Abstract
This study aimed to compare the independent and incremental prognostic value of peak oxygen consumption (VO2) and minute ventilation/carbon dioxide production (VE/VCO2) in heart failure (HF) with preserved (HFpEF), midrange (HFmEF), and reduced (HFrEF) ejection fraction (LVEF). In 195 HFpEF (LVEF ≥50%), 144 HFmEF (LVEF 40-49%), and 630 HFrEF (LVEF <40%) patients, we assessed the association of cardiopulmonary exercise testing variables with the composite outcome of death, left ventricular assist device implantation, or heart transplantation (256 events; median follow-up of 4.2 years), and 2-year incident HF hospitalization (244 events). In multivariable Cox regression analysis, greater association with outcomes in HFpEF than HFrEF were noted with peak VO2 (HR [95% confidence interval]: 0.76 [0.67-0.87] versus 0.87 [0.83-0.90] for the composite outcome, Pinteraction=0.052; 0.77 [0.69-0.86] versus 0.92 [0.88-0.95], respectively for HF hospitalization, Pinteraction=0.003) and VE/VCO2 slope (1.11 [1.06-1.17] versus 1.04 [1.03-1.06], respectively for the composite outcome, Pinteraction=0.012; 1.10 [1.05-1.15] versus 1.04 [1.03-1.06], respectively for HF hospitalization, Pinteraction=0.019). In HFmEF, peak VO2 and VE/VCO2 slope were ...Continue Reading
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