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Zorluk: OrtaDiagnostic Workup and Test Sequencing

A 62-year-old man comes to the clinic reporting a 3-week history of progressively worsening shortness of breath, particularly when walking upstairs. He also reports waking up twice at night gasping for air and has noticed swelling in his ankles. He has a 10-year history of hypertension currently managed with amlodipine. Vital signs are temperature 37.0∘C37.0^\circ\text{C} (98.6∘F98.6^\circ\text{F}), blood pressure 158/92158/92 mmHg, pulse 9292/min, and respirations 1818/min. Physical examination reveals elevated jugular venous pressure, bibasilar lung crackles, and 2+ bilateral pitting pedal edema. A new S3S_3 gallop is auscultated. The physician suspects new-onset heart failure.

Which of the following diagnostic tests should be included in the initial workup for this patient? (Select all that apply)

  1. Transthoracic echocardiographyCevap
  2. Serum B-type natriuretic peptide (BNP) levelCevap
  3. Thyroid-stimulating hormone (TSH) levelCevap
  4. D
    Right heart catheterization
  5. E
    Cardiac magnetic resonance imaging

Cevap

The correct diagnostic tests for the initial workup of this patient's suspected new-onset heart failure include transthoracic echocardiography, a serum B-type natriuretic peptide (BNP) level, and a thyroid-stimulating hormone (TSH) level.
The patient presents with classic signs and symptoms of new-onset heart failure, including paroxysmal nocturnal dyspnea, orthopnea, elevated jugular venous pressure, pulmonary crackles, pedal edema, and an S3 gallop. The appropriate initial diagnostic workup focuses on confirming the diagnosis, classifying the subtype (preserved vs. reduced ejection fraction), and identifying any reversible contributing factors using non-invasive methods. Transthoracic echocardiography is the most important initial imaging test to evaluate ventricular size, systolic/diastolic function, and valvular abnormalities. A serum B-type natriuretic peptide (BNP) or NT-proBNP level is highly sensitive and recommended to support the clinical diagnosis and provide prognostic information. Additionally, routine laboratory evaluation must include a thyroid-stimulating hormone (TSH) level, as both hyperthyroidism and hypothyroidism are common reversible causes that can precipitate or exacerbate heart failure.

Adım Adım Çözüm

1
Identify the most likely diagnosis based on the clinical presentation.
The patient's dyspnea on exertion, orthopnea, lower extremity edema, elevated jugular venous pressure, bibasilar crackles, and S3 gallop strongly suggest new-onset heart failure.
Recognizing the clinical syndrome of heart failure is the critical first step in guiding appropriate diagnostic testing and sequencing.
2
Determine the recommended initial imaging and biomarker testing to confirm the diagnosis.
Transthoracic echocardiography is required to assess cardiac structure and function, while natriuretic peptide (BNP or NT-proBNP) levels help establish the diagnosis and prognosis.
These are Class I guideline-recommended initial non-invasive tests for all patients presenting with suspected new-onset heart failure.
3
Identify necessary laboratory tests to evaluate for potential contributing or reversible causes.
A TSH level is required to evaluate for occult hyperthyroidism or hypothyroidism.
A comprehensive initial evaluation must include identifying common, treatable secondary causes before pursuing more advanced or invasive diagnostic modalities.

Anahtar Kavram

The initial diagnostic workup for new-onset heart failure includes confirming the diagnosis and assessing cardiac function with non-invasive tests (transthoracic echocardiography, natriuretic peptides) while simultaneously evaluating for reversible contributing causes (TSH, complete metabolic panel, complete blood count) prior to considering any advanced or invasive testing.
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Diagnostic Workup and Test Sequencing

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