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Mortality (a) and hospitalization due to heart failure exacerbation (b) over time. The Kaplan–Meier estimates of mortality and hospitalization for HF exacerbation over a median follow-up of 6 years are shown for high-risk patients with improvement in peak V̇O2, high-risk patients without improvement in peak V̇O2, and patients with a preserved V̇O2. Tick marks indicate censored data. HF, heart failure; V̇O2, peak exercise oxygen consumption.
