Why are patients with pneumonia at increased risk for pulmonary embolism, and which nursing assessments help detect PE early?

• A. Inflammation reduces clotting; daily CT scans detect PE.
• B. Inflammation and immobilization increase thrombotic risk; nursing actions include monitoring vitals, oxygenation, mobilization, mechanical prophylaxis, anticoagulation as ordered, and watching for PE symptoms.
• C. PE risk is unrelated to pneumonia; focus only on infection control.
• D. PE is prevented by strict bed rest; no mobilization.

Answer: (B)

Pneumonia raises the risk of pulmonary embolism because of two intertwined factors: inflammation can make the blood more prone to clotting (a hypercoagulable state), and illness often leads to reduced mobility, which slows blood flow in the legs (venous stasis). Together these effects align with part of Virchow’s triad and set the stage for a venous thromboembolism that can travel to the lungs. Nursing care focuses on preventing clots and catching PE early through vigilant assessment.

Early detection hinges on closely monitoring how the patient’s oxygenation and hemodynamics are changing. Watch for sudden shifts such as rapid or irregular heart rate, increased breathing effort, falling oxygen saturation, or new or worsening shortness of breath and chest discomfort. Be alert for leg signs of DVT—new swelling, warmth, tenderness, or color change in the calves or thighs—since a DVT can seed a PE. Promote and assist mobilization as tolerated, including leg exercises and getting out of bed when feasible. Use mechanical prophylaxis (like sequential compression devices) and administer anticoagulation as ordered, with ongoing monitoring for adverse effects such as bleeding. Stay vigilant for PE symptoms: abrupt dyspnea, pleuritic chest pain, tachycardia, tachypnea, hypoxia, or changes in mental status.

Daily CT scans aren’t routine for PE screening, and complete bed rest actually increases thrombotic risk, so the focus is on preventing thrombosis and catching early respiratory or circulatory deterioration through these nursing assessments and interventions.