Impaired default mode network on resting-state fMRI in children with medically refractory epilepsy

E. Widjaja*, M. Zamyadi, C. Raybaud, O. C. Snead, M. L. Smith

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

BACKGROUND AND PURPOSE: Resting-state networks including the DMN have been shownto be abnormalinadults with temporal lobe epilepsy. However, little is known about the DMN in children with medically refractory epilepsy. The aim was to determine whether there was a difference in the DMN in children with medically refractory epilepsy relative to controls. MATERIALS AND METHODS: Eleven children with medically refractory epilepsy and 11 age-matched healthy controls underwent resting-state fMRI. IC analysis was used to identify the DMN. A random-effects analysis was performed on the Z-maps of the DMN within each group and between groups. We calculated the temporal correlation coefficients of pairs of ROIs: PCC/PCUN, mPFC, and left and right lateral parietal cortices. The relations between z scores oftemporal correlation coefficients of pairs of ROIs and clinical seizure parameters and IQ were assessed. RESULTS: The patients demonstrated decreased DMN connectivity in the PCC/PCUN, bilateral lateral parietal cortex, and anterior and midcingulate relative to controls. There was reduced connectivity between the mPFC-right lateral parietal cortex, the PCC/PCUN-left lateral parietal cortex, and the PCC/PCUN-right lateral parietal cortex pairs of ROIs in patients compared with controls. There were no significant correlations between the z scores of temporal correlation coefficients of the6 pairs of ROIs in patients and ageofseizure onset, duration of epilepsy, number of medications, seizure frequency, and IQ. CONCLUSIONS: We have found reduced connectivity in the DMN in children with medically refractory epilepsy. Further studies are needed to determine whether different seizure types have different effects on the DMN and whether the impaired connectivity is related to cognitive functions subserved by the DMN.

Original languageEnglish (US)
Pages (from-to)552-557
Number of pages6
JournalAmerican Journal of Neuroradiology
Volume34
Issue number3
DOIs
StatePublished - Mar 2013

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Clinical Neurology

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