A wearable device for continuous monitoring of heart mechanical function based on Impedance CardioGraphy

Panfili, Guido; Piccini, Luca; Maggi, Luca; Parini, Sergio; Andreoni, Giuseppe

doi:10.1109/iembs.2006.260250

Cited by 9 publications

(6 citation statements)

References 6 publications

(5 reference statements)

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“…Front ends typically consist of a current generator running at a frequency between 20 and 150 kHz and a constant amplitude of 0.5-5 mA (Cybulski 2011) and a lock-in amplifier to amplify and demodulate the AC signal. Panfili et al propose a system (Panfili et al 2006) containing a sine wave current source running at 32 kHz with 20 µA amplitude. The system consumes 2.26 mW at 3.3 V supply.…”

Section: Impedance Cardiogrammentioning

confidence: 99%

A survey on signals and systems in ambulatory blood pressure monitoring using pulse transit time

2015

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Blood pressure monitoring based on pulse transit or arrival time has been the focus of much research in order to design ambulatory blood pressure monitors. The accuracy of these monitors is limited by several challenges, such as acquisition and processing of physiological signals as well as changes in vascular tone and the pre-ejection period. In this work, a literature survey covering recent developments is presented in order to identify gaps in the literature. The findings of the literature are classified according to three aspects. These are the calibration of pulse transit/arrival times to blood pressure, acquisition and processing of physiological signals and finally, the design of fully integrated blood pressure measurement systems. Alternative technologies as well as locations for the measurement of the pulse wave signal should be investigated in order to improve the accuracy during calibration. Furthermore, the integration and validation of monitoring systems needs to be improved in current ambulatory blood pressure monitors.

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Section: Impedance Cardiogrammentioning

confidence: 99%

A survey on signals and systems in ambulatory blood pressure monitoring using pulse transit time

2015

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“…It provides a continuous output of ECG, ICG and Galvanic Skin Response (GSR). Many other systems (Chiang et al 1997, Nakagawara and Yamakoshi 2000, Panfili et al 2006 have emerged employing similar measurement techniques with same measurement parameters. One of the advantages of ambulatory systems is that they allow testing in the real-life environment, under conditions of real activities, motion and environmental variables.…”

Section: Hemodynamic Monitoring Through Sf-biamentioning

confidence: 99%

Bioimpedance analysis as a tool for hemodynamic monitoring: overview, methods and challenges

Anand

Lowe

et al. 2021

Physiol. Meas.

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Recent advances in hemodynamic monitoring have seen the advent of non-invasive methods which offer ease of application and improve patient comfort. Bioimpedance Analysis or BIA is one of the currently employed non-invasive techniques for hemodynamic monitoring. Impedance Cardiography (ICG), one of the implementations of BIA, is widely used as a non-invasive procedure for estimating hemodynamic parameters such as stroke volume (SV) and cardiac output (CO). Even though BIA is not a new diagnostic technique, it has failed to gain consensus as a reliable measure of hemodynamic parameters. Several devices have emerged for estimating CO using ICG which are based on evolving methodologies and techniques to calculate SV. However, the calculations are generally dependent on the electrode configurations (whole body, segmental or localised) as well as the accuracy of different techniques in tracking blood flow changes. Blood volume changes, concentration of red blood cells, pulsatile velocity profile and ambient temperature contribute to the overall conductivity of blood and hence its impedance response during flow. There is a growing interest in investigating limbs for localised BIA to estimate hemodynamic parameters such as pulse wave velocity. As such, this paper summarises the current state of hemodynamic monitoring through BIA in terms of different configurations and devices in the market. The conductivity of blood flow has been emphasized with contributions from both volume and velocity changes during flow. Recommendations for using BIA in hemodynamic monitoring have been mentioned highlighting the suitable range of frequencies (1 kHz–1 MHz) as well as safety considerations for a BIA setup. Finally, current challenges in using BIA such as geometry assumption and inaccuracies have been discussed while mentioning potential advantages of a multi-frequency analysis to cover all the major contributors to blood’s impedance response during flow.

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“…Yazdanian et al [10] also developed a concept of a portable ICG system for SV assessment, with preliminary research showing significant correlations between SV measured using the cardiac impedance method and SV determined by Doppler echocardiography (r=0.89, P<.05). Panfili et al [11] presented a device for the continuous monitoring of CO, with transmission of the recorded signal via Bluetooth. Other researchers also tended to implement ICG devices for remote monitoring to a greater or lesser extent in their scientific concepts [12][13][14][15].…”

Section: Impedance Cardiographymentioning

confidence: 99%

Noninvasive Bioimpedance Methods From the Viewpoint of Remote Monitoring in Heart Failure

Krzesiński¹,

Sobotnicki²,

Gacek³

et al. 2021

JMIR Mhealth Uhealth

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Heart failure (HF) is a major clinical, social, and economic problem. In view of the important role of fluid overload in the pathogenesis of HF exacerbation, early detection of fluid retention is of key importance in preventing emergency admissions for this reason. However, tools for monitoring volume status that could be widely used in the home setting are still missing. The physical properties of human tissues allow for the use of impedance-based noninvasive methods, whose different modifications are studied in patients with HF for the assessment of body hydration. The aim of this paper is to present the current state of knowledge on the possible applications of these methods for remote (home-based) monitoring of patients with HF.

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A wearable device for continuous monitoring of heart mechanical function based on Impedance CardioGraphy

Cited by 9 publications

References 6 publications

A survey on signals and systems in ambulatory blood pressure monitoring using pulse transit time

A survey on signals and systems in ambulatory blood pressure monitoring using pulse transit time

Bioimpedance analysis as a tool for hemodynamic monitoring: overview, methods and challenges

Noninvasive Bioimpedance Methods From the Viewpoint of Remote Monitoring in Heart Failure

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