OBJECTIVE: Drug-induced psychosis is a frequent side-effect in the treatment of advanced Parkinson's disease (PD). We sought to develop and evaluate a brief instrument for early recognition of drug-induced psychosis in PD. METHODS: We developed the "Parkinson Psychosis Questionnaire" (PPQ), which consists of screening questions for typical early signs and psychotic symptoms in PD and which quantifies the frequency and severity of four clinical categories-sleep disturbances, hallucinations/illusions, delusions and orientation. We performed an internal validation of the PPQ in 50 unselected patients with parkinsonism. The Brief Psychiatric Rating Scale (BPRS) and the "Structurized Clinical Interview" (SCID) for DSM IV were applied to the same patients as external references. RESULTS: Of 50 subjects, 49 suffered from idiopathic PD and one from probable MSA-P. Hoehn and Yahr stages in "on" ranged from 1.5 to 4. Sensitivity of the PPQ test for drug-induced psychosis according to SCID was 100 % (95 % CI: 73.5%, 100%); while specificity was 92.1 % (95% CI: 78.6%, 98.3 %). The PPQ severity score was highly correlated with BPRS. We derived a linear prediction formula, which transformed PPQ into BPRS scores. CONCLUSION: The PPQ appears to be a suitable, and easily administered instrument for early diagnosis of drug induced psychosis in routine PD care. Whether the PPQ could also be a valuable tool for monitoring follow-up studies and therapeutic intervention trials remains to be tested.
OBJECTIVE: Drug-induced psychosis is a frequent side-effect in the treatment of advanced Parkinson's disease (PD). We sought to develop and evaluate a brief instrument for early recognition of drug-induced psychosis in PD. METHODS: We developed the "Parkinson Psychosis Questionnaire" (PPQ), which consists of screening questions for typical early signs and psychotic symptoms in PD and which quantifies the frequency and severity of four clinical categories-sleep disturbances, hallucinations/illusions, delusions and orientation. We performed an internal validation of the PPQ in 50 unselected patients with parkinsonism. The Brief Psychiatric Rating Scale (BPRS) and the "Structurized Clinical Interview" (SCID) for DSM IV were applied to the same patients as external references. RESULTS: Of 50 subjects, 49 suffered from idiopathic PD and one from probable MSA-P. Hoehn and Yahr stages in "on" ranged from 1.5 to 4. Sensitivity of the PPQ test for drug-induced psychosis according to SCID was 100 % (95 % CI: 73.5%, 100%); while specificity was 92.1 % (95% CI: 78.6%, 98.3 %). The PPQ severity score was highly correlated with BPRS. We derived a linear prediction formula, which transformed PPQ into BPRS scores. CONCLUSION: The PPQ appears to be a suitable, and easily administered instrument for early diagnosis of drug induced psychosis in routine PD care. Whether the PPQ could also be a valuable tool for monitoring follow-up studies and therapeutic intervention trials remains to be tested.
Authors: Jared T Hinkle; Kate Perepezko; Catherine C Bakker; Ted M Dawson; Vanessa Johnson; Zoltan Mari; Cherie L Marvel; Kelly A Mills; Alexander Pantelyat; Olga Pletnikova; Liana S Rosenthal; Melissa D Shepard; Daniel A Stevens; Juan C Troncoso; Jiangxia Wang; Gregory M Pontone Journal: Int J Geriatr Psychiatry Date: 2017-05-16 Impact factor: 3.485
Authors: Kelsey A Holiday; Eva Pirogovsky-Turk; Vanessa L Malcarne; J Vincent Filoteo; Irene Litvan; Stephanie L Lessig; David Song; Dawn M Schiehser Journal: Mov Disord Clin Pract Date: 2017-03-16
Authors: James M Shine; Joanna M Z Mills; Jessica Qiu; Claire O'Callaghan; Zoe Terpening; Glenda M Halliday; Sharon L Naismith; Simon J G Lewis Journal: Mov Disord Clin Pract Date: 2015-03-16
Authors: Alana J Muller; Joanna M Z Mills; Claire O'Callaghan; Sharon L Naismith; Paul D Clouston; Simon J G Lewis; James M Shine Journal: Mov Disord Clin Pract Date: 2018-11-08