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Decrease in Cerebral Oxygen Saturation During the 6-Minute Walk Test in Pediatric Pulmonary Arterial Hypertension

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Abstract

This observational study aimed to investigate the relationship between regional cerebral oxygen saturation (rSO2) during the 6-minute walk test (6-MWT) and the demographic/clinical features of patients with pulmonary arterial hypertension (PAH). Cerebral oxygenation was evaluated during the 6-MWT in 20 pediatric patients with PAH aged ≥ 7 years [13 male, 7 female; median age 12.25 (range 7–18) years]. In all patients, regional cerebral oxygen saturation    (rSO2), arterial oxygen saturation (SpO2), and heart rate (HR) were measured using near-infrared spectroscopy (NIRS) for 2 min before the test, during the 6-MWT test, and 2 min after the test. The relationship between the changes in rSO2, heart rate, and SpO2 values and clinical and laboratory features was compared statistically. The mean pulmonary arterial pressure (mPAP) was 77 (range 25–126) mmHg, and the median 6-minute walk distance (6-MWD) was 427.5 (300–570) m. The changes in rSO2 measurements ranged between 3.41 and 21.8%, and 70% of the patients had a greater than 10% decrease in rSO2 during the test compared with baseline. Eight patients showed a decrease in rSO2 without SpO2 changes. The present study demonstrated a significant decrease in cerebral oxygenation in pediatric patients with PAH during the 6-MWT. We hypothesized that using a combination of the 6-MWT and regional cerebral oxygenation monitoring in pediatric patients with PAH in order to evaluate exercise capacity, as a reflection of reduced daily activities, would provide more precise predictive values than the 6-MWT alone.

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Authors

Contributions

TO: conceptualized and designed the study, performed data collection, drafted the manuscript and constructed the tables and the figures for the manuscript. ZO and HC: conceptualized and designed the study, designed the data collection instruments, performed data collection, performed analysis, and drafted the initial manuscript. DY: performed data collection, performed analysis and constructed the tables and the figures for the manuscript. KG: conceptualized and designed the study, performed data collection, critically revised the article, and approved article. SK: supervised data collection, drafted the initial manuscript, and constructed the tables and the figures for the manuscript. All authors approved the final manuscript as submitted and agree to be accountable for all aspects of the work.

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Correspondence to Leman Tekin Orgun.

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The authors have no conflicts of interest to disclose.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all patients included in the study and their parents or guardians.

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Orgun, L.T., Öztürk, Z., Canbeyli, F.H. et al. Decrease in Cerebral Oxygen Saturation During the 6-Minute Walk Test in Pediatric Pulmonary Arterial Hypertension. Pediatr Cardiol 40, 1494–1502 (2019). https://doi.org/10.1007/s00246-019-02174-4

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