Ruptured AAA/Iliac Aneurysm and Emergency Aortic Care

26.1Diagnosis and triage of suspected ruptured AAA

Suspected rupture is a bedside diagnosis first and an imaging diagnosis second. The patient who should enter the emergency aortic pathway is the patient presenting with acute back, abdominal, or flank pain and hemodynamic instability in the setting of a known abdominal aortic aneurysm or a detectable pulsatile abdominal mass. In that circumstance, the decisive question is not whether the patient has had a complete elective aneurysm assessment; it is whether the clinical picture is sufficiently concerning to mobilise hemorrhage control, vascular imaging if tolerated, and definitive repair without delay. The resident should document the specific clinical triggers: pain location, hemodynamic instability, known aneurysm history or examination finding, and whether the patient was tolerant enough for contrast-enhanced CT angiography Editor's Choice European 2024 · ACC/AHA 2022 · SVS 2018 · Western Vascular Society 2017 · Permissive Hypotension. 2026 · Ruptured AAA bridging 2024 · Houston Methodist Ruptured 2023 · Reporting standards endovascular 2002.

In the haemodynamically tolerant patient, contrast-enhanced CT angiography is the diagnostic study that changes management. It confirms the diagnosis, defines the aorto-iliac anatomy, and allows the team to decide whether an emergency endovascular-first approach is technically possible or whether open repair is required. The practical point for the trainee is that “stable enough for CT” is a clinical judgment made in real time: the patient must be able to leave the resuscitation bay without converting the diagnostic step into a dangerous delay in hemorrhage control. When CT angiography is obtained, the operative plan should be made from that scan, not from habit or from an elective aneurysm template Editor's Choice European 2024 · ACC/AHA 2022 · SVS 2018.

In the haemodynamically unstable patient, the management-changing criterion is different: the patient may need direct transfer to theatre rather than further imaging. Bedside ultrasound by the emergency clinician may be useful when CT is delayed because it can confirm the presence of an AAA, but ultrasound should not be allowed to become a reason to postpone hemorrhage control in an unstable patient. A practical way to frame the decision is this: imaging is appropriate when it accelerates or safely enables the repair strategy; imaging is inappropriate when it competes with immediate operative control.

Documentation should be brief, explicit, and defensible. Record whether the patient was “haemodynamically tolerant” or “not tolerant” of CT angiography, what evidence supported suspected rupture, who was notified, and where the patient was sent next. In a ruptured aortic pathway, ambiguity causes delay; the note should make clear why the patient went to CT, theatre, or transfer. The same discipline applies to interhospital discussions: communicate the clinical syndrome, hemodynamic status, imaging status, and whether a pulsatile abdominal mass or known AAA is present.

26.2Permissive hypotension and the bridge to repair

Permissive hypotension is a bridge to repair, not a resuscitation philosophy for prolonged observation. During transfer and the pre-clamp phase of suspected ruptured AAA, cautious fluid resuscitation with a systolic blood pressure target near 70–90 mmHg is used to limit ongoing hemorrhage while preserving enough cerebral and end-organ perfusion to reach definitive control. The resident should understand the intent: avoid converting contained or partially controlled bleeding into uncontrolled bleeding by aggressive volume administration before the aorta is controlled.

The practical target is a systolic blood pressure of approximately 70–90 mmHg. This is not a rigid number divorced from the patient in front of you. It is a working range to guide restrained resuscitation while the team shortens time to transfer, anesthesia, aortic control, and repair. In handover, state both the pressure range being pursued and the reason: “permissive hypotension for suspected ruptured AAA while proceeding to definitive hemorrhage control.” That framing helps prevent well-meaning escalation of fluid administration that may undermine the strategy.

The common failure mode is treating permissive hypotension as a substitute for speed. It is not. It is paired with rapid transfer and rapid operative decision-making, not prolonged stabilization in the emergency department or referring hospital. In practical terms, once the syndrome of suspected ruptured AAA is recognised, every intervention should be judged by whether it helps the patient reach aortic control. If it does not, it should be shortened, deferred, or abandoned.

The target must be relaxed when the patient shows evidence that the price of hypotension is becoming too high. Declining mental status or other markers of end-organ hypoperfusion should prompt reassessment, because cerebral and organ perfusion remain essential even while hemorrhage is being limited. The resident’s task is to watch the patient, not just the monitor: a systolic pressure in the desired range is not reassuring if the patient is losing consciousness or otherwise declaring inadequate perfusion.

26.3Emergency endovascular versus open repair

The operative choice in ruptured AAA is best understood as a strategy decision made under time pressure. An endovascular-first strategy means the pathway is organized to identify suitable anatomy rapidly and deliver emergency EVAR when possible, while retaining open repair for patients whose anatomy, access, or clinical circumstances do not permit endovascular exclusion. The IMPROVE trial randomized patients with suspected ruptured AAA to an endovascular-first strategy versus open repair and showed comparable 30-day mortality, with a survival advantage at 3 and 7 years in follow-up of the endovascular-first strategy Endovascular treatment ruptured 2017 · Endovascular open repair 2014 · Open surgery OS 2016 · Endovascular vs. Open 2016.

The resident should be precise when discussing the evidence. The IMPROVE comparison was a strategy comparison; not every patient assigned to the endovascular-first arm actually underwent endovascular repair. This matters at the bedside because the pathway benefit depends on the institution’s ability to move quickly from suspicion to imaging, decision, and treatment. It is misleading to translate the trial into “all ruptures should receive EVAR.” The better lesson is that a center capable of a disciplined endovascular-first emergency pathway can achieve outcomes at least comparable early and favorable in longer follow-up, while still selecting open repair when required.

Pooled registry analyses and reviews support the same practical interpretation: emergency endovascular repair for ruptured AAA has comparable or lower early mortality than open emergency repair when patient anatomy and the center program permit it. The absolute benefit varies across registries and centers, and selection bias is real. A patient treated by EVAR in a registry may have been anatomically and physiologically different from a patient treated open; the surgeon must not ignore that when applying aggregate outcomes to an individual emergency Mortality After Ruptured 2025 · Accuracy presenting symptoms 2022 · Local versus general 2022 · Outcome Ruptured Abdominal 2020 · Situ Antegrade Laser 2018 · Endovascular treatment ruptured 2014 · Endovascular vs. open 2008.

Center capability is part of patient selection. Emergency EVAR is not simply a device choice; it requires a functioning program, immediate imaging interpretation, appropriate operating-room or hybrid capability, endovascular inventory, anesthetic familiarity, and a team able to convert or proceed open when anatomy is unsuitable. Where those conditions are absent, attempting to improvise an endovascular pathway may create harmful delay. Conversely, in a mature emergency aortic program, an endovascular-first default can be appropriate because the system is designed to make the endovascular-versus-open decision quickly.

The complication or failure mode the trainee must anticipate is delay caused by indecision. A patient unsuitable for EVAR should not remain in limbo while the team searches for a way to make the anatomy fit the plan. Likewise, a patient who is suitable for EVAR in a capable center should not undergo open repair merely because of operator habit. The disciplined approach is to match the patient’s anatomy and physiology to the center’s proven emergency capability, then commit.

26.4Sex disparity and centre programme design

Women presenting with ruptured AAA have higher rupture-associated mortality than men in pooled registry analyses. The gap appears narrower at high-volume aortic centers, but it is sufficiently consistent to matter in pathway design and pre-arrival counseling. The practical implication is not to regard sex as destiny; it is to recognise that women may arrive with anatomical and pathway-related disadvantages that require an organized, experienced emergency aortic system rather than ad hoc decision-making Oxidative stress-related genetic 2024 · Characteristics outcomes small 2021 · Long-Term Outcomes After 2020 · Long-term survival following 2017 · Endovascular repair ruptured 2013 · Trends Incidence Abdominal 2023 · Managing Emergent Surgery 2022 · Open repair ruptured 2018.

Several factors contribute to this disparity. Smaller iliac access, shorter proximal necks, and later presentation can all affect the feasibility and timing of emergency repair. These are not abstract epidemiological observations; they influence whether CT angiography can be translated into an endovascular plan, whether access is straightforward, and whether the patient has already lost physiological reserve by the time the vascular team is activated. Case-mix and pathway differences also shape pooled estimates, so the finding should be applied thoughtfully rather than as a crude prediction for an individual patient Mortality After Ruptured 2025 · Characteristics outcomes small 2021 · Trends Incidence Abdominal 2023.

The appropriate response is program design. Contemporary emergency aortic care depends on pre-hospital triage to a vascular center, immediate availability of a hybrid theatre or angio-capable operating room, an aortic-experienced anesthetic team, and a post-operative critical-care pathway. For the resident, the lesson is that ruptured AAA outcomes are not determined only at the moment of clamp placement or stent-graft deployment. They are shaped by whether the patient reached the right hospital, whether the room was ready, whether the team was familiar with rupture physiology, and whether critical care was prepared for the postoperative course.

Rural and resource-limited regions need explicit transfer pathways because program capacity varies by geography. A hospital that cannot provide emergency aortic repair should have a clear process for identifying suspected rupture, using permissive hypotension during transfer when appropriate, and communicating with the receiving vascular center. The receiving center should in turn make the imaging-versus-direct-theatre decision quickly and should be prepared for both endovascular and open options according to anatomy and capacity.

Counseling and pathway activation should be honest about elevated risk in women without allowing that risk to become therapeutic nihilism. High-volume aortic centers appear to narrow the outcome gap, which supports systems that route patients rapidly to experienced programs when feasible. The resident should learn to say, calmly and accurately, that rupture is a high-risk emergency, that women as a group have worse rupture-associated outcomes in pooled data, and that rapid care in an organized aortic center is one of the modifiable elements of that risk.

26.5Counselling and the realistic outcome envelope

Counseling in ruptured AAA should be direct, brief, and proportionate to the emergency. Families and patients, when able to participate, should be told that suspected rupture is immediately life-threatening and that the team is moving rapidly toward hemorrhage control. Avoid unsupported numerical reassurance. The evidence supports explaining that emergency endovascular-first pathways can produce early outcomes comparable to open repair and may offer longer-term survival advantages in organized systems, but that the choice depends on anatomy, physiology, and center capability.

It is equally important to separate certainty from uncertainty. It is certain that hemodynamic instability with acute back, abdominal, or flank pain in a patient with a known or detectable AAA demands urgent aortic evaluation and repair planning. It is certain that a patient who cannot tolerate CT may need direct theatre transfer. It is not certain, before imaging and operative assessment, that EVAR will be possible, because not every ruptured AAA is anatomically suitable and selection bias affects observational comparisons.

A practical counseling statement is: “This is a ruptured or suspected ruptured aortic aneurysm, which is a life-threatening bleeding emergency. We are using low-volume resuscitation to avoid worsening bleeding while preserving perfusion, and we are moving to the fastest safe route to control the aorta. If the scan and anatomy allow it, an endovascular repair may be used; if not, open repair is required.” For women, it is reasonable to add that outcomes after rupture are worse in pooled data, while experienced aortic centers may narrow that gap.

At the bedside, document the indication, timing, and escalation trigger before choosing surveillance, imaging, intervention, or deferral.