Assessing whole brain perfusion changes in patients with REM sleep behavior disorder

Area of Science:

• Neuroscience
• Neurology
• Medical Imaging

Background:

• Idiopathic REM behavior disorder (RBD) is a neurodegenerative condition.
• Understanding the neurobiological underpinnings of RBD is crucial for early diagnosis and intervention.
• Cerebral perfusion patterns may reveal network alterations in RBD.

Purpose of the Study:

• To investigate regional cerebral perfusion in idiopathic RBD patients.
• To identify the specific brain networks affected by RBD.
• To establish the topographical distribution of perfusion abnormalities in RBD.

Main Methods:

• Cerebral blood flow was evaluated using (99m)Tc-Ethylene Cysteinate Dimer (ECD) SPECT.
• The study included eight patients with polysomnographically confirmed RBD and nine age-matched controls.
• Statistical Parametric Mapping (SPM2) was used for data analysis.

Main Results:

• Increased cerebral perfusion was observed in the pons and putamen bilaterally, and the right hippocampus.
• Decreased perfusion was noted in frontal cortical areas (Brodmann areas 4, 6, 10, 43, 44, 47 bilaterally; left BA 9, 46).
• Temporo-parietal cortical regions also showed decreased perfusion (BA 13, 22, 43 bilaterally; left BA 7, 19, 20, 21, 39, 40, 41, 42).

Conclusions:

• Perfusional abnormalities in RBD patients are localized to the brainstem, striatum, and cortex.
• These perfusion deficits align with the known anatomic and metabolic profile of Parkinson disease.
• The findings suggest a potential neurodegenerative pathway shared between RBD and Parkinson disease.