Part 4/Chapter 26/6-min read

Ruptured AAA/Iliac Aneurysm and Emergency Aortic Care

Suspected ruptured AAA and iliac aneurysm as a bedside diagnosis first and an imaging diagnosis second. The chapter frames triage of the unstable patient, transfer thresholds, permissive hypotension, and the open-versus-endovascular emergency repair decision.

Edited by Tal M. Hörer MD, PhD · David T. McGreevy MD, PhD·Reviewed ·5 sections · 28 references

Listen to this chapter6 min · AI audio edition · two hostsAI narration

Emergency handoff / trauma debrief: Urgent but calm: frame the initial recognition, the sequence of decisions, transfer/workflow, and what changes the plan.

General medical education, not patient-specific advice.

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Definition and presentation

Ruptured abdominal aortic aneurysm is a life-threatening surgical emergency. The classic clinical presentation consists of:

  • Acute back, abdominal, or flank pain
  • Hemodynamic instability
  • A known abdominal aortic aneurysm or a detectable pulsatile abdominal mass

Diagnosis is clinical and prompts immediate triage . Contrast-enhanced computed tomography angiography (CTA) is the definitive imaging modality. It confirms the diagnosis, delineates aorto-iliac anatomy, and establishes the technical feasibility of an emergency endovascular approach. Bedside ultrasound confirms aneurysm presence when CTA is delayed, but does not postpone definitive hemorrhage control in unstable patients.

Preoperative resuscitation and triage

Preoperative resuscitation utilizes permissive hypotension to limit ongoing hemorrhage while preserving cerebral and end-organ perfusion during transfer and the pre-clamp phase. The target systolic blood pressure is 70 to 90 mmHg. Cautious fluid administration maintains this target, but is escalated for declining mental status or overt markers of end-organ hypoperfusion. Permissive hypotension functions exclusively as a bridge to rapid operative control and is not a strategy for prolonged observation .

Contemporary emergency aortic care requires a structured institutional program. Capabilities include pre-hospital triage to a vascular center, a hybrid theatre or angiography-capable operating room, an aortic-experienced anesthetic team, and a dedicated postoperative critical-care pathway. Rural and resource-limited regions utilize explicit pre-hospital transfer pathways to route patients directly to capable centers .

Treatment strategy and decision

Observation or medical management alone is non-curative and generally fatal. Intervention is indicated for all patients in whom hemorrhage control aligns with overall care goals. For patients with prohibitive operative risk, limited life expectancy, or contrary care preferences, deliberate no-intervention and palliation is the appropriate pathway. When intervention proceeds, the choice balances anatomical suitability against hemodynamic stability and institutional capability.

In the IMPROVE trial, an endovascular-first strategy gave 30-day and 90-day mortality similar to open repair, then a mid-term survival advantage at three years (48% versus 56% mortality) with better quality of life and lower cost; by seven years mortality was about 60% in both arms, with no significant difference . Pooled registry data support that emergency endovascular aneurysm repair (EVAR) yields comparable or lower early mortality than open repair when patient anatomy and center programs are favorable . Standard anatomical selection criteria governing the choice of endovascular repair include adequate proximal neck length, acceptable neck angulation, lack of prohibitive calcification or thrombus in the seal zone, and sufficient iliofemoral access calibre.

Ruptured isolated iliac artery aneurysm follows the same logic on a smaller scale. A stable patient with adequate proximal and distal landing zones is treated endovascular-first, by covered stent across the aneurysm or an iliac branch device where the internal iliac origin must be preserved, with coil embolisation and cover of the internal iliac where it cannot. Open repair is reserved for hostile landing zones, failed access, or haemodynamic collapse that precludes imaging and endovascular deployment .

Emergency ruptured AAA pathways

  • Care goals prohibit intervention

    Preoperative action
    Provide comfort care
    Preferred pathway
    Palliation
    Citation

  • Hemodynamically tolerant

    Preoperative action
    Contrast-enhanced CTA to define anatomy
    Preferred pathway
    Endovascular-first strategy if anatomy permits; open repair if unsuitable
    Citation

  • Hemodynamically unstable

    Preoperative action
    Expedite directly to operating theatre
    Preferred pathway
    Direct hemorrhage control (EVAR or open, based on immediate capability)
    Citation

  • Ruptured isolated iliac aneurysm

    Preoperative action
    Contrast-enhanced CTA to define landing zones
    Preferred pathway
    Endovascular-first (covered stent or iliac branch device) if zones permit; open repair if hostile
    Citation

  • Unsuitable endovascular anatomy

    Preoperative action
    Direct to open repair planning
    Preferred pathway
    Open surgical repair
    Citation

The standard stepwise triage logic is:

  1. Immediate triage is initiated by hemodynamic instability and acute pain alongside a known aneurysm or pulsatile mass.
  2. Permissive hypotension (systolic 70 to 90 mmHg) limits hemorrhage while expediting transfer to a capable center.
  3. Intervention suitability is established; patients whose goals of care or physiological status preclude survival are transitioned to a palliative pathway.
  4. Hemodynamically tolerant patients undergo contrast-enhanced CTA to evaluate endovascular suitability.
  5. Unstable patients who cannot tolerate imaging proceed directly to the operating theatre for immediate hemorrhage control.
  6. An endovascular-first strategy is executed if anatomy permits; open repair is the default when anatomy is hostile or endovascular capability is absent.

Sex disparities and counseling

Women presenting with ruptured abdominal aortic aneurysms demonstrate higher rupture-associated mortality than men in pooled registry analyses. This disparity is driven by smaller iliac access vessels, shorter proximal aneurysm necks, and later clinical presentation . The mortality gap narrows at high-volume aortic centers.

Pre-arrival counseling establishes the life-threatening nature of the emergency and the primary goal of immediate hemorrhage control. The endovascular-first approach offers comparable early outcomes and a mid-term survival and quality-of-life advantage, but remains strictly contingent on anatomical suitability and institutional resources.

Areas of controversy

The translation of the IMPROVE trial into a universal EVAR mandate remains debated. The trial evaluated an endovascular-first strategy pathway rather than isolated technical superiorities, and a substantial proportion of patients assigned to the endovascular-first arm ultimately required open repair . IMPROVE was not the only randomized trial. AJAX randomised 116 stable patients and found 30-day death or severe complications of 42% versus 47% for open repair, no significant difference . ECAR gave 30-day mortality of 18% versus 24%, also not significant . Pooled individual-patient data from all three trials showed 30-day mortality of 31.3% for the endovascular strategy versus 34.0% for open repair, with no significant difference . The mid-term survival advantage seen at three years had converged by seven years, so the durable case for an endovascular-first strategy rests on faster recovery, better early quality of life, and lower cost rather than a sustained mortality difference . Furthermore, registry data demonstrating lower early mortality for EVAR are limited by pronounced selection bias, as patients undergoing endovascular repair frequently present with more favorable anatomy and greater physiological reserve than those selected for open repair .

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