Extensive Delayed Brain Atrophy after Resuscitation in a Patient with Multiple System Atrophy

Area of Science:

• Neurology
• Neuroimaging
• Pathology

Background:

• Multiple system atrophy (MSA) is a neurodegenerative disorder characterized by brain atrophy visible on MRI, particularly in the cerebrum, cerebellum, and brainstem.
• Hypoxic encephalopathy, often resulting from cardiac arrest, also causes brain atrophy, primarily affecting gray matter and cerebral cortex.

Observation:

• This report details a patient who experienced an 18-minute cardiac arrest, leading to hypoxic insult.
• Following resuscitation, the patient developed severe, widespread brain atrophy within 10 months.
• The observed atrophy pattern in both white and gray matter resembled that typically seen in MSA.

Findings:

• The patient's brain atrophy after hypoxic insult mirrored the characteristic patterns of multiple system atrophy.
• Alpha-synuclein oligomerization is hypothesized to contribute to neural cell death and exacerbate brain atrophy in hypoxic injury.
• The prion-like behavior of misfolded alpha-synuclein may explain the extensive pathological changes observed.

Implications:

• Alpha-synuclein's role in MSA pathogenesis suggests it could be a target for understanding and potentially treating neurodegeneration after hypoxic events.
• This case highlights the potential for alpha-synuclein to mediate secondary neurodegeneration in the context of global brain injury.
• Further research into alpha-synuclein propagation could offer insights into managing brain atrophy following cardiac arrest and other hypoxic insults.