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
1986
Assessment of alexithymia in posttraumatic stress disorder and somatic illness: introduction of a reliable measure.
Krystal JH, Giller EL, Cicchetti DV. Assessment of alexithymia in posttraumatic stress disorder and somatic illness: introduction of a reliable measure. Psychosomatic Medicine 1986, 48: 84-94. PMID: 3945719, DOI: 10.1097/00006842-198601000-00007.Peer-Reviewed Original ResearchConceptsPosttraumatic stress disorderBeth Israel Psychosomatic QuestionnaireSomatic illnessStress disorderOutpatient treatmentAffective patientsAffective disordersPsychiatric inpatientsPatientsSchalling-Sifneos ScaleComparison groupAssessment of alexithymiaMedical servicesInterrater reliabilityPsychosomatic researchVietnam veteransDisordersSimilar degreeInpatientsGreater degreePsychosomatic QuestionnaireIllnessMMPI subscalesSomatic groupsReliable measure