Diuretics in obstructive sleep apnea with diastolic heart failure

Area of Science:

• Cardiology
• Pulmonology
• Sleep Medicine

Background:

• Upper airway edema is a potential contributor to pharyngeal collapsibility and obstructive sleep apnea (OSA) in patients with heart disease.
• Diastolic heart failure is often associated with severe OSA and hypertension.

Purpose of the Study:

• To investigate if intensive unloading with diuretics can improve sleep-disordered breathing.
• To assess if diuretic treatment can increase pharyngeal caliber in patients with severe OSA and diastolic heart failure.

Main Methods:

• Fifteen patients with severe OSA, hypertension, and diastolic heart failure received 3 days of IV furosemide and oral spironolactone.
• Polysomnography measured the apnea-hypopnea index (AHI).
• Acoustic pharyngometry assessed oropharyngeal junction (OPJ) area, and airflow parameters (FIF(50), FEF(50)/FIF(50) percentage) were measured pre- and post-treatment.

Main Results:

• Diuretic treatment significantly reduced body weight, blood pressure (BP), and AHI (from 74.89 to 57.17/h).
• Improvements were observed in OPJ area (from 1.33 to 1.78 cm²), FIF(50) (from 3.16 to 3.94 L/s), and FEF(50)/FIF(50) percentage (from 117.9 to 93.15%).
• Weight loss correlated significantly with decreased AHI and improved airflow parameters.

Conclusions:

• Pharyngeal edema appears to contribute to sleep-disordered breathing in patients with severe OSA, hypertension, and diastolic heart failure.
• Reducing airway edema through diuretics may be a viable strategy for managing OSA in this patient population.
• These findings highlight the link between upper airway edema and the high prevalence of OSA in patients with heart disease.