Replication Data for: Preoperative atelectasis in patients with obesity undergoing bariatric surgery a cross-sectional study

The objective of this study was to assess the prevalence and extension of preoperative atelectasis in patients with obesity undergoing bariatric surgery, and the extent to which atelectasis explained preoperative SpO2 values. This was a single-center cross-sectional study conducted in a specialized center for laparoscopic bariatric surgery in Tijuana, Mexico mainly receiving patients from abroad. The study period was the month of June 2020. A sequential approach consisting of 1) patients were asked for sign and symptoms of COVID-19 prior to arriving to the hospital and advised not to present for surgery if these were present, 2) upon arrival at the hospital, a rapid SARS-CoV-2 antibody testing was performed. If IgM against SARS-CoV-2 was positive, the surgery was postponed. 3) If the antibody test was negative, a chest computed tomography (CT) was performed and a CO-RADS4 score ≥3 was considered suggestive of COVID-19, leading to cancellation of the surgery. Since chest CT images were available as part of this screening process, we considered this a unique opportunity to study the prevalence and extent of preoperative atelectasis in patients with obesity undergoing bariatric surgery. Adult patients who presented for elective bariatric surgery who underwent chest CT scan screening for COVID-19 were eligible. This study was reviewed and approved by the ethics committee of Hospital General de Tijuana (CONBIOÉTICA-02-CEI-001-20170526, approval no. 001771).