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Comparison of Methods to Estimate Arterial Blood Pressure from the Pulse Arrival Time by Finger Photoplethysmography

Castiglioni P.
Writing – Original Draft Preparation
;Merati G.;
2024-01-01
2024
2024
2-s2.0-85209094600
Objective: Promising methods for monitoring blood pressure (BP) are based on the Pulse Arrival Time (PAT) from finger photoplethysmography (PPG). This study aims to investigate the impact of PPG fiducial points, wavelengths, and PAT calibration models on short-term BP estimations. Methods: A multi-wavelength multi-sensor PPG device was developed to measure PAT beat-by-beat in 10 volunteers during an exercise protocol. Four calibration models (2-coefficient inverse, squared inverse, and logarithmic; and 3-coefficient inverse), four fiducial points (wave onset, peak, maximum derivative, and tangents intersection), and three wavelengths (red, infrared, and green) were compared to esti-mate BP on 5-minute segments and single beats. Finger systolic and diastolic BP served as reference. Results: Estimation errors were higher for systolic than diastolic BP. Acceptable (<5 mmHg) Median Absolute Errors (MAE) for 5-minute average systolic BP were achieved by combining red or infrared wavelengths with inverse or squared-inverse calibrations. For single-beat estimates, MAEs were higher but remained <8 mmHg with red or infrared wavelengths, maximum derivative or tangents intersection fiducial points, and 2-coefficient calibrations. Conclusion: Short-term BP estimation from finger PAT is feasible by properly combining calibration models, wavelengths, and fiducial points. Significance: Identifying the optimal parameters for estimating BP from finger PAT by PPG, this study contributes to the development of non-invasive devices for accurate and continuous BP monitoring both in clinical settings and in the general population.
Scandelli, A.; Lombardi, C.; Castiglioni, P.; Merati, G.; Villa, F.; Faini, A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2185971
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