Differences in cerebellar perfusion between Parkinson's disease and multiple system atrophy

Area of Science:

• Neuroimaging
• Neurology
• Diagnostic Biomarkers

Background:

• Accurate differential diagnosis of Parkinson's disease (PD), multiple system atrophy (MSA), and progressive supranuclear palsy (PSP) requires objective biomarkers.
• Current diagnostic methods face challenges in distinguishing these neurodegenerative conditions.

Purpose of the Study:

• To evaluate the utility of cerebellar blood flow, assessed via N-isopropyl-[123I] p-iodoamphetamine single photon emission computed tomography (123I-IMP-SPECT), in differentiating between PD, MSA, and PSP.
• To determine if 123I-IMP-SPECT can serve as a diagnostic tool for these parkinsonian syndromes.

Main Methods:

• A cohort of patients diagnosed with PD, MSA with parkinsonian features (MSA-P), MSA with cerebellar ataxia (MSA-C), and PSP were included.
• Cerebellar perfusion was quantified using 123I-IMP-SPECT and analyzed with a 3D-stereotactic surface projection program.
• Data from 27 healthy controls were used for z-score calculations.

Main Results:

• Significantly decreased cerebellar perfusion was observed in both MSA-P and MSA-C groups when compared to PD and PSP groups (p < 0.001).
• No significant difference in cerebellar perfusion was found between the PD and PSP groups (p = 0.061).
• The area under the receiver operating characteristic curve for differentiating MSA-P from PD was 0.858.

Conclusions:

• Cerebellar perfusion imaging using 123I-IMP-SPECT demonstrates significant potential as a biomarker for distinguishing PD from MSA-P.
• This neuroimaging technique may aid in the early and accurate diagnosis of parkinsonian disorders.