Key result
A multivariate model combining seismocardiogram amplitude and pulse transit time from a chest-worn device outperformed conventional univariate models for systolic blood pressure estimation.
Why the study?
PTT-based blood pressure estimation lacks performance in SBP estimation, and its daily life use is limited by the need for bulky measurement systems.
Does a single chest-worn device using a combination of pulse transit time and seismocardiogram amplitude improve continuous systolic blood pressure estimation in healthy males?
Observational (n=30)
Does a single chest-worn device using a combination of pulse transit time and seismocardiogram amplitude improve continuous systolic blood pressure estimation in healthy males?
A novel chest-worn device combining pulse transit time and seismocardiogram amplitude improves cuffless continuous systolic blood pressure estimation compared to conventional models.
May support wearable cuffless BP monitoring; leaves open prospective validation in clinical populations before adoption.
Continuous blood pressure (BP) monitoring in daily life is needed to enable early detection of hypertension and improve its control. Although pulse transit time (PTT)-based BP estimation represents a promising approach, it still lacks of performance in systolic blood pressure (SBP) estimation and its use in daily life is limited owing to the requirement of bulky systems for measurement of PTT. This study aims at developing a wearable system providing continuous PTT measurement and enhanced SBP estimation for continuous BP monitoring. A single chest-worn device was developed, which measures the photoplethysmogram and seismocardiogram simultaneously, and thereby obtains PTT by time difference between two signals. A multivariate model using the seismocardiogram amplitude (SA) in conjunction with PTT was proposed for SBP estimation, and validated against 30 healthy males (31.47 ± 7.23 years old). Performance of the proposed model was compared with that of conventional univariate models using PTT or pulse arrival time in two types of BP interventions, and for the verification of real use in daily life, performance assessment with calibration and BP monitoring in daily life were conducted. The results suggested that the proposed model (1) outperformed the conventional models, (2) showed potential to be generalized with just a simple calibration, and (3) demonstrated the potential of continuous BP monitoring in daily life. In conclusion, the presented system provides an improved performance of continuous BP monitoring by using a combination of PTT and SA with a convenient and compact single chest-worn device, and thus, it can contribute to mobile healthcare services.
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Park et al. (2019) conducted an observational in Healthy (n=30). Multivariate model using seismocardiogram amplitude and pulse transit time via a single chest-worn device vs. Conventional univariate models using pulse transit time or pulse arrival time was evaluated on Systolic blood pressure (SBP) estimation performance. A multivariate model combining seismocardiogram amplitude and pulse transit time from a chest-worn device outperformed conventional univariate models for systolic blood pressure estimation.
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