Aortic Aneurysm vs Aortic Dissection
Aortic Aneurysm and Aortic Dissection are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Aortic Aneurysm vs Aortic Dissection at a glance
- Aortic Aneurysm: Pathologic aortic dilation — AAA usually infrarenal and degenerative; thoracic often connective tissue or bicuspid-related; surgical thresholds drive management.
- Aortic Dissection: Intimal tear with blood propagating in the aortic media — Stanford A surgery, Stanford B medical unless complicated.
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Side-by-side comparison
| Feature | Aortic Aneurysm | Aortic Dissection |
|---|---|---|
| At a glance | Pathologic aortic dilation — AAA usually infrarenal and degenerative; thoracic often connective tissue or bicuspid-related; surgical thresholds drive management. | Intimal tear with blood propagating in the aortic media — Stanford A surgery, Stanford B medical unless complicated. |
| Classic presentation | Most aneurysms are asymptomatic — detected on screening or incidentally; AAA expansion or impending rupture: vague abdominal or back pain, flank pain; Ruptured AAA: sudden severe abdominal/back pain, syncope, hypotension — surgical emergency; TAA: chest, back, or shoulder pain; hoarseness (recurrent laryngeal nerve), dysphagia, cough;… | Sudden, severe, tearing or ripping chest pain that radiates to the back/interscapular region (anterior chest for type A, between scapulae for type B); Maximum severity at onset (unlike crescendo MI pain); Migratory pain following dissection propagation; Syncope (especially type A — tamponade, severe AR); Focal neurologic deficit… |
| Workup / key labs | AAA: infrarenal aortic diameter ≥3.0 cm. Surgical repair thresholds — AAA: ≥5.5 cm in men, ≥5.0 cm in women, expansion >0.5 cm in 6 months, or symptomatic. Ascending TAA: ≥5.5 cm (≥5.0 cm Marfan or bicuspid with risk factors, ≥4.5 cm Loeys-Dietz or undergoing AVR). Descending TAA: ≥5.5-6.0 cm or rapid expansion.; CBC, BMP, type and… | Stanford A: involves ascending aorta (regardless of distal extent) — surgical emergency. Stanford B: confined to descending aorta distal to the left subclavian — generally medical management. DeBakey I: ascending and descending; II: ascending only; III: descending only.; CBC, BMP, type and crossmatch (massive transfusion likely);… |
| Imaging | Abdominal ultrasound — screening modality of choice for AAA (USPSTF recommends one-time screening for men 65-75 who ever smoked); CT angiography — definitive sizing, anatomy, planning for endovascular repair; MR angiography — alternative when iodinated contrast contraindicated; Echocardiography for ascending TAA and aortic valve… | CT angiography of chest/abdomen/pelvis — first-line in hemodynamically stable patients (defines extent, identifies branch involvement, planning); Transesophageal echocardiography — bedside option for unstable patients or those who cannot undergo CT; MR angiography — alternative when iodinated contrast contraindicated; Transthoracic… |
| First-line treatment | Smoking cessation (single most effective intervention to slow AAA growth); Blood pressure control — beta-blocker (metoprolol, atenolol) reduces aortic wall stress; ARB (losartan) has shown benefit in Marfan (additive to beta-blocker); High-intensity statin therapy; Surveillance imaging by size:; • AAA 3.0-3.9 cm: ultrasound every 3… | ABCs, 2 large-bore IVs, type and crossmatch, ICU admission; AGGRESSIVE blood pressure and heart rate control FIRST — target HR <60 and SBP 100-120 mmHg; IV beta-blocker FIRST to blunt reflex tachycardia: esmolol load 0.5 mg/kg then 50-200 mcg/kg/min, OR labetalol 10-20 mg IV bolus then infusion; AFTER beta-blockade established, add IV… |
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