• Ming-Shian Lu, Yao-Kuang Huang, Yun-Hen Liu, Hui-Ping Liu, and Chiung-Lun Kao.
• Division of Thoracic Surgery, Chang Gung Memorial Hospital, Chang Gung University, Putz City, Chiayi County, Taiwan.
• Am J Emerg Med. 2008 Jun 1;26(5):551-4.

ObjectivePneumothorax (PTX) after trauma is a preventable cause of death. Drainage procedures such as chest tube insertion have been traditionally advocated to prevent fatal tension PTX. We evaluated the safety of close observation in patients with delayed PTX complicating rib fracture after minor chest trauma.Materials And MethodsAdult patients (>18 years) with a diagnosis of chest trauma and 3 or fewer fractured ribs were reviewed. Case patients were divided according to age, location and number of fractured ribs, mechanism of trauma, and initial pulmonary complication after thoracic trauma for comparative analysis.ResultsThere were 207 male (70.2%) and 88 female (29.8%) patients whose ages ranged from 18 to 93 years (median, 55 years). The mechanisms of trauma were a motor vehicle accident in 207 patients, falls in 66, pedestrian injury in 10, and assaults in 14. Ninety-five patients sustained 1 rib fracture, 95 had 2 rib fractures, and 105 suffered 3 rib fractures. Right-sided injury occurred in 164 cases, left-sided injury did in 127, and bilateral injury did in 4. The most frequent location of rib fractures was from the fourth rib to the ninth rib. The initial pulmonary complications after trauma were PTX in 16 patients, hemothorax in 43, pneumohemothorax in 14, lung contusion in 75, and isolated subcutaneous emphysema (SubcEmph) in 33. Thirty percent of the patients (n = 5/16) who presented with traumatic PTX were observed safely without drainage. Delayed PTX was recorded in 16 patients, occurring mostly during the first 2 days of their admission. Associated extrathoracic injury was recorded in 189 patients. The mean hospital stay of the patients was 7.66 days. Longer hospital stay was related to increasing number of fractured ribs, need for thoracic drainage, and the presence of associated extrathoracic injury. The mortality rate for the entire group was 2%. The presence of SubcEmph was the only risk factor associated with the development of delayed PTX.ConclusionsPatients sustaining blunt chest trauma and minor rib fractures should be admitted for close observation when presenting with SubcEmph because of possible delayed presentation of PTX.

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