Lung ultrasonography underdiagnoses clinically significant pneumothorax.

Area of Science:

• Emergency Medicine
• Radiology
• Trauma Surgery

Background:

• Ultrasonography is integral to trauma care.
• Its reliability for screening pneumothorax in initial trauma evaluation is uncertain.
• This study investigated chest ultrasonography's sensitivity for detecting pneumothorax.

Purpose of the Study:

• To evaluate the sensitivity of chest ultrasonography for detecting clinically significant pneumothorax in blunt chest trauma patients.
• To determine the false negative rate of chest ultrasonography in this population.

Main Methods:

• Prospective observational study at a level 1 trauma center.
• Included patients with blunt chest trauma undergoing chest radiography, chest ultrasonography, and CT.
• All imaging interpreted by attending trauma surgeons and radiologists.

Main Results:

• Chest ultrasonography demonstrated low sensitivity for pneumothorax detection.
• A high false negative rate of 72% was observed.
• False negative cases often required tube thoracostomy and were associated with lower O2 saturation, lower blood pressure, and rib fractures.

Conclusions:

• Chest ultrasonography has low sensitivity and a high false negative rate when used for initial pneumothorax screening in trauma.
• Caution is advised when relying solely on chest ultrasonography for pneumothorax evaluation due to clinically significant false negatives.