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Zorluk: OrtaCardiothoracic and Vascular Surgery

A 72-year-old man visits his primary care provider to discuss a 3-month history of a persistent, dry cough and worsening shortness of breath. He reports hearing a "whistling" sound when breathing, which he initially attributed to a respiratory infection. He has a 40-pack-year smoking history. A recent trial of nebulized bronchodilators prescribed at an urgent care clinic provided no relief. Over the past month, his voice has become progressively hoarse. Blood pressure is 162/94 mm Hg in the right arm and 160/92 mm Hg in the left. Pulse is 84/min, and respirations are 20/min. Physical examination reveals a harsh, high-pitched inspiratory sound heard most prominently over the anterior neck and upper sternum. Lung fields are clear to auscultation bilaterally. Cardiac examination reveals a regular rate and rhythm with no murmurs. There is no peripheral edema. A chest radiograph demonstrates a widened mediastinum with deviation of the trachea to the right, but no focal consolidation or pleural effusion. Based on the clinical presentation and imaging findings, which of the following is the most likely underlying mechanism for this patient's respiratory and vocal symptoms?

  1. Aneurysmal dilation of the aortic arch compressing adjacent structuresCevap
  2. B
    Destruction of alveolar walls resulting in permanent airspace enlargement
  3. C
    Impaired left ventricular contractility leading to pulmonary venous congestion
  4. D
    Malignant proliferation of squamous epithelium in the central airways
  5. E
    Chronic airway inflammation causing reversible smooth muscle hyperreactivity

Cevap

Aneurysmal dilation of the aortic arch compressing adjacent structures
The correct answer describes the pathophysiology of a thoracic aortic aneurysm (TAA). The patient's presentation of a persistent cough, shortness of breath, and a harsh inspiratory sound over the anterior neck indicates stridor, which is a key sign of central airway (tracheal or mainstem bronchus) compression. The progressive hoarseness is a classic sign of left recurrent laryngeal nerve paralysis (Ortner syndrome), which occurs when an enlarging aortic arch aneurysm stretches the nerve that loops beneath it. Finally, the chest radiograph finding of a widened mediastinum without lung parenchymal infiltrates confirms a central vascular etiology rather than a primary pulmonary disease.

Adım Adım Çözüm

1
Identify the key clinical signs indicating upper airway obstruction and nerve involvement.
The patient has inspiratory stridor (the harsh 'whistling' sound over the neck) and hoarseness.
Stridor points to large/central airway compression (such as the trachea), while hoarseness indicates involvement of the recurrent laryngeal nerve.
2
Analyze the imaging findings to locate the anatomical pathology.
The chest radiograph shows a widened mediastinum with rightward tracheal deviation and no lung infiltrates.
A widened mediastinum suggests a mass or vascular enlargement in the central chest, ruling out primary alveolar or diffuse lung diseases.
3
Synthesize the findings to determine the underlying mechanism.
An enlarging thoracic aortic aneurysm (TAA) in the aortic arch explains all of the patient's findings.
The TAA widens the mediastinum, compresses the trachea (causing stridor), and stretches the left recurrent laryngeal nerve as it loops under the arch (causing hoarseness).

Anahtar Kavram

Thoracic aortic aneurysms can present with symptoms of mass effect, including stridor from tracheal compression and hoarseness from left recurrent laryngeal nerve stretching (Ortner syndrome).
Tahmini Süre:1m 30s
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Cardiothoracic and Vascular Surgery

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