Bedside Ultrasound Versus Chest Radiography for Detection of Pulmonary Edema: A Prospective Cohort Study

Area of Science:

• Emergency Medicine
• Radiology
• Cardiology

Background:

• Chest radiography is the standard for assessing pulmonary congestion but suffers from interobserver variability.
• Lung ultrasound (US) offers objective findings like B-lines, indicating changes in lung fluid content.
• Limited direct comparisons exist between chest radiography and bedside US for pulmonary edema diagnosis.

Purpose of the Study:

• To compare the diagnostic accuracy, specifically sensitivity and specificity, of bedside lung US versus chest radiography for pulmonary edema.

Main Methods:

• Prospective observational cohort study of adult patients with dyspnea in an emergency department.
• Pulmonary edema diagnosis based on B-lines on bedside US and radiologist-interpreted chest radiography.
• Discharge summary served as the reference standard; US performed within one hour of radiography.

Main Results:

• Bedside US demonstrated significantly higher sensitivity (96%) compared to chest radiography (65%; P < .001).
• In patients with negative chest X-rays but a confirmed diagnosis of pulmonary edema, 89% showed positive US findings (P < .001).
• The study enrolled 99 patients; 32.3% had congestive heart failure and 40.4% had chronic obstructive pulmonary disease.

Conclusions:

• Bedside lung ultrasound shows superior accuracy in identifying pulmonary edema compared to chest radiography.
• Findings suggest lung US may be a more reliable tool for diagnosing pulmonary edema.
• Further evaluation is warranted given current US guidelines favor chest radiography for heart failure management.