Non-invasive Laplacian Electrocardiography and Moment of Activation Mapping

Besio, Walter G.; Chen, Ting

doi:10.1109/iembs.2006.259934

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…For this study we used the new active Laplacian TCE sensor (Besio and Chen 2006) to acquire signals. The averaged cardiac activation cycle of the LECG on the body surface, BSLM which shows the Laplacian potential distribution at the time instant of the Lead II ECG R-wave peak, and Laplacian moment of activation (MOA) isochronal mapping (Besio et al 2001, Besio 2001, Besio and Tarjan 2002a were performed.…”

Section: Introductionmentioning

confidence: 99%

Tripolar Laplacian electrocardiogram and moment of activation isochronal mapping

Besio

Chen

2007

Physiol. Meas.

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The electrocardiogram (ECG) provides useful global temporal assessment of the cardiac activity, but has limited spatial capabilities. The Laplacian electrocardiogram (LECG), an improvement over the ECG, provides high spatiotemporal distributed information about cardiac electrical activation. We designed and developed LECG tripolar concentric ring electrode active sensors based on the finite element algorithm 'nine-point method' (NPM). The active sensors were used in an array of 6 by 12 (72) locations to record bipolar and tripolar LECG from the body surface over the anterolateral chest. Compared to bipolar LECG, tripolar LECG showed significantly higher spatial selectivity which may be helpful in inferring information about cardiac activations detected on the body surface. In this study the moment of activation (MOA), an indicator of a depolarization wave passing below the active sensors, was used to surmise possible timing information of the cardiac electrical activation below the active sensors' recording sites. The MOA on the body surface was used to generate isochronal maps that may some day be used by clinicians in diagnosing arrhythmias and assessing the efficacy of therapies.

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Section: Introductionmentioning

confidence: 99%

Tripolar Laplacian electrocardiogram and moment of activation isochronal mapping

Besio

Chen

2007

Physiol. Meas.

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Characterization of laplacian surface electromyographic signals during isometric contraction in biceps brachii

Estrada

Torres

Garcia-Casado³

et al. 2013

2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

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Surface electromyography (sEMG) is a noninvasive technique for monitoring the electrical activity produced by the muscles. Usually, sEMG is performed by carrying out monopolar or bipolar recordings by means of conventional Ag/AgCl electrodes. In contrast, Laplacian recordings of sEMG could also be obtained by using coaxial ring electrodes. Laplacian recordings increase spatial resolution and attenuate other distant bioelectric interferences. Nevertheless, the spectral characteristics of this kind of recordings have been scarcely studied. The objective of this paper is to characterize the sEMG signals recorded with a Laplacian ring electrode and to compare them with traditional bipolar recordings with disc electrodes. Both kinds of signals were collected simultaneously in two healthy subjects during resting and sustained isometric voluntary contraction activities in biceps brachii. The conducted study computed the cumulative percentage of the power spectrum of sEMG so as to determine the energy bandwidth of the two kinds of recordings and the signal to noise ratio in different bands of the sEMG spectrum. Also, muscle fatigue, a condition when muscle force is reduced, was assessed using indexes from amplitude and frequency domain. The results of this study suggest that Laplacian sEMG has higher spectral bandwidth but a lower signal to noise ratio in comparison to bipolar sEMG. In addition, frequency fatigue indexes showed that Laplacian recording had better response than bipolar recording, which suggests that Laplacian electrode can be useful to study muscular fatigue due to better spatial resolution.

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Non-invasive Laplacian Electrocardiography and Moment of Activation Mapping

Cited by 2 publications

References 10 publications

Tripolar Laplacian electrocardiogram and moment of activation isochronal mapping

Tripolar Laplacian electrocardiogram and moment of activation isochronal mapping

Characterization of laplacian surface electromyographic signals during isometric contraction in biceps brachii

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