## Clinical Presentation of AAA Rupture: Contained vs. Free **Key Point:** Hypotension is NOT invariable in ruptured AAA. Patients with contained rupture may remain hemodynamically stable, which is a critical distinction that affects urgency and outcome. ### Pathophysiology: Contained vs. Free Rupture | Feature | Contained Rupture | Free Rupture | |---------|-------------------|---------------| | **Anatomical location** | Rupture contained by aortic wall, fascia, and surrounding tissues (usually retroperitoneal) | Rupture into peritoneal cavity or pleural space | | **Hemodynamic status** | Often stable or mildly hypotensive; may have time for imaging | Severe hypotension, shock, rapid deterioration | | **Onset of symptoms** | More gradual; patient may have hours of stability | Sudden, catastrophic; minutes to hours | | **Mortality** | ~50% if treated urgently | ~80–90% if untreated; ~30–40% if treated | | **Bleeding pattern** | Slow, tamponaded by retroperitoneal tissues | Rapid, uncontrolled hemorrhage | **High-Yield:** A hemodynamically STABLE patient with AAA rupture has a contained rupture — this is the only scenario where you might have time for CT imaging and a more deliberate operative approach. ### Clinical Presentation of Rupture 1. **Classic triad (not always present):** - Severe abdominal or back pain - Pulsatile abdominal mass - Hypotension 2. **Atypical presentations:** - Flank pain radiating to groin (mimics renal colic) - Epigastric pain (mimics MI or peptic ulcer) - Syncope or altered mental status 3. **Signs of retroperitoneal bleeding:** - **Grey Turner sign:** Flank ecchymosis (blue-grey discoloration) - **Cullen sign:** Periumbilical ecchymosis - **Psoas sign:** Groin ecchymosis - These indicate contained rupture with retroperitoneal extravasation **Clinical Pearl:** A patient with a known AAA who suddenly develops back pain and remains normotensive should be assumed to have a contained rupture until proven otherwise — this patient may benefit from CT imaging and a more controlled operative approach. ### Diagnosis **Bedside ultrasound:** Can confirm AAA diameter and presence of rupture (free fluid), but lacks sensitivity for contained rupture. **CT angiography:** Gold standard for hemodynamically stable patients; can: - Confirm AAA rupture - Differentiate contained vs. free rupture - Assess aortic anatomy for endovascular repair candidacy - Identify associated injuries **Operative exploration:** Indicated immediately in unstable patients without imaging delay. ### Why Option 1 Is Wrong **Hypotension is NOT invariable in ruptured AAA.** Patients with contained rupture may be hemodynamically stable or only mildly hypotensive. The presence or absence of shock is the key distinguishing feature between contained and free rupture and has major implications for management urgency and imaging strategy. **Warning:** Assuming all ruptured AAAs present with shock is a dangerous misconception that could lead to delayed diagnosis in a stable patient with contained rupture.
Sign up free to access AI-powered MCQ practice with detailed explanations and adaptive learning.