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Difficulty: MediumCardiovascular System

A 62-year-old man presents to the emergency department with sudden-onset, severe, tearing chest pain that radiates directly to his back between his scapulae. The pain started 30 minutes ago while he was watching television. His medical history is significant for poorly controlled essential hypertension and a 40-pack-year smoking history. His temperature is 37.0°C (98.6°F), blood pressure is 210/110 mm Hg in the right arm and 170/95 mm Hg in the left arm, heart rate is 112/min, and respiratory rate is 20/min. Physical examination reveals an early diastolic decrescendo murmur at the right upper sternal border. An electrocardiogram shows sinus tachycardia with no ischemic changes. A chest radiograph reveals a widened mediastinum. Based on the most likely diagnosis, arrange the following management steps in the most appropriate chronological sequence.

  1. 1Initiate intravenous esmolol therapy
  2. 2Initiate intravenous sodium nitroprusside therapy
  3. 3Obtain computed tomography angiography (CTA) of the chest
  4. 4Consult cardiothoracic surgery for definitive repair

Answer

The correct sequential order for managing suspected acute aortic dissection is to first initiate intravenous beta-blockade, followed by intravenous vasodilator therapy, then obtain confirmatory imaging, and finally obtain a surgical consultation for definitive repair.
The correct sequence prioritizes immediate anti-impulse therapy to prevent aortic rupture, followed by diagnostic confirmation, and ultimately definitive surgical management. Beta-blockers must explicitly precede vasodilators.

Step-by-Step Solution

1
Identify the clinical presentation as highly suspicious for an acute aortic dissection.
The patient has tearing chest pain, asymmetric blood pressures, a widened mediastinum, and a new aortic regurgitation murmur.
Recognizing the classic signs of aortic dissection is necessary to rapidly initiate life-saving anti-impulse therapy.
2
Determine the first priority in medical stabilization.
Heart rate must be lowered first using an intravenous beta-blocker (e.g., esmolol) to a target of < 60/min.
Beta-blockers decrease left ventricular contractility (dP/dt) and reduce the shear stress on the aortic wall, minimizing the chance of further dissection or rupture.
3
Determine the next step in medical stabilization.
Add an intravenous vasodilator (e.g., sodium nitroprusside) to lower systolic blood pressure to 100-120 mm Hg.
Vasodilators must only be given after beta-blockade to prevent reflex sympathetic activation and worsening of the dissection.
4
Determine the role of diagnostic imaging.
Safely transport the hemodynamically optimized patient to obtain a CTA of the chest.
Imaging is necessary to confirm the diagnosis and classify the extent of the dissection (Stanford Type A vs. Type B).
5
Determine the definitive treatment based on presentation.
Consult cardiothoracic surgery.
The early diastolic murmur indicates aortic valve involvement (Stanford Type A), which requires emergent operative repair.

Key Concept

In acute aortic dissection, medical therapy must be sequenced with intravenous beta-blockers administered before vasodilators to prevent reflex tachycardia and increased aortic shear stress, followed by confirmatory imaging and appropriate surgical management.
Estimated Time:1m 30s
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Topics

Cardiovascular System

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