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Zorluk: OrtaCardiovascular System

An emergency response team brings a 59-year-old woman to the resuscitation bay after she experienced a sudden onset of profound weakness and severe breathlessness at home. Her past medical history is significant for advanced non-small cell lung cancer and severe chronic obstructive pulmonary disease. On arrival, her blood pressure is 82/54 mm Hg, heart rate is 124/min, and respiratory rate is 26/min. Oxygen saturation is 94% on 2 L/min via nasal cannula. Physical examination reveals prominent jugular venous distention. The lung fields have scattered end-expiratory wheezes, but no crackles are heard. Cardiac auscultation demonstrates distant, muffled heart sounds. The patient's radial pulse is weak, and its amplitude noticeably diminishes during inspiration. Which of the following is the most appropriate next step in the management of this patient?

  1. Perform bedside transthoracic echocardiographyCevap
  2. B
    Initiate systemic glucocorticoids and inhaled bronchodilators
  3. C
    Transport the patient for computed tomography pulmonary angiography
  4. D
    Administer an intravenous bolus of loop diuretics
  5. E
    Commence empiric therapy with broad-spectrum antimicrobial agents

Cevap

Perform bedside transthoracic echocardiography
The patient's presentation of hypotension, tachycardia, jugular venous distention, and muffled heart sounds constitutes Beck's triad, which is the classic presentation of cardiac tamponade. The noticeable decrease in pulse amplitude during inspiration represents pulsus paradoxus, another hallmark of this condition. Given her history of advanced lung cancer, she has likely developed a malignant pericardial effusion. In a hemodynamically unstable patient with suspected cardiac tamponade, bedside transthoracic echocardiography is the most appropriate immediate diagnostic step. It can rapidly confirm the diagnosis by visualizing the pericardial fluid and right ventricular diastolic collapse before proceeding with a life-saving pericardiocentesis.

Adım Adım Çözüm

1
Analyze the vital signs and physical examination findings.
The patient exhibits hypotension and tachycardia (shock), prominent jugular venous distention, muffled heart sounds, and pulsus paradoxus.
To identify the pathophysiological mechanism of the patient's acute deterioration.
2
Formulate a primary differential diagnosis based on the clinical triad.
The combination of hypotension, jugular venous distention, and muffled heart sounds is Beck's triad, highly specific for cardiac tamponade, likely secondary to a malignant pericardial effusion from her lung cancer.
To rule out other causes of dyspnea in a patient with underlying lung disease, such as a COPD exacerbation or pneumonia.
3
Determine the safest and most effective initial management step.
Bedside transthoracic echocardiography is selected to immediately visualize the pericardial effusion and right ventricular diastolic collapse.
The patient is too unstable to be moved to a CT scanner, and empiric medical therapies (like diuretics or bronchodilators) are either contraindicated or fail to address the obstructive shock.

Anahtar Kavram

Diagnosis and initial management of cardiac tamponade
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Konular

Cardiovascular System

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