Who May Benefit From Diuretics in OSA?: A Propensity Score-Match Observational Study.

BACKGROUND

Diuretics have been reported as effective for reducing OSA severity by preventing fluid retention and reducing rostral fluid shift. The benefit of diuretics might vary depending on the OSA clinical phenotype and comorbidities. To test this hypothesis, we conducted a propensity score-matched cohort analysis of data from the French national sleep apnea registry "Observatoire Sommeil de la Fédération de Pneumologie."

RESEARCH QUESTION

Which phenotypic subtypes of OSA may benefit from diuretics?

STUDY DESIGN AND METHODS

A propensity score analysis was used to determine the impact of diuretics on OSA severity. Matching (ratio 1:4) was performed by using a 0.1 collider for the propensity score. Severe OSA was defined as an apnea-hypopnea index (AHI) > 30 events/h, and the usefulness of diuretics was assessed by using a logistic regression model.

RESULTS

The 69,564 OSA patients studied in the OSFP prospective observational cohort had a median age of 56.9 years (interquartile range: 47.4; 65.6), 67% were men, and the median AHI was 28 (14; 43) events/h. Among them, 9,783 (14.1%) were treated with diuretics. Diuretics reduced OSA severity in overweight or moderately obese patients (P = .03) and in patients with hypertension (P < .01), particularly in patients with hypertension with a BMI between 25 and 35 (P < .01). Diuretics had no significant effect on OSA severity in patients with self-reported low physical activity or heart failure.

INTERPRETATION

Diuretics appear to have a positive impact on OSA severity in overweight or moderately obese patients with hypertension. A prospective study is needed to confirm that diuretics are of interest in combined therapies for hypertensive patients with OSA.