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  • Title: Correlation between cardio-pulmonary exercise test variables and health-related quality of life among children with congenital heart diseases.
    Author: Amedro P, Picot MC, Moniotte S, Dorka R, Bertet H, Guillaumont S, Barrea C, Vincenti M, De La Villeon G, Bredy C, Soulatges C, Voisin M, Matecki S, Auquier P.
    Journal: Int J Cardiol; 2016 Jan 15; 203():1052-60. PubMed ID: 26638054.
    Abstract:
    BACKGROUND: Health-related quality of life (HR-QoL) stands as a determinant "patient-related outcome" and correlates with cardio-pulmonary exercise test (CPET) in adults with chronic heart failure or with a congenital heart disease (CHD). No such correlation has been established in pediatric cardiology. METHODS AND RESULTS: 202 CHD children aged 8 to 18 performed a CPET (treadmill n=96, cycle-ergometer n=106). CHD severity was stratified into 4 groups. All children and parents filled out the Kidscreen HR-QoL questionnaire. Peak VO2, anaerobic threshold (AT), and oxygen pulse followed a downward significant trend with increasing CHD severity and conversely for VE/VCO2 slope. Self-reported and parent-reported physical well-being HR-QoL scores correlated with peak VO2 (respectively r=0.27, p<0.0001 and r=0.43, p<0.0001), percentage of predicted peak VO2 (r=0.28, p=0.0001 and r=0.41, p<0.0001), and percentage of predicted VO2 at AT (r=0.22, p<0.01 and r=0.31, p<0.0001). Significant correlations were also observed between several HR-QoL dimensions and dead space to tidal volume ratio (VD/VT), oxygen uptake efficiency slope (OUES), oxygen pulse but never with VE/VCO2 slope. The strongest correlations were observed in the treadmill group, especially between peak VO2 and physical well-being for parents (r=0.57, p<0.0001) and self (r=0.40, p<0.0001) reported HR-QoL. CONCLUSIONS: Peak VO2 and AT are the two CPET variables that best correlated with HR-QoL in this large pediatric cohort, parents' reports being more accurate. If HR-QoL is involved as a "PRO" in a pediatric cardiology clinical trial, we suggest using parents related physical well-being HR-QoL scores. CLINICAL TRIAL REGISTRATION: ClinicalTrials.gov (number NCT01202916).
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