Effects of skin surface temperature on photoplethysmograph.

In Jeong,Hyunjeong Kang,Hojun Yeom,Hyungro Yoon

doi:10.1260/2040-2295.5.4.429

Abstract

Photoplethysmograph (PPG) has been widely used to investigate various cardiovascular conditions. Previous studies demonstrated effects of temperature of the measurement environment; however, an integrated evaluation has not been established in environments with gradual air temperature variation. The purpose of this study is to investigate variations and relationships of blood pressure (BP), PPG and cardiovascular parameters such as heart rate (HR), stroke volume (SV), cardiac output (CO) and total peripheral resistance (TPR), by changing skin surface temperature (SST). Local mild cooling and heating was conducted on 16 healthy subjects. The results showed that local SST changes affected Finometer blood pressures (Finger BP), PPG components and TPR, but not the oscillometric blood pressure (Central BP), HR, SV and CO, and indicated that temperature must be maintained and monitored to reliably evaluate cardiovascular conditions in temperature-varying environments.

Highlights

Photopletysmograph (PPG) is an optical technique that can be used to non-invasively observe changes in blood flow in peripheral blood vessels
A hand hole was covered by silicon, and transparent acrylic observation windows were provided toward the participant and on the opposite side to confirm the positioning of left hand
blood pressure (BP) and Temperatures During the cooling period, the chamber air temperature was decreased to -9.4±0.7 ̊C, p < 0.01)

Summary

Introduction

Photopletysmograph (PPG) is an optical technique that can be used to non-invasively observe changes in blood flow in peripheral blood vessels. PPG indirectly measures cardiovascular conditions through aspects such as scattering, absorption, reflection, transmission, and fluorescence using the optical sensor with a light source [1]. PPG is classified into the alternating current (AC) component and the direct current (DC) component. PPG components have been used to detect diseases of the peripheral blood vessels which affect arterial blood circulation, assess blood pressure (BP), cardiac output (CO) and the elasticity of blood vessels, and measure arterial oxygen saturation [1]

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