Pre- and postsynaptic dopamine SPECT in the early phase of idiopathic parkinsonism: a population-based study

  • Susanna Jakobson Mo
  • Jan Linder
  • Lars Forsgren
  • Anne Larsson
  • Lennart Johansson
  • Katrine Riklund
Original Article



The aim of this study was to assess the diagnostic contribution of pre- and postsynaptic dopamine SPECT in drug-naïve patients with early idiopathic parkinsonism and to investigate possible differences between idiopathic Parkinson’s disease (PD) and atypical parkinsonian syndromes (APS) and possible differences in motor subtypes of parkinsonism.


A group of 128 newly diagnosed idiopathic parkinsonian patients and 48 healthy controls was studied. Presynaptic baseline SPECT with 123I-FP-CIT was performed in all patients and in 120 patients also a baseline postsynaptic SPECT with 123I-IBZM. Clinical diagnoses were reassessed after 12 months.


Presynaptic uptake in the putamen and caudate was significantly reduced in patients compared to controls. Presynaptic uptake ratios were not different between PD patients and patients with APS, and postsynaptic uptake in APS was not significantly reduced compared to PD or controls. In half of the APS patients both pre- and postsynaptic uptake ratios were reduced on the same side in the striatum. Impaired motor performance was associated with decreased presynaptic uptake in the putamen in PD. The postural instability and gait difficulty (PIGD) subtype of PD had lower presynaptic uptake ratios than patients with tremor-dominated (TD) symptoms.


Not only presynaptic putamen uptake ratios, but also caudate ratios were reduced in a majority of the patients in our study. At baseline scan, i.e. in an early stage of the disease, the accuracy of excluding APS in the whole study population was 85% using a combination of pre- and postsynaptic SPECT. Already at baseline, lower presynaptic SPECT ratios were seen in PD with PIGD at onset compared to those with TD subtype.


Parkinson’s disease Parkinsonian syndromes 123I-IBZM 123I-FP-CIT SPECT 


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Susanna Jakobson Mo
    • 1
  • Jan Linder
    • 3
  • Lars Forsgren
    • 3
  • Anne Larsson
    • 2
  • Lennart Johansson
    • 2
  • Katrine Riklund
    • 1
  1. 1.Department of Radiation Sciences, Diagnostic RadiologyUmeå UniversityUmeåSweden
  2. 2.Department of Radiation Sciences, Radiation PhysicsUmeå UniversityUmeåSweden
  3. 3.Department of Pharmacology and Clinical Neuroscience, NeurologyUmeå UniversityUmeåSweden

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