%0 Journal Article %A Alexandra N. Linder %A Jill Hsia %A Sheila V. Krishnan %A Erika B. Rosenzweig %A Usha S. Krishnan %T Vasoreactive phenotype in children with pulmonary arterial hypertension and syncope %D 2022 %R 10.1183/23120541.00223-2022 %J ERJ Open Research %P 00223-2022 %X Background Syncope in Group 1 pulmonary arterial hypertension (PAH) is an independent predictor of poor prognosis in adults but this is not well studied in children. We hypothesize that syncope in children with PAH often occurs in association with a reactive pulmonary vascular bed with sudden vasoconstriction in response to adverse stimuli. In the current study, we sought to determine the association of syncope with acute vasoresponsiveness and outcomes in children with Group 1 PAH.Methods A retrospective chart review of children with PAH at a single Pulmonary Hypertension Centre from 1/1/2005–10/1/2018 was performed. Data included demographics, symptoms, imaging, haemodynamics, and outcomes at baseline and follow-up.Results 169 children had Group 1 PAH; 47(28%) had syncope at presentation or follow-up. Children with significant shunts were excluded from the analysis. Children with syncope were older at diagnosis(7.5 versus 5.0 years; p=0.002) and had a higher incidence of chest pain(p=0.022) and fatigue(p=0.003). They had higher pulmonary vascular resistance at baseline(14.9 versus 9.1 Wu*m2;p=0.01). More children with syncope were vasoresponders to inhaled nitric oxide(33% versus 22%; p=0.08-NS). Children with syncope and acute vasoresponsiveness had the highest survival and non-responders with syncope on medications had the worst long-term survival.Conclusions Children with syncope had higher rates of vasoreactivity compared to those without. This suggests that in some children with PAH, syncope may simply reflect acute pulmonary vasoconstriction to an adverse stimulus. Larger prospective studies are warranted to further assess syncope as a marker for a vasoreactive phenotype with implications for treatment and long-term outcomes.FootnotesThis manuscript has recently been accepted for publication in the ERJ Open Research. It is published here in its accepted form prior to copyediting and typesetting by our production team. After these production processes are complete and the authors have approved the resulting proofs, the article will move to the latest issue of the ERJOR online. Please open or download the PDF to view this article.Conflicts of interest: No conflicts of interest exist for the following authors: ANL, JH, and SVK %U https://openres.ersjournals.com/content/erjor/early/2022/06/30/23120541.00223-2022.full.pdf