Nardelli Mimma, Greco Alberto, Vanello Nicola, Scilingo Enzo Pasquale
Annu Int Conf IEEE Eng Med Biol Soc. 2021 Nov;2021:492-495. doi: 10.1109/EMBC46164.2021.9630550.
Photoplethysmography (PPG) is a completely noninvasive, optical method of assessing blood flow dynamics in peripheral vasculature. Wearable devices for PPG recording are becoming increasingly popular, due to their cost-effectiveness and ease of use. For these reasons, many recent scientific studies have proposed the use of pulse rate variability (PRV) extracted from PPG as a surrogate for heart rate variability (HRV), in monitoring autonomic activity and cardiovascular health.In this work, we used a cross-mapping approach, a methodology based on chaos theory, to compare PRV and HRV dynamics, and investigate their agreement according to age and gender of healthy subjects. We used ECG and PPG data acquired from 57 subjects (41 young and 16 elderly) during resting state in the supine position. Signals were gathered from the publicly available VORTAL dataset. Our results showed a statistically significant decrease of PRV reliability as an HRV surrogate in old participants, which was confirmed as significant when only men subjects were analyzed (p-value<0.01).Our findings, although preliminary, suggest greater caution in the use of PPG devices for monitoring cardiovascular health, especially in elderly men.
光电容积脉搏波描记法（PPG）是一种完全无创的光学方法，用于评估外周血管系统中的血流动力学。用于记录PPG的可穿戴设备因其成本效益高且使用方便而越来越受欢迎。出于这些原因，最近许多科学研究都提出，在监测自主神经活动和心血管健康时，使用从PPG中提取的脉搏率变异性（PRV）作为心率变异性（HRV）的替代指标。在这项工作中，我们使用了一种交叉映射方法，一种基于混沌理论的方法，来比较PRV和HRV的动态变化，并根据健康受试者的年龄和性别研究它们之间的一致性。我们使用了从57名受试者（41名年轻人和16名老年人）在仰卧位静息状态下采集的心电图（ECG）和PPG数据。信号来自公开可用的VORTAL数据集。我们的结果显示，在老年参与者中，PRV作为HRV替代指标的可靠性在统计学上显著降低，在仅分析男性受试者时，这一结果也被确认为显著（p值<0.01）。我们的研究结果虽然是初步的，但表明在使用PPG设备监测心血管健康时应更加谨慎，尤其是在老年男性中。
