Prognostic value of submaximal exercise data for cardiac morbidity in fontan patients

Chun An Chen, Ssu Yuan Chen, Hsin Hui Chiu, Jou Kou Wang, Chung I. Chang, Ing Sh Chiu, Yih Sharng Chen, Chun Wei Lu, Ming Tai Lin, Hung Chi Lue, Yu Chuan Hua, Mei Hwan Wu

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Abstract

INTRODUCTION: Submaximal exercise parameters are associated with an increased risk of hospitalization in patients with heart failure, but the implication in patients with Fontan circulation remains unknown. We investigated the prognostic value of these parameters in a Fontan cohort, in whom maximal exercise effort is often limited. METHODS: Fifty-two Fontan patients received cardiopulmonary exercise tests at least 12 months after Fontan completion. We evaluated two maximal parameters (peak oxygen consumption (V̇O2) and HR reserve) and two submaximal parameters (oxygen uptake efficiency slope (OUES) and minute ventilation (V̇E) to carbon dioxide elimination (V̇CO2) slope). RESULTS: The peak V̇O2 and OUES were 58.0% ± 11.2% and 56.6% ± 14.5% of the age- and sex-related predicted values. In the subsequent follow-up (median, 22.7 months), 11 patients (21%, including one death) exhibited cardiac morbidity, defined as cardiac-related hospitalization. Time-dependent receiver operating characteristic curve analysis demonstrated that only submaximal parameters were related to 2-yr cardiac morbidity (area under the curve for OUES 0.781, P = 0.018; for V̇E/V̇CO2 slope 0.714, P = 0.04), even in the subgroup achieved maximal exercise effort. The optimal threshold value for OUES was 45%, and for the V̇E/V̇CO2 slope, it was 37. Furthermore, the OUES conveyed independent prognostic information beyond resting oxygen saturation and a history of heart failure or protein-losing enteropathy. CONCLUSION: Submaximal exercise parameters provide superior prognostic information to maximal exercise data for predicting cardiac morbidity in Fontan patients. Moreover, the association between the OUES and cardiac morbidity is independent of relevant baseline clinical information.

Original languageEnglish
Pages (from-to)10-15
Number of pages6
JournalMedicine and Science in Sports and Exercise
Volume46
Issue number1
DOIs
Publication statusPublished - Jan 2014
Externally publishedYes

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Keywords

  • Cardiopulmonary Exercise Test
  • Fontan Operation
  • Oxygen Uptake Efficiency Slope
  • Prognosis
  • V̇E/V̇CO Slope

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Chen, C. A., Chen, S. Y., Chiu, H. H., Wang, J. K., Chang, C. I., Chiu, I. S., Chen, Y. S., Lu, C. W., Lin, M. T., Lue, H. C., Hua, Y. C., & Wu, M. H. (2014). Prognostic value of submaximal exercise data for cardiac morbidity in fontan patients. Medicine and Science in Sports and Exercise, 46(1), 10-15. https://doi.org/10.1249/MSS.0b013e31829f8326