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    Determinants of exercise intolerance in breast cancer patients prior to anthracycline chemotherapy

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    Author
    Beaudry, R; Howden, EJ; Foulkes, S; Bigaran, A; Claus, P; Haykowsky, MJ; La Gerche, A
    Date
    2019-01-01
    Source Title
    Physiological Reports
    Publisher
    WILEY
    University of Melbourne Author/s
    La Gerche, Andre; Howden, Erin
    Affiliation
    Medicine and Radiology
    Metadata
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    Document Type
    Journal Article
    Citations
    Beaudry, R., Howden, E. J., Foulkes, S., Bigaran, A., Claus, P., Haykowsky, M. J. & La Gerche, A. (2019). Determinants of exercise intolerance in breast cancer patients prior to anthracycline chemotherapy. PHYSIOLOGICAL REPORTS, 7 (1), https://doi.org/10.14814/phy2.13971.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/253563
    DOI
    10.14814/phy2.13971
    Abstract
    Women with early-stage breast cancer have reduced peak exercise oxygen uptake (peak VO2 ). The purpose of this study was to evaluate peak VO2 and right (RV) and left (LV) ventricular function prior to adjuvant chemotherapy. Twenty-nine early-stage breast cancer patients (mean age: 48 years) and 10 age-matched healthy women were studied. Participants performed an upright cycle exercise test with expired gas analysis to measure peak VO2 . RV and LV volumes and function were measured at rest, submaximal and peak supine cycle exercise using cardiac magnetic resonance imaging. Peak VO2 was significantly lower in breast cancer patients versus controls (1.7 ± 0.4 vs. 2.3 ± 0.5 L/min, P = 0.0013; 25 ± 6 vs. 35 ± 6 mL/kg/min, P = 0.00009). No significant difference was found between groups for peak upright exercise heart rate (174 ± 13 vs. 169 ± 16 bpm, P = 0.39). Rest, submaximal and peak exercise RV and LV end-diastolic and end-systolic volume index, stroke index, and cardiac index were significantly lower in breast cancer patients versus controls (P < 0.05 for all). No significant difference was found between groups for rest and exercise RV and LV ejection fraction. Despite preserved RV and LV ejection fraction, the decreased peak VO2 in early-stage breast cancer patients prior to adjuvant chemotherapy is due in part to decreased peak cardiac index secondary to reductions in RV and LV end-diastolic volumes.

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