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Discovery and validation of serum creatinine variability as novel biomarker for predicting onset of albuminuria in Type 2 diabetes mellitus

Published:January 17, 2018DOI:https://doi.org/10.1016/j.diabres.2017.11.003

      Abstract

      Aim

      We aim to study association serum creatinine(cr) variability and albuminuria progression.

      Methods

      We conducted a retrospective cohort study on patients with Type 2 Diabetes Mellitus at a Diabetes Centre in Singapore (“discovery cohort”). Outcome is worsening of urinary albumin-to-creatinine(ACR) across stages. Cr variability was expressed as adjusted cr-intrapersonal standard deviation(SD) and coefficient-of-variation(cr-CV). A separate cohort was used for validating association between cr variability and albuminuria progression (“validation cohort”).

      Results

      Over median follow-up of 4.2 years, 38.4% of 636 patients had albuminuria progression in the discovery cohort. Increasing log-transformed adjusted cr-intrapersonal SD and cr-CV were significantly associated with albuminuria progression: HRs 1.43 (95%CI 1.11–1.85) and 1.44 (1.11–1.87) respectively in the discovery cohort, and HRs 1.94 (1.09–3.45) and 1.91 (1.05–3.45) respectively in the validation cohort. When stratified by baseline urinary ACR, higher cr variability was significantly associated with albuminuria progression in patients with normoalbuminuria but not microalbuminuria.

      Conclusions

      Cr variability independently predicts albuminuria onset. This is evident in patients with normoalbuminuria, suggesting that higher cr variability could herald albuminuria onset.

      Keywords

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