![]() ![]() In epidemiologic studies, assessments were usually performed by rotative technical staff requiring high standardization of assessments. However, a learning phase and ongoing training is required to obtain accurate and reliable results. ![]() Therefore, it is of interest for epidemiologic research where it can be utilized as a screening tool for PAD or as risk factor for cardiovascular events.Ĭurrent guidelines consider the handheld Doppler sonography as the gold-standard for ABI determination. Several population-based studies demonstrated a high predictive value of ABI for global cardiovascular risk (, for Review see ). ![]() Since PPG-based ABI values are inflated compared to Doppler, it will be necessary to adjust Doppler-based cut-offs for risk stratification.Īnkle-Brachial Index (ABI) is an easily assessable diagnostic quotient noninvasively detecting the presence of peripheral artery disease (PAD). Conclusionsīoth devices proved to be feasible in epidemiologic studies, but compared to Doppler, do not constitute an advantage regarding time requirement and accuracy of ABI assessment. ![]() Inter-observer concordance was non-significantly better for Vicorder. Intra-observer concordances were similar. This effect is more pronounced for Vascular Explorer but can be ameliorated using the deflation method of measurement. Both automated devices showed significantly higher ABI compared to Doppler which can be traced back to higher brachial pressures (Vicorder) or higher ankle pressures (Vascular Explorer). Agreement of multiple measurements was moderate for both methods highlighting the importance of measurement replicates. ResultsĪcceptance was similar for both devices but Vascular Explorer was more time consuming. Differences between cuff inflation- and deflation-based methods were also studied for Vascular Explorer. We determined acceptance, time requirements, agreement of repeat measurements, agreement with Doppler and intra- and inter-observer concordances for both devices and compared the results. Two devices for PPG-based ABI assessments (Vicorder, Vascular Explorer) were tested and compared against Doppler in 56 putatively healthy subjects. The aim of this study was to establish novel photo-plethysmography (PPG)-based ABI assessments in an epidemiologic context and to compare its results with those of Doppler. Ankle-brachial-Index (ABI) measured by manual Dopplersonography is an easily assessable marker of global cardiovascular risk. ![]()
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