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Difficulty: MediumInitial Stabilization and Triage

An emergency medical services team brings a 64-year-old man to the resuscitation bay due to sudden-onset, agonizing chest pain that he describes as 'ripping' and radiating directly to his shoulder blades. The pain started abruptly one hour ago while he was carrying groceries. He has a known history of tobacco use and medication nonadherence for hypertension. The patient is visibly distressed, sweating profusely, and unable to find a comfortable position on the stretcher.

Vital signs:
Temperature: 37.1°C (98.8°F)
Blood pressure: 220/120 mm Hg in the right arm, 175/90 mm Hg in the left arm
Heart rate: 118/min
Respiratory rate: 24/min
Oxygen saturation: 97% on room air

An electrocardiogram demonstrates sinus tachycardia with left ventricular hypertrophy but no ST-segment or T-wave abnormalities. A stat portable chest radiograph shows a widened mediastinum.

Which of the following is the most appropriate immediate next step in the management of this patient?

  1. A
    Administer chewable aspirin and intravenous heparin
  2. B
    Obtain computed tomography angiography of the chest
  3. Administer intravenous esmololAnswer
  4. D
    Administer intravenous sodium nitroprusside
  5. E
    Perform transesophageal echocardiography

Answer

Administer intravenous esmolol
The patient's presentation of sudden-onset, tearing chest pain radiating to the back, asymmetric blood pressures, and a widened mediastinum on chest radiograph is highly suggestive of an acute aortic dissection. The immediate priority in the management of suspected aortic dissection is hemodynamic stabilization to prevent further propagation of the intimal tear and potential aortic rupture. This requires strict reduction of aortic wall shear stress (dP/dtdP/dt). Intravenous beta-blockers, such as esmolol or labetalol, decrease both the heart rate (target < 60/min) and the force of left ventricular contractility. These agents are the most appropriate first-line therapy and must be administered immediately upon clinical suspicion, prior to sending the patient for definitive diagnostic imaging.

Step-by-Step Solution

1
Evaluate the clinical presentation and vital signs.
The patient has tearing chest pain radiating to the back, asymmetric blood pressures, severe hypertension, tachycardia, and a widened mediastinum.
These findings are highly suspicious for an acute aortic dissection.
2
Determine the primary goal of immediate management.
The most urgent priority is to halt the progression of the dissection by reducing the shearing forces on the aortic wall.
Elevated heart rate and blood pressure increase aortic wall shear stress (dP/dtdP/dt), which can cause the dissection to propagate or rupture.
3
Select the appropriate initial pharmacologic intervention.
Intravenous beta-blockers (e.g., esmolol or labetalol) should be administered immediately.
Beta-blockers decrease both the heart rate and the force of left ventricular contraction, effectively lowering dP/dtdP/dt and stabilizing the patient for subsequent definitive imaging.

Key Concept

In patients with suspected acute aortic dissection, the immediate next step in management is hemodynamic stabilization with intravenous beta-blockers to reduce heart rate and blood pressure before definitive imaging is performed.
Estimated Time:1m 0s
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Topics

Initial Stabilization and Triage

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