A Study on the Method to Predict Peripheral Arterial Disease (PAD) by using Finger-Toe Index (FTI)

M.-K. Byeon, S.-W. Han, S.-H. Lim, and W. Huh (Korea)


peripheral arterial disease (PAD), finger-toe index (FTI),ankle brachial index (ABI), upstroke time (UT), Bloodpressure, photoplethysmography (PPG)


In this paper, the purpose is to propose a new and a simpler parameter than the previous method which uses an ordinary blood pressure cuff and a Doppler ultrasound blood flow detector in order to predict the severity of PAD(Peripheral arterial disease). For the simpler system, we developed 4 channels of PPG (photoplethysmography) and proposed a new analysis parameter: finger-toe index (FTI). In order to verify the usefulness of the developed system and the new analysis parameter, the experiments were performed on 43 normal subjects. The new analysis parameter: FTI was compared with ABI (ankle-brachial index) using regression analysis method. There are two main findings of this study: first, the proposed parameter, FTI is more strongly correlated with age than ABI. The correlation coefficient between each parameter, FTI & ABI, and age was observed to be 0.642 and 0.271 respectively. The regression coefficient between the parameters, FTI & PTT, and ABI & PTT was observed to be 0.60 and 0.10 respectively. Secondly, the proposed parameter is a more quantitative index. For the same subject group (n=43), the result of ABI showed that all subjects are in a single state group but the results of FTI classified the subjects into three state group.

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