<prompt> A female post open cholecystectomy through general Anesthesia after 12 hours she is dyspneic. Right lower lobe crepitations present. Probable cause isDrug collapseAtelectasisPulmonary edemaMyocardial infarction  <response>: Ans. b AtelectasisRef: Bailey and Love 26th edition Page 273Post op complications - Respiratory: MC post operative complications are - Hypoxemia, Hypercarbia and Aspiration in recovery room Hypoxia reasons: Upper airway obstruction due to secretion Laryngeal edema Recurrent laryngeal nerve injury after thyroid surgery Hypoventilation related to anesthesia Atelectasis Pneumonia Pulmonary edema of cardiac origin Pulmonary embolism 