In a patient with sudden dyspnea, which combination of risk factors would most strongly increase suspicion for pulmonary embolism?

In a patient with sudden dyspnea, which combination of risk factors would most strongly increase suspicion for pulmonary embolism?

• A. Recent surgery
• B. Immobilization
• C. Both recent surgery and immobilization
• D. No risk factors

Answer: (C)

When assessing sudden shortness of breath for a possible pulmonary embolism, the strongest signal comes from factors that promote clot formation and travel to the lungs. Immobilization causes venous stasis in the legs, slowing blood flow and allowing clots to form more easily. Recent surgery adds endothelial injury and a temporary hypercoagulable state as the body repairs tissue, both of which push toward clot formation. Having both risks together hits multiple elements of what normally drives clotting and embolization, so the pretest probability for a pulmonary embolism is highest in this scenario. A single risk factor still raises suspicion, but not as much as when both are present. No risk factors would make PE much less likely.

When assessing sudden shortness of breath for a possible pulmonary embolism, the strongest signal comes from factors that promote clot formation and travel to the lungs. Immobilization causes venous stasis in the legs, slowing blood flow and allowing clots to form more easily. Recent surgery adds endothelial injury and a temporary hypercoagulable state as the body repairs tissue, both of which push toward clot formation. Having both risks together hits multiple elements of what normally drives clotting and embolization, so the pretest probability for a pulmonary embolism is highest in this scenario. A single risk factor still raises suspicion, but not as much as when both are present. No risk factors would make PE much less likely.