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Difficulty: MediumCardiothoracic and Vascular Surgery

A 64-year-old man is brought to the emergency department via ambulance due to sudden-onset, excruciating chest pain that he describes as 'ripping' and radiating to his interscapular region. He has a history of poorly controlled hypertension. His temperature is 37.1°C (98.8°F), blood pressure is 215/115 mm Hg in his right arm and 175/95 mm Hg in his left arm, heart rate is 118/min, and oxygen saturation is 96% on room air. Cardiac auscultation reveals a new early diastolic murmur at the right upper sternal border. An intravenous line is established. Arrange the following subsequent steps in the patient's evaluation and management in the most appropriate chronological order.

  1. 1Obtain a 12-lead electrocardiogram
  2. 2Administer intravenous esmolol
  3. 3Administer intravenous nitroprusside
  4. 4Perform computed tomography angiography of the aorta
  5. 5Proceed to the operating room for surgical repair

Answer

The correct sequence is to first obtain a 12-lead electrocardiogram, followed by administering an intravenous beta-blocker (esmolol), and then an intravenous vasodilator (nitroprusside). Once medically stabilized, perform a computed tomography angiography of the aorta, and finally, proceed to the operating room for surgical repair.
The patient presents with classic signs of acute aortic dissection, including tearing chest pain, asymmetric blood pressures, and a new murmur of aortic regurgitation suggestive of ascending aorta involvement. The management sequence begins with a rapid 12-lead electrocardiogram to evaluate for concurrent myocardial infarction. Immediate pharmacologic therapy must then be instituted to reduce aortic shear stress; this requires a beta-blocker first to lower heart rate and contractility, followed by a vasodilator to lower blood pressure. Once the patient is medically stabilized, definitive imaging with a computed tomography angiography is indicated to confirm the anatomy. Finally, confirmed Type A dissections require emergent transfer to the operating room for surgical repair.

Step-by-Step Solution

1
Recognize the clinical presentation of an acute aortic dissection.
The patient's 'tearing' chest pain, asymmetric blood pressures, and early diastolic murmur strongly suggest a Stanford Type A dissection.
Identifying the suspected pathology guides the urgency and sequence of required interventions.
2
Prioritize initial diagnostic triage for chest pain.
Obtain a 12-lead electrocardiogram.
An electrocardiogram rapidly evaluates for myocardial ischemia or infarction, which can mimic or complicate an aortic dissection.
3
Initiate anti-impulse medical therapy.
Administer an intravenous beta-blocker (esmolol).
Beta-blockers reduce heart rate and left ventricular contractility, decreasing shear stress on the aortic wall and preventing further dissection propagation.
4
Achieve strict blood pressure control.
Administer an intravenous vasodilator (nitroprusside).
After beta-blockade is established, vasodilators are used to further lower blood pressure. They must never precede beta-blockers to avoid reflex tachycardia.
5
Confirm the diagnosis anatomically.
Perform a computed tomography angiography of the aorta.
Once the patient's heart rate and blood pressure are stabilized, advanced imaging is required to definitively diagnose the dissection and determine its anatomic extent.
6
Provide definitive treatment.
Proceed to the operating room for surgical repair.
Type A dissections have a high risk of fatal complications like cardiac tamponade or rupture and require emergent surgical intervention.

Key Concept

The sequential management of a hemodynamically stable acute aortic dissection involves initial electrocardiogram triage, immediate anti-impulse therapy (beta-blocker followed by vasodilator), anatomic confirmation with computed tomography angiography, and definitive surgical repair for Type A dissections.
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Topics

Cardiothoracic and Vascular Surgery

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