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Difficulty: EasyCardiothoracic and Vascular Surgery

A 58-year-old man arrives at the emergency center reporting sudden, severe, tearing chest discomfort that radiates directly between his scapulae. His blood pressure is 210/115 mmHg in the right arm and 170/90 mmHg in the left arm, with a pulse of 110/min. Physical examination reveals an early diastolic murmur at the right upper sternal border. An electrocardiogram shows no acute ischemic changes, and a portable chest radiograph demonstrates a widened mediastinum. Arrange the following management steps in the most appropriate chronological order.

  1. 1Administer intravenous esmolol
  2. 2Administer intravenous sodium nitroprusside
  3. 3Obtain a computed tomography angiography (CTA) of the aorta
  4. 4Perform emergent open surgical repair

Answer

The correct sequence is to first administer intravenous esmolol, followed by intravenous sodium nitroprusside, then obtain a CTA of the aorta, and finally perform emergent open surgical repair.
The correct sequence ensures patient safety by immediately addressing the hemodynamic forces driving the dissection (controlling heart rate and contractility first, then blood pressure), followed by confirming the exact anatomy via imaging, and concluding with definitive life-saving surgery for Type A anatomy.

Step-by-Step Solution

1
Administer intravenous esmolol
Heart rate and left ventricular contractility (dP/dt) decrease.
This is the initial step in anti-impulse therapy to reduce aortic wall shear stress and prevent further propagation of the dissection.
2
Administer intravenous sodium nitroprusside
Systolic blood pressure decreases to the target of 100-120 mmHg.
Vasodilators lower blood pressure but must be given only after beta-blockade is established to prevent dangerous reflex tachycardia.
3
Obtain a computed tomography angiography (CTA) of the aorta
Confirmation of diagnosis and anatomical classification.
Definitive imaging is necessary to confirm the presence of a dissection flap and differentiate Type A from Type B, which dictates the surgical versus medical approach.
4
Perform emergent open surgical repair
Definitive treatment of the ascending aortic dissection.
Type A dissections require immediate surgical intervention due to the high risk of fatal complications like cardiac tamponade, aortic rupture, and acute aortic valve regurgitation.

Key Concept

The sequential management of acute aortic dissection dictates initial anti-impulse therapy (heart rate control followed by blood pressure control) before obtaining definitive imaging and proceeding to surgical repair.
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Topics

Cardiothoracic and Vascular Surgery

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