Sensitivity and Specificity of Physical Examination in the Diagnosis of Pneumothorax and Hemothorax

Introduction: the aim of this study was to evaluate the sensitivity and specificity of history and physical examination in the diagnosis of pneumothorax and hemotorax in blunt chest trauma patients. methods: this was a descriptive-analytical study. physical examination results were compared with findings of chest ct, x-ray, and ultrasound diagnostic methods using roc curves in spss software. findings: three (3.03) patients with pneumothorax and 7 (7.07) patients with hemotrax were found among 99 patients with mean age of 33.4±19.43. the highest sensitivity was due to chest scraping for pneumothorax (66.67%) and hemothorax (100%). the highest specificity was for abnormal lung sounds (crackle), with 96.88% specificity for pneumothorax and 98.89% specificity for hemothorax. in the study of pneumothorax, the highest ppv and npv were related to pulmonary sound reduction (12.5% and 98.7%, respectively). in the hemothorax evaluation, the highest ppv was related to chest tenderness (37.5%) and the highest npv to pulmonary sound reduction (96.3%). the highest accuracy for pneumothorax was for pulmonary sound reduction and abnormal pulmonary sounds for hemothorax. a heart rate above 98.5 was associated with pneumothorax with a sensitivity of 17.6% and a specificity of 66.7%. diastolic blood pressure below 70.5 with 46.9% sensitivity and 85.7% specificity and respiratory rate below 6.5 with 92.6% sensitivity and 57.1% specificity were associated with hemothorax. conclusion: proper physical examination and history taking can help to diagnose hemothorax and pneumothorax with high sensitivity and specificity complementarity to ct scan or x-ray results.