Aortic dissection vs Myocardial infarction / pulmonary embolism
How to tell Aortic dissection and Myocardial infarction / pulmonary embolism apart when a board question makes them look alike.
Dissection is chest pain plus aortic/branch-vessel clues; MI is coronary ischemia; PE is pleuritic hypoxemic thromboembolism.
Side by side
Abrupt tearing chest pain radiating to the back with pulse deficit, asymmetric blood pressures, neurologic symptoms, new aortic regurgitation, or widened mediastinum.
MI is ischemic pressure with ECG/troponin pattern; PE is pleuritic pain with dyspnea, tachycardia, hypoxemia, and thromboembolic risk.
An intimal tear lets blood split the aortic media and compromise branch vessels or the aortic valve.
MI reflects coronary plaque rupture or supply-demand mismatch; PE reflects embolic obstruction of pulmonary arteries.
BP discrepancy, pulse deficit, back-radiating tearing pain, focal neurologic deficit, or mediastinal widening points dissection.
Regional ST changes and troponin dynamics point MI; pleuritic dyspnea with VTE risk and hypoxemia points PE.
The trap
Troponin can rise in dissection, so do not ignore pulse deficits or neurologic symptoms before anticoagulation.
Watch it explained
The repair move
For dangerous chest pain, check pain quality, pulse/BP symmetry, oxygenation, ECG, and dissection red flags before committing.
Try a free question
CoreA patient has sudden tearing chest pain radiating to the back, asymmetric arm blood pressures, a new diastolic murmur, and a widened mediastinum. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Aortic dissection. Tearing pain to the back with pulse or blood pressure asymmetry and aortic regurgitation signs points aortic dissection.
Why the other choices are tempting
- B. MI classically has pressure-like pain with ischemic ECG/troponin findings.
- C. PE causes pleuritic pain, dyspnea, tachycardia, and hypoxemia risk.
- D. Pericarditis causes positional pleuritic pain and diffuse ST elevation.
- E. Reflux should not cause pulse deficits or mediastinal widening.
Flashcards
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What is the fastest separator for Aortic dissection vs Myocardial infarction / pulmonary embolism?
Dissection is chest pain plus aortic/branch-vessel clues; MI is coronary ischemia; PE is pleuritic hypoxemic thromboembolism.
What clue should make you choose Aortic dissection?
Abrupt tearing chest pain radiating to the back with pulse deficit, asymmetric blood pressures, neurologic symptoms, new aortic regurgitation, or widened mediastinum.
Quick answers
What is the fastest way to tell Aortic dissection from Myocardial infarction / pulmonary embolism?
Dissection is chest pain plus aortic/branch-vessel clues; MI is coronary ischemia; PE is pleuritic hypoxemic thromboembolism.
What is the key clue for Aortic dissection?
Abrupt tearing chest pain radiating to the back with pulse deficit, asymmetric blood pressures, neurologic symptoms, new aortic regurgitation, or widened mediastinum.
What is the key clue for Myocardial infarction / pulmonary embolism?
MI is ischemic pressure with ECG/troponin pattern; PE is pleuritic pain with dyspnea, tachycardia, hypoxemia, and thromboembolic risk.
What is the common trap with Aortic dissection vs Myocardial infarction / pulmonary embolism?
Troponin can rise in dissection, so do not ignore pulse deficits or neurologic symptoms before anticoagulation.