2019
Interictal Hyperperfusion in the Higher Visual Cortex in Patients With Episodic Migraine
Michels L, Villanueva J, O’Gorman R, Muthuraman M, Koirala N, Büchler R, Gantenbein A, Sandor P, Luechinger R, Kollias S, Riederer F. Interictal Hyperperfusion in the Higher Visual Cortex in Patients With Episodic Migraine. Headache The Journal Of Head And Face Pain 2019, 59: 1808-1820. PMID: 31680242, DOI: 10.1111/head.13646.Peer-Reviewed Original ResearchConceptsCerebral blood flowCohen's d effect sizesEpisodic migraineD effect sizesHealthy controlsSuperior temporal gyrusASL-MRIVisual cortexInterictal cerebral blood flowInterictal stateTemporal gyrusHigher-order visual cortexNeuro-functional abnormalitiesEffect sizeFunctional brain imaging studiesNon-invasive imaging methodMagnetic resonance imagingHigher visual cortexBrain imaging studiesInterictal hyperperfusionCBF changesSubcortical alterationsMigraine pathophysiologyParietal operculumBlood flowAlterations in White Matter Network and Microstructural Integrity Differentiate Parkinson’s Disease Patients and Healthy Subjects
Koirala N, Anwar A, Ciolac D, Glaser M, Pintea B, Deuschl G, Muthuraman M, Groppa S. Alterations in White Matter Network and Microstructural Integrity Differentiate Parkinson’s Disease Patients and Healthy Subjects. Frontiers In Aging Neuroscience 2019, 11: 191. PMID: 31404311, PMCID: PMC6676803, DOI: 10.3389/fnagi.2019.00191.Peer-Reviewed Original ResearchPD patientsHealthy subject groupParkinson's diseaseNetwork-based statisticsDisease patientsHealthy controlsHealthy subjectsWhite matterMiddle-aged healthy controlsNetwork alterationsProbabilistic tractography analysisParkinson's disease patientsWhite matter changesSubject groupsWhite matter microstructural integrityElderly healthy controlsDistinct brain areasPD pathophysiologyWhite matter networksCorticospinal tractCorpus callosumCorona radiataMatter changesPatientsBrain areasLarge-scale network architecture and associated structural cortico-subcortical abnormalities in patients with sleep/awake-related seizures
Chiosa V, Ciolac D, Groppa S, Koirala N, Pintea B, Vataman A, Winter Y, Gonzalez-Escamilla G, Muthuraman M, Groppa S. Large-scale network architecture and associated structural cortico-subcortical abnormalities in patients with sleep/awake-related seizures. Sleep 2019, 42: zsz006. PMID: 30753617, DOI: 10.1093/sleep/zsz006.Peer-Reviewed Original ResearchConceptsAwake seizuresSleep seizuresHealthy controlsAwake stateSex-matched healthy controlsRight middle temporal cortexDifferent epilepsy typesVolume of hippocampusBrain networksMiddle temporal cortexEpilepsy typePathophysiological alterationsSubcortical abnormalitiesPatientsTemporal cortexSeizuresSubcortical regionsSuperior temporalBilateral insulaOrbitofrontal cortexSleepParietal regionsAbnormalitiesRight hemisphereStructural correlatesLongitudinal cortical network reorganization in early relapsing–remitting multiple sclerosis
Fleischer V, Koirala N, Droby A, Gracien R, Deichmann R, Ziemann U, Meuth S, Muthuraman M, Zipp F, Groppa S. Longitudinal cortical network reorganization in early relapsing–remitting multiple sclerosis. Therapeutic Advances In Neurological Disorders 2019, 12: 1756286419838673. PMID: 31040880, PMCID: PMC6482642, DOI: 10.1177/1756286419838673.Peer-Reviewed Original ResearchRelapsing-remitting MSEarly relapsing-remitting MSHealthy controlsDisease activityEarly relapsing-remitting multiple sclerosisLongitudinal brain volume changesRelapsing-remitting multiple sclerosisCortical atrophy patternsStructural cortical networksPatients' disease activityNetwork reorganizationBrain volume changesClinical disease manifestationsDetectable atrophyMultiple sclerosisAtrophy patternsDisease manifestationsAtrophy measurementsCortical responsesGray matter networksBrain functionPatientsT MRICortical networksGraph theoretical analysisStructural brain network fingerprints of focal dystonia
Chirumamilla V, Dresel C, Koirala N, Gonzalez-Escamilla G, Deuschl G, Zeuner K, Muthuraman M, Groppa S. Structural brain network fingerprints of focal dystonia. Therapeutic Advances In Neurological Disorders 2019, 12: 1756286419880664. PMID: 31798688, PMCID: PMC6859688, DOI: 10.1177/1756286419880664.Peer-Reviewed Original ResearchBSP patientsHFS patientsBoNT treatmentHealthy controlsFocal dystoniaHemifacial spasmSensorimotor cortexFrontal cortexTemporal cortexStructural magnetic resonance imagingReduced connectivityGray matter volumeDifferent brain regionsSymptomatic reductionMovement disordersStructural brain networksGraph-based network analysisPatientsMatter volumeBlepharospasmDystoniaParietal cortexResonance imagingBrain regionsDecreased connectivity
2018
Cerebello-cortical network fingerprints differ between essential, Parkinson’s and mimicked tremors
Muthuraman M, Raethjen J, Koirala N, Anwar A, Mideksa K, Elble R, Groppa S, Deuschl G. Cerebello-cortical network fingerprints differ between essential, Parkinson’s and mimicked tremors. Brain 2018, 141: 1770-1781. PMID: 29701820, DOI: 10.1093/brain/awy098.Peer-Reviewed Original ResearchConceptsEssential tremorSensorimotor cortexCerebral cortexHealthy controlsPremotor cortexParkinson's diseaseVoluntary rhythmic movementsPrimary sensorimotor cortexSex-matched groupPrimary sensorimotor regionsEEG-EMG coherenceMotor performance measuresParkinson's tremorEMG oscillationsCortical efferentsSensorimotor regionsCerebellar involvementTremor severityFunctional MRICortexCerebellumDiseaseAdditional studiesTremorMulti-channel EMG
2016
Grey Matter Microstructural Integrity Alterations in Blepharospasm Are Partially Reversed by Botulinum Neurotoxin Therapy
Alexandru H, Muthuraman M, Chirumamilla V, Koirala N, Paktas B, Deuschl G, Zeuner K, Groppa S. Grey Matter Microstructural Integrity Alterations in Blepharospasm Are Partially Reversed by Botulinum Neurotoxin Therapy. PLOS ONE 2016, 11: e0168652. PMID: 27992533, PMCID: PMC5161386, DOI: 10.1371/journal.pone.0168652.Peer-Reviewed Original ResearchConceptsBenign essential blepharospasmHemifacial spasmBoNT therapyCortical thicknessBEB patientsHealthy controlsTemporal poleCommon hyperkinetic movement disordersStandard evidence-based treatmentGroup of patientsBotulinum neurotoxin therapyHyperkinetic movement disordersPrimary motor cortexDifferent pathophysiological mechanismsLower cortical thicknessEvidence-based treatmentsFacial musclesPre-supplementary motor areaRight superior frontal regionsGroup of ageLeft lingual gyrusSuperior frontal regionsGray matter integrityContrary patientsNeurotoxin therapyIncreased structural white and grey matter network connectivity compensates for functional decline in early multiple sclerosis
Fleischer V, Gröger A, Koirala N, Droby A, Muthuraman M, Kolber P, Reuter E, Meuth S, Zipp F, Groppa S. Increased structural white and grey matter network connectivity compensates for functional decline in early multiple sclerosis. Multiple Sclerosis Journal 2016, 23: 432-441. PMID: 27246143, DOI: 10.1177/1352458516651503.Peer-Reviewed Original ResearchConceptsMultiple sclerosisCentral nervous systemMagnetic resonance imagingWhite matterClinical declineClinical impairmentRelapsing-remitting MS patientsEarly multiple sclerosisVoxel-based morphometryTemporo-parietal regionsNeuronal injuryConnectivity patternsMS patientsRemission phaseDisease stageDisease onsetHealthy controlsFunctional declineNervous systemGray matter networksResonance imagingProbabilistic tractographySclerosisStructural connectivityDisease