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Difficulty: MediumDiagnostic Workup and Test Sequencing

A retired construction worker, 68 years of age, is evaluated in the critical care resuscitation bay shortly after experiencing a sudden, excruciating pain between his shoulder blades that he describes as "ripping." He has a history of poorly controlled hypertension and tobacco use. Vital signs reveal a heart rate of 122/min, a respiratory rate of 22/min, and a blood pressure of 78/40 mm Hg in the right arm. On physical examination, the patient is visibly diaphoretic, pale, and lethargic. Cardiopulmonary auscultation reveals a new, faint early decrescendo diastolic murmur at the right upper sternal border. The lungs are clear to auscultation bilaterally. Electrocardiography demonstrates sinus tachycardia with non-specific ST-segment changes. Intravenous fluid resuscitation is immediately initiated via two large-bore peripheral catheters. Which of the following is the most appropriate next step in the diagnostic workup?

  1. Transesophageal echocardiographyAnswer
  2. B
    Computed tomography angiography of the chest
  3. C
    Transthoracic echocardiography
  4. D
    Invasive coronary angiography
  5. E
    Measurement of serum D-dimer levels

Answer

Transesophageal echocardiography
This patient's presentation of sudden-onset, 'ripping' back pain combined with a new diastolic decrescendo murmur (indicating acute aortic regurgitation) is highly suspicious for an acute ascending aortic dissection (Stanford type A). The patient is in hemodynamic shock, which in this context can result from aortic rupture, cardiac tamponade, or acute severe aortic valve incompetence. When selecting the next step in the diagnostic workup for a suspected aortic dissection, the patient's hemodynamic stability is the most critical deciding factor. For hemodynamically unstable patients, transesophageal echocardiography is the most appropriate next step. It provides excellent visualization of the ascending aorta and aortic valve, boasts high sensitivity and specificity, and crucially, can be performed rapidly at the bedside or in the operating room. This prevents the dangerous transport of an unstable patient away from the resuscitation area.

Step-by-Step Solution

1
Identify the primary clinical syndrome based on the presentation.
Sudden, tearing back pain with a new decrescendo diastolic murmur (aortic regurgitation) strongly suggests an acute ascending aortic dissection.
Recognizing the classic triad of tearing pain, pulse/blood pressure differentials, and widening mediastinum or new murmur narrows the differential diagnosis.
2
Assess the patient's hemodynamic stability.
The patient is hypotensive, tachycardic, diaphoretic, and lethargic, indicating hemodynamic instability and shock.
Hemodynamic status dictates whether the patient can be safely transported for imaging or if bedside imaging is mandatory.
3
Select the appropriate diagnostic imaging modality.
Transesophageal echocardiography is chosen.
It offers high sensitivity and specificity for aortic dissection and can be performed at the bedside in the emergency department or operating room, maintaining patient safety.

Key Concept

In hemodynamically unstable patients with suspected acute aortic dissection, bedside transesophageal echocardiography (TEE) is the diagnostic imaging modality of choice to avoid the risks of transporting an unstable patient to the radiology suite.

Alternative Method

In some specialized trauma centers with 'hybrid' operating rooms, the patient might be taken directly to the OR where both resuscitation and advanced imaging (like intraoperative TEE or portable CT) can occur simultaneously.
Estimated Time:1m 30s
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Diagnostic Workup and Test Sequencing

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