P7 Assessing Vascular Age from Peripheral Pulse Waves: a Study of Existing Indices, and Directions for Future Research
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Purpose: Vascular age may be a better marker of cardiovascular risk than age. It has been proposed that vascular age could be assessed easily and inexpensively from the photoplethysmogram (PPG) pulse wave, which is measured by pulse oximeters and fitness bands. Our aim was to assess the performance of existing PPG-derived indices and provide directions for future research.
Methods: Two datasets were used. The Airwave dataset  contains finger PPG pulse waves alongside brachial-femoral pulse wave velocities (PWVs) from police employees: high quality data from 4,378 subjects aged 20 to 66 were used in this study. The arterial pulse wave database  contains simulated PPG pulse waves for 3,837 virtual subjects aged 25 to 75 exhibiting healthy ageing and normal variation in cardiovascular properties. Pulse wave features were derived, and the following indices were assessed: the ageing index (AGI) , modified AGI , informal AGI , and a novel AGI obtained by fitting a linear regression model to the five features most strongly correlated with age.
Results: See Figure 1. Existing indices correlated weakly with age. The new AGI was more strongly correlated with age on both datasets. It was weakly correlated with PWV and BP on Airwave, but strongly correlated with PWV on simulated data.
Conclusion: The improved performance of the new AGI indicates that there is scope for improving PPG-derived indices of vascular ageing. Indices appear to be correlated with age, PWV and BP, indicating that with further research they could be useful markers of cardiovascular risk.
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Cite this article
TY - JOUR AU - Peter Charlton AU - Maria Aresu AU - Jeanette Spear AU - Phil Chowienczyk AU - Jordi Alastruey PY - 2020 DA - 2020/02/15 TI - P7 Assessing Vascular Age from Peripheral Pulse Waves: a Study of Existing Indices, and Directions for Future Research JO - Artery Research SP - S49 EP - S49 VL - 25 IS - Supplement 1 SN - 1876-4401 UR - https://doi.org/10.2991/artres.k.191224.042 DO - 10.2991/artres.k.191224.042 ID - Charlton2020 ER -