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Zorluk: ZorSleep-Wake Disorders

A 68-year-old retired mechanic is brought to the clinic by his wife due to excessive daytime sleepiness and frequent nighttime awakenings over the past two months. His wife reports that he sleeps restlessly and has episodes where he completely stops breathing for about 20 seconds at a time. The patient has a history of a myocardial infarction four years ago, type 2 diabetes mellitus, and hypertension. His current medications include metformin, low-dose aspirin, and amlodipine. Vital signs are temperature 37.0°C (98.6°F), blood pressure 118/76 mmHg, heart rate 92/min, and respiratory rate 18/min. BMI is 26 kg/m226 \text{ kg/m}^2. Physical examination reveals a laterally displaced point of maximal impulse, a faint third heart sound (S3), and trace bilateral lower extremity pitting edema. A polysomnography study demonstrates recurrent episodes of apnea without associated chest or abdominal wall movement, occurring between periods of a crescendo-decrescendo breathing pattern. Which of the following is the most appropriate initial step in the management of this patient's sleep disorder?

  1. A
    Initiate continuous positive airway pressure therapy
  2. B
    Prescribe modafinil to address excessive daytime sleepiness
  3. C
    Assess serum thyroid-stimulating hormone and free T4 levels
  4. D
    Perform an arterial blood gas analysis to evaluate acid-base status
  5. Initiate furosemide and lisinopril therapyCevap

Cevap

Initiate furosemide and lisinopril therapy
The correct answer identifies the need to treat the underlying cause of the patient's sleep disorder. The patient's polysomnography demonstrates central sleep apnea (apnea without respiratory effort) characterized by a crescendo-decrescendo tidal volume pattern. This is the hallmark of Cheyne-Stokes respiration, a condition driven by delayed circulation times and abnormal feedback loops in the respiratory control center, most commonly due to congestive heart failure. The physical exam confirms fluid overload and left ventricular dilation (displaced apical impulse, S3). For central sleep apnea caused by heart failure, the primary and initial intervention is to aggressively optimize the medical regimen for heart failure (e.g., initiating a loop diuretic like furosemide and an ACE inhibitor like lisinopril).

Adım Adım Çözüm

1
Interpret the polysomnography findings.
The study shows apneic episodes without chest or abdominal wall movement (lack of respiratory effort) interspersed with a crescendo-decrescendo breathing pattern.
This specific pattern defines Cheyne-Stokes respiration and central sleep apnea, differentiating it from obstructive sleep apnea where respiratory effort is maintained.
2
Correlate the sleep study pattern with the physical examination.
The patient has a laterally displaced point of maximal impulse, an S3 gallop, and peripheral edema.
These findings indicate decompensated congestive heart failure, which is the classic underlying cause of Cheyne-Stokes respiration.
3
Determine the most appropriate initial management.
The first-line intervention is to optimize the medical management of heart failure (e.g., using diuretics, ACE inhibitors, and beta-blockers).
Treating the underlying hemodynamic derangement in congestive heart failure often improves or resolves the associated central sleep apnea before specific airway interventions are required.

Anahtar Kavram

Central sleep apnea with Cheyne-Stokes respiration is heavily associated with advanced heart failure. The initial treatment is optimization of guideline-directed medical therapy for heart failure.
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Sleep-Wake Disorders

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