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Introduction: Although videos of surgical procedures are useful as an educational tool, the recording of trauma surgeries in emergency situations is difficult. We describe an inexpensive and practical shooting method using a commercially available head-mounted video camera. Methods: We used a ContourHD 1080p Helmet Camera (Contour Inc., Seattle, Washington, USA.). This small, selfcontained video camera and recording system was originally designed for easy videography of outdoor sports by participants. Results: We were able to easily make high-quality video recordings of our trauma surgeries, including an emergency room thoracotomy for chest stab wounds and a crush laparoptomy for a severe liver injury. Conclusion: There are currently many options for recording surgery in the field, but the recording device and system should be chosen according to the surgical situation. We consider the use of a helmet-mounted, selfcontained high-definition video camera-recorder to be an inexpensive, quick, and easy method for recording trauma surgeries. [ABSTRACT FROM AUTHOR]

Backgraound: An occult pneumothorax is a pneumothorax that is not seen on a supine chest X-ray but is detected by computed tomography scanning. However, critical patients are difficult to transport to the computed tomography suite. We previously reported a method to detect occult pneumothorax using oblique chest radiography (OXR). Several authors have also reported that ultrasonography is an effective technique for detecting occult pneumothorax. The aim of this study was to evaluate the usefulness of OXR in the diagnosis of the occult pneumothorax and to compare OXR with ultrasonography., Methods: All consecutive blunt chest trauma patients with clinically suspected pneumothorax on arrival at the emergency department were prospectively included at our tertiary-care center. The patients underwent OXR and ultrasonography, and underwent computed tomography scans as the gold standard. Occult pneumothorax size on computed tomography was classified as minuscule, anterior, or anterolateral., Results: One hundred and fifty-nine patients were enrolled. Of the 70 occult pneumothoraces found in the 318 thoraces, 19 were minuscule, 32 were anterior, and 19 were anterolateral. The sensitivity and specificity of OXR for detecting occult pneumothorax was 61.4 % and 99.2 %, respectively. The sensitivity and specificity of lung ultrasonography was 62.9 % and 98.8 %, respectively. Among 27 occult pneumothoraces that could not be detected by OXR, 16 were minuscule and 21 could be conservatively managed without thoracostomy., Conclusion: OXR appears to be as good method as lung ultrasonography in the detection of large occult pneumothorax. In trauma patients who are difficult to transfer to computed tomography scan, OXR may be effective at detecting occult pneumothorax with a risk of progression.