The Pattern of Striatal Dopamine Depletion as a Prognostic Marker in De Novo Parkinson Disease
Abstract
To investigate whether the patterns of striatal dopamine depletion could provide prognostic information on the clinical profiles of early-stage Parkinson disease (PD). Approximately 634 patients with drug-naive PD who underwent F-FP-CIT PET scans were followed up for at least 2 years. After quantifying dopamine transporter (DAT) availability in each striatal subregion, the patterns of striatal dopamine depletion of each patient were assessed based on (1) the degree of dopamine loss in the other striatal subregions compared to the posterior putamen (inter-subregional ratio [ISR]) and (2) the interhemispheric asymmetry of dopamine loss in the posterior putamen (asymmetry index [AI]). According to their patterns, we assessed the longitudinal changes in L-dopa-equivalent doses and L-dopa-induced dyskinesia (LID)-free times using the linear mixed model and Cox regression model, respectively. There was no significant correlation between the ISR and AI values (Pearson correlation coefficient, 0.150). The linear mixed model showed that higher AI values were associated with slower longitudinal increases in L-dopa-equivalent dose across time (P = 0.003), whereas ISR values were not (P = 0.154). The Cox regression model demonstrated that ...Continue Reading
References
Dopamine released from 5-HT terminals is the cause of L-DOPA-induced dyskinesia in parkinsonian rats
(123) I]FP-CIT-SPECT asymmetry index to differentiate Parkinson's disease from vascular parkinsonism
Citations
Clinical and Dopamine Depletion Patterns in Hyposmia- and Dysautonomia-Dominant Parkinson's Disease.
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