2014
Preliminary analysis of positive and negative syndrome scale in ketamine-associated psychosis in comparison with schizophrenia
Xu K, Krystal JH, Ning Y, Chen da C, He H, Wang D, Ke X, Zhang X, Ding Y, Liu Y, Gueorguieva R, Wang Z, Limoncelli D, Pietrzak RH, Petrakis IL, Zhang X, Fan N. Preliminary analysis of positive and negative syndrome scale in ketamine-associated psychosis in comparison with schizophrenia. Journal Of Psychiatric Research 2014, 61: 64-72. PMID: 25560772, PMCID: PMC4445679, DOI: 10.1016/j.jpsychires.2014.12.012.Peer-Reviewed Original ResearchConceptsKetamine groupNegative Syndrome ScaleSchizophrenia groupSyndrome ScaleN-methyl-D-aspartate (NMDA) glutamate receptor antagonistGlutamate receptor antagonistsPotential confounding factorsEarly course schizophreniaSymptom dimensionsSymptoms of schizophreniaReceptor antagonistChronic schizophreniaHealthy subjectsKetamine abuseSchizophrenia psychosisSchizophrenia patientsConfounding factorsSymptom severitySymptomsInpatientsSchizophreniaPsychosisKetamine usersDissociation symptomsPrincipal component factor analysis
2006
Enhanced Sensitivity to the Euphoric Effects of Alcohol in Schizophrenia
D'Souza DC, Gil RB, Madonick S, Perry EB, Forselius-Bielen K, Braley G, Donahue L, Tellioglu T, Zimolo Z, Gueorguieva R, Krystal JH. Enhanced Sensitivity to the Euphoric Effects of Alcohol in Schizophrenia. Neuropsychopharmacology 2006, 31: 2767-2775. PMID: 16985503, DOI: 10.1038/sj.npp.1301207.Peer-Reviewed Original ResearchConceptsEffects of alcoholHealthy subjectsBlood alcohol levelsPositive psychotic symptomsSmall transient increaseSelf-medication hypothesisPerceptual alterationsAlcohol administrationMotor functionAlcohol dosesElevated riskPsychotic symptomsLifetime exposureSchizophrenia patientsSchizophrenia symptomsEuphoric effectsNegative symptomsAlcohol levelsAlcohol useStimulatory effectSubjective effectsTransient increaseSchizophreniaStimulatory responseAlcohol responses
2005
Cortical Gamma-Aminobutyric Acid Levels and the Recovery from Ethanol Dependence: Preliminary Evidence of Modification by Cigarette Smoking
Mason GF, Petrakis IL, de Graaf RA, Gueorguieva R, Guidone E, Coric V, Epperson CN, Rothman DL, Krystal JH. Cortical Gamma-Aminobutyric Acid Levels and the Recovery from Ethanol Dependence: Preliminary Evidence of Modification by Cigarette Smoking. Biological Psychiatry 2005, 59: 85-93. PMID: 16289397, DOI: 10.1016/j.biopsych.2005.06.009.Peer-Reviewed Original ResearchConceptsEthanol-dependent patientsTobacco smokingEthanol dependenceHealthy subjectsN-acetylaspartateCortical gamma-aminobutyric acid (GABA) levelsGamma-aminobutyric acid (GABA) levelsCortical GABA levelsCortical GABA systemAlcohol withdrawal symptomsAcute ethanol withdrawalComorbidity of alcoholismProton magnetic resonance spectroscopyGamma-aminobutyric acidCortical GABASmoking patientsEthanol withdrawalCigarette smokingGABA systemHealthy menWithdrawal symptomsGABA levelsClinical dataNAA levelsWithdrawal severityDelta-9-tetrahydrocannabinol effects in schizophrenia: Implications for cognition, psychosis, and addiction
D’Souza D, Abi-Saab WM, Madonick S, Forselius-Bielen K, Doersch A, Braley G, Gueorguieva R, Cooper TB, Krystal JH. Delta-9-tetrahydrocannabinol effects in schizophrenia: Implications for cognition, psychosis, and addiction. Biological Psychiatry 2005, 57: 594-608. PMID: 15780846, DOI: 10.1016/j.biopsych.2004.12.006.Peer-Reviewed Original ResearchMeSH KeywordsAdultAkathisia, Drug-InducedArousalCognitionDose-Response Relationship, DrugDouble-Blind MethodDronabinolEndocrine SystemFemaleHumansInjections, IntravenousMaleMental RecallMiddle AgedMotor ActivityNeuropsychological TestsPerceptionPsychiatric Status Rating ScalesPsychotic DisordersPsychotropic DrugsSchizophreniaVerbal LearningConceptsSchizophrenia patientsAntipsychotic-treated schizophrenia patientsDelta-9-tetrahydrocannabinol effectsLong-term adverse eventsCognitive deficitsPlacebo-controlled studyDelta-9-THCTransient exacerbationAdverse eventsReceptor dysfunctionEndocrine effectsHealthy subjectsStudy participationPsychotic disordersPlasma prolactinSchizophrenia symptomsPatientsSchizophreniaCognitive effectsPerceptual alterationsDeficitsCannabisSubjectsAkathisiaExacerbation
2004
Impaired GABA Neuronal Response to Acute Benzodiazepine Administration in Panic Disorder
Goddard AW, Mason GF, Appel M, Rothman DL, Gueorguieva R, Behar KL, Krystal JH. Impaired GABA Neuronal Response to Acute Benzodiazepine Administration in Panic Disorder. American Journal Of Psychiatry 2004, 161: 2186-2193. PMID: 15569888, DOI: 10.1176/appi.ajp.161.12.2186.Peer-Reviewed Original ResearchConceptsGamma-aminobutyric acidPanic disorder patientsAcute benzodiazepine administrationCortical GABA levelsBenzodiazepine administrationGABA levelsPanic disorderDisorder patientsNeuronal responsesOccipital cortex GABA levelsTransmitter gamma-aminobutyric acidChronic benzodiazepine treatmentGABA neuronal functionHuman panic disorderTrait-like abnormalitiesGABA synthetic enzymeHealthy comparison subjectsStress-induced releaseCerebral cortexBenzodiazepine treatmentMedication administrationGABA responsesHealthy subjectsPathogenic factorsHuman anxiety disorders