Part 4/Chapter 20/7-min read

Open Infrarenal and Aortoiliac Aneurysm Repair

Open infrarenal aneurysm repair remains the durable operative option for patients whose anatomy, concomitant aortoiliac disease, or long-term priorities make standard endovascular repair a poor fit. The central decisions are whether the patient is fit enough to benefit from open repair, whether transperitoneal or retroperitoneal exposure gives the safest route to the neck and iliac system, where proximal control must be obtained, and whether the reconstruction can remain aortic or iliac rather than extending to the femoral arteries. In older patients and after failed endovascular repair, the same anatomic logic must be balanced against a higher perioperative risk.

Edited by Tal M. Hörer MD, PhD · David T. McGreevy MD, PhD·Reviewed ·7 sections · 29 references

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Definition and presentation

Open infrarenal abdominal aortic aneurysm (AAA) repair replaces the diseased aorta with a prosthetic graft to provide durable exclusion. The condition presents as:

  • An asymptomatic incidental finding managed electively.
  • A symptomatic expanding aneurysm.
  • A life-threatening rupture.

Anatomical unsuitability for endovascular aneurysm repair (EVAR) is the principal driver for elective open repair. Presenting anatomical features that favor an open approach include:

  • Short, severely angulated, thrombus-lined, or heavily calcified proximal neck.
  • Narrow, calcified, tortuous, or aneurysmal iliac arteries that compromise distal seal or device delivery.
  • Combined aneurysmal and severe aortoiliac occlusive disease requiring simultaneous reconstruction.

Repair modality selection

Baseline medical management, including blood-pressure control, statin therapy, and smoking cessation, is instituted for all patients. The operative management decision balances anatomical suitability, physiological reserve, and expected survival. Elective repair is recommended at a maximum aneurysm diameter of 5.5 cm or greater in men and 5.0 cm or greater in women, or for rapid expansion exceeding 0.5 cm over six months; below these thresholds, surveillance with medical therapy is preferred . In anatomically suitable patients, early perioperative mortality is lower for EVAR than for open repair. EVAR-1 reported 30-day operative mortality of 1.7% for EVAR versus 4.7% for open repair, and DREAM 1.2% versus 4.6% . The early advantage reverses with time: in the EVAR-1 15-year follow-up, aneurysm-related mortality beyond eight years was higher after EVAR (adjusted HR ~5.8) from secondary sac rupture, whereas OVER at 14 years found no long-term difference in overall survival . However, landmark trials including EVAR-1, DREAM, and OVER established that this early survival advantage diminishes over long-term follow-up, driven by higher rates of late endograft-related events and re-interventions . Chronological age exceeding 80 years is associated with increased perioperative mortality for open repair compared with EVAR .

Elective repair modality selection

Stable, below repair threshold (< 5.5 cm men, < 5.0 cm women)
  • Preferred pathway
    Medical therapy and observation
    Rationale and key caution
    Aneurysm rupture risk does not outweigh procedural risk

  • Favorable EVAR anatomy, older or severe comorbidities

    Preferred pathway
    EVAR
    Rationale and key caution
    Lower early physiological cost and perioperative mortality
    Citation

  • Favorable EVAR anatomy, age >= 80 years

    Preferred pathway
    EVAR
    Rationale and key caution
    Open repair carries significantly higher perioperative mortality
    Citation

  • Unsuitable EVAR anatomy, young and fit

    Preferred pathway
    Open repair
    Rationale and key caution
    Avoids uncertain seal and high long-term re-intervention burden
    Citation

  • Unsuitable EVAR anatomy, severe frailty or limited lifespan

    Preferred pathway
    Medical therapy and observation
    Rationale and key caution
    Perioperative stress of open repair outweighs definitive exclusion benefit
    Citation

Decision logic for AAA management follows a stepwise assessment:

  1. Baseline medical therapy (blood-pressure control, statin, and smoking cessation) is initiated.
  2. Surveillance is maintained for stable aneurysms below intervention thresholds.
  3. Standard EVAR is the preferred first-line modality when endovascular anatomy is favorable, given its lower initial physiological burden.
  4. Open repair is selected for patients with unsuitable endovascular anatomy and sufficient physiological reserve to tolerate laparotomy and aortic cross-clamping.
  5. Medical therapy without intervention is the default pathway for frail patients or octogenarians with unsuitable EVAR anatomy, as open repair carries prohibitive perioperative mortality in this cohort.
  6. Hybrid pelvic revascularization is an adjunctive option for complex aortoiliac disease to preserve internal iliac flow, though it is reserved for highly selected anatomies.
  7. Rupture, symptomatic expansion, threatened limb, or late endograft failure mandate urgent intervention outside the elective framework.

Surgical approach and exposure

Transperitoneal and retroperitoneal approaches produce equivalent acceptable perioperative outcomes .

A transperitoneal midline incision provides broad access to the infrarenal aorta, bilateral iliac systems, and intraperitoneal organs. It is the default approach for standard infrarenal tube or bifurcated grafts with bilateral iliac involvement, right renal or visceral exposure requirements, or concurrent intra-abdominal pathology.

A retroperitoneal exposure approaches the aorta from the left flank. It is utilized for patients with previous extensive laparotomies, severe pulmonary disease, dense intraperitoneal adhesions, or juxtarenal aneurysms requiring left-sided proximal exposure. It reduces splanchnic and respiratory disruption but is limited by difficult right iliac control .

Cross-clamp location and ischemic protection

Aortic cross-clamping determines the physiological insult and ischemic territory of the operation. The clamp is placed at the lowest level that secures safe control and a durable proximal anastomosis:

  • Infrarenal clamping is the default for aneurysms with adequate proximal neck length, avoiding renal ischemia.
  • Suprarenal clamping is utilized for short or juxtarenal necks to construct a suture line in healthy aorta.
  • Supraceliac clamping is required for complex proximal disease, loss of subdiaphragmatic control, or planned visceral reconstruction.

Suprarenal and supraceliac control correlate with higher perioperative renal injury and mortality, reflecting both the ischemic burden and the complexity of the underlying anatomy . Renal protection strategies include cold renal perfusion, mannitol administration, strict limitation of clamp time, and staged control. Hemodynamic shifts during supraceliac clamping, specifically increased afterload, visceral ischemia, acidosis, and reperfusion injury, require targeted anesthetic management.

Distal reconstruction and aortoiliac extension

Distal reconstruction targets are determined by the extent of concomitant iliac aneurysmal or occlusive disease. A simple infrarenal tube graft is utilized when the common iliac arteries are healthy. A bifurcated aortobiiliac graft replaces the distal aorta and common iliac arteries when disease spares the external iliac targets.

Aortobifemoral reconstruction is required when severe calcification, complete occlusion, aneurysmal extension, or landing-zone failure precludes an iliac anastomosis. This extension increases operative complexity, lymphatic complications, groin wound infection rates, and anastomotic surveillance requirements . After open AAA repair, obtain surveillance imaging of the abdomen and pelvis by CT or color duplex ultrasound at five-year intervals to detect para-anastomotic aneurysm, graft limb complications, and new aneurysmal degeneration . For selected patients with severe aortoiliac occlusive disease, covered endovascular reconstruction of the aortic bifurcation operates as a competing, less invasive strategy .

Reconstruction involving the iliac bifurcation demands deliberate management of the internal iliac circulation to preserve pelvic perfusion and prevent buttock claudication, colonic ischemia, and spinal cord ischemia. Reimplant a patent inferior mesenteric artery when colonic-ischemia risk is increased: poor or absent back-bleeding (stump pressure below 40 mmHg), a large patent IMA with occlusive SMA or celiac disease, prior colon resection, or compromised hypogastric perfusion; otherwise suture-ligate it from within the sac. Preserve antegrade flow to at least one internal iliac artery during aortoiliac reconstruction .

Late open conversion

Late open conversion is the definitive rescue operation for a failed EVAR that can no longer maintain durable exclusion. Indications include proximal or distal seal failure with sac expansion, type III failure (component separation or fabric disruption), persistent sac expansion without a correctable endovascular source, and graft infection.

Urgent or emergent conversion for rupture, uncontained endoleak, hemodynamic instability, or sepsis carries significantly higher perioperative mortality and morbidity than planned elective conversion or primary open repair . Pooled 30-day mortality after late open conversion is approximately 3% when elective versus approximately 29% when urgent or emergent, a roughly tenfold gap that anchors the case for pre-emptive planned conversion. Elective conversion allows for physiological optimization and precise planning of the proximal cross-clamp location and explantation strategy.

Areas of controversy

The following issues in open infrarenal and aortoiliac repair lack broad consensus and remain subject to center-specific practice:

  • Minimally invasive approaches: Limited-incision, minilaparotomy, and midline retroperitoneal variants demonstrate technical feasibility but lack broad comparative evidence and remain specialized center-specific techniques . Laparoscopic aortobifemoral bypass is similarly restricted to high-volume units .
  • Pelvic revascularization: Hybrid pelvic revascularization during complex aortoiliac aneurysm repair is reported but not universally standardized, remaining reserved for highly selected anatomies .
  • Extent of explantation: During late open conversion for failed EVAR, semi-conversion with preservation of non-infected, well-sealed endograft components is selectively utilized to reduce dissection burden, but complete explantation remains the standard for infection or systemic device failure .

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