Autonomic dysfunction in presymptomatic spinocerebellar ataxia type-2

Area of Science:

• Neurology
• Cardiology
• Autonomic Nervous System

Background:

• Type 2 spinocerebellar ataxia (SCA2) is a neurodegenerative disorder.
• Presymptomatic stages of SCA2 may involve subclinical autonomic dysfunction.
• Early detection of autonomic abnormalities is crucial for patient management.

Purpose of the Study:

• To investigate and quantify cardiovascular autonomic regulation abnormalities in presymptomatic SCA2 (PS-SCA2).
• To compare autonomic function in PS-SCA2 patients with age- and sex-matched controls.

Main Methods:

• Analysis of heart rate variability (HRV) from 5-minute RR interval recordings.
• Standard autonomic function tests including resting, postural changes, Valsalva maneuver, and deep breathing.
• Comparison of HRV indices and autonomic test results between 48 PS-SCA2 patients and controls.

Main Results:

• Significant differences in time- and frequency-domain HRV indices were observed between PS-SCA2 and control groups.
• Cardiac autonomic neuropathy was identified in 8.33% (severe) and 16.66% (early) of PS-SCA2 subjects.
• CAG repeat expansion index showed significant correlations with age and heart rate.

Conclusions:

• The study confirms the presence of cardiovascular autonomic dysfunction in individuals with PS-SCA2.
• Autonomic abnormalities can be detected in the presymptomatic phase of SCA2.
• These findings highlight the importance of assessing autonomic function in early-stage SCA2.