Key result
Pre-chemotherapy breast cancer is linked to ~26% lower peak VO2, driven by reduced peak cardiac index.
Why the study?
Women with early-stage breast cancer have reduced peak exercise oxygen uptake prior to adjuvant chemotherapy, but the determinants of exercise intolerance are not fully understood.
Case-Control (n=39)
Absolute Event Rate: 1.7% vs 2.3%
p-value: p=0.0013
Early-stage breast cancer patients exhibit reduced peak VO2 prior to chemotherapy, driven by decreased peak cardiac index and reduced biventricular end-diastolic volumes despite preserved ejection fraction.
May identify pre-chemotherapy fitness deficits in early breast cancer; hypothesis-generating for ventricular contributions to reduced peak VO2.
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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Beaudry et al. (2019) conducted a case-control in Early-stage breast cancer (n=39). Early-stage breast cancer prior to chemotherapy vs. Age-matched healthy women was evaluated on Peak exercise oxygen uptake (peak VO2) in L/min (p=0.0013). Early-stage breast cancer prior to chemotherapy was associated with significantly lower peak VO2 compared to healthy controls (1.7 vs. 2.3 L/min, P=0.0013) due to decreased peak cardiac index.
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