Sudden cardiac death in synucleinopathies

Area of Science:

• Neuropathology
• Cardiology
• Neurodegenerative Diseases

Background:

• α-synucleinopathies (ASs) are a group of neurodegenerative diseases characterized by the accumulation of α-synuclein protein.
• Cardiac involvement in ASs is increasingly recognized, but the direct impact on cause of death requires further investigation.

Purpose of the Study:

• To determine the cause of death in patients with ASs and cardiac α-synuclein (α-syn) presence.
• To compare mortality profiles between AS patients with cardiac α-syn and control groups with other neurocognitive disorders.

Main Methods:

• Retrospective analysis of neuropathologically confirmed cases (78 AS with cardiac α-syn, 53 controls).
• Review of autopsy reports and medical records for cause of death, cardiac pathology, and cardiovascular disease.
• Statistical comparison of sudden cardiac death (SCD) prevalence between groups.

Main Results:

• Sudden cardiac death (SCD) was significantly more prevalent in the AS group (51.3%) compared to controls (22.6%, p < 0.001).
• No significant differences were found in other cardiac conditions or cardio- and cerebrovascular diseases between the groups.
• SCD was the leading cause of death in the AS cohort.

Conclusions:

• Cardiac α-syn deposits are strongly associated with sudden cardiac death in patients with α-synucleinopathies.
• These findings suggest that cardiac α-syn may induce lethal cardiac arrhythmias.
• Further research is warranted to explore the mechanisms linking cardiac α-syn to fatal cardiac events.