Examkin

Question

Difficulty: MediumCardiovascular System

A 66-year-old man presents to the emergency department with the sudden onset of severe, tearing chest pain that radiates to his back. He appears diaphoretic and in severe distress. Blood pressure is 188/112 mm Hg in the right arm and 156/94 mm Hg in the left arm. Pulse is 112/min and bounding. Cardiac auscultation reveals a new decrescendo diastolic murmur at the right upper sternal border. An electrocardiogram shows sinus tachycardia with no ST-segment or T-wave changes. Suspecting an acute aortic syndrome, the physician prepares to manage the patient.

Arrange the following next steps in the most appropriate chronological order for the initial stabilization and management of this patient.

  1. 1Administer intravenous esmolol
  2. 2Administer intravenous sodium nitroprusside
  3. 3Perform computed tomography angiography of the aorta
  4. 4Consult cardiothoracic surgery for emergent repair

Answer

The correct sequence is to first administer intravenous beta-blockers (esmolol), followed by intravenous vasodilators (sodium nitroprusside), then perform computed tomography angiography, and finally consult cardiothoracic surgery.
The priority in suspected acute aortic dissection is immediate 'anti-impulse' therapy to halt the progression of the intimal tear. This requires lowering both the heart rate and the blood pressure. Beta-blockers (like esmolol) must be given first to blunt reflex tachycardia and decrease ventricular contractility (dP/dt). Once the heart rate is controlled (< 60/min), a vasodilator (like nitroprusside) is added to safely lower the systolic blood pressure (< 120 mm Hg). Hemodynamic stabilization is imperative before transporting the patient for definitive CTA imaging, which then guides the emergent cardiothoracic surgical consultation for a Type A dissection.

Step-by-Step Solution

1
Administer intravenous esmolol
Decreases heart rate to < 60/min and reduces left ventricular contractility (dP/dt).
Minimizing the shearing forces on the fragile aortic wall is the highest immediate priority to prevent dissection propagation and catastrophic rupture.
2
Administer intravenous sodium nitroprusside
Lowers systolic blood pressure to the target of 100-120 mm Hg.
Vasodilators must strictly be given after beta-blockade to prevent reflex sympathetic activation, which would otherwise increase heart rate and shear stress.
3
Perform computed tomography angiography of the aorta
Provides definitive anatomical visualization of the intimal flap and extent of the dissection.
Required to confirm the diagnosis, differentiate Type A (ascending) from Type B (descending) dissection, and map the anatomy for the surgical team.
4
Consult cardiothoracic surgery for emergent repair
Prepares the patient for definitive operative intervention.
Stanford Type A dissections carry a high mortality rate with medical management alone and require emergent surgical repair.

Key Concept

In the acute management of aortic dissection, anti-impulse therapy requires the administration of beta-blockers before vasodilators to prevent reflex tachycardia and increased aortic shear stress, followed by imaging and surgical consultation.
Estimated Time:1m 30s
Rate this question

Topics

Cardiovascular System

More questions from this topic