Methods Inf Med - Quadratic Phase Couplings in the EEG of Premature and Full-term Newborn during Quiet Sleep.

Tópicos

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Resumo

TRODUCTION: This article is part of the Focus Theme of Methods of Information in Medicine on "Biosignal Interpretation: Advanced Methods for Neural Signals and Images".OBJECTIVES: The aim of this study was to compare rhythmicities in the quadratic phase coupling (QPC) in the trac? discontinue EEG patterns (TD) of premature newborns and the trac? alternant EEG patterns (TA) of full-term newborns by means of time-variant bispectral analysis. Both pattern occur during quiet sleep and are characterized by an ongoing sequence of interburst and burst patterns. The courses of time-variant bispectral measures during the EEG burst most likely indicate specific interrelations between cortical and thalamocortical brain structures.METHODS: The EEG of a group of premature (n = 5) and of full-term (n = 5) newborns was analysed. Time-variant QPC was investigated by means of time-variant parametric bispectral analysis. The frequency plain [0.5 Hz, 1.5 Hz] x [3 Hz, 6 Hz] was used as the region-of-interest (ROI).RESULTS: QPC rhythms with a frequency of 0.1 Hz (8 -11 s) were found in all full-term newborns at all electrodes. For the premature newborns the QPC rhythms were less stable and slower (< 0.1 Hz, 11- 17 s) at all electrodes and showed a higher inter-individual variation than for the full-term newborns. Statistically, the adaptation of a linear mixed model revealed a difference of about 5 s between both groups of newborns.CONCLUSIONS: The comparison of the results of both groups of newborns indicates a development in the interaction between cortical, thalamocortical and neurovegetative structures in the neonatal brain.

Resumo Limpo

troduct articl part focus theme method inform medicin biosign interpret advanc method neural signal imagesobject aim studi compar rhythmic quadrat phase coupl qpc trac discontinu eeg pattern td prematur newborn trac altern eeg pattern ta fullterm newborn mean timevari bispectr analysi pattern occur quiet sleep character ongo sequenc interburst burst pattern cours timevari bispectr measur eeg burst like indic specif interrel cortic thalamocort brain structuresmethod eeg group prematur n fullterm n newborn analys timevari qpc investig mean timevari parametr bispectr analysi frequenc plain hz hz x hz hz use regionofinterest roiresult qpc rhythm frequenc hz s found fullterm newborn electrod prematur newborn qpc rhythm less stabl slower hz s electrod show higher interindividu variat fullterm newborn statist adapt linear mix model reveal differ s group newbornsconclus comparison result group newborn indic develop interact cortic thalamocort neuroveget structur neonat brain

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