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Kidney Week

Abstract: PO0251

Prediction of the Clinical Outcomes in Patients with CRRT Using Body Composition Monitoring: A Machine Learning Approach to a Multicenter Cohort Study

Session Information

Category: Acute Kidney Injury

  • 102 AKI: Clinical, Outcomes, and Trials


  • Yoo, Kyung Don, Ulsan University Hospital, Ulsan, Korea (the Republic of)
  • Noh, Junhyug, Lawrence Livermore National Laboratory, Livermore, California, United States
  • An, Jung Nam, Hallym University Sacred Heart Hospital, Anyang, Gyeonggi-do, Korea (the Republic of)
  • Baek, Seon Ha, Hallym University Dongtan Sacred Heart Hospital, Hwaseong, Gyeonggi, Korea (the Republic of)
  • Ahn, Shin-Young, Korea University Guro Hospital, Seoul, Korea (the Republic of)
  • Rhee, Harin, Pusan National University Hospital, Busan, Korea (the Republic of)
  • Seong, Eun Young, Pusan National University Hospital, Busan, Korea (the Republic of)
  • Cho, Jang-Hee, Kyungpook National University, Daegu, Daegu, Korea (the Republic of)
  • Kim, Dong Ki, Seoul National University Hospital, Jongno-gu, Korea (the Republic of)
  • Kim, Sejoong, Seoul National University Bundang Hospital, Seongnam, Korea (the Republic of)
  • Lee, Jung Pyo, Seoul National University Seoul Metropolitan Government Boramae Medical Center, Dongjak-gu, Korea (the Republic of)

Fluid balance is a critical predictor of patient outcomes with severe acute kidney injury (AKI) requiring continuous renal replacement therapy (CRRT). However, accurate assessment and application of fluid balance monitoring for predicting clinical outcomes in these patients were inconclusive.


In a multicenter cohort study, a total of 784 patients with severe AKI requiring CRRT were recruited, and body composition monitoring (BCM) using InBody® was performed on patients who started CRRT at nine tertiary hospitals in Korea from 2017 Nov to 2019 Nov. The comparison for sequential changes of total body water was performed between the survivor and non-survivor groups using mixed-effects linear regression analysis. Machine learning algorithms were used for the modeling to predict mortality.


Of the 784 patients (mean age: 63.5 years), 521 (66.4%) were male. The mean APACHE II score was 29.2 ± 10.3 in the non-survivor group and 26.5 ± 9.0 in the survivor group. There were no significant differences in the volume status assessed by body weight and BCM at baseline. After adjusting for confounding factors, the survivor group had a marginal benefit from fluid balance in a mixed-effects linear regression (p=0.074). From a range attribute of the decision tree model for predicted mortality, platelet count was found in the first node in the late mortality group (survival duration > 60 days). Patients with survival duration under 60 days showed increased mortality, according to the SOFA score, serum sodium, bilirubin, and target clearance in a decision tree model (AUC=0.957)(Figure 1).


These machine learning approaches showed that conventional parameters for predicting clinical outcomes were interrelated as notable risk factors for mortality augmented by BCM in CRRT patients.

Figure 1. The classification of mortality event using decision tree modeling