Study on Ballistocardiogram Acquisition in a Moving Wheelchair with Embedded Sensors

Pinheiro, Eduardo; Postolache, Octavian; Girão, Pedro Silva

doi:10.2478/v10178-012-0065-0

Cited by 18 publications

(16 citation statements)

References 26 publications

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“…P 4 represented the upright sitting condition and was considered since some patients are not able to stand still on the scale. Such seated BCG measurements have been considered in the literature [11], [30], but this important comparison of signal quality and feature accuracy has not been conducted to date. Finally, the reason for including P 5 in this study was to explore the increase in pressure wave reflections at the femoral bifurbication and how these reflections affect the BCG.…”

Section: Methodsmentioning

confidence: 99%

Quantifying and Reducing Posture-Dependent Distortion in Ballistocardiogram Measurements

Javaid

Wiens

Fesmire

et al. 2015

IEEE J. Biomed. Health Inform.

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Ballistocardiography is a non-invasive measurement of the mechanical movement of the body caused by cardiac ejection of blood. Recent studies have demonstrated that ballistocardiogram (BCG) signals can be measured using a modified home weighing scale, and used to track changes in myocardial contractility and cardiac output. With this approach, the BCG can potentially be used both for preventive screening and for chronic disease management applications. However, for achieving high signal quality, subjects are required to stand still on the scale in an upright position for the measurement; the effects of intentional (for user comfort) or unintentional (due to user error) modifications in the position or posture of the subject during the measurement have not been investigated in the existing literature. In this study, we quantified the effects of different standing and seated postures on the measured BCG signals, and on the most salient BCG-derived features compared to reference standard measurements (e.g., impedance cardiography). We determined that the standing upright posture led to the least distorted signals as hypothesized, and that the correlation between BCG-derived timing interval features (R-J interval) and the pre-ejection period, PEP (measured using ICG), decreased significantly with impaired posture or sitting position. We further implemented two novel approaches to improve the PEP estimates from other standing and sitting postures, using system identification and improved J-wave detection methods. These approaches can improve the usability of standing BCG measurements in unsupervised settings (i.e. the home), by improving the robustness to non-ideal posture, as well as enabling high quality seated BCG measurements.

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Section: Methodsmentioning

confidence: 99%

Quantifying and Reducing Posture-Dependent Distortion in Ballistocardiogram Measurements

Javaid

Wiens

Fesmire

et al. 2015

IEEE J. Biomed. Health Inform.

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“…The selection of the most suitable modality can efficiently enhance the accuracy of the non-invasive blood pressure measurement based on wearable devices. For instance, ballistocardiography (BCG) and seismocardiography have recently attracted attention [146] and several BCG and SCG transducing modality sensors utilizing different conductive materials have become available including PVDF [147] and PVDF/Au electrodes in a skin soft electronic tattoo [148], Au/PET and graphene/PMMA at thermal release tape (TRT) or tattoo paper [149], biaxial PP film based on EmFi [150] and a polysilicon surface-micromachined and monolith silicon based on MEMS [150,151].…”

Section: Transducing Modalities and Materials For Non-invasive Blood mentioning

confidence: 99%

Blood Pressure Sensors: Materials, Fabrication Methods, Performance Evaluations and Future Perspectives

Al-Qatatsheh

Morsi

Zavabeti

et al. 2020

Sensors

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Advancements in materials science and fabrication techniques have contributed to the significant growing attention to a wide variety of sensors for digital healthcare. While the progress in this area is tremendously impressive, few wearable sensors with the capability of real-time blood pressure monitoring are approved for clinical use. One of the key obstacles in the further development of wearable sensors for medical applications is the lack of comprehensive technical evaluation of sensor materials against the expected clinical performance. Here, we present an extensive review and critical analysis of various materials applied in the design and fabrication of wearable sensors. In our unique transdisciplinary approach, we studied the fundamentals of blood pressure and examined its measuring modalities while focusing on their clinical use and sensing principles to identify material functionalities. Then, we carefully reviewed various categories of functional materials utilized in sensor building blocks allowing for comparative analysis of the performance of a wide range of materials throughout the sensor operational-life cycle. Not only this provides essential data to enhance the materials’ properties and optimize their performance, but also, it highlights new perspectives and provides suggestions to develop the next generation pressure sensors for clinical use.

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“…Other variants are based on piezoelectric polymer film, such as electromechanical film (EMFi) or polyvinylidene fluoride (PVDF), which have been placed under a bed's mattress (as single sheet [19]- [21] or as an array [22], [23]), on the seating area and backrest of (wheel-)chairs [24]- [27], as well as under bed posts [28] or chair legs [26]. Furthermore, pneumatic and hydraulic methods based on measuring the pressure variations in air cushions [29], air mattresses [30], or water-filled tubing [31], [32] have been used for monitoring in bed.…”

Section: A Ballisto-and Seismocardiographymentioning

confidence: 99%

Ambient and Unobtrusive Cardiorespiratory Monitoring Techniques

Brüser

Antink

Wartzek

et al. 2015

IEEE Rev. Biomed. Eng.

147

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Monitoring vital signs through unobtrusive means is a goal which has attracted a lot of attention in the past decade. This review provides a systematic and comprehensive review over the current state of the field of ambient and unobtrusive cardiorespiratory monitoring. To this end, nine different sensing modalities which have been in the focus of current research activities are covered: capacitive electrocardiography, seismo- and ballistocardiography, reflective photoplethysmography (PPG) and PPG imaging, thermography, methods relying on laser or radar for distance-based measurements, video motion analysis, as well as methods using high-frequency electromagnetic fields. Current trends in these subfields are reviewed. Moreover, we systematically analyze similarities and differences between these methods with respect to the physiological and physical effects they sense as well as the resulting implications. Finally, future research trends for the field as a whole are identified.

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Study on Ballistocardiogram Acquisition in a Moving Wheelchair with Embedded Sensors

Cited by 18 publications

References 26 publications

Quantifying and Reducing Posture-Dependent Distortion in Ballistocardiogram Measurements

Quantifying and Reducing Posture-Dependent Distortion in Ballistocardiogram Measurements

Blood Pressure Sensors: Materials, Fabrication Methods, Performance Evaluations and Future Perspectives

Ambient and Unobtrusive Cardiorespiratory Monitoring Techniques

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