Prevalence of elevated right ventricular pressure in children with obstructive sleep apnea syndrome undergoing pulmonary hypertension screening

Study Objectives: Our objective was to determine the prevalence of elevated right ventricular pressure (RVP) as a surrogate marker for pulmonary hypertension in children with obstructive sleep apnea syndrome (OSAS) undergoing echocardiography. Methods: This was a retrospective chart review of children ages 2-21 years diagnosed with OSAS by an overnight polysomnogram who underwent cardiac echocardiogram to screen for pulmonary hypertension within 6 months of polysomnogram in a tertiary inner-city pediatric hospital. The primary outcome was elevated RVP defined by estimated RVP >= 25 mm Hg above right atrial pressure or ventricular septal configuration consistent with elevated RVP. Results: A total of 174 children were included. The median (interquartile range) age was 8.9 (5.5-13.1) years with 59.2% male, 41.4% Hispanic, and 25.9% non-Hispanic Black patients. The prevalence of obesity was 72.0% and severe or very severe OSAS was present in 93.1%. The median (interquartile range) apnea-hypopnea index was 28.3 events/h (18.8-52.7 events/h). Seven children (4.0%) had elevated RVP. There was no association between elevated RVP and age, sex, race, body mass index percentile, apnea-hypopnea index, oxygen nadir, or severe OSAS (apnea-hypopnea index >= 10 events/h). Conclusions: Elevated RVP was rare and was not associated with OSAS severity. The prevalence in this cohort is higher than the prevalence of pulmonary hypertension noted in similar studies (0%-1.8%), which may be related to differences in methodology or unassessed cohort characteristics. Further effort to determine the optimal role for pulmonary hypertension screening in pediatric OSAS is needed.