BACKGROUND: Morbidly obese patients often have impaired respiratory mechanics leading to restrictive and obstructive lung diseases. Weight loss after bariatric surgery has been shown to improve or resolve many obesity-related comorbidities. However, few studies have examined long-term changes in pulmonary mechanics after bariatric surgery. We hypothesize that pulmonary function improves after surgically induced weight loss. METHODS: We examined the pulmonary function of 104 morbidly obese patients who underwent laparoscopic gastric bypass or gastric banding. Pulmonary studies, including forced expiratory volume in 1 s (FEV(1)), forced vital capacity (FVC), peak expiratory flow (PEF), and forced expiratory volume at midexpiratory phase (FEV(25-75%)) were measured preoperatively and at 3-month intervals. All results are expressed as a percentage of the baseline values. RESULTS: There were 80 females and 24 males with a mean age of 41 years. The mean body mass index was 48 kg/m(2). The mean percentage of excess body weight loss at 12 months was 54%. At 12 months postoperatively, restrictive pulmonary mechanics significantly improved as demonstrated by an increase in the FEV(1) to 112% of baseline value, increase in the FVC to 109% of baseline value, increase in the PEF to 115% of baseline value, and increase in the FEV(25-75%) to 130% of baseline value. Additionally, the percentage of patients with obstructive lung pattern (FEV(1)/FVC ratio less than 0.8) decreased from 9.6% preoperatively to 1.9% postoperatively (p=0.03). CONCLUSIONS: Weight loss after laparoscopic gastric bypass significantly improves restrictive and obstructive respiratory mechanics. The improvements were observed as early as 3 months postoperatively.
BACKGROUND: Morbidly obesepatients often have impaired respiratory mechanics leading to restrictive and obstructive lung diseases. Weight loss after bariatric surgery has been shown to improve or resolve many obesity-related comorbidities. However, few studies have examined long-term changes in pulmonary mechanics after bariatric surgery. We hypothesize that pulmonary function improves after surgically induced weight loss. METHODS: We examined the pulmonary function of 104 morbidly obesepatients who underwent laparoscopic gastric bypass or gastric banding. Pulmonary studies, including forced expiratory volume in 1 s (FEV(1)), forced vital capacity (FVC), peak expiratory flow (PEF), and forced expiratory volume at midexpiratory phase (FEV(25-75%)) were measured preoperatively and at 3-month intervals. All results are expressed as a percentage of the baseline values. RESULTS: There were 80 females and 24 males with a mean age of 41 years. The mean body mass index was 48 kg/m(2). The mean percentage of excess body weight loss at 12 months was 54%. At 12 months postoperatively, restrictive pulmonary mechanics significantly improved as demonstrated by an increase in the FEV(1) to 112% of baseline value, increase in the FVC to 109% of baseline value, increase in the PEF to 115% of baseline value, and increase in the FEV(25-75%) to 130% of baseline value. Additionally, the percentage of patients with obstructive lung pattern (FEV(1)/FVC ratio less than 0.8) decreased from 9.6% preoperatively to 1.9% postoperatively (p=0.03). CONCLUSIONS:Weight loss after laparoscopic gastric bypass significantly improves restrictive and obstructive respiratory mechanics. The improvements were observed as early as 3 months postoperatively.
Authors: Nicolas V Christou; John S Sampalis; Moishe Liberman; Didier Look; Stephane Auger; Alexander P H McLean; Lloyd D MacLean Journal: Ann Surg Date: 2004-09 Impact factor: 12.969
Authors: Stephen Hewitt; Sjur Humerfelt; Torgeir T Søvik; Erlend T Aasheim; Hilde Risstad; Jon Kristinsson; Tom Mala Journal: Obes Surg Date: 2014-05 Impact factor: 4.129
Authors: R A Watson; N B Pride; E Louise Thomas; J Fitzpatrick; G Durighel; J McCarthy; S X Morin; P W Ind; J D Bell Journal: J Appl Physiol (1985) Date: 2010-03-18