Prognostic Significance of Pulmonary Function Tests in Adolescent İdiopathic Scoliosis Surgery

After local ethics committee approval, patients' age, gender, weight, American Society of Anesthesiologists (ASA) physical status, additional diseases, localization of scoliosis, number of vertebrae affected, Cobb angle and presence of chronic lung disease will be recorded within the scope of demographic data. Cobb angle or lateral spinal curvature will be measured and recorded on the spine radiograph closest to the date of surgery. In terms of preoperative respiratory function tests, the results performed closest to the date of surgery and accepted as successful according to American Thoracic Society standards will be analyzed. In this context, forced vital capacity (FVC) percentage of normal, forced expiratory volume in 1 second (FEV1) percentage of normal, and FEV1/FVC ratios will be recorded. In the presence of an obstructive or restrictive pattern, FEV1/FVC or FVC Z-scores will be examined and evaluated as normal, mild, moderate or severe in accordance with European Respiratory Society/American Thoracic Society (ERS/ATS) guidelines. The Z-score shows how much the individual's measured value deviates from the reference population determined according to factors such as ethnicity, gender, age, and height. A z-score greater than -1.645 is considered normal, a z-score between -1.645 and -2.5 is considered mild, a z-score between -2.5 and -4.0 is considered moderate, and a z-score below -4.0 is considered severe. The recorded data will be evaluated by considering the need for intensive care admission, need for intraoperative and postoperative blood transfusion, need for postoperative intubation, length of hospital stay, mortality status, need for inotropic support, Cobb angle, location of scoliosis and number of affected vertebrae. Postoperative intubation status will be defined as patients brought to the ICU without extubation or re-intubated within 24 hours.