Chart — Med-Surg
Aortic Aneurysm vs Dissection Chart
Two ways the aorta fails: it can balloon (aneurysm — usually silent until it bursts) or it can tear and split (dissection — sudden tearing pain). Both are driven by hypertension; both can kill fast.
Educational use only. Both are potentially life-threatening and provider-directed emergencies when symptomatic. This chart is an educational comparison aid. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
Side by Side
| Feature | Aortic aneurysm | Aortic dissection |
|---|---|---|
| Pathology | Permanent localized DILATION (ballooning) of a weakened aortic wall | TEAR in the intima → blood splits the wall layers (false lumen) |
| Typical onset | Usually silent/chronic; found incidentally | Abrupt, dramatic onset |
| Hallmark presentation | Often asymptomatic; pulsatile abdominal mass/bruit; vague back/abdominal pain | Sudden severe TEARING/ripping chest or back pain, often migrating |
| Key sign | Pulsatile mass; rupture triad = pain + hypotension + pulsatile mass | BP/pulse DIFFERENTIAL between arms; pulse deficits |
| Major danger | RUPTURE → hemorrhagic shock | Extension/rupture, tamponade, branch-vessel ischemia (stroke, MI, limb) |
| Management priority | BP control + smoking cessation; surveillance, repair at threshold (~5.5 cm AAA)/symptoms | Rapid HR + BP control (beta-blocker FIRST); type A = emergency surgery |
Exam Traps
- ✦Aneurysm = dilation (balloon); dissection = tear that splits the wall layers.
- ✦Aneurysm is usually silent; dissection is sudden severe TEARING pain that may migrate.
- ✦Dissection clue: a BP/pulse differential between the arms.
- ✦Don't deeply palpate a suspected AAA — it can trigger rupture.
- ✦Dissection: beta-blocker FIRST (rate), then vasodilator; Stanford A = emergency surgery, B = often medical.
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with Academy of Medical-Surgical Nurses (AMSN) · Current medical-surgical nursing standards. It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →