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Vascular·CA-2

Vascular: Ruptured AAA

Emergency repair of a ruptured abdominal aortic aneurysm. Manage cross-clamp physiology and massive transfusion protocols.

The stem

A 74 y.o. male presents to the ED with sudden onset of excruciating back pain and syncope. BP is 80/40. History of HTN and 50 pack-year smoking. You are called to the OR for immediate surgical repair of a suspected ruptured AAA...

Focus

Cross-clamp hemodynamics, renal protection, and massive transfusion logic.

Examination relevance

High-yield for technical management of major vascular emergencies.

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Expert sample response

A ruptured AAA is a surgical and anesthetic emergency requiring immediate control. My primary goal is 'permissive hypotension' (MAP ~55-65 mmHg) until the proximal cross-clamp is applied to avoid worsening the rupture.

I will secure large-bore IV access (14G or Cordis) and have the Level-1 Rapid Infuser ready with uncrossmatched O-negative blood. Induction will be a controlled Rapid Sequence Induction (RSI), likely with etomidate and succinylcholine, only when the surgeon is scrubbed and the patient is prepped and draped to allow for immediate incision if hypotension worsens upon loss of sympathetic tone. I will manage the metabolic fallout of the cross-clamp release (hyperkalemia, acidosis) with bicarbonate, calcium, and hyperventilation, and I will strictly monitor renal function throughout the recovery phase.

Full walkthrough

What the Examiner Is Testing

This case tests whether you understand permissive hypotension — keeping the MAP at 55-65 until the cross-clamp is applied — and why inducing anesthesia before that is dangerous. The examiner also wants to hear your management of the metabolic consequences of aortic cross-clamping and release.

The Board Trap

The trap is intubating the patient immediately in the ED or outside the OR, before the surgeon is ready to cut. Loss of sympathetic tone on induction will drop the BP precipitously — the tamponade effect from the retroperitoneal hematoma is the only thing keeping this patient alive. Premature induction equals exsanguination.

Walk-Through: How This Case Plays Out

Examiner: The patient arrives to the OR with a BP of 80/40 and is barely responsive. What do you do first?

Me: I would not induce immediately. I want the surgeon scrubbed, the patient prepped and draped, and the OR ready for immediate incision. I'm establishing large-bore access — 14G IVs or a Cordis sheath — and running uncrossmatched O-negative blood. The retroperitoneal hematoma is providing tamponade. The second I give propofol or even etomidate, I lose that sympathetic tone and the BP could hit zero before I can intubate.

Examiner: The surgeon is ready. How do you induce?

Me: I would use etomidate and succinylcholine — low-dose, modified RSI. Ketamine is also reasonable if I want to lean on the sympathomimetic effect. I'm giving the minimum to get the airway — not a full induction dose. Surgeon has a scalpel in hand before I push anything. The moment the tube is in and confirmed, they cut.

Examiner: The aortic cross-clamp goes on. What are you watching for?

Me: I'm watching for hypertension — the afterload spikes dramatically when you clamp above the renals. I'd use a vasodilator to manage the BP, probably sodium nitroprusside or nicardipine. I'm also watching for myocardial ischemia on the 5-lead EKG, because the LV is suddenly working against a much higher afterload. I want the MAP controlled — not too high, not too low.

Examiner: The clamp comes off. Now what?

Me: Now I'm ready for the crash. Reperfusion drops the SVR dramatically — ischemic metabolites, lactate, potassium all wash back. I'd have vasopressors running: norepinephrine infusion primed, phenylephrine boluses ready. I'd push bicarbonate before clamp release to buffer the incoming acidosis. Calcium chloride for the potassium surge. Hyperventilate to blow off CO2. And I'm watching the EKG for peaked T-waves indicating hyperkalemia.

Key Phrases That Score Points

  • "Permissive hypotension — I'm targeting MAP 55-65 until the proximal clamp is on."
  • "Surgeon has a scalpel in hand before I push any induction agent — not a second before."
  • "The retroperitoneal hematoma is tamponading the rupture. Induction kills that effect."
  • "Calcium chloride before clamp release — I'm expecting hyperkalemia and I want to be ahead of it."
  • "This is a DCR trauma approach: blood products in a 1:1:1 ratio, not crystalloid flooding."

Why This Case Appears on the Boards

Ruptured AAA is the prototypical "do not induce early" vascular case. It tests both the physiologic knowledge of cross-clamp hemodynamics and the clinical courage to hold off on doing something while the patient looks terrible in front of you.