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Question

Difficulty: MediumSleep-Wake Disorders

A 58-year-old man presents to the clinic for evaluation of progressive fatigue and poor concentration over the past 6 months. He states that he sleeps 8 hours each night but frequently awakens feeling unrefreshed and with a diffuse morning headache. His wife reports that he snores loudly and occasionally appears to stop breathing for short periods, often waking up with a sudden gasp. He consumes 2 to 3 alcoholic beverages nightly. His medical history includes type 2 diabetes mellitus and hypertension. Current medications are metformin and lisinopril. BMI is 34 kg/m234 \text{ kg/m}^2. Blood pressure is 152/94 mmHg152/94 \text{ mmHg}, pulse is 78/min78 \text{/min}, and respirations are 14/min14 \text{/min}. Cardiopulmonary examination reveals clear lungs bilaterally, regular heart rhythm without murmurs, and no jugular venous distention. Laboratory studies show a normal serum thyroid-stimulating hormone concentration. Which of the following is the most appropriate next step in management?

  1. Perform overnight polysomnographyAnswer
  2. B
    Obtain a transthoracic echocardiogram
  3. C
    Measure serum free thyroxine concentration
  4. D
    Prescribe a trial of citalopram
  5. E
    Schedule for uvulopalatopharyngoplasty

Answer

The correct answer is to perform overnight polysomnography.
This patient presents with a classic clinical picture of Obstructive Sleep Apnea (OSA), characterized by daytime fatigue, unrefreshing sleep, diffuse morning headaches, loud snoring, and witnessed apneic episodes terminating in gasps. His risk factors include obesity (BMI > 30), male sex, advancing age, and evening alcohol use, which relaxes upper airway musculature. The most appropriate next step in management for a patient with high clinical suspicion for OSA is an overnight polysomnography (sleep study). This test definitively diagnoses OSA by measuring the Apnea-Hypopnea Index (AHI) and guides subsequent treatment, such as continuous positive airway pressure (CPAP) therapy or lifestyle modifications.

Step-by-Step Solution

1
Analyze the patient's clinical presentation.
Identify classic symptoms of Obstructive Sleep Apnea (OSA), including obesity, loud snoring, witnessed apneas, morning headaches, and unrefreshing sleep.
Recognizing the constellation of symptoms is essential to form the correct primary differential diagnosis.
2
Differentiate the symptoms from other etiologies.
Rule out heart failure (normal cardiopulmonary exam), hypothyroidism (normal TSH), and primary depression (airway symptoms are dominant).
Fatigue and sleep disturbances have a broad differential that must be narrowed using physical exam and basic laboratory findings.
3
Determine the initial diagnostic standard for the suspected condition.
Select polysomnography to formally diagnose and quantify the severity of the suspected OSA.
A sleep study is required to calculate the Apnea-Hypopnea Index (AHI) before initiating treatments like CPAP.

Key Concept

Diagnosis of Obstructive Sleep Apnea requires polysomnography to confirm the presence and severity of apneic episodes.
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Topics

Sleep-Wake Disorders

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