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Difficulty: MediumDiagnostic Workup and Test Sequencing

A 58-year-old man presents to the primary care clinic reporting a four-week history of progressively worsening shortness of breath, particularly when climbing stairs. He also notes waking up gasping for air at night and increased swelling in his ankles. He has a history of type 2 diabetes mellitus and hypertension. His current medications include metformin and lisinopril. Vital signs show a blood pressure of 145/90 mm Hg, heart rate of 92/min, and respiratory rate of 18/min. Physical examination reveals elevated jugular venous pressure, a regular rhythm with an S3 gallop, bibasilar lung crackles, and 2+ bilateral pitting edema to the mid-calves. The physician suspects new-onset heart failure. Which of the following diagnostic tests should be ordered concurrently as part of the initial baseline evaluation for this patient? (Select all that apply)

  1. Transthoracic echocardiographyAnswer
  2. 12-lead electrocardiogramAnswer
  3. Serum thyroid-stimulating hormone levelAnswer
  4. D
    Coronary angiography
  5. E
    Cardiac magnetic resonance imaging

Answer

The initial baseline evaluation for new-onset heart failure should concurrently include transthoracic echocardiography, a 12-lead electrocardiogram, and a serum thyroid-stimulating hormone level.
The patient presents with classic signs and symptoms of new-onset decompensated heart failure. According to clinical guidelines, the initial diagnostic sequence must establish the diagnosis, assess cardiac structure and function, and identify potential precipitating or reversible causes. A 12-lead electrocardiogram is essential to evaluate for arrhythmias, conduction delays, or evidence of prior myocardial infarction. Transthoracic echocardiography is the primary non-invasive imaging modality required to determine the left ventricular ejection fraction, assess valvular function, and categorize the heart failure type. Additionally, checking a serum thyroid-stimulating hormone level is routinely indicated because both hyperthyroidism and hypothyroidism can precipitate or exacerbate heart failure, representing a critical reversible etiology.

Step-by-Step Solution

1
Identify the primary clinical syndrome.
The patient's symptoms (dyspnea on exertion, orthopnea) and signs (JVP, S3 gallop, crackles, edema) strongly indicate new-onset decompensated heart failure.
Recognizing the syndrome dictates the guideline-directed initial diagnostic workup.
2
Determine the necessary baseline non-invasive cardiac tests.
Select a 12-lead electrocardiogram to check electrical activity and transthoracic echocardiography to assess structural function and ejection fraction.
These are the gold standard preliminary tests required to phenotype the heart failure (reduced vs. preserved ejection fraction) and guide therapy.
3
Identify required concurrent baseline laboratory studies.
Select serum thyroid-stimulating hormone (TSH) level alongside standard blood work (CBC, CMP, BNP).
Thyroid dysfunction is a classic, potentially reversible cause or exacerbator of heart failure that must be ruled out initially.
4
Exclude premature or advanced diagnostic tests.
Rule out coronary angiography and cardiac magnetic resonance imaging.
These tests are indicated only after initial non-invasive workup raises specific suspicions (e.g., severe ischemia, infiltrative cardiomyopathy) or if initial testing is equivocal.

Key Concept

The initial diagnostic workup for new-onset heart failure includes concurrent functional assessment (ECG), structural imaging (echocardiography), and screening for reversible systemic causes (TSH).
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Diagnostic Workup and Test Sequencing

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