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Difficulty: HardCardiothoracic and Vascular Surgery

A 52-year-old woman is evaluated in the emergency department for abrupt, agonizing chest pain that she describes as 'ripping' and radiating to her mid-back. Her pulse is 115/min and blood pressure is 215/115 mm Hg in the right upper extremity and 175/90 mm Hg in the left. A plain chest radiograph demonstrates mediastinal widening. Arrange the following clinical interventions in the most appropriate chronological sequence for optimal management of this patient's suspected pathology.

  1. 1Initiation of an intravenous esmolol infusion
  2. 2Initiation of an intravenous sodium nitroprusside infusion
  3. 3Computed tomography angiography of the aorta
  4. 4Transfer to the operating room for surgical repair

Answer

The correct chronological sequence is: Initiation of an intravenous esmolol infusion, followed by initiation of an intravenous sodium nitroprusside infusion, then computed tomography angiography of the aorta, and finally transfer to the operating room for surgical repair.
The precise chronological management of a patient with suspected acute aortic dissection prioritizes strict hemodynamic control to prevent immediate catastrophic rupture or extension, followed by definitive diagnosis and treatment. The first step is anti-impulse therapy with an intravenous beta-blocker (esmolol) to decrease the heart rate and the rate of rise of left ventricular pressure (dP/dt). Once beta-blockade is established, if the patient remains hypertensive, a vasodilator (sodium nitroprusside) is initiated to reduce systolic blood pressure to 100-120 mm Hg. Following hemodynamic stabilization, computed tomography angiography is obtained to confirm the diagnosis and classify the dissection (Stanford Type A vs. Type B). Finally, upon confirmation of a Stanford Type A dissection, the patient is urgently transferred to the operating room for surgical repair.

Step-by-Step Solution

1
Control heart rate and wall shear stress
Initiate intravenous esmolol infusion
First-line medical therapy for suspected acute aortic dissection is heart rate control (target <60/min) to reduce aortic wall shear stress (dP/dt) and prevent propagation of the intimal tear.
2
Control blood pressure
Initiate intravenous sodium nitroprusside infusion
Vasodilators are added second to achieve a target systolic blood pressure of 100-120 mm Hg. They must never precede beta-blockers due to the risk of reflex tachycardia.
3
Confirm the diagnosis and anatomical extent
Obtain computed tomography angiography
With hemodynamics temporarily stabilized, cross-sectional imaging is safely performed to differentiate Stanford Type A from Type B dissection, which dictates further management.
4
Provide definitive treatment
Transfer to the operating room
Given the likely Type A dissection (indicated by unequal arm pressures suggesting brachiocephalic trunk involvement), emergent open surgical repair is the definitive treatment following anatomical confirmation.

Key Concept

Sequential hemodynamic management of acute aortic dissection (anti-impulse therapy followed by vasodilation) prior to diagnostic imaging and definitive surgery.
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Topics

Cardiothoracic and Vascular Surgery

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