• Stephen Hewitt, Sjur Humerfelt, Torgeir T Søvik, Erlend T Aasheim, Hilde Risstad, Jon Kristinsson, and Tom Mala.
• Department of Morbid Obesity and Bariatric Surgery, Department of Endocrinology, Obesity and Preventive Medicine, Medical Clinic, Oslo University Hospital, Aker, PO Box 4950, Nydalen, 0424, Oslo, Norway, s... more tehewi@online.no. less
• Obes Surg. 2014 May 1;24(5):705-11.

BackgroundObesity is associated with reduced pulmonary function. We evaluated pulmonary function and status of asthma and obstructive sleep apnoea syndrome (OSAS) before and 5 years after bariatric surgery.MethodsSpirometry was performed at baseline and 5 years postoperatively. Information of asthma and OSAS were recorded. Of 113 patients included, 101 had undergone gastric bypass, 10 duodenal switch and 2 sleeve gastrectomy.ResultsEighty (71%) patients were women, mean preoperative age was 40 years and preoperative weight was 133 kg in women and 158 kg in men. Five years postoperatively, weight reduction was 31% (42 kg; p < 0.001) in women and 24% (38 kg; p < 0.001) in men. Forced expiratory volume in 1 s (FEV1) increased 4.1% (116 ml; p < 0.001) in women and 6.7% (238 ml; p = 0.003) in men. Forced vital capacity (FVC) increased 5.8% (209 ml; p < 0.001) in women and 7.6% (349 ml; p < 0.001) in men. Gender and weight loss were independently associated with the improvements in FEV1 and FVC. At follow-up, FEV1 had increased 36% of the difference towards the estimated normal FEV1, and there was a corresponding 70% recovery of FVC. These improvements occurred despite an expected decline in pulmonary function by age during the study period. Of the asthmatics and OSAS patients, 48 and 80%, respectively, were without symptoms 5 years postoperatively.ConclusionsPulmonary function measured with spirometry was significantly improved 5 years after bariatric surgery, despite an expected age-related decline during this period. Symptoms of asthma and OSAS also improved.

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