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Associations between kidney function and outcomes of comprehensive cardiac rehabilitation in patients with heart failure

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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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Corresponding author

Correspondence to Nobuaki Hamazaki.

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Conflict of interest

All authors report no conflict of interest related to this manuscript.

Ethical approval

This study protocol was approved by the Kitasato Institute Clinical Research Review Board (KMEO B18-075).

Informed consent

All patients provided informed consent.

Supplementary Information

Below is the link to the electronic supplementary material.

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)

Supplementary file2 (DOCX 32 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

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