2024
Diffusion‐Weighted Imaging Fluid‐Attenuated Inversion Recovery Mismatch on Portable, Low‐Field Magnetic Resonance Imaging Among Acute Stroke Patients
Sorby‐Adams A, Guo J, de Havenon A, Payabvash S, Sze G, Pinter N, Jaikumar V, Siddiqui A, Baldassano S, Garcia‐Guarniz A, Zabinska J, Lalwani D, Peasley E, Goldstein J, Nelson O, Schaefer P, Wira C, Pitts J, Lee V, Muir K, Nimjee S, Kirsch J, Iglesias J, Rosen M, Sheth K, Kimberly W. Diffusion‐Weighted Imaging Fluid‐Attenuated Inversion Recovery Mismatch on Portable, Low‐Field Magnetic Resonance Imaging Among Acute Stroke Patients. Annals Of Neurology 2024, 96: 321-331. PMID: 38738750, PMCID: PMC11293843, DOI: 10.1002/ana.26954.Peer-Reviewed Original ResearchStroke patientsAcute ischemic strokeCut-pointsIschemic strokeStroke patients <Diagnosis of acute ischemic strokeSignal intensity ratioFluid-attenuated inversion recoveryAcute stroke patientsOptimal cut-pointMagnetic resonance imagingDiffusion-weighted imagingDWI-FLAIR mismatchStroke onsetTrained assessorsNational InstituteStrokeThrombolytic interventionNegative predictive valueFLAIR hyperintensitiesPatientsInterobserver agreementHyperacute strokeDiffusion-weightedPredictive value
2015
Detection of Intraparenchymal Hemorrhage After Endovascular Therapy in Patients with Acute Ischemic Stroke Using Immediate Postprocedural Flat‐Panel Computed Tomography Scan
Payabvash S, Khan AA, Qureshi MH, Saeed O, Suri MF, Qureshi AI. Detection of Intraparenchymal Hemorrhage After Endovascular Therapy in Patients with Acute Ischemic Stroke Using Immediate Postprocedural Flat‐Panel Computed Tomography Scan. Journal Of Neuroimaging 2015, 26: 213-218. PMID: 26282065, DOI: 10.1111/jon.12277.Peer-Reviewed Original ResearchConceptsMultidetector CT studiesNegative predictive valueIschemic stroke patientsIntraparenchymal hemorrhageCT scanEndovascular treatmentHyperdense lesionParenchymal lesionsStroke patientsPredictive valueCT studiesMultidetector CTAcute ischemic stroke patientsAcute ischemic strokeAcute stroke patientsMultidetector CT scanPositive predictive valueEndovascular therapyIschemic strokePost procedureTomography scanSeparate cohortSuch lesionsPatientsDiagnostic value
2013
Admission Insular Infarction >25% Is the Strongest Predictor of Large Mismatch Loss in Proximal Middle Cerebral Artery Stroke
Kamalian S, Kemmling A, Borgie RC, Morais LT, Payabvash S, Franceschi AM, Kamalian S, Yoo AJ, Furie KL, Lev MH. Admission Insular Infarction >25% Is the Strongest Predictor of Large Mismatch Loss in Proximal Middle Cerebral Artery Stroke. Stroke 2013, 44: 3084-3089. PMID: 23988643, PMCID: PMC3894265, DOI: 10.1161/strokeaha.113.002260.Peer-Reviewed Original ResearchConceptsInfarct volumeInsular infarctionHealth Stroke Scale scoreMiddle cerebral artery infarctConsecutive acute stroke patientsMiddle cerebral artery strokeProximal middle cerebral arteryRapid reperfusion therapyTreatment-eligible patientsAcute stroke patientsStroke Scale scoreFinal infarct volumeMiddle cerebral arteryStrongest predictorCharacteristic curve areaExcellent interobserver agreementDiffusion-weighted imaging imagesBinary logistic regressionArtery infarctInfarct progressionOcclusive strokePenumbral tissueReperfusion therapyCollateral scoreIndependent predictorsHospital Acquired Pneumonia Is Linked to Right Hemispheric Peri-Insular Stroke
Kemmling A, Lev MH, Payabvash S, Betensky RA, Qian J, Masrur S, Schwamm LH. Hospital Acquired Pneumonia Is Linked to Right Hemispheric Peri-Insular Stroke. PLOS ONE 2013, 8: e71141. PMID: 23951094, PMCID: PMC3737185, DOI: 10.1371/journal.pone.0071141.Peer-Reviewed Original ResearchConceptsHemispheric infarctsBrain regionsConsecutive acute stroke patientsConditional logistic regression modelsHospital-Acquired PneumoniaRight hemispheric infarctAcute stroke patientsInsular cortex volumeVolume-based variablesSpecific brain regionsLogistic regression modelsAcquired PneumoniaControl patientsMajor complicationsBrainstem strokeImmune suppressionInfarct sizeStroke patientsAutonomic modulationClinical variablesAdmission imagingInfarct locationUnivariate analysisImmune mechanismsCortex volume
2012
Location-weighted CTP analysis predicts early motor improvement in stroke
Payabvash S, Souza LC, Kamalian S, Wang Y, Passanese J, Kamalian S, Fung SH, Halpern EF, Schaefer PW, Gonzalez RG, Furie KL, Lev MH. Location-weighted CTP analysis predicts early motor improvement in stroke. Neurology 2012, 78: 1853-1859. PMID: 22573641, PMCID: PMC3369521, DOI: 10.1212/wnl.0b013e318258f799.Peer-Reviewed Original ResearchConceptsAcute stroke patientsAdmission NIHSSMotor improvementStroke patientsCT perfusionPredictive valueOnly independent clinical predictorMultivariate binary logistic regressionFrontal lobe white matterMultivariate modelIndependent clinical predictorsMotor functional improvementMotor function improvementNegative predictive valuePositive predictive valueSuperior temporal gyrusBinary logistic regressionExtremity paresisAcute strokeSymptom onsetClinical predictorsConsecutive patientsIndependent predictorsClinical outcomesImaging predictors
2011
CT Perfusion Mean Transit Time Maps Optimally Distinguish Benign Oligemia from True “At-Risk” Ischemic Penumbra, but Thresholds Vary by Postprocessing Technique
Kamalian S, Kamalian S, Konstas AA, Maas MB, Payabvash S, Pomerantz SR, Schaefer PW, Furie KL, González RG, Lev MH. CT Perfusion Mean Transit Time Maps Optimally Distinguish Benign Oligemia from True “At-Risk” Ischemic Penumbra, but Thresholds Vary by Postprocessing Technique. American Journal Of Neuroradiology 2011, 33: 545-549. PMID: 22194372, PMCID: PMC3746025, DOI: 10.3174/ajnr.a2809.Peer-Reviewed Original ResearchConceptsAcute stroke patientsLarge vessel occlusionBenign oligemiaStroke patientsIschemic penumbraCTP parametersRelative cerebral blood flowConsecutive stroke patientsHours of onsetCerebral blood flowMean transit time mapsCharacteristic curve analysisTransit time mapsUninvolved hemisphereRadiographic evidenceThrombolytic therapyFinal infarctVessel occlusionRelative MTTBlood flowCTP mapsPerfusion parametersOligemiaReperfusionPatientsRegional Ischemic Vulnerability of the Brain to Hypoperfusion
Payabvash S, Souza LC, Wang Y, Schaefer PW, Furie KL, Halpern EF, Gonzalez RG, Lev MH. Regional Ischemic Vulnerability of the Brain to Hypoperfusion. Stroke 2011, 42: 1255-1260. PMID: 21493917, PMCID: PMC3090217, DOI: 10.1161/strokeaha.110.600940.Peer-Reviewed Original ResearchConceptsIschemic vulnerabilityStroke patientsInfarct coreRCBF thresholdAdmission diffusion-weighted imagingCerebral blood flow reductionAcute stroke patientsIschemic stroke onsetBlood flow reductionAdmission CT perfusionDiffusion-weighted imagingCT perfusion mapsStroke onsetRCBF reductionCT perfusionBrain lesionsInferior frontal gyrusParacentral lobuleCaudate bodyInsular ribbonPerfusion parameter mapsHypoperfusionSubcortical regionsPatientsRCBF
2010
Predicting Language Improvement in Acute Stroke Patients Presenting with Aphasia: A Multivariate Logistic Model Using Location-Weighted Atlas-Based Analysis of Admission CT Perfusion Scans
Payabvash S, Kamalian S, Fung S, Wang Y, Passanese J, Kamalian S, Souza LC, Kemmling A, Harris GJ, Halpern EF, González RG, Furie KL, Lev MH. Predicting Language Improvement in Acute Stroke Patients Presenting with Aphasia: A Multivariate Logistic Model Using Location-Weighted Atlas-Based Analysis of Admission CT Perfusion Scans. American Journal Of Neuroradiology 2010, 31: 1661-1668. PMID: 20488905, PMCID: PMC3640318, DOI: 10.3174/ajnr.a2125.Peer-Reviewed Original ResearchMeSH KeywordsAlgorithmsAphasiaBrainComputer SimulationFemaleHumansLogistic ModelsMaleModels, NeurologicalMultivariate AnalysisPattern Recognition, AutomatedPerfusion ImagingPrognosisRadiographic Image Interpretation, Computer-AssistedReproducibility of ResultsSensitivity and SpecificityStrokeSubtraction TechniqueTomography, X-Ray ComputedConceptsBrain CTPNIHSS scoreStroke onsetFunctional outcomeFirst-time ischemic strokeProximal cerebral artery occlusionMultiple logistic regression analysisMultivariate logistic regression modelMultivariate modelDischarge NIHSS scoreTotal NIHSS scoreAcute stroke patientsCerebral artery occlusionTime of dischargeCT perfusion imagingLogistic regression analysisMultivariate logistic modelCT perfusion scansLogistic regression modelsAdmission CTAArtery occlusionInfarct volumeIschemic strokeClinical predictorsConsecutive patients