Effects of different contacting pressure on the transfer function between finger photoplethysmographic and radial blood pressure waveforms
Abstract
BACKGROUND: The blood pressure (BP) waveform is suggested to reflect the whole-body blood supply distribution, but its non-invasive assessment is not sufficiently user friendly for practical applications. The present authors studied the correlation between BP and photoplethysmography (PPG) waveforms, with the aim of determining the optimal range for contact pressure stimulation (PS) to produce a reliable transfer function in their harmonic parameters. METHODS: Finger PPG and radial-artery BP signals were measured simultaneously and noninvasively on healthy volunteers (n = 45). PS of 0-200 mmHg was applied to the finger, and 1 min data sequences were recorded. In frequency-domain analysis, linear regression was applied to the calculated amplitude ratios or the first five harmonics between BP and PPG waveforms. RESULTS: In the 60 mmHg-PS group, the BP-PPG regression of amplitude ratios was highest, and the agreements between them were also the best verified by Bland-Altman analysis. CONCLUSION: In the present study, frequency-domain analysis was performed to study the correlation between BP and PPG waveforms. Differences in pressure-induced-vasodilation responses underlie the different BP-PPG waveform correlations obtained by applying different PSs. The non-invasively derived PPG parameters might help to provide an easier method to acquire the radial-artery BP waveform, and hence broaden the application of BP waveform analysis.
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The change in these fundamental features can affect other measurements such as the b/a ratio, the relationship between the frequency response of a PPG signal and a blood pressure signal, or the pulse transit time (PTT).
“The change in these fundamental features can affect other measurements such as the b/a ratio, derived from the a and b peaks of the second derivative of a PPG signal, used to characterize arterial stiffness [132], the relationship between the frequency response of a PPG signal and a blood pressure signal [207], or the pulse transit time (PTT) which is used as an indicator for fluctuating stiffness”
From Sources of inaccuracy in photoplethysmography for continuous cardiovascular monitoring (2021) · cites this paper as [207]
At 60 mmHg, there were the greatest R2 values for four out of five harmonics, and with different applied pressures, the R2 values ranged from 0.13 to 0.77 for the first harmonic.
“At 60 mmHg, there were the greatest R2 values for four out of five harmonics, and with the different applied pressures, the R2 values ranged from 0.13 to 0.77 for the first harmonic.”
From Sources of inaccuracy in photoplethysmography for continuous cardiovascular monitoring (2021) · cites this paper as [207]
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- Authors
- Hsiu, H., Hsu, C.-L., & Wu, T.-L.
- Affiliations
- National Taiwan University of Science and Technology (TW)
- Yuan Ze University (TW)
- Corresponding author
- Hsiu, H
- ORCID
- Hsiu, H
- Venue
- Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine
- Publisher
- SAGE Publications
- Published
- 2011-06
- Volume
- 225
- Issue
- 6
- Pages
- 575-583
- ISSN
- 0954-4119 (ISSN-L)
- 2041-3033
- OpenAlex
- W2323988838
- Cited by
- 46
- References
- 19
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 1 · 2023: 9 · 2022: 3 · 2021: 4 · 2020: 5 · 2019: 5 · 2018: 3 · 2017: 3 · 2016: 1 · 2015: 2 · 2014: 3 · 2013: 2 · 2012: 1
- FWCI
- 1.32
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Council
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Non-Invasive Vital Sign Monitoring
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Health and Disease Prevention
- Health Sciences › Medicine › Surgery › Hemodynamic Monitoring and Therapy
- Keywords
- finger photoplethysmography, amplitude ratio, harmonic analysis, non-invasive blood pressure measurement, frequency domain analysis
- MeSH terms
- Adult, Algorithms, Blood Pressure, Blood Pressure Determination, Fingers, Humans, Male, Linear Models, Photoplethysmography, Radial Artery
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