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Difficulty: MediumCardiothoracic and Vascular Surgery

Emergency medical services bring a 6969-year-old man to the trauma bay after he experienced a sudden, agonizing tearing pain in his mid-abdomen that radiates to his lower back. He has a 4545-pack-year smoking history and a history of poorly controlled hypertension. Upon arrival, the patient is obtunded, pale, and diaphoretic. His vital signs show a temperature of 36.2∘C36.2^\circ\text{C} (97.2∘F97.2^\circ\text{F}), a blood pressure of 72/40 mm Hg72/40\text{ mm Hg}, and a regular heart rate of 124/min124/\text{min}. Abdominal examination reveals a prominent, expansile, and pulsatile mass extending just above the umbilicus. Arrange the following diagnostic and therapeutic interventions in the most appropriate chronological sequence for the standard management of this patient.

  1. 1Placement of bilateral large-bore peripheral intravenous lines and initiation of a massive transfusion protocol
  2. 2Performance of bedside point-of-care abdominal ultrasonography
  3. 3Immediate transfer to the operating room for emergent exploratory laparotomy
  4. 4Application of a supraceliac aortic cross-clamp
  5. 5Interposition of a synthetic prosthetic vascular graft

Answer

The correct sequence prioritizes immediate resuscitation, followed by rapid bedside diagnostic confirmation, urgent surgical exploration, proximal hemorrhage control, and finally definitive vascular reconstruction.
The standard sequence for managing a hemodynamically unstable ruptured abdominal aortic aneurysm strictly prioritizes life support (intravenous access and blood products) followed immediately by rapid, non-delaying diagnosis (bedside ultrasound). Once the diagnosis is confirmed, the patient must be transferred directly to the operating room, bypassing the CT scanner entirely. Once in the operating room, fundamental surgical principles dictate that proximal vascular control (aortic cross-clamping) must precede the opening of the aneurysm sac and placement of the prosthetic graft.

Step-by-Step Solution

1
Secure airway, breathing, and circulation (ABC) and initiate resuscitation.
Large-bore intravenous lines are placed and uncrossmatched blood products are administered.
The patient is presenting in profound hemorrhagic shock requiring immediate intravascular volume expansion.
2
Confirm the suspected diagnosis rapidly.
A bedside abdominal ultrasound is performed in the trauma bay, identifying a large abdominal aortic aneurysm.
Hemodynamically unstable patients should never be sent for a computed tomography (CT) scan; bedside ultrasound provides immediate diagnostic confirmation.
3
Proceed directly to definitive care.
The patient is transported emergently to the operating room.
A ruptured abdominal aortic aneurysm requires emergent laparotomy to prevent fatal exsanguination.
4
Obtain proximal vascular control.
The surgeon applies an aortic cross-clamp, often at the supraceliac level.
Surgical control of the arterial inflow must be achieved before the retroperitoneal hematoma is disturbed; otherwise, uncontrollable bleeding will occur.
5
Perform the definitive structural repair.
A synthetic vascular tube graft is sewn into the aorta.
Once the bleeding is definitively stopped, arterial continuity to the distal aorta and lower extremities must be reconstructed.

Key Concept

Management algorithm for a hemodynamically unstable patient with a ruptured Abdominal Aortic Aneurysm (AAA)
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Topics

Cardiothoracic and Vascular Surgery

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