Abstract
Background
Evaluating patients’ risk for acute kidney injury (AKI) is crucial for positive outcomes following cardiac surgery. Our aims were first to select candidate risk factors from pre- or intra-operative real-world parameters collected from routine medical care and then evaluate potential associations between those parameters and risk of onset of post-operative cardiac surgery-associated AKI (CSA-AKI).
Method
We conducted two cohort studies in Japan. The first was a single-center prospective cohort study (n = 145) to assess potential association between 115 clinical parameters collected from routine medical care and CSA-AKI (≥ Stage1) risk in the population of patients undergoing cardiac surgery involving cardiopulmonary bypass (CPB). To select candidate risk factors, we employed random forest analysis and applied survival analyses to evaluate association strength. In a second retrospective cohort study, we targeted patients undergoing cardiac surgery with CPB (n = 619) and evaluated potential positive associations between CSA-AKI incidence and risk factors suggested by the first cohort study.
Results
Variable selection analysis revealed that parameters in clinical categories such as circulating inflammatory cells, CPB-related parameters, ventilation, or aging were potential CSA-AKI risk factors. Survival analyses revealed that increased counts of pre-operative circulating monocytes and neutrophils were associated with CSA-AKI incidence. Finally, in the second cohort study, we found that increased pre-operative circulating monocyte counts were associated with increased CSA-AKI incidence.
Conclusions
Circulating monocyte counts in the pre-operative state are associated with increased risk of CSA-AKI development. This finding may be useful in stratifying patients for risk of developing CSA-AKI in routine clinical practice.
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Data availability
The Ethics Committee for Clinical Research at Kumamoto University has placed restrictions on public data sharing because data contain sensitive information.
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Acknowledgements
The authors thank Ms. Kiyoka Tabu and Ms. Kazumi Saito for technical assistance. The authors also thank Kenta Uekihara, M.D., Michiaki Sadanaga, M.D., Michiko Nagamine, M.D., and Masakazu Hamaguchi, CE., on the staff of Japanese Red Cross Kumamoto Hospital, for supporting data collection.
Funding
This study was supported by the Project for Elucidating and Controlling Mechanisms of Aging and Longevity of the Japan Agency for Medical Research and Development (AMED) for Yuichi Oike (Grant: JP19gm5010002), and the Japanese Association of Dialysis Physicians for Jun Morinaga (Grant: 2021-12).
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YO, JM, and YO conceived the idea of the study. YO, JM, and YY conducted data management and statistical analyses. YO, JM, YY, MH, TS, RH, TI, RS, KU, TF and TY contributed to the data collection. YO, JM, EM, HF, TK, HH, MS, TS, MH, MM, and YO contributed to the interpretation of the results. YO, JM, and YO drafted the original manuscript. TK, RS, TF and MM supervised the conduct of this study. All authors reviewed the manuscript draft and revised it critically on intellectual content. All authors approved the final version of the manuscript to be published.
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Okadome, Y., Morinaga, J., Yamanouchi, Y. et al. Increased numbers of pre-operative circulating monocytes predict risk of developing cardiac surgery-associated acute kidney injury in conditions requiring cardio pulmonary bypass. Clin Exp Nephrol 27, 329–339 (2023). https://doi.org/10.1007/s10157-022-02313-x
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DOI: https://doi.org/10.1007/s10157-022-02313-x