight regain

Document Type: Research Article

Affiliations: 1: From the Department of Pulmonology, Franciscus Gasthuis, Rotterdam, The Netherlands 2: Department of Statistics and Education, Franciscus Academy, Franciscus Gasthuis and Vlietland, Rotterdam, The Netherlands 3: Department of Pulmonology, Leiden University Medical Centre, Leiden, The Netherlands

Publication date: May 1, 2023

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  • Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.

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    The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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