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Zorluk: OrtaCardiovascular System

During a routine workplace health screening, an occupational physician evaluates a veteran mechanic who has been struggling to walk across the garage floor without stopping to catch his breath over the past month. The patient reports waking up multiple times at night feeling suffocated, a sensation that improves after sitting on the edge of his bed for several minutes. He has smoked a pack of cigarettes daily for thirty years. Blood pressure is 142/88 mm Hg, heart rate is 98/min, and respiratory rate is 20/min. Physical examination reveals an apical impulse palpated in the sixth intercostal space, anterior to the midaxillary line. Auscultation identifies an extra low-frequency heart sound occurring just after S2. Lung auscultation demonstrates fine inspiratory crackles in the dependent zones bilaterally without wheezing or prolonged expiration. Which of the following is the most appropriate initial diagnostic test to establish the underlying cause of this patient's symptoms?

  1. Transthoracic echocardiographyCevap
  2. B
    Pulmonary function testing
  3. C
    Trial of nebulized albuterol and ipratropium
  4. D
    Measurement of arterial blood gases
  5. E
    High-resolution computed tomography of the chest

Cevap

Transthoracic echocardiography is the correct next step to establish the diagnosis of heart failure.
The correct answer is the imaging modality that evaluates cardiac function. This patient presents with exertional dyspnea, orthopnea (waking up feeling suffocated and relieved by sitting), a laterally displaced point of maximal impulse, and an S3 gallop (extra low-frequency heart sound after S2). These findings are highly specific for heart failure with left ventricular systolic dysfunction and volume overload. Transthoracic echocardiography is the gold standard initial non-invasive test to evaluate ejection fraction, ventricular dimensions, and structural heart abnormalities.

Adım Adım Çözüm

1
Identify the primary clinical syndrome based on symptoms and physical exam findings.
The patient has orthopnea, a laterally displaced point of maximal impulse, an S3 gallop, and basilar crackles.
These are highly specific signs of left ventricular dilation, volume overload, and reduced ejection fraction, indicating heart failure rather than primary pulmonary disease.
2
Select the appropriate diagnostic modality to confirm the suspected underlying pathology.
Transthoracic echocardiography is selected.
Echocardiography allows for direct, non-invasive visualization of myocardial function, chamber dimensions, and valvular competence, definitively diagnosing heart failure.

Anahtar Kavram

Patients with a heavy smoking history can present with dyspnea due to either COPD or heart failure; specific signs like a displaced apical impulse and an S3 gallop strongly differentiate heart failure, necessitating echocardiography for diagnosis.
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Cardiovascular System

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