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

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posted on 2019-01-01, 00:00 authored by Rhys I Beaudry, Erin J Howden, Steve Foulkes, Ashley Bigaran, Piet Claus, Mark J Haykowsky, Andre La Gerche
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.

History

Journal

Physiological reports

Volume

7

Issue

1

Article number

e13971

Publisher

Wiley

Location

Chichester, Eng.

ISSN

2051-817X

eISSN

2051-817X

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2019, The Authors