Imaging recommendation · Chest

ARDS evaluation and complications

Q: What's the alternative imaging for ards evaluation and complications when etiology unclear or complication suspected?

CT — CT Chest with IV contrast (iv contrast).

Q: What's the alternative imaging for ards evaluation and complications when need to exclude pe concurrent?

CT — CT Pulmonary Angiogram (iv contrast).

Recommended: Chest X-ray (daily); CT Chest if etiology unclear or complication suspected is the preferred imaging study for ards evaluation and complications. Diffuse bilateral infiltrates with non-cardiogenic pulmonary edema.

Recommended study

Chest X-ray (daily); CT Chest if etiology unclear or complication suspected

XR No contrast Preferred Chest Acute inpatient Reviewed 2026-05

Diffuse bilateral infiltrates with non-cardiogenic pulmonary edema. Apply Berlin criteria.

If the default doesn't apply

Etiology unclear or complication suspected

CT CT Chest with IV contrast IV contrast

Need to exclude PE concurrent

CT CT Pulmonary Angiogram IV contrast

Watch-outs

Lung-protective ventilation

Image findings should not delay low-tidal-volume strategy (4–6 mL/kg ideal body weight).

Distinguishing ARDS from cardiogenic edema

CXR appearance overlaps — clinical context, BNP, and echo help; PEEP often improves cardiogenic edema more rapidly.

Pearls

Berlin criteria: bilateral opacities + non-cardiogenic + PaO2/FiO2 ratio defines mild/moderate/severe.
Prone positioning improves oxygenation in moderate-severe ARDS.
ECMO consideration when PaO2/FiO2 < 80 despite optimization.