DVT vs Pulmonary embolism
How to tell DVT and Pulmonary embolism apart when a board question makes them look alike.
Step 2 CK pairs are in open beta while clinical review finishes. Spot an issue? Tell us.
Acute respiratory symptoms with chest imaging evidence of pulmonary arterial clot identify PE rather than isolated DVT.
Side by side
Unilateral leg swelling, calf tenderness, and increased calf circumference suggest deep venous thrombosis.
Sudden dyspnea, pleuritic chest pain, tachycardia, or hypoxemia suggests pulmonary embolism.
Venous stasis and hypercoagulability promote thrombus formation in deep leg veins.
Detached venous thrombus embolizes to pulmonary arteries causing ventilation-perfusion mismatch and right-heart strain.
Compression ultrasonography showing noncompressible proximal vein confirms DVT; D-dimer is useful to exclude in low-risk patients.
CT pulmonary angiography showing intraluminal filling defects confirms PE; right ventricular strain markers include elevated BNP, troponin, and RV dilation on echo.
The trap
Clinicians stop workup after finding leg DVT and miss concurrent PE when dyspnea is present. New hypoxemia or pleuritic pain should trigger PE-directed imaging and risk stratification, not DVT-only management assumptions.
The repair move
Next best step: start therapeutic anticoagulation immediately with IV unfractionated heparin or weight-based low-molecular-weight heparin unless contraindicated, then choose long-term oral anticoagulation for at least 3 months. If hypotension or shock develops, escalate to systemic thrombolysis or catheter-directed therapy.
Try a free question
CoreA 45-year-old woman has unilateral calf swelling and tenderness after a long flight. She has no chest symptoms and oxygen saturation is 98%. What is the next best step in management?
Show answer and explanation
Answer: A. Obtain compression venous ultrasound of the leg. Isolated leg symptoms without pulmonary findings should be evaluated first with compression ultrasound for DVT.
Why the other choices are tempting
- B. Wrong. CTPA is reserved for suspected PE presentations.
- C. Wrong. Thrombolysis is not first-line for stable isolated DVT.
- D. Wrong. Untreated DVT can embolize and should not be ignored.
- E. Wrong. Arterial studies do not evaluate venous thrombus.
Flashcards
Tap a card to flip it.
What bedside symptom shift suggests PE rather than isolated DVT?
Sudden dyspnea or pleuritic chest pain with hypoxemia.
Which test confirms proximal lower-extremity DVT?
Compression venous ultrasound showing noncompressible vein.
Quick answers
What is the fastest way to tell DVT from Pulmonary embolism?
Acute respiratory symptoms with chest imaging evidence of pulmonary arterial clot identify PE rather than isolated DVT.
What is the key clue for DVT?
Unilateral leg swelling, calf tenderness, and increased calf circumference suggest deep venous thrombosis.
What is the key clue for Pulmonary embolism?
Sudden dyspnea, pleuritic chest pain, tachycardia, or hypoxemia suggests pulmonary embolism.
What is the common trap with DVT vs Pulmonary embolism?
Clinicians stop workup after finding leg DVT and miss concurrent PE when dyspnea is present. New hypoxemia or pleuritic pain should trigger PE-directed imaging and risk stratification, not DVT-only management assumptions.