2020
Mapping of subthalamic nucleus using microelectrode recordings during deep brain stimulation
Koirala N, Serrano L, Paschen S, Falk D, Anwar A, Kuravi P, Deuschl G, Groppa S, Muthuraman M. Mapping of subthalamic nucleus using microelectrode recordings during deep brain stimulation. Scientific Reports 2020, 10: 19241. PMID: 33159098, PMCID: PMC7648837, DOI: 10.1038/s41598-020-74196-5.Peer-Reviewed Original ResearchConceptsMicroelectrode recordingsBackground activityStereotactic magnetic resonance imagingLow beta frequency rangeDeep brain stimulation surgeryBilateral STN-DBSSide effect ratioDeep brain stimulationBeta frequency rangeMagnetic resonance imagingSTN-DBSAwake patientsLead placementSubthalamic nucleusIntraoperative decisionAnatomical sitesBrain stimulationDBS electrodesOptimal target localizationResonance imagingMaximum spike rateBeta rangeSpike ratePatientsImplantationCross-frequency coupling between gamma oscillations and deep brain stimulation frequency in Parkinson’s disease
Muthuraman M, Bange M, Koirala N, Ciolac D, Pintea B, Glaser M, Tinkhauser G, Brown P, Deuschl G, Groppa S. Cross-frequency coupling between gamma oscillations and deep brain stimulation frequency in Parkinson’s disease. Brain 2020, 143: 3393-3407. PMID: 33150359, PMCID: PMC7116448, DOI: 10.1093/brain/awaa297.Peer-Reviewed Original ResearchConceptsDeep brain stimulationBrain stimulationParkinson's diseaseStimulation frequencyCross-frequency couplingMotor symptomsSubthalamic nucleusGamma oscillationsDeep Brain Stimulation FrequencyOscillatory activityPhysiological neural activityMotor function recoveryEffective deep brain stimulationHigh-frequency stimulationPathological oscillatory activityCross-frequency interactionsCortico-subcortical networksDifferent oscillatory activitiesSymptom controlParietal cortex regionsClinical effectsFunction recoverySymptom alleviationMotor impairmentSubcortical regions
2019
Selective Brain Network and Cellular Responses Upon Dimethyl Fumarate Immunomodulation in Multiple Sclerosis
Ciolac D, Luessi F, Gonzalez-Escamilla G, Koirala N, Riedel C, Fleischer V, Bittner S, Krämer J, Meuth S, Muthuraman M, Groppa S. Selective Brain Network and Cellular Responses Upon Dimethyl Fumarate Immunomodulation in Multiple Sclerosis. Frontiers In Immunology 2019, 10: 1779. PMID: 31417557, PMCID: PMC6682686, DOI: 10.3389/fimmu.2019.01779.Peer-Reviewed Original ResearchConceptsCortical atrophyDisease activityMultiple sclerosisDMF groupDeep GM volumesDimethyl fumarate treatmentT-cell depletionDisease-modifying drugsWhite matter damageImmune cell dynamicsDMF therapyNAT patientsStrong CD8Lymphocyte subsetsDisease durationDisease courseMS patientsCell depletionMatter damageLess atrophyFumarate treatmentTreatment paradigmBrain network responsesLesion volumeTherapy response
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
2017
Frontal Lobe Connectivity and Network Community Characteristics are Associated with the Outcome of Subthalamic Nucleus Deep Brain Stimulation in Patients with Parkinson’s Disease
Koirala N, Fleischer V, Glaser M, Zeuner K, Deuschl G, Volkmann J, Muthuraman M, Groppa S. Frontal Lobe Connectivity and Network Community Characteristics are Associated with the Outcome of Subthalamic Nucleus Deep Brain Stimulation in Patients with Parkinson’s Disease. Brain Topography 2017, 31: 311-321. PMID: 28986718, DOI: 10.1007/s10548-017-0597-4.Peer-Reviewed Original ResearchConceptsDeep brain stimulationDiffusion-weighted imagingPostoperative clinical outcomesClinical responseParkinson's diseaseSTN-DBSClinical outcomesSubthalamic nucleusBrain stimulationSubthalamic nucleus deep brain stimulationNon-motor symptomsOptimal clinical responseConnectivity profilesPre-intervention predictorsEvidence-based stateIndependent predictorsPD patientsTherapy optionsClinical effectivenessCingulate gyrusFrontal lobe connectivityCerebral regionsT MRI scannerCerebral networksPrefrontal cortexEffects of DBS in parkinsonian patients depend on the structural integrity of frontal cortex
Muthuraman M, Deuschl G, Koirala N, Riedel C, Volkmann J, Groppa S. Effects of DBS in parkinsonian patients depend on the structural integrity of frontal cortex. Scientific Reports 2017, 7: 43571. PMID: 28262813, PMCID: PMC5337928, DOI: 10.1038/srep43571.Peer-Reviewed Original ResearchConceptsSTN-DBSParkinson's diseaseCortical thickness measurementsGray matter integrityClinical responseCortical atrophyMotor outcomePoor motor outcomeOptimal clinical responseIdiopathic Parkinson's diseaseDeep brain stimulationEffects of DBSGray matter propertiesClinical motor outcomePreoperative conditionClinical improvementClinical outcomesParkinsonian patientsPD patientsStandard treatmentDBS treatmentSubthalamic nucleusFrontal cortexCortical thicknessBrain stimulation
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 therapyNetwork Effects and Pathways in Deep Brain Stimulation in Parkinson's Disease**Koirala N, Fleischer V, Muthuraman M, Groppa S, are with the Johannes Gutenberg university hospital, 55131, Mainz and Granert O, Deuschl G is with University clinic Schleswig-Holstein, 24105, Kiel, Germany;
Koirala N, Fleischer V, Granert O, Deuschl G, Muthuraman M, Groppa S. Network Effects and Pathways in Deep Brain Stimulation in Parkinson's Disease**Koirala N, Fleischer V, Muthuraman M, Groppa S, are with the Johannes Gutenberg university hospital, 55131, Mainz and Granert O, Deuschl G is with University clinic Schleswig-Holstein, 24105, Kiel, Germany;. Annual International Conference Of The IEEE Engineering In Medicine And Biology Society (EMBC) 2016, 2016: 5533-5536. PMID: 28269510, DOI: 10.1109/embc.2016.7591980.Peer-Reviewed Original ResearchConceptsSupplementary motor areaDeep brain stimulationSTN-DBSParkinson's diseaseDiffusion tensor imagingBrain stimulationProbabilistic tractographyActive DBS contactsPostoperative clinical outcomesPrimary motor cortexStandard therapeutic optionIdiopathic Parkinson's diseaseCortico-spinal tractSubcortical seedsClinical outcomesTherapeutic optionsDBS contactsMotor cortexDBS treatmentUniversity HospitalSubthalamic nucleusMotor areaPremotor regionsStimulation siteTensor imaging