Abstract
Aims
To investigate the impact of baseline kidney function on outcomes following comprehensive cardiac rehabilitation (CR) in patients with heart failure (HF).
Methods
We reviewed a total of 3,727 patients who were admitted for HF treatment. Estimated glomerular filtration rate (eGFR), quadriceps strength (QS), and 6-min walk distance (6MWD) were measured at hospital discharge as a baseline and 5 months thereafter in participants of outpatient comprehensive CR. The association between outpatient CR participation and all-cause events was evaluated using propensity score-matched analysis in subgroups across eGFR stages. The changes in QS and 6MWD following 5-month CR were compared between eGFR stages.
Results
Out of the studied patients, 1585 (42.5%) participated in outpatient CR. After propensity matching for clinical confounders, 2680 patients were included for analysis (pairs of n = 1340 outpatient CR participants and nonparticipants). The participation in outpatient CR was significantly associated with low clinical events in subgroups of eGFR ≥ 60 [hazard ratio (HR): 0.65, 95% confidence interval (CI): 0.51–0.84] and eGFR 45–60 (HR: 0.71, 95% CI: 0.55–0.92), but not in eGFR 30–45 (HR: 0.83, 95% CI: 0.64–1.08) and eGFR < 30 (HR: 0.88, 95% CI: 0.69–1.12). QS and 6MWD were significantly higher after 5-month CR than those at baseline (P < 0.001, respectively), but lower baseline eGFR correlated with lower changes in QS and 6MWD (trend P < 0.001, respectively).
Conclusions
Although low baseline kidney function attenuates the outcomes of CR, outpatient CR seems to be associated with a better prognosis and positive change in physical function in HF patients with low kidney function.
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Funding
This work was supported by Japan Society for the Promotion of Science Grant-in-Aid (JSPS KAKENHI Grant Number JP19K1922).
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All authors report no conflict of interest related to this manuscript.
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This study protocol was approved by the Kitasato Institute Clinical Research Review Board (KMEO B18-075).
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All patients provided informed consent.
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392_2021_1875_MOESM1_ESM.docx
Comparisons between clinical variables before and after the 5-month CR. Orange bars indicate baseline; green bars indicate after 5-month CR. Data, mean and standard error. BMI body mass index, BNP brain natriuretic peptide, CR cardiac rehabilitation, eGFR estimated glomerular filtration rate, QS quadriceps strength, 6MWD 6-min walk distance (TIF 981 kb)
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Hamazaki, N., Kamiya, K., Yamamoto, S. et al. Associations between kidney function and outcomes of comprehensive cardiac rehabilitation in patients with heart failure. Clin Res Cardiol 111, 253–263 (2022). https://doi.org/10.1007/s00392-021-01875-2
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DOI: https://doi.org/10.1007/s00392-021-01875-2