Piezoelectric probe for pressure waveform estimation in flexible tubes and its application to the cardiovascular system

Almeida, Vânia; Pereira, Helena; Pereira, Tânia; Figueiras, Edite; Borges, Elisabeth; Cardoso, J. M. R.; Correia, C.M.B.A.

doi:10.1016/j.sna.2011.04.048

Cited by 22 publications

(17 citation statements)

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“…It will consist of a multichannel systems that incorporate some conventional sensors (including pulse oximetry and photoplethysmography) allied with pioneer sensors developed at the group [12][13][14][15].…”

Section: Motivationmentioning

confidence: 99%

Photoplethysmographic logger with contact force and hydrostatic pressure monitoring

Santos

Almeida

Cardoso

et al. 2013

2013 IEEE 3rd Portuguese Meeting in Bioengineering (ENBENG)

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Esta cópia da tese é fornecida na condição de que quem a consulta reconhece que os direitos de autor são pertença da Universidade de Coimbra e que nenhuma citação ou informação obtida a partir dela pode ser publicada sem a referência apropriada.This copy of the thesis has been supplied on condition that anyone who consults it is understood to recognize that its copyright rests with University of Coimbra and that no quotation from the thesis and no information derived from it may be published without proper acknowledgement. This work is funded by FEDER, through the Programa Operacional Factores deCompetitividade -COMPETE -and by National funds through FCT -Fundação para a Ciência e Tecnologia -in the frame of -Centro Aos companheiros Gonçalo Costa, Hugo Ramalho e Tiago Leal, que ao meu lado deram incontáveis braçadas (eu mais do que eles!) dentro e fora da piscina, um agradecimento particular. Uma palavra de apreço também para o amigo de infância, Ricardo Pimentel, pelos muitos momentos partilhados ao longo de todo este tempo.Ainda um brinde em honra de quem nestes anos me acompanhou: Carla Guerra, Carolina Francisco, Gabriel Campos, Mariana Sequeira e Susete Neiva. The current work aims to develop a stand-alone pulse oximeter and a photoplethysmographic (PPG) system with measurements of the contact force and height of the finger relatively to the heart. This module, together with other measurements (e.g.electrocardiogram and pulse wave velocity), will be part of a multichannel platform that will be taken to clinical environment.The project comprises the design of hardware for signal conditioning, as well as the development of firmware to implement in a microcontroller unit (the Arduino™). The latter is used to control the system, acquire data and compute , heart rate ( ), contact force and height.Currently, the system is able to retrieve a stable PPG waveform and compute the in real time through the PPG signal peaks and valleys. Signals acquired in a healthy subject lead to a value of . Moreover, the subject arm and forearm orientation is retrieved by the use of accelerometers and used to compute the offset of the finger relatively to the heart. Contact force between the finger and the probe is also measured. Keywords

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Section: Motivationmentioning

confidence: 99%

Photoplethysmographic logger with contact force and hydrostatic pressure monitoring

Santos

Almeida

Cardoso

et al. 2013

2013 IEEE 3rd Portuguese Meeting in Bioengineering (ENBENG)

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“…APWs were recorded at a sampling rate of 1 kHz with a single non-invasive PZ probe developed in a previous work [28], and shown in Fig. 1(a) (main text).…”

Section: Pwa Measurementsmentioning

confidence: 99%

Cardiovascular risk analysis by means of pulse morphology and clustering methodologies

Almeida

Borba

Pereira

et al. 2014

Computer Methods and Programs in Biomedicine

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c o m p u t e r m e t h o d s a n d p r o g r a m s i n b i o m e d i c i n e 1 1 7 ( 2 0 1 4 ) [257][258][259][260][261][262][263][264][265][266] j o u r n a l h o m e p a g e : w w w . i n t l . e l s e v i e r h e a l t h . c o m / j o u r n a l s / c m p b a b s t r a c tThe purpose of this study was the development of a clustering methodology to deal with arterial pressure waveform (APW) parameters to be used in the cardiovascular risk assessment. One hundred sixteen subjects were monitored and divided into two groups. The first one (23 hypertensive subjects) was analyzed using APW and biochemical parameters, while the remaining 93 healthy subjects were only evaluated through APW parameters. The expectation maximization (EM) and k-means algorithms were used in the cluster analysis, and the risk scores (the Framingham Risk Score (FRS), the Systematic COronary Risk Evaluation (SCORE) project, the Assessing cardiovascular risk using Scottish Intercollegiate Guidelines Network (ASSIGN) and the PROspective Cardiovascular Münster (PROCAM)), commonly used in clinical practice were selected to the cluster risk validation. The result from the clustering risk analysis showed a very significant correlation with ASSIGN (r = 0.582, p < 0.01) and a significant correlation with FRS (r = 0.458, p < 0.05). The results from the comparison of both groups also allowed to identify the cluster with higher cardiovascular risk in the healthy group. These results give new insights to explore this methodology in future scoring trials.© 2014 Elsevier Ireland Ltd. All rights reserved. IntroductionThe atherosclerotic cardiovascular disease (CVD) is the most common cause of death worldwide, resulting from the combination of several risk factors [1]. The international guidelines [2,3] consider that individuals with established CVD should be the first priority for preventive measures application. The concern in changing the current healthcare paradigm, from reactive towards preventive care, aims at identify individuals for risk in early stages of disease development, and then, * Corresponding author. Tel.: +351 239410109.E-mail address: vaniagalmeida@lei.fis.uc.pt (V.G. Almeida).direct more efforts and attention to the risk factors modification [4,5]. Fortunately, this is an emergent tendency that can be addressed using the traditional risk scores, but also using innovative predictive algorithms. During the last years many risk estimation systems have been developed in order to assist clinicians in the risk assessment, and in the individual chances prediction, for CVD development. The major challenges of these tools are the capabilities to: (1) identify high risk individuals, (2) weight the individual effects of all risk factors, (3) stratify or organize who needs lifestyle advice or medical therapy, and finally (4) avoid http://dx

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“…Therefore, similar principle can be used to monitor these changes around the implanted graft materials to monitor complication within the graft. Some of the work has been done where a similar principle [102][103][104][105] has been used to monitor pressure changes around the implanted materials to monitor various complications in vivo. However, more work is required to isolate the contribution of pressure change due to the infection with other graft complications using piezoelectric materials.…”

Section: Piezoelectrical Transducermentioning

confidence: 99%

Sensor and biosensor to detect vascular graft infection: diagnosis and challenges

et al. 2012

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Piezoelectric probe for pressure waveform estimation in flexible tubes and its application to the cardiovascular system

Cited by 22 publications

References 15 publications

Photoplethysmographic logger with contact force and hydrostatic pressure monitoring

Photoplethysmographic logger with contact force and hydrostatic pressure monitoring

Cardiovascular risk analysis by means of pulse morphology and clustering methodologies

Sensor and biosensor to detect vascular graft infection: diagnosis and challenges

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