A System for Detection of Three-Dimensional Precordial Vibrations

Linnavuo, Matti; Paukkunen, Mikko; Haukilehto, Helena; Sepponen, Raimo

doi:10.4018/ijmtie.2012010104

Cited by 5 publications

(13 citation statements)

References 33 publications

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“…The respiration signal was measured from the chest. In addition to the measurements done especially for this study, some data from the authors' previous work [13] was also analyzed to back up the findings in this study.…”

Section: System Structurementioning

confidence: 99%

“…The measurement system is based on the system described by Paukkunen et al [13]. The measurement system consists of sensors and analog gain and filtering circuits for superior-inferior SCG, electrocardiography (ECG), photoplethysmography (PPG) and respiration, and data acquisition and communication units.…”

Section: System Structurementioning

confidence: 99%

“…In particular, the superior-inferior axis of the SCG has been demonstrated to have consistent waveforms [13] and can be of use in determining stroke volume [16]. While it is likely that the dorso-ventral axis and superior-inferior axis share similarities, it is also expected that there will be inherent differences between the axes.…”

Section: Introductionmentioning

confidence: 99%

“…While it is likely that the dorso-ventral axis and superior-inferior axis share similarities, it is also expected that there will be inherent differences between the axes. Figure 2 shows an annotated dorso-ventral SCG signal from the authors' previous study [13] compared to superior-inferior axis SCG signal. It is hypothesized that as the heart pumps the blood from the left ventricle to the aorta, more force is exerted on the superior-inferior axis instead the dorso-ventral axis.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the use of validation procedures, for example, echocardiography (ECHO) the points of mitral valve closure (MC), aortic valve opening (AO), maximum acceleration of blood in the aorta (MA), onset of rapid ejection of blood into the aorta (RE), aortic valve closure (AC), and mitral valve opening (MO) have been detected [11,12]. SCG is normally recorded in the dorso-ventral axis from the sternum [10], but many groups have presented with tri-axial approaches also [13][14][15]. Figure 1 depicts in detail the axes used in SCG research.…”

Section: Introductionmentioning

confidence: 99%

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A Portable Measurement System for the Superior-Inferior Axis of the Seismocardiogram

MJT¹,

MT²

2013

J Bioeng Biomed Sci

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Seismocardiography (SCG) is the measurement of vibration of the precordium due to cardiac movement. SCG is considered to be of value when cost-effective cardiac and circulatory assessment is needed. SCG is normally recorded in the dorso-ventral axis from the sternum, while it has been shown that the superior-inferior axis also has consistent waveforms and might be usable in stroke volume evaluation. Thus, it seems that a system focusing on the superiorinferior axis could be very useful. In this article, a portable measurement system for the measurement of the superiorinferior axis of the SCG is described, and its functioning is demonstrated. Four subjects were measured in the sitting position to verify the system's functioning. The measurements demonstrated the system's capability to capture accurate cardiovascular data. Future work includes the validation of the measurement of the superior-inferior of the SCG signal against an established method such as echocardiography.

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Section: System Structurementioning

confidence: 99%

Section: System Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Portable Measurement System for the Superior-Inferior Axis of the Seismocardiogram

MJT¹,

MT²

2013

J Bioeng Biomed Sci

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Beat-by-Beat Quantification of Cardiac Cycle Events Detected From Three-Dimensional Precordial Acceleration Signals

Paukkunen

Parkkila

Hurnanen

et al. 2016

IEEE J. Biomed. Health Inform.

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The vibrations produced by the cardiovascular system that are coupled to the precordium can be noninvasively detected using accelerometers. This technique is called seismocardiography. Although clinical applications have been proposed for seismocardiography, the physiology underlying the signal is still not clear. The relationship of seismocardiograms of on the back-to-front axis and cardiac events is fairly well known. However, the 3-D seismocardiograms detectable with modern accelerometers have not been quantified in terms of cardiac cycle events. A major reason for this might be the degree of intersubject variability observed in 3-D seismocardiograms. We present a method to quantify 3-D seismocardiography in terms of cardiac cycle events. First, cardiac cycle events are identified from the seismocardiograms, and then, assigned a number based on the location in which the corresponding event was found. 396 cardiac cycle events from 9 healthy subjects and 120 cardiac cycle events from patients suffering from atrial flutter were analyzed. Despite the weak intersubject correlation of the waveforms (0.05, 0.27, and 0.15 for the x-, y-, and z-axes, respectively), the present method managed to find latent similarities in the seismocardiograms of healthy subjects. We observed that in healthy subjects the distribution of cardiac cycle event coordinates was centered on specific locations. These locations were different in patients with atrial flutter. The results suggest that spatial distribution of seismocardiographic cardiac cycle events might be used to discriminate healthy individuals and those with a failing heart.

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Unified frame of reference improves inter-subject variability of seismocardiograms

et al. 2015

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BackgroundSeismocardiography is the noninvasive measurement of cardiac vibrations transmitted to the chest wall by the heart during its movement. While most applications for seismocardiography are based on unidirectional acceleration measurement, several studies have highlighted the importance of three-dimensional measurements in cardiac vibration studies. One of the main challenges in using three-dimensional measurements in seismocardiography is the significant inter-subject variability of waveforms. This study investigates the feasibility of using a unified frame of reference to improve the inter-subject variability of seismocardiographic waveforms.MethodsThree-dimensional seismocardiography signals were acquired from ten healthy subjects to test the feasibility of the present method for improving inter-subject variability of three-dimensional seismocardiograms. The first frame of reference candidate was the orientation of the line connecting the points representing mitral valve closure and aortic valve opening in seismocardiograms. The second candidate was the orientation of the line connecting the two most distant points in the three dimensional seismocardiogram. The unification of the frame of reference was performed by rotating each subject’s three-dimensional seismocardiograms so that the lines connecting the desired features were parallel between subjects.ResultsThe morphology of the three-dimensional seismocardiograms varied strongly from subject to subject. Fixing the frame of reference to the line connecting the MC and AO peaks enhanced the correlation between the subjects in the y axis from 0.42 ± 0.30 to 0.83 ± 0.14. The mean correlation calculated from all axes increased from 0.56 ± 0.26 to 0.71 ± 0.24 using the line connecting the mitral valve closure and aortic valve opening as the frame of reference. When the line connecting the two most distant points was used as a frame of reference, the correlation improved to 0.60 ± 0.22.ConclusionsThe results indicate that using a unified frame of reference is a promising method for improving the inter-subject variability of three-dimensional seismocardiograms. Also, it is observed that three-dimensional seismocardiograms seem to have latent inter-subject similarities, which are feasible to be revealed. Because the projections of the cardiac vibrations on the measurement axes differ significantly, it seems obligatory to use three-dimensional measurements when seismocardiogram analysis is based on waveform morphology.

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A System for Detection of Three-Dimensional Precordial Vibrations

Cited by 5 publications

References 33 publications

A Portable Measurement System for the Superior-Inferior Axis of the Seismocardiogram

A Portable Measurement System for the Superior-Inferior Axis of the Seismocardiogram

Beat-by-Beat Quantification of Cardiac Cycle Events Detected From Three-Dimensional Precordial Acceleration Signals

Unified frame of reference improves inter-subject variability of seismocardiograms

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