Why the study?
Pulse-wave velocity can be measured continuously and across multiple body sites using photoplethysmography, but agreement of a simple device with a referent device required evaluation.
Does a simple photoplethysmography (PPG) pulse-wave velocity (PWV) method agree with a referent device for measuring arterial stiffness?
Does a simple photoplethysmography (PPG) pulse-wave velocity (PWV) method agree with a referent device for measuring arterial stiffness?
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Photoplethysmography can continuously measure pulse-wave velocity at multiple arterial segments with moderate-strong overall agreement compared to a referent device, adequately capturing acute changes in lower-limb PWV.
Objective: Pulse-wave velocity (PWV), a common measure of arterial stiffness, can be measured continuously and across multiple body sites using photoplethysmography (PPG). The objective was to determine whether a simple photoplethysmography PPG PWV method agrees with a referent device. Approach: , 18 female), three measurements were made: two supine baseline measurements (Base 1, Base 2) and one measurement (Tilt) 5 min after a modified head-up tilt test (mHUTT). Overall agreement and repeated measures agreement (change in PPG PWV from Base to Tilt vs. change in referent PWV from Base to Tilt) were calculated using linear mixed models. Agreement estimates were expressed as intra-class correlation coefficients (ICC). Main results: For hfPWV there was strong overall agreement (ICC: 0.77, 95%CI: 0.67-0.85), but negligible and non-significant repeated measures agreement (ICC: 0.10, 95%CI: -0.18 to 0.36). For htPWV, there was moderate overall agreement (ICC:0.50, 95%CI: 0.31-0.65) and strong repeated measures agreement (ICC: 0.81, 95%CI: 0.69-0.89). Significance: Photoplethysmography can continuously measure PWV at multiple arterial segments with moderate-strong overall agreement. While further work with upper-limb PPG PWV is needed, PPG can adequately capture acute changes in lower-limb PWV.
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Zieff et al. (2023) studied this question.
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