Key result
PPG-based blood pressure estimation using vertical hand movement achieved mean absolute errors of 6.63 ± 5.59 mmHg for systolic and 3.96 ± 3.82 mmHg for diastolic blood pressure.
Why the study?
To investigate whether morphological changes in PPG signals induced by vertical hand movement in the sagittal plane can improve BP estimation compared to a standstill recording.
Does blood pressure estimation using PPG signals from a moving fingertip improve accuracy compared to a standstill finger in human subjects?
Does blood pressure estimation using PPG signals from a moving fingertip improve accuracy compared to a standstill finger in human subjects?
Recording PPG signals from a moving fingertip provides morphological changes that enable accurate blood pressure estimation meeting clinical standards, with potential for smartphone implementation.
In this article, we present a new photoplethysmogram (PPG)-based blood pressure (BP) estimation approach, in which the PPG recording site (fingertip) is not in a standstill position but swings up and down in the sagittal plane during the recording. The upward and downward movements of the recording site result in useful morphological changes in the PPG signal, which can be used to better estimate BP. To investigate the effect of the vertical hand movement on the shape of the PPG signal, we first devised a PPG recording hardware and used it to collect a dataset consisting of PPG signals recorded from 120 subjects. Then, we utilized machine-learning models to estimate BP using the extracted features from the recorded PPG signals. The mean absolute and the standard deviation (STD) of the error for systolic BP (SBP) and diastolic BP (DBP) estimations were 6.63 ± 5.59 and 3.96 ± 3.82 mmHg, respectively. The results comply with the Advancement of Medical Instrumentation (AAMI) standard for BP measurement. They also achieve Grade A for diastolic and Grade B for SBP and mean BP, based on British Hypertension Society (BHS) standard. We conclude that the changes in PPG signal morphology provide more informative features resulting in more accurate BP estimation compared to using PPG signals recorded from a standstill finger. Moreover, the proposed BP estimation method has great potential for implementation in smartphones to monitor BP more accurately than the previous methods, in which the recording site is in a standstill position.
No takes yet. Share an insight, caveat, or question.
Mansourinezhad et al. (2023) studied Blood pressure estimation (n=120). PPG-based blood pressure estimation with vertical hand movement vs. PPG signals recorded from a standstill finger was evaluated on Mean absolute error and standard deviation for systolic and diastolic BP estimations. PPG-based blood pressure estimation using vertical hand movement achieved mean absolute errors of 6.63 ± 5.59 mmHg for systolic and 3.96 ± 3.82 mmHg for diastolic blood pressure.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: