Programmable Test Bench for Hemodynamic Studies

Pereira, Helena; Cardoso, J. M. R.; Almeida, Vânia; Pereira, Tânia; Borges, Elisabeth; Figueiras, Edite; Ferreira, Luiz Fernando Lucas; Simões, José Augusto; Correia, C.M.B.A.

doi:10.1007/978-3-642-03882-2_387

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…These pressure sensors monitor the static pressure level, DC, of each experiment and are used as the main reference for wave velocity determination. The DC level is controlled by a piston-mass combination, P-m, placed at the extremity of the tube [9]. …”

Section: The Test Bench Systemmentioning

confidence: 99%

New instrumentation for cardiovascular risk assessment: The role of pulse wave velocity

Pereira

Almeida

et al. 2011

1st Portuguese Biomedical Engineering Meeting

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Over the last years, great emphasis has been placed on the role of arterial stiffness in the development of cardiovascular diseases. This hemodynamic parameter, generally associated to age and blood pressure increase, can be assessed by the measurement of pulse wave velocity (PWV). Currently available devices that measure PWV are expensive and need to be operated by skilled medical staff, reducing the potential of ambulatory setting. This research project aims at developing and testing the sensoring and algorithmic basis of an alternative and noninvasive device for PWV assessment. The proposed device is based on a double-headed sensor probe and allows the assessment of PWV in one single location, providing important information on local arterial hemodynamics. Although studies to validate the clinical use of this system are still required, it has already demonstrated good performance on a dedicated test bench system, capable of reproducing a range of relevant cardiovascular system's properties.

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Section: The Test Bench Systemmentioning

confidence: 99%

New instrumentation for cardiovascular risk assessment: The role of pulse wave velocity

Pereira

Almeida

et al. 2011

1st Portuguese Biomedical Engineering Meeting

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show abstract

“…Although the AP is a prototype suitable for clinical tests, designed to be combined with a PC Sound Card, it was necessary to use a different DAS in test bench experiments, in order to acquire additional reference signals. This test bench emulates the main arterial pressure wave propagation features of the cardiovascular system, presenting an upgrade in relation to the experimental setup developed previously by Pereira et al (Pereira et al, 2009). The main difference is based on the use of a natural rubber latex tube, considered to be a reliable material to simulate the compliance of a human artery and providing a higher distensibility than the silicon tube originally used.…”

Section: Test Setupsmentioning

confidence: 99%

A Novel and Low Cost Acoustic based Probe for Local Pulse Wave Velocity Estimation - Experimental Characterization and in-Vivo Feasibility

Pereira¹,

Maldonado²,

Pereira³

et al. 2013

Proceedings of the International Conference on Biomedical Electronics and Devices

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The use of local pulse wave velocity (PWV) as an independent risk factor for cardiovascular events and as a marker of atherosclerosis has been gained clinical relevance over the years. A novel acoustic double headed probe for non-invasive measurement of the local PWV is presented in this paper. The PWV is assessed in one single location and involves the determination of time delay between the signals acquired simultaneously by two acoustic sensors, placed ≈11 mm apart. Several tests were performed in special purposes test bench systems in order to characterize the acoustic probe (AP) regarding the existence of crosstalk between the transducers, repeatability, waveform analysis and also its time resolution. Results demonstrate the effectiveness of the AP in acquiring repeatedly the same waveform, with the possibility to measure higher PWV (14 m/s), with a relative error less than 5%, when using two uncoupled APs. In-vivo acquisitions were also carried out with the AP in the carotid artery of 17 healthy volunteers with the intention of local PWV and other hemodynamic parameters estimation, such as left ventricular ejection time (LVET). For the total of subjects' sample, the obtained mean carotid PWV was 2.96±1.08 m/s and the LVET mean value was 288.59±21.42 ms.

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“…The principle of APW measurement is based on the transmission of its mechanical energy that shows up as a displacement of the tissue surface (carotid artery) to the PZ surface. obtained in a dedicated test bench (Pereira et al, 2009). As the microcontroller cannot sample negative voltages, the PZ signal is level shifted by a convenient DC value before being fed to the amplifier.…”

Section: Pz Probementioning

confidence: 99%

A REAL TIME CARDIAC MONITORING SYSTEM - Arterial Pressure Waveform Capture and Analysis

Almeida¹,

Pereira²,

Borges³

et al. 2011

Proceedings of the 1st International Conference on Pervasive and Embedded Computing and Communication Systems

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An arterial pressure waveform recorder and analyser based on a Microchip PIC microcontroller (µC), dsPIC33FJ256GP710 is described in this article. Our purpose is to develop a dsPIC based signal monitoring and processing system for cardiovascular studies, specially dedicated to arterial pressure waveform (APW) capture. We developed a piezoelectric (PZ) probe designed to reproduce the APW from the pulsatile activity taken non-invasively at the vicinity of a superficial artery. The advantages in developing a microcontroller based system show up in decreasing the associate cost, as well as in increasing the functionality of the system. Based on a MathWorks Simulink platform, the system supports the development and transfer of program code from a personal computer to the microcontroller, and evaluation of its execution on rapid prototyping hardware. Results demonstrate that embedded system can be an alternative to be used in autonomous cardiovascular probes. Although additional studies are still required, this probe seems to be a valid, low cost and easy to use alternative to expensive and hard to manipulate devices in the market.

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Programmable Test Bench for Hemodynamic Studies

Cited by 8 publications

References 7 publications

New instrumentation for cardiovascular risk assessment: The role of pulse wave velocity

New instrumentation for cardiovascular risk assessment: The role of pulse wave velocity

A Novel and Low Cost Acoustic based Probe for Local Pulse Wave Velocity Estimation - Experimental Characterization and in-Vivo Feasibility

A REAL TIME CARDIAC MONITORING SYSTEM - Arterial Pressure Waveform Capture and Analysis

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