Key result
Clinical and physical activity predictors could not accurately classify achieving peak exercise criteria (AUPRC 0.55), explaining only 21.4% of the variance in respiratory exchange ratio.
Why the study?
Many patients with Fontan physiology cannot achieve minimum criteria for peak effort during cardiopulmonary exercise testing, and the influence of physical activity and other clinical predictors on achieving peak exercise criteria remains to be determined.
Cross-Sectional (n=43)
Standard demographic, physical activity, and cardiopulmonary exercise test measures poorly predict the ability of youth with Fontan physiology to achieve peak exercise criteria (RER ≥ 1.1).
Answers are grounded in this paper and cite their sources.
Caution interpreting CPET with standard criteria in Fontan youth; leaves open validation of alternative peak thresholds.
OBJECTIVES: Many patients with Fontan physiology are unable to achieve the minimum criteria for peak effort during cardiopulmonary exercise testing. The purpose of this study is to determine the influence of physical activity and other clinical predictors related to achieving peak exercise criteria, signified by respiratory exchange ratio ≥ 1.1 in youth with Fontan physiology. METHODS: Secondary analysis of a cross-sectional study of 8-18-year-olds with single ventricle post-Fontan palliation who underwent cardiopulmonary exercise testing (James cycle protocol) and completed a past-year physical activity survey. Bivariate associations were assessed by Wilcoxon rank-sum test and simple regression. Conditional inference forest algorithm was used to classify participants achieving respiratory exchange ratio > 1.1 and to predict peak respiratory exchange ratio. RESULTS: Of the n = 43 participants, 65% were male, mean age was 14.0 ± 2.4 years, and 67.4% (n = 29) achieved respiratory exchange ratio ≥ 1.1. Despite some cardiopulmonary exercise stress test variables achieving statistical significance in bivariate associations with participants achieving respiratory exchange ratio > 1.1, the classification accuracy had area under the precision recall curve of 0.55. All variables together explained 21.4% of the variance in respiratory exchange ratio, with peak oxygen pulse being the most informative. CONCLUSION: Demographic, physical activity, and cardiopulmonary exercise test measures could not classify meeting peak exercise criteria (respiratory exchange ratio ≥ 1.1) at a satisfactory accuracy. Correlations between respiratory exchange ratio and oxygen pulse suggest the augmentation of stroke volume with exercise may affect the Fontan patient's ability to sustain high-intensity exercise.
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Carey et al. (2023) conducted a cross-sectional in Fontan physiology (n=43). Demographic, physical activity, and cardiopulmonary exercise test measures was evaluated on Achieving peak exercise criteria (respiratory exchange ratio ≥ 1.1). Clinical and physical activity predictors could not accurately classify achieving peak exercise criteria (AUPRC 0.55), explaining only 21.4% of the variance in respiratory exchange ratio.
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