2024
Development of a prediction model for 30-day COVID-19 hospitalization and death in a national cohort of Veterans Health Administration patients–March 2022—April 2023
Bui D, Bajema K, Huang Y, Yan L, Li Y, Rajeevan N, Berry K, Rowneki M, Argraves S, Hynes D, Huang G, Aslan M, Ioannou G. Development of a prediction model for 30-day COVID-19 hospitalization and death in a national cohort of Veterans Health Administration patients–March 2022—April 2023. PLOS ONE 2024, 19: e0307235. PMID: 39365775, PMCID: PMC11451987, DOI: 10.1371/journal.pone.0307235.Peer-Reviewed Original ResearchConceptsVeterans Health AdministrationCOVID-19 hospitalizationArea under the receiver operating characteristic curveComprehensive electronic health recordNational cohortElectronic health recordsAll-cause mortalityNational cohort of patientsFull modelHealth recordsHealth AdministrationReceipt of COVID-19 vaccineMortality riskEpidemiology of COVID-19COVID-19High-risk patientsBrier scoreCohort of patientsAnti-SARS-CoV-2 treatmentCOVID-19 vaccineReceiver operating characteristic curveCalibration interceptHospitalAntiviral treatmentAvailability of effective vaccines
2021
Polygenic Breast Cancer Risk for Women Veterans in the Million Veteran Program
Minnier J, Rajeevan N, Gao L, Park B, Pyarajan S, Spellman P, Haskell SG, Brandt CA, Luoh SW. Polygenic Breast Cancer Risk for Women Veterans in the Million Veteran Program. JCO Precision Oncology 2021, 5: 1178-1191. PMID: 34381935, PMCID: PMC8345920, DOI: 10.1200/po.20.00541.Peer-Reviewed Original ResearchConceptsBreast Cancer Risk Assessment ToolCancer Risk Assessment ToolIncident breast cancerAbsolute lifetime riskAA womenRisk assessment toolIncident casesLifetime riskBreast cancerMillion Veteran ProgramAccurate breast cancer risk assessmentProstate Cancer Cohort ConsortiumBreast cancer risk assessmentPrior BC diagnosisBreast cancer riskClinical risk modelVeteran ProgramRisk prediction modelCancer risk assessmentAssessment toolIncident BCAfrican ancestryHazard ratioProspective cohortMultiracial cohort
2020
Genome-Wide Association Studies of Schizophrenia and Bipolar Disorder in a Diverse Cohort of US Veterans
Bigdeli TB, Fanous AH, Li Y, Rajeevan N, Sayward F, Genovese G, Gupta R, Radhakrishnan K, Malhotra AK, Sun N, Lu Q, Hu Y, Li B, Chen Q, Mane S, Miller P, Cheung KH, Gur RE, Greenwood TA, Braff DL, on the Genetics of Schizophrenia C, Achtyes ED, Buckley PF, Escamilla MA, Lehrer D, Malaspina DP, McCarroll SA, Rapaport MH, Vawter P, Pato MT, Pato CN, Investigators G, Zhao H, Kosten TR, Brophy M, Pyarajan S, Shi Y, O’Leary T, Gleason T, Przygodzki R, Muralidhar S, Gaziano JM, Program M, Huang GD, Concato J, Siever LJ, Aslan M, Harvey PD. Genome-Wide Association Studies of Schizophrenia and Bipolar Disorder in a Diverse Cohort of US Veterans. Schizophrenia Bulletin 2020, 47: 517-529. PMID: 33169155, PMCID: PMC7965063, DOI: 10.1093/schbul/sbaa133.Peer-Reviewed Original Research
2019
Genome‐wide association study of cognitive performance in U.S. veterans with schizophrenia or bipolar disorder
Harvey PD, Sun N, Bigdeli TB, Fanous AH, Aslan M, Malhotra AK, Lu Q, Hu Y, Li B, Chen Q, Mane S, Miller P, Rajeevan N, Sayward F, Cheung K, Li Y, Greenwood TA, Gur RE, Braff DL, on the Genetics of Schizophrenia C, Brophy M, Pyarajan S, O'Leary TJ, Gleason T, Przygodszki R, Muralidhar S, Gaziano JM, Concato J, Zhao H, Siever LJ. Genome‐wide association study of cognitive performance in U.S. veterans with schizophrenia or bipolar disorder. American Journal Of Medical Genetics Part B Neuropsychiatric Genetics 2019, 183: 181-194. PMID: 31872970, DOI: 10.1002/ajmg.b.32775.Peer-Reviewed Original ResearchMeSH KeywordsAdultAgedAllelesBipolar DisorderCognitionCognition DisordersFemaleGenome-Wide Association StudyGenotypeHumansMaleMiddle AgedNeuropsychological TestsOligonucleotide Array Sequence AnalysisPolymorphism, Single NucleotideSchizophreniaUnited StatesUnited States Department of Veterans AffairsVeteransGenome-wide association study of post-traumatic stress disorder reexperiencing symptoms in >165,000 US veterans
Gelernter J, Sun N, Polimanti R, Pietrzak R, Levey DF, Bryois J, Lu Q, Hu Y, Li B, Radhakrishnan K, Aslan M, Cheung KH, Li Y, Rajeevan N, Sayward F, Harrington K, Chen Q, Cho K, Pyarajan S, Sullivan PF, Quaden R, Shi Y, Hunter-Zinck H, Gaziano JM, Concato J, Zhao H, Stein MB. Genome-wide association study of post-traumatic stress disorder reexperiencing symptoms in >165,000 US veterans. Nature Neuroscience 2019, 22: 1394-1401. PMID: 31358989, PMCID: PMC6953633, DOI: 10.1038/s41593-019-0447-7.Peer-Reviewed Original ResearchConceptsGenome-wide association studiesAssociation studiesHigh linkage disequilibrium regionLinkage disequilibrium regionWide association studyDisequilibrium regionBioinformatics analysisTranscriptomic profilesMillion Veteran ProgramChromosome 17Genetic risk factorsNew insightsUK Biobank dataReexperiencing of traumaStriatal medium spiny neuronsVeteran ProgramSignificant regionsCAMKVEuropean AmericansBiobank dataMedium spiny neuronsTCF4BiologyKANSL1African American cohortGenome-wide Association Study of Maximum Habitual Alcohol Intake in >140,000 U.S. European and African American Veterans Yields Novel Risk Loci
Gelernter J, Sun N, Polimanti R, Pietrzak RH, Levey DF, Lu Q, Hu Y, Li B, Radhakrishnan K, Aslan M, Cheung KH, Li Y, Rajeevan N, Sayward F, Harrington K, Chen Q, Cho K, Honerlaw J, Pyarajan S, Lencz T, Quaden R, Shi Y, Hunter-Zinck H, Gaziano JM, Kranzler HR, Concato J, Zhao H, Stein MB, Program D, Program M. Genome-wide Association Study of Maximum Habitual Alcohol Intake in >140,000 U.S. European and African American Veterans Yields Novel Risk Loci. Biological Psychiatry 2019, 86: 365-376. PMID: 31151762, PMCID: PMC6919570, DOI: 10.1016/j.biopsych.2019.03.984.Peer-Reviewed Original ResearchConceptsAdditional genome-wide significant lociRisk lociWide association study (GWAS) analysisAssociation studiesGenome-wide significant lociGenome-wide association studiesGenetic correlationsWide association studyNovel risk lociAlcohol-related traitsStrong statistical supportSmoking-related traitsAdditional genomesSignificant lociPancreatic delta cellsChromosome 4Chromosome 11Protein productsChromosome 8Quantitative phenotypesMillion Veteran ProgramVeterans Affairs Million Veteran ProgramLociCell typesChromosome 17
2010
Testing Predictions From Personality Neuroscience
DeYoung CG, Hirsh JB, Shane MS, Papademetris X, Rajeevan N, Gray JR. Testing Predictions From Personality Neuroscience. Psychological Science 2010, 21: 820-828. PMID: 20435951, PMCID: PMC3049165, DOI: 10.1177/0956797610370159.Peer-Reviewed Original ResearchConceptsPersonality neuroscienceBrain regionsLateral prefrontal cortexMedial orbitofrontal cortexBig Five personalityStructural magnetic resonance imagingNegative affectReward informationMental statesOrbitofrontal cortexPrefrontal cortexBig FiveDifferent brain regionsVoluntary controlExplanatory modelsWhole brain volumeConscientiousnessNeuroscienceExtraversionAgreeablenessNeuroticismHealthy adultsBiological basisCortexMagnetic resonance imaging
2009
Variation in orbitofrontal cortex volume: relation to sex, emotion regulation and affect
Welborn BL, Papademetris X, Reis DL, Rajeevan N, Bloise SM, Gray JR. Variation in orbitofrontal cortex volume: relation to sex, emotion regulation and affect. Social Cognitive And Affective Neuroscience 2009, 4: 328-339. PMID: 20019072, PMCID: PMC2799952, DOI: 10.1093/scan/nsp028.Peer-Reviewed Original ResearchConceptsAffective individual differencesEmotion regulationIndividual differencesSelf-reported emotion regulation strategiesVmPFC volumeSex differencesEmotion regulation strategiesOrbitofrontal Cortex SubregionsHealthy right-handed adultsVentromedial prefrontal cortexBrain structuresRight-handed adultsEmotion suppressionPositive emotionsBrain volumeRegulation strategiesSomatic anxietyEmotional impulsesOrbitofrontal cortex structurePrefrontal cortexPlanum temporaleLateral orbitofrontalRight lateral orbitofrontalCortex volumeCortex structureArterial transit time effects in pulsed arterial spin labeling CBF mapping: Insight from a PET and MR study in normal human subjects
Qiu M, Maguire R, Arora J, Planeta‐Wilson B, Weinzimmer D, Wang J, Wang Y, Kim H, Rajeevan N, Huang Y, Carson RE, Constable RT. Arterial transit time effects in pulsed arterial spin labeling CBF mapping: Insight from a PET and MR study in normal human subjects. Magnetic Resonance In Medicine 2009, 63: 374-384. PMID: 19953506, PMCID: PMC2867043, DOI: 10.1002/mrm.22218.Peer-Reviewed Original ResearchFunctional connectivity and alterations in baseline brain state in humans
Martuzzi R, Ramani R, Qiu M, Rajeevan N, Constable RT. Functional connectivity and alterations in baseline brain state in humans. NeuroImage 2009, 49: 823-834. PMID: 19631277, PMCID: PMC2764802, DOI: 10.1016/j.neuroimage.2009.07.028.Peer-Reviewed Original ResearchConceptsDefault mode networkMAC sevoflurane anesthesiaBaseline brain activityFunctional connectivity fMRISevoflurane anesthesiaHigher-order brain regionsAnesthetized conditionSensory cortexDifferent brain networksBaseline activityBrain regionsHuman volunteersSensory areasFunctional connectivityAnesthesiaMode networkLow-level sensory areasBrain networksBrain activityCognitive regionsBrain propertiesBrain statesFurther evidencePainThalamus
2008
Anesthetic effects on regional CBF, BOLD, and the coupling between task‐induced changes in CBF and BOLD: An fMRI study in normal human subjects
Qiu M, Ramani R, Swetye M, Rajeevan N, Constable RT. Anesthetic effects on regional CBF, BOLD, and the coupling between task‐induced changes in CBF and BOLD: An fMRI study in normal human subjects. Magnetic Resonance In Medicine 2008, 60: 987-996. PMID: 18816821, PMCID: PMC2716171, DOI: 10.1002/mrm.21759.Peer-Reviewed Original ResearchConceptsCerebral blood flowLow-dose sevofluraneRegional cerebral blood flowTask-induced changesBaseline cerebral blood flowBlood oxygen level-dependent (BOLD) signalAbsence of anesthesiaHealthy human subjectsHuman subjectsNormal human subjectsLevel-dependent signalFunctional MR imagingVascular measuresAnesthetic agentsBlood flowAnesthetic effectSevofluraneFunctional MRI dataAnesthesia conditionsAnesthesiaMR imagingAuditory regionsOxidative metabolismAuditory stimuliFMRI studySensory and cognitive mechanisms of change detection in the context of speech
Laufer I, Negishi M, Rajeevan N, Lacadie CM, Constable RT. Sensory and cognitive mechanisms of change detection in the context of speech. Brain Structure And Function 2008, 212: 427-442. PMID: 18193453, PMCID: PMC2248604, DOI: 10.1007/s00429-007-0167-8.Peer-Reviewed Original Research
2000
Test-retest reproducibility of extrastriatal dopamine D2 receptor imaging with [123I]epidepride SPECT in humans.
Varrone A, Fujita M, Verhoeff NP, Zoghbi SS, Baldwin RM, Rajeevan N, Charney DS, Seibyl JP, Innis RB. Test-retest reproducibility of extrastriatal dopamine D2 receptor imaging with [123I]epidepride SPECT in humans. Journal Of Nuclear Medicine 2000, 41: 1343-51. PMID: 10945525.Peer-Reviewed Original ResearchConceptsTest-retest variabilityTemporal cortexTest-retest reproducibilityOutcome measuresExtrastriatal regionsD2 receptorsPlasma clearanceExtrastriatal dopamine D2 receptorsGood test-retest variabilityConstant infusion paradigmExtrastriatal D2 receptorsDopamine D2 receptorsBrain radioactivityStriatal radioactivityHealthy volunteersReceptor densityInfusion rateParent tracerSPECT studiesLess test-retest variabilityCortexHigh test-retest variabilityFree fractionReceptor quantificationReceptors
1999
Graphical analysis and simplified quantification of striatal and extrastriatal dopamine D2 receptor binding with [123I]epidepride SPECT.
Ichise M, Fujita M, Seibyl JP, Verhoeff NP, Baldwin RM, Zoghbi SS, Rajeevan N, Charney DS, Innis RB. Graphical analysis and simplified quantification of striatal and extrastriatal dopamine D2 receptor binding with [123I]epidepride SPECT. Journal Of Nuclear Medicine 1999, 40: 1902-12. PMID: 10565788.Peer-Reviewed Original ResearchConceptsSignificant intersubject variabilityD2 receptorsBlood dataDistribution volumeExtrastriatal dopamine D2 receptorsIntersubject variabilityExtrastriatal D2 receptorsDopamine D2 receptorsSingle blood samplingReceptor-containing regionsNondisplaceable compartmentNondisplaceable distribution volumeHealthy volunteersBlood samplingD2 bindingSPECT studiesTissue ratioPlasma samplesPresence of metabolitesMultilinear regression analysisRegression analysisStriatalReceptorsMetabolite activityLipophilic metabolitesKinetic and equilibrium analyses of [123I]epidepride binding to striatal and extrastriatal dopamine D2 receptors
Fujita M, Seibyl J, Verhoeff N, Ichise M, Baldwin R, Zoghbi S, Burger C, Staley J, Rajeevan N, Charney D, Innis R. Kinetic and equilibrium analyses of [123I]epidepride binding to striatal and extrastriatal dopamine D2 receptors. Synapse 1999, 34: 290-304. PMID: 10529723, DOI: 10.1002/(sici)1098-2396(19991215)34:4<290::aid-syn5>3.0.co;2-b.Peer-Reviewed Original Research[123I]Iomazenil SPECT benzodiazepine receptor imaging in schizophrenia
Verhoeff N, Soares J, D’Souza C, Gil R, Degen K, Abi-Dargham A, Zoghbi S, Fujita M, Rajeevan N, Seibyl J, Krystal J, van Dyck C, Charney D, Innis R. [123I]Iomazenil SPECT benzodiazepine receptor imaging in schizophrenia. Psychiatry Research 1999, 91: 163-173. PMID: 10641580, DOI: 10.1016/s0925-4927(99)00027-x.Peer-Reviewed Original ResearchConceptsDuration of illnessHealthy control subjectsControl subjectsGamma-aminobutyric acidLeft precentral gyrusSuperior occipital gyrusPANSS scoresPrecentral gyrusOccipital gyrusSignificant differencesTotal brain uptakeNon-smoking patientsGray matter atrophyConstant infusion paradigmPathophysiology of schizophreniaCortical brain regionsSingle photon emissionTypical antipsychoticsAtypical antipsychoticsCigarette smokingInhibitory neurotransmissionBrain uptakeInfusion paradigmMatter atrophyPostmortem studiesEffects of Vigabatrin on the GABAergic System as Determined by [123I]Iomazenil SPECT and GABA MRS
Verhoeff N, Petroff O, Hyder F, Zoghbi S, Fujita M, Rajeevan N, Rothman D, Seibyl J, Mattson R, Innis R. Effects of Vigabatrin on the GABAergic System as Determined by [123I]Iomazenil SPECT and GABA MRS. Epilepsia 1999, 40: 1433-1438. PMID: 10528940, DOI: 10.1111/j.1528-1157.1999.tb02016.x.Peer-Reviewed Original ResearchConceptsEffects of vigabatrinGABA levelsTissue GABA levelsMR imagingCentral gamma-aminobutyric acidGABA magnetic resonance spectroscopyDistribution volumeHealthy age-matched controlsOccipital GABA levelsAge-matched controlsGamma-aminobutyric acidVolume of interestSingle photon emissionMagnetic resonance spectroscopyTotal plasma activityT1-weighted MR imagingPartial seizuresGABAergic systemOccipital cortexConstant infusion methodPlasma activityVigabatrinOccipital activityEffective doseWilcoxon testChanges of benzodiazepine receptors during chronic benzodiazepine administration in humans
Fujita M, Woods S, Verhoeff N, Abi-Dargham A, Baldwin R, Zoghbi S, Soares J, Jatlow P, Krystal J, Rajeevan N, Charney D, Seibyl J, Innis R. Changes of benzodiazepine receptors during chronic benzodiazepine administration in humans. European Journal Of Pharmacology 1999, 368: 161-172. PMID: 10193652, DOI: 10.1016/s0014-2999(99)00013-8.Peer-Reviewed Original ResearchConceptsClinical effectsReceptor levelsReceptor densityReceptor occupancyChronic benzodiazepine administrationBenzodiazepine receptor densityHealthy human subjectsComparison of baselineSingle photon emissionHopkins Verbal Learning TestInduced sedationVerbal Learning TestBenzodiazepine administrationOral administrationBaseline valuesBenzodiazepine receptorsTolerance developmentDay 3Day 17Day 4Day 10Central typeLearning TestReceptorsHuman subjects
1998
Alterations of Benzodiazepine Receptors in Type II Alcoholic Subjects Measured With SPECT and 123IIomazenil
Abi-Dargham A, Krystal JH, Anjilvel S, Scanley BE, Zoghbi S, Baldwin RM, Rajeevan N, Ellis S, Petrakis IL, Seibyl JP, Charney DS, Laruelle M, Innis RB. Alterations of Benzodiazepine Receptors in Type II Alcoholic Subjects Measured With SPECT and 123IIomazenil. American Journal Of Psychiatry 1998, 155: 1550-1555. PMID: 9812116, DOI: 10.1176/ajp.155.11.1550.Peer-Reviewed Original ResearchConceptsHealthy comparison subjectsBenzodiazepine receptorsComparison subjectsAlcoholic subjectsDistribution volumeAlcoholic patientsAnterior cingulateBenzodiazepine receptor densityRight middle frontal gyrusLeft occipital cortexType II alcoholismSingle photon emissionMiddle frontal gyrusStatistical parametric mappingContinuous infusionReceptor radiotracerReceptor densityOccipital cortexCerebellar cortexCortical regionsPatientsFrontal gyrusInterest analysisVivo studiesParametric mappingSignificance of nonuniform attenuation correction in quantitative brain SPECT imaging.
Rajeevan N, Zubal IG, Ramsby SQ, Zoghbi SS, Seibyl J, Innis RB. Significance of nonuniform attenuation correction in quantitative brain SPECT imaging. Journal Of Nuclear Medicine 1998, 39: 1719-26. PMID: 9776276.Peer-Reviewed Original ResearchConceptsHealthy control subjectsHealthy human control subjectsHuman control subjectsControl subjectsDisease patientsGroup of patientsParkinson's disease patientsNonuniform attenuation correctionOutcome measuresParkinson's diseaseSPECT scansBrain SPECTBrain regionsDopamine transporterPatientsBackground activity ratioNonuniform attenuation mapGold standardModerate improvementScansBrain ROIsSPECT imagesAttenuation correctionDiseaseQuantitative brain SPECT