PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 8295437

Electrogastrogram simulation using a three-dimensional model.

B Kothapalli
View original source ↗Export metadata ↓

Abstract

The recording of gastric electrical activity using cutaneous electrodes is known as electrogastrography, and the recorded electrogastrogram comprises the electrical control activity and the contraction-related electrical response activity. The electrogastrogram has been simulated using a three-dimensional model that takes the effect of inhomogeneities into consideration. The model reproduces the electrical control activity and the second component of the electrical response activity. Spike activity is not reproduced. The increase in amplitude towards the antrum and the phase coupling between various regions is reflected in the simulated electrogastrogram. There is a possibility of determining the velocity of propagation from the phase difference with electrodes located above the antrum.

Explore related subjects

ElectrodesElectrophysiologyHumansMembrane PotentialsModels, BiologicalStomachJournal Article

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

B Kothapalli. 1993. Electrogastrogram simulation using a three-dimensional model.. https://doi.org/10.1007/bf02441983

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed1996

The start-stop-start phenomenon in scalp-sphenoidal ictal recordings.

The start-stop-start (SSS) phenomenon is an apparent abortive ictal onset separated from the main seizure discharge. It was previously described in seizures recorded with subdural electrodes. We have observed this phenomenon in scalp-sphenoidal ictal recordings as well. We retrospectively reviewed 435 seizures recorded with scalp-sphenoidal electrodes from 61 patients with temporal lobe epilepsy. We found SSS onset in 15 seizures of 8 patients, representing 26% of these patients' seizures. The first "start" usually had a narrow field, typically in the sphenoidal electrode. The mean duration of the first "start" was 11 sec and that of the stop 8 sec. The restart had a different morphology and frequency in 87% and had a wider field in 67% of seizures. The clinical onset followed the first start and preceded the restart in most of the seizures. In 1 patient, 1 seizure with SSS was correctly localized and lateralized, whereas 5 of 7 without SSS were falsely lateralized. The recognition of the SSS phenomenon may improve the accuracy of seizure localization in scalp-sphenoidal recordings.

Electrodes↗
PubMed1996

Event-related coherence as a tool for studying dynamic interaction of brain regions.

This paper demonstrates a simple approach to calculating time courses of coherence for data recorded during an event-related paradigm. Event-related coherence (ERCoh) was investigated between left and right sensorimotor areas, and between contralateral sensorimotor and SMA during discrete right index finger movements. It is demonstrated that ERCoh can provide information regarding the dynamic interaction of spatially separated brain regions. In the upper alpha band, the mu rhythm of the contralateral sensorimotor area is shown to be linearly phase-coupled to rhythmic activity recorded over the SMA. This synchrony between the rhythms decreases during planning and execution of movement when the respective areas become active. In the gamma band, a short-lasting increase in coherence is found between the contralateral sensorimotor area and the SMA prior to movement, indicating possible functional interaction of these areas during the final stages of movement preparation.

Electrodes↗
PubMed1996

Comparison of coronal sphenoidal versus standard anteroposterior temporal montage in the EEG recording of temporal lobe seizures.

Chronic sphenoidal electrodes were developed to facilitate the recording and localization of temporal lobe seizures during long term monitoring. Many reports demonstrate their utility in displaying temporal interictal epileptiform activity, but there have been few direct comparisons of sphenoidal electrodes and surface temporal recordings actually. We compared simultaneous portions of 74 EEG recordings of temporal lobe seizures (from 42 patients), with one portion including sphenoidal electrodes in a coronal montage and one with a standard anterior posterior temporal montage. Separated tracings were reviewed by readers blinded to the other portion of the tracing. The coronal sphenoidal montage allowed recognition of temporal lobe seizures inapparent with standard surface temporal electrodes in 19% of seizures and led to an earlier identification (usually by > or = 5 s) of the onset in 70% of seizures. Indwelling, flexible sphenoidal electrodes assist in ambulatory recording of temporal lobe seizures, both in demonstrating the presence of seizures and in determining the localization and time of seizure onset.

Electrodes↗