Diagnostic Inaccuracies Using Extended Focused Assessment With Sonography in Trauma for Traumatic Pneumothorax

Abstract

Background

Traumatic pneumothorax (PTX) can be deadly, and rapid diagnosis is vital. Ultrasound (US) is rapidly gaining acceptance as an accurate bedside diagnostic tool. While making the diagnosis is important, not all PTX require tube thoracostomy. Our goal was to evaluate the predictive ability of ultrasound in identifying clinically significant PTX.

Methods

Over 13 months, data was collected on patients undergoing evaluation for trauma. Patients were included if they underwent US, radiograph chest X-ray (CXR), and computed tomography of the chest. Predictive ability of ultrasound was evaluated in identifying clinically significant PTX.

Results

Ninety-four patients received evaluation by all 3 modalities. Of these, 32% were diagnosed with PTX. Sixteen patients (17%) had a clinically significant PTX. Chest X-ray and US both had a sensitivity of 75%; however, US had more than twice as many false positives, resulting in a much lower positive predictive value (63% vs 80%).

Conclusions

While US can reliably rule out PTX, it may be overly sensitive diagnosing clinically significant PTX. Ultrasound alone should not be used in determining the need for tube thoracostomy as many patients will not require acute intervention.