Effects of Bariatric Surgery on Indices of Obstructive Sleep Apnea and Pulmonary Function Tests

Background: Obesity reaches the epidemic situation. Obstructive sleep apnoea is a major concern in obese patients.  Aim of the work:To analyse apnoea hypopnea index and to evaluate changes in pulmonary functions before and after bariatric surgery in obese patients. Patients and Methods: We identify 160 patients who met our inclusion criteria. However, 121 patients returned for follow up evaluation. They were 98 women and 23 men. 84 had Raux-en-Y gastric bypass and 37 had sleeve gastrectomy. They were subjected to full history taking, clinical examination, objective measures of obstructive sleep apnoea [apnoea hypopnea index, body mass index, mean oxygen saturation, low oxygen saturation, nasal continuous positive airway pressure and Pulmonary function tests]. In addition, all patients were submitted to a sleep study. Results:Statistically significant improvement was obtained postoperative for apnoea hypopnea index, body mass index, nasal continuous positive airway pressure requirement, mean oxygen saturation and low oxygen saturation. The spirometry and lung volume finding showed statistically significant improvement in lung function parameters after surgery. There was a significant positive correlation between body mass index and apnoea hypopnea index, with significant negative correlation between body mass index and forced vital capacity. Conclusion: Bariatric surgery is associated with significant improvement in pulmonary functions and obstructive sleep apnoea indices