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Difficulty: MediumCardiovascular System

A 5858-year-old man is brought to the emergency department complaining of sudden-onset, severe, "tearing" chest pain that radiates to his back. He appears diaphoretic and is in acute distress. Vital signs show a blood pressure of 210/115210/115 mmHg in the right arm and 175/95175/95 mmHg in the left arm, a heart rate of 112112/min, and a respiratory rate of 2020/min. An electrocardiogram shows sinus tachycardia with no ST-segment or T-wave abnormalities. A portable chest x-ray reveals a widened mediastinum. Arrange the following steps in the most appropriate chronological order for the acute management of this patient.

  1. 1Initiate intravenous esmolol therapy
  2. 2Initiate intravenous nitroprusside therapy
  3. 3Obtain computed tomography (CT) angiography of the aorta
  4. 4Obtain an emergency cardiothoracic surgery consultation

Answer

The correct sequence is to first initiate intravenous esmolol, followed by intravenous nitroprusside, then obtain a CT angiography of the aorta, and finally consult cardiothoracic surgery.
The correct sequence strictly prioritizes hemodynamic stabilization using anti-impulse therapy before obtaining definitive imaging and surgical consultation. Intravenous beta-blockers (e.g., esmolol) must be administered first to decrease the heart rate and reduce the force of left ventricular ejection. Only after adequate beta-blockade is established should a vasodilator (e.g., nitroprusside) be initiated to further lower the blood pressure safely. Proceeding to CT angiography and subsequent surgical consultation should only occur after the patient's hemodynamics are strictly controlled to minimize the risk of acute aortic rupture during transport and evaluation.

Step-by-Step Solution

1
Assess hemodynamics and establish clinical goals.
Identify a hypertensive emergency in the setting of a highly suspected acute aortic dissection.
Targeting a heart rate less than 6060/min and a systolic blood pressure of 100100 to 120120 mmHg is required immediately to prevent dissection propagation.
2
Administer a negative inotrope and chronotrope.
Intravenous esmolol (or labetalol) is given as the first pharmacological intervention.
Beta-blockade decreases dP/dt and prevents the reflex tachycardia that would otherwise occur from subsequent vasodilator use.
3
Administer a vasodilator.
Intravenous nitroprusside is added.
Provides necessary afterload reduction to meet strict systolic blood pressure goals, safely administered only after the heart rate is controlled.
4
Confirm the diagnosis with definitive imaging.
CT angiography of the aorta is performed.
Visualizes the intimal flap and classifies the dissection anatomically (Stanford type A or B), which dictates definitive management.
5
Determine definitive treatment based on anatomy.
Cardiothoracic surgery is consulted.
Type A dissections (and complicated Type B dissections) require emergent surgical or endovascular intervention.

Key Concept

In the acute management of aortic dissection, anti-impulse therapy must be initiated with a beta-blocker before any vasodilators are given, and hemodynamic stabilization must precede transport for advanced imaging.
Estimated Time:1m 30s
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Topics

Cardiovascular System

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