How does chest ultrasonography compare to supine chest radiography for the diagnosis of pneumothorax in trauma patients?

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Why is this study important?

Supine chest x-ray (CXR) is recommended in the current Advanced Trauma Life Support guidelines in the emergency department (ED) assessment of the trauma patient.[1] Bedside chest ultrasound (CUS) allows timely and accurate diagnosis of pneumothorax which is important in trauma care. The review evaluates the evidence comparing CXR and CUS for the diagnosis of pneumothorax in trauma patients.

Which, if any, threats to validity are most likely to have an impact on the results and how?

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