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Zorluk: Çok zorCardiothoracic and Vascular Surgery

A 62-year-old man is brought to the emergency department via ambulance due to the sudden onset of excruciating, tearing anterior chest pain that radiates to his interscapular region. Minutes after the pain began, he developed severe shortness of breath. His past medical history is significant for poorly controlled hypertension, hyperlipidemia, and severe chronic obstructive pulmonary disease. Upon arrival, he appears ashen, diaphoretic, and in severe respiratory distress. His temperature is 36.8°C (98.2°F), blood pressure is 82/45 mmHg in the right arm and 80/42 mmHg in the left arm, heart rate is 128/min, and respiratory rate is 34/min with an oxygen saturation of 86% on room air. Physical examination reveals elevated jugular venous pressure. Lung auscultation demonstrates diffuse bilateral crackles extending to the apices, along with prominent expiratory wheezing. Cardiac auscultation reveals a regular tachycardia with a loud, blowing, decrescendo diastolic murmur heard best at the right second intercostal space. The abdomen is soft and non-tender. Bilateral lower extremities are cool to the touch with faint pedal pulses. Electrocardiogram shows sinus tachycardia with non-specific ST-segment changes. Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Administer intravenous esmolol and sodium nitroprusside to rapidly decrease sheer stress on the aorta
  2. B
    Transport the patient immediately to the radiology suite for computed tomography angiography of the chest
  3. Perform bedside transesophageal echocardiography and obtain an emergent surgical consultationCevap
  4. D
    Administer intravenous furosemide, inhaled bronchodilators, and initiate noninvasive positive pressure ventilation
  5. E
    Initiate intravenous broad-spectrum antibiotics and obtain blood cultures

Cevap

The most appropriate next step is to perform bedside transesophageal echocardiography and obtain an emergent surgical consultation.
The correct answer involves immediate bedside diagnosis and surgical consultation. The patient's presentation of sudden tearing chest pain and a new diastolic murmur is classic for an acute ascending (Type A) aortic dissection resulting in acute aortic regurgitation. This has precipitated acute pulmonary edema and cardiogenic shock, evidenced by profound hypotension, JVD, and diffuse crackles. In any hemodynamically unstable patient with a suspected aortic dissection, transport to the CT scanner is contraindicated due to the high risk of cardiovascular collapse. Bedside transesophageal echocardiography (TEE) is the most appropriate next step as it is highly sensitive and specific for ascending dissections, can assess the degree of aortic regurgitation, and does not require moving the patient. Concurrent emergent cardiothoracic surgery consultation is mandatory, as definitive treatment is immediate open surgical repair.

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1
Analyze the primary clinical presentation.
The patient has sudden, tearing chest pain radiating to the back, accompanied by a new decrescendo diastolic murmur.
This triad is highly specific for an acute Type A aortic dissection complicated by retrograde extension into the aortic root, causing acute aortic valve regurgitation.
2
Evaluate the secondary symptoms and hemodynamic status.
The patient is in cardiogenic shock (blood pressure 82/45 mmHg, cool extremities) and has acute pulmonary edema (crackles, severe dyspnea, JVD).
The acute failure of the aortic valve leads to rapid left ventricular volume overload, elevated left-sided filling pressures, and subsequent right-sided failure, resulting in profound shock and pulmonary edema.
3
Determine the optimal diagnostic modality based on stability.
Computed tomography angiography is unsafe due to severe hypotension. A bedside transesophageal echocardiogram (TEE) is indicated.
TEE can be performed rapidly at the bedside in the resuscitation bay without risking transport. It effectively visualizes the ascending aorta and assesses aortic valve function.
4
Identify the definitive therapeutic intervention.
Emergent cardiothoracic surgical repair is required.
Acute Type A aortic dissection has a high mortality rate that increases by the hour; immediate surgical intervention is the only definitive treatment.

Anahtar Kavram

Management of hemodynamically unstable acute Type A aortic dissection
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Konular

Cardiothoracic and Vascular Surgery

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