A 76-year-old man is brought to the emergency department after developing sudden severe lower abdominal and back pain while gardening. During transport, he became increasingly lightheaded and briefly lost consciousness. He has a history of hypertension, hyperlipidemia, chronic obstructive pulmonary disease, and tobacco use of 55 pack-years. Temperature is 36.4°C (97.5°F), blood pressure is 78/48 mm Hg, pulse is 124/min, respiratory rate is 24/min, and oxygen saturation is 95% on room air. On physical examination, he appears pale, diaphoretic, and confused. The abdomen is distended and diffusely tender. A pulsatile mass is palpable above the umbilicus. Both femoral pulses are present but diminished. The extremities are cool with delayed capillary refill. Two large-bore intravenous catheters are placed, and blood is sent for crossmatching. A focused bedside ultrasound demonstrates an infrarenal abdominal aortic aneurysm measuring approximately 7.4 cm with free fluid in the retroperitoneum.
Which of the following is the most appropriate next step in management?
The correct answer is:
B) Emergent operative repair
This patient has a ruptured abdominal aortic aneurysm causing hemorrhagic shock. The abrupt abdominal and back pain, syncope, hypotension, pulsatile abdominal mass, and bedside ultrasonographic evidence of an aneurysm with retroperitoneal fluid establish the diagnosis. He requires immediate transfer for operative repair, using endovascular aneurysm repair or open surgery according to vascular anatomy, institutional capabilities, and surgical judgment.
A ruptured abdominal aortic aneurysm causes rapid blood loss into the retroperitoneal or intraperitoneal space. Temporary tamponade by retroperitoneal tissues may limit bleeding initially, but disruption of this containment can result in sudden cardiovascular collapse. Definitive hemorrhage control must therefore not be delayed for additional diagnostic testing when the diagnosis is clear and the patient is unstable.
Initial resuscitation includes rapid vascular access, blood product preparation, correction of coagulopathy, and immediate involvement of vascular surgery. Excessive crystalloid administration should be avoided. Before proximal aortic control is obtained, a permissive hypotension strategy may be used in an alert patient with adequate vital-organ perfusion because aggressively normalizing the blood pressure can disrupt clot formation and increase hemorrhage. Blood products are preferred when resuscitation is required.
The classic triad of abdominal or back pain, hypotension, and a pulsatile abdominal mass is highly suggestive but is not present in every patient. In an older adult with risk factors and unexplained shock, rupture should remain a major consideration even when the abdominal examination is less definitive.
Answer choice A: CT angiography of the abdomen and pelvis, is incorrect.
CT angiography defines aneurysm anatomy and is useful in a hemodynamically stable patient when the diagnosis or suitability for endovascular repair requires clarification. This patient is profoundly hypotensive, has a classic presentation, and already has bedside ultrasonographic evidence of rupture. Transporting him for CT would delay hemorrhage control and could result in death during imaging.
Answer choice C: Intravenous esmolol infusion, is incorrect.
Intravenous beta blockade is central to the initial management of acute aortic dissection because reducing heart rate and contractility decreases shear stress on the aortic wall. In ruptured abdominal aortic aneurysm, however, the immediate problem is uncontrolled hemorrhage and critically reduced circulating volume. Beta blockade could further decrease cardiac output and worsen shock.
Answer choice D: Large-volume crystalloid resuscitation until systolic blood pressure exceeds 140 mm Hg, is incorrect.
Aggressive crystalloid administration can dilute clotting factors, worsen hypothermia, and increase hydrostatic pressure at the rupture site, potentially accelerating hemorrhage. Resuscitation should prioritize blood products and sufficient perfusion rather than normalization of blood pressure before definitive aortic control. Profound or worsening shock still requires active resuscitation, but large-volume crystalloid administration to a hypertensive target is harmful.
Answer choice E: Serial abdominal ultrasonography, is incorrect.
Ultrasound surveillance is appropriate for selected asymptomatic aneurysms below the threshold for repair. A symptomatic or ruptured aneurysm requires urgent intervention regardless of diameter. Repeating imaging would not alter management and would dangerously delay definitive treatment.
Key Learning Point
A hemodynamically unstable patient with suspected or confirmed ruptured abdominal aortic aneurysm requires immediate operative repair without delay for CT angiography. Resuscitation should emphasize blood products and avoidance of excessive crystalloid administration before hemorrhage control.
