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J Diabetes Investig. 2021 Nov;12(11):2028-2035. doi: 10.1111/jdi.13568. Epub 2021 May 20.

Bilirubin is inversely related to diabetic peripheral neuropathy assessed by sural nerve conduction study.

Journal of diabetes investigation

Kentaro Abe, Yasutaka Maeda, Chitose Matsuzaki, Hisashi Yokomizo, Tomoaki Inoue, Noriyuki Sonoda, Yoshihiro Ogawa, Toyoshi Inoguchi

Affiliations

  1. Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
  2. Department of Diabetes, Endocrinology and Metabolism, National Hospital Organization Kokura Medical Center, Kitakyusyu, Japan.
  3. Minami Diabetes Clinical Research Center, Fukuoka, Japan.
  4. Department of Endocrine, Metabolism and Diabetes, Kyushu University Hospital, Fukuoka, Japan.
  5. Fukuoka City Health Promotion Support Center, Fukuoka, Japan.

PMID: 33949141 PMCID: PMC8565409 DOI: 10.1111/jdi.13568

Abstract

AIMS/INTRODUCTION: Diagnosis of diabetic peripheral neuropathy (DPN) depends on subjective findings, certain investigations for DPN risks have not been performed enough. Bilirubin protects against vascular complications by reducing oxidative stress in diabetes, but is not fully tested for DPN. This study aimed to evaluate sural nerve conduction impairments (SNCI) as an objective DPN marker and the contribution of bilirubin to SNCI.

MATERIALS AND METHODS: Using DPN-Check

RESULTS: The incidence of SNCI was 72.0%. The sensitivity and specificity of SNCI for DPN prediagnosis by simplified criteria were 54.6 and 90.5%, respectively, and similarly corresponded with diabetic retinopathy and nephropathy (sensitivity 57.4 and 50.0%, respectively). SNCI significantly related to diabetes duration, declined estimated glomerular filtration rate, albuminuria and total bilirubin. SNCI incidence was attenuated in the higher bilirubin tertiles (89.8/65.3/54.8%, P < 0.001). Bilirubin was an independent inverse risk factor for SNCI, even after adjustment by known risk factors for DPN and markers for microvascular complications.

CONCLUSIONS: SNCI is a comprehensive marker for diabetic complications. We first showed the independent inverse relationship between bilirubin and SNCI through the independent pathway with other complications, provably reducing oxidative stress, as previously reported.

© 2021 The Authors. Journal of Diabetes Investigation published by Asian Association for the Study of Diabetes (AASD) and John Wiley & Sons Australia, Ltd.

Keywords: Bilirubin; Diabetic neuropathies; Oxidative stress

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