Which signs are typical of pulmonary embolism in ICU patients?

• A. Fever and productive cough
• B. Acute dyspnea, hypoxemia, tachycardia
• C. Hypotension alone without dyspnea
• D. Chest pain with normal oxygenation

Answer: (B)

Pulmonary embolism in the ICU most often presents with a sudden onset of breathing difficulty, trouble with oxygen exchange, and a racing heart. The sudden blockage of a pulmonary artery creates a sharp ventilation-perfusion mismatch and increased dead space, so the lungs can’t transfer oxygen efficiently, leading to hypoxemia. The body responds with tachycardia to keep oxygen delivery to tissues, and dyspnea from the increased work of breathing and acute gas exchange disturbance.

Fever and productive cough are more typical of an infectious process like pneumonia, not PE. Hypotension can occur with massive PE, but it isn’t as characteristic as the combination of acute dyspnea, hypoxemia, and tachycardia. Chest pain with normal oxygenation is not typical because PE commonly affects oxygenation due to V/Q mismatch, though chest pain can occur; the normal oxygenation makes this presentation less consistent with classic PE.

So, the signs that best fit pulmonary embolism in ICU patients are acute dyspnea, hypoxemia, and tachycardia.