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Difficulty: MediumCardiovascular System

A 64-year-old man comes to the primary care clinic for a routine evaluation of worsening shortness of breath and a dry, hacking cough over the past 3 months. He reports that the cough is particularly bothersome at night and often wakes him from sleep, forcing him to prop himself up with three pillows. His medical history is significant for hypertension, type 2 diabetes mellitus, and a 35-pack-year smoking history, though he quit smoking a decade ago. Current medications include lisinopril, amlodipine, and metformin. Vital signs show a temperature of 37.0°C (98.6°F), blood pressure of 158/92 mm Hg, pulse of 88/min, and respirations of 18/min. BMI is 29 kg/m². Pulse oximetry is 96% on room air. On physical examination, the lungs are clear to auscultation bilaterally. Cardiac examination reveals a regular rate and rhythm, but the point of maximal impulse is palpated at the anterior axillary line in the sixth intercostal space. A grade 2/6 holosystolic murmur is heard best at the cardiac apex. There is 1+ pitting edema in the bilateral ankles. Which of the following is the most appropriate next step in the diagnostic evaluation of this patient's condition?

  1. A
    Pulmonary function testing
  2. B
    Serum thyroid-stimulating hormone level
  3. Transthoracic echocardiographyAnswer
  4. D
    High-resolution computed tomography of the chest
  5. E
    Sputum gram stain and culture

Answer

Transthoracic echocardiography
The correct answer is transthoracic echocardiography. This patient's progressive dyspnea, orthopnea (waking at night, sleeping on multiple pillows), and peripheral edema are classic symptoms of volume overload and heart failure. More importantly, the physical examination reveals a laterally displaced point of maximal impulse (indicating left ventricular enlargement or dilation) and an apical holosystolic murmur (consistent with functional mitral regurgitation due to annular dilation). In a patient with suspected new-onset heart failure, transthoracic echocardiography is the most appropriate initial diagnostic test. It evaluates left and right ventricular systolic and diastolic function, wall thickness, chamber size, and valvular abnormalities. These parameters are necessary to confirm the diagnosis and classify the heart failure (e.g., preserved vs. reduced ejection fraction) to guide guideline-directed medical therapy.

Step-by-Step Solution

1
Identify the cardinal symptoms and physical exam findings in the clinical vignette.
The patient presents with orthopnea (coughing and dyspnea when supine), a displaced point of maximal impulse (PMI), an apical holosystolic murmur, and peripheral edema.
Synthesizing these clinical findings is crucial to differentiate between cardiac and pulmonary etiologies of chronic dyspnea and cough.
2
Formulate the most likely diagnosis based on the clinical presentation.
The findings strongly suggest chronic heart failure with reduced ejection fraction (HFrEF) leading to left ventricular dilation and secondary functional mitral regurgitation.
Recognizing the signs of ventricular remodeling and volume overload provides the rationale for selecting the correct diagnostic modality.
3
Select the most appropriate initial diagnostic test for suspected new-onset heart failure.
Transthoracic echocardiography is the gold standard initial non-invasive test.
It confirms the diagnosis by evaluating left ventricular ejection fraction, chamber dimensions, and valvular function, which will guide subsequent pharmacotherapy.

Key Concept

Clinical differentiation of chronic heart failure from pulmonary disease and the role of transthoracic echocardiography as the initial diagnostic test of choice for suspected new-onset heart failure.
Estimated Time:1m 30s
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Topics

Cardiovascular System

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