Abrupt dyspnea, tachycardia, pleuritic chest pain, hypoxia, hemoptysis, and lower-extremity pain are classic for which condition?

• A. Pneumonia
• B. Pulmonary embolism
• C. Acute bronchitis
• D. Pneumothorax

Answer: (B)

Abrupt dyspnea with pleuritic chest pain and hypoxia, together with hemoptysis and lower-extremity pain, points to a pulmonary embolism. The scenario fits because a clot usually forms in the deep veins of the leg (deep vein thrombosis), breaks loose, and travels to the lungs, suddenly blocking pulmonary arteries. This acute obstruction triggers rapid breathing, chest pain that worsens with breaths, and reduced oxygen levels. Hemoptysis can occur when lung tissue becomes damaged or infarcted from the blocked blood supply. The leg pain supports the idea that the clot originated in the leg.

Other conditions can cause chest pain or breathing difficulty, but they don’t typically present with this combination of sudden dyspnea, pleuritic pain, hypoxemia, hemoptysis, and leg symptoms all together. Pneumonia usually brings fever and productive cough; acute bronchitis mainly causes cough without ongoing hypoxemia or leg-clot clues; pneumothorax involves sudden chest pain and unilateral findings like decreased breath sounds, but hemoptysis and leg DVT signs are not defining features.