To develop a predictive model identifying perioperative conditions associated with postoperative pulmonary complications (PPCs).Design: A prospective survey of patients whose preoperative history and physical examination, spirometric, PaO 2 and PaCO 2 analysis, and operative results were recorded. These patients underwent postoperative cardiopulmonary examinations until they were discharged from the hospital; their medical records were also reviewed until they were discharged from the hospital.