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Difficulty: MediumCardiovascular System

A 64-year-old man arrives at the emergency department reporting the abrupt onset of severe, tearing chest pain that radiates between his shoulder blades. His blood pressure is 210/120 mmHg in the right arm and 180/100 mmHg in the left arm, with a heart rate of 118/min. Physical examination reveals a new diastolic decrescendo murmur at the right upper sternal border. An acute aortic dissection is highly suspected. Arrange the following steps in the most appropriate clinical sequence for the evaluation and management of this patient.

  1. 1Obtain a 12-lead electrocardiogram
  2. 2Administer intravenous esmolol
  3. 3Administer intravenous sodium nitroprusside
  4. 4Perform computed tomography angiography of the aorta
  5. 5Consult cardiothoracic surgery

Answer

The correct clinical sequence is: Obtain a 12-lead electrocardiogram, administer intravenous esmolol, administer intravenous sodium nitroprusside, perform computed tomography angiography, and finally consult cardiothoracic surgery.
The correct sequence ensures patient safety by prioritizing immediate life-threat exclusion, followed by stepwise hemodynamic optimization (heart rate control before vasodilation to prevent reflex tachycardia), securing a definitive diagnosis, and ultimate surgical intervention.

Step-by-Step Solution

1
Evaluate for immediate life-threatening cardiac complications
A 12-lead electrocardiogram is obtained.
Rapid triage requires ruling out or identifying an ST-segment elevation myocardial infarction, which dictates distinct immediate pathways and alerts the clinician to coronary ostial involvement.
2
Initiate negative inotropic therapy
Intravenous esmolol is administered.
Decreasing the heart rate and left ventricular contractility minimizes aortic wall shear stress, which limits the propagation of the dissection flap.
3
Initiate vasodilator therapy
Intravenous sodium nitroprusside is added.
Further blood pressure reduction is necessary; however, vasodilators must only be given after adequate beta-blockade to prevent reflex sympathetic activation.
4
Obtain definitive diagnostic imaging
Computed tomography angiography is performed.
Stabilized patients require precise anatomic localization to determine if surgical or continued medical management is indicated.
5
Proceed to definitive treatment
Cardiothoracic surgery is consulted.
Type A aortic dissections carry a high mortality rate and require emergent surgical repair.

Key Concept

The management sequence for acute aortic dissection requires initial diagnostic triage (ECG), stepwise medical stabilization (beta-blocker followed by vasodilator), definitive imaging (CTA), and surgical consultation for Type A lesions.
Estimated Time:1m 30s
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Topics

Cardiovascular System

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