Brain perfusion differences in parkinsonian disorders

Area of Science:

• Neuroscience
• Radiology
• Neurology

Background:

• Parkinsonian disorders, including Parkinson's disease (PD), multiple system atrophy (MSA), and progressive supranuclear palsy (PSP), present overlapping clinical symptoms, complicating differential diagnosis.
• Objective assessment of brain perfusion is crucial for distinguishing these neurodegenerative conditions.

Purpose of the Study:

• To investigate and compare regional cerebral blood flow (rCBF) patterns using SPECT in patients with PD, MSA-Parkinsonian variant, and PSP, alongside healthy controls.
• To identify specific perfusion deficits indicative of each disease entity and assess their diagnostic utility.

Main Methods:

• (99m)Tc ethylcysteinate dimer SPECT imaging was conducted on 28 PD patients, 12 MSA-P patients, 19 PSP patients, and 17 age- and sex-matched controls.
• Voxel-by-voxel group analysis using statistical parametric mapping 8 and the noninvasive Patlak plot method with automated region of interest analysis were employed to quantify rCBF.

Main Results:

• Progressive supranuclear palsy (PSP) demonstrated reduced rCBF in the cingulate gyrus and thalamus.
• Parkinson variant of multiple system atrophy (MSA-P) showed decreased rCBF in the cerebellum.
• Regional cerebral blood flow in the thalamus effectively discriminated PSP from other groups with high sensitivity.

Conclusions:

• Parkinsonian disorders exhibit distinct SPECT perfusion patterns in the frontal cortex, thalamus, and cerebellum.
• Measurements of rCBF in the thalamus and cerebellum are valuable tools for the differential diagnosis of parkinsonian syndromes, aiding in accurate patient stratification.