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Analysis of the prevalence of atelectasis in patients undergoing bariatric surgery. BACKGROUND AND OBJECTIVE: To observe the prevalence of atelectasis in patients undergoing bariatric surgery and the influence of the body mass index (BMI), gender and age on the prevalence of atelectasis. METHOD: Retrospective study of 407 patients and reports on chest X-rays carried out before and after bariatric surgery over a period of 14 months. Only patients who underwent bariatric surgery by laparotomy were included. RESULTS: There was an overall prevalence of 37.84% of atelectasis, with the highest prevalence in the lung bases and with greater prevalence in women (RR=1.48). There was a ratio of 30% for the influence of age for individuals under the age of 36, and of 45% for those older than 36 (RR=0.68). There was no significant influence of BMI on the prevalence of atelectasis. CONCLUSION: The prevalence of atelectasis in bariatric surgery is 37% and the main risk factors are being female and aged over 36 years.