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. 2022 Aug;200(4):523-530.
doi: 10.1007/s00408-022-00547-w. Epub 2022 Jun 18.

Sleep-Disordered Breathing in Adults with Precapillary Pulmonary Hypertension: Prevalence and Predictors of Nocturnal Hypoxemia

Marcia S Murta  1 , Ricardo L M Duarte  2 , Daniel Waetge  1 , David Gozal  3 , Alexandre P Cardoso  1 , Fernanda C Q Mello  1
Affiliations

Sleep-Disordered Breathing in Adults with Precapillary Pulmonary Hypertension: Prevalence and Predictors of Nocturnal Hypoxemia

Marcia S Murta et al. Lung. 2022 Aug.

Abstract

Purpose: To evaluate the frequency of sleep-disordered breathing (SDB) and predictors of the presence of nocturnal desaturation in adults with pulmonary arterial hypertension and chronic thromboembolic pulmonary hypertension.

Methods: Outpatients with a hemodynamic diagnosis of precapillary pulmonary hypertension who underwent portable polysomnography were evaluated. Diagnosis and severity of SDB were assessed using three well-established respiratory disturbance index (RDI) thresholds: 5.0/h, 15.0/h, and 30.0/h, while nocturnal hypoxemia was defined by the average oxygen saturation (SpO2) < 90%. Multiple linear regression analysis evaluated the potential relationships among explanatory variables with the dependent variable (average SpO2 values), with comparisons based on the standardized regression coefficient (β). The R-squared (R2; coefficient of determination) was used to evaluate the goodness-of-fit measure for the linear regression model.

Results: Thirty-six adults were evaluated (69.4% females). The majority of the participants (75.0%) had SDB (26 with obstructive sleep apnea [OSA] and one with central sleep apnea [CSA]); while 50% of them had nocturnal hypoxemia. In the linear regression model (R2 = 0.391), the mean pulmonary artery pressure [mPAP] (β - 0.668; p = 0.030) emerged as the only independent parameter of the average SpO2.

Conclusion: Our study found that the majority of the participants had some type of SDB with a marked predominance of OSA over CSA, while half of them had nocturnal desaturation. Neither clinical and hemodynamic parameters nor the RDI was a predictor of nocturnal desaturation, except for mPAP measured during a right heart catheterization, which emerged as the only independent and significant predictor of average SpO2.

Keywords: Nocturnal hypoxemia; Polysomnography; Pulmonary hypertension; Sleep-disordered breathing.

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