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A new method of screening for diabetic neuropathy using laser Doppler and photoplethysmography

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Abstract

The purpose of this study is to suggest a simple, new method of screening for diabetic neuropathy. We measured blood volume changes by photoplethysmography (PPG) and blood perfusion by laser Doppler (LD) in the index fingers and big toes in 40 control subjects and in 50 (19 mild, 17 moderate, and 14 severe based on the nerve conduction velocity (NCV) test) and 35 diabetic patients with and without neuropathy, respectively. According to the results of PPG and LD measurements, the toe to finger ratios obtained from the neuropathic group were significantly higher than those from the control (p < 0.001) and the non-neuropathic groups (p < 0.001). Based on the NCV, the sensitivity of the LD method (92.0%) was higher than that of the PPG method (84.0%) for both left and right sides. Although specificity of the LD (92.8%) was also higher than the PPG (84.3%) bilaterally, the PPG showed better reproducibility (5.5 versus 9.5%) and a significant ratio increase with severity, while the LD did not. Our suggested PPG method using the toe to finger ratio is reliable, simple, economical, and accurate, and could become an effective new screening tool for the early detection of diabetic neuropathy.

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Acknowledgments

This study was supported by a grant from Korea Health 21 R&D Project, Ministry of Health & Welfare, Republic of Korea in 2005 (Grant No. A040032) and from The Brain Korea 21 Project for Medical Science, Yonsei University.

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Authors and Affiliations

  1. Department of Medical Engineering, College of Medicine, Yonsei University, Seoul, 120-752, South Korea

    Sung Woo Kim & Deok Won Kim

  2. Graduate School of Bio and Information Technology, Hankyong National University, Anseong, South Korea

    Soo Chan Kim

  3. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan

    Ki Chang Nam

  4. Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Yonsei University, Seoul, South Korea

    Eun Seok Kang

  5. Division of Electronics and Information Engineering, Chonbuk National University, Chonju, South Korea

    Jae Jung Im

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  1. Sung Woo Kim
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  2. Soo Chan Kim
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  3. Ki Chang Nam
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  4. Eun Seok Kang
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  5. Jae Jung Im
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Correspondence to Deok Won Kim.

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Kim, S.W., Kim, S.C., Nam, K.C. et al. A new method of screening for diabetic neuropathy using laser Doppler and photoplethysmography. Med Bio Eng Comput 46, 61–67 (2008). https://doi.org/10.1007/s11517-007-0257-z

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  • DOI: https://doi.org/10.1007/s11517-007-0257-z

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