Abstract
Purpose
We hypothesized that combining pre- and postsynaptic quantitative information about the dopaminergic system would provide a higher diagnostic accuracy in the differential diagnosis of parkinsonism than specific striatal D2 receptor binding alone. Therefore, the aim of the study was to introduce new semi-quantitative parameters and evaluate their ability to discriminate between Parkinson’s disease (IPS) and non-idiopathic parkinsonian syndromes (non-IPS).
Methods
In 100 patients (69 IPS, 31 non-IPS), postsynaptic [123I]IBZM and presynaptic [123I]FP-CIT SPECT scans were evaluated by observer-independent techniques. The diagnostic performances of striatal dopamine transporter (DAT) and D2 receptor binding, their respective asymmetries, and a combination of pre- and postsynaptic asymmetry were evaluated with ROC analyses. A logistic regression model was generated combining factors to calculate the probability for each patient of belonging to either diagnostic group.
Results
D2 receptor binding provided a sensitivity of 87.1% and a specificity of 72.5% with an area under the curve (AUC) of 0.866. The AUCs of other single parameters were lower than that of D2 binding. A gain of diagnostic power (p = 0.026) was reached with a model combining pre- and postsynaptic asymmetries and D2 binding (sensitivity 90.3%, specificity 73.9%, AUC 0.893).
Conclusion
The combination of quantitative parameters of presynaptic DAT and postsynaptic D2 receptor binding demonstrates superior diagnostic power in the differentiation of patients with IPS and non-IPS than the established approach based on D2 binding alone. Striatal D2 receptor binding and the combination of DAT and IBZM binding asymmetries are the factors contributing most in separating these diagnostic groups.
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Acknowledgement
P. Radau gratefully acknowledges financial support from Hermes Medical Solutions (Stockholm, Sweden).
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Koch, W., Hamann, C., Radau, P.E. et al. Does combined imaging of the pre- and postsynaptic dopaminergic system increase the diagnostic accuracy in the differential diagnosis of parkinsonism?. Eur J Nucl Med Mol Imaging 34, 1265–1273 (2007). https://doi.org/10.1007/s00259-007-0375-8
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DOI: https://doi.org/10.1007/s00259-007-0375-8