Autonomic Changes in Juvenile-Onset Huntington's Disease

Area of Science:

• Neurology
• Autonomic Neuroscience
• Pediatric Neurology

Background:

• Adult-onset Huntington's Disease (AOHD) involves autonomic nervous system (ANS) dysfunction, linked to neurodegeneration and brain-heart axis disruption.
• This relationship remains unexplored in juvenile-onset Huntington's Disease (JOHD).

Purpose of the Study:

• To compare physiological autonomic measures between JOHD patients and controls.
• To investigate the impact of disease progression on these measures in JOHD.

Main Methods:

• Utilized data from the Kids-JOHD study, comparing JOHD patients (n=27) with gene-expansion-negative controls (GNE group, n=259).
• Measured resting heart rate (rHR), systolic blood pressure (SBP), and diastolic blood pressure (DBP).
• Employed linear mixed-effects models, controlling for covariates and accounting for participant/family clustering.

Main Results:

• JOHD patients exhibited significantly higher rHR compared to controls.
• JOHD patients showed significantly lower SBP than controls; DBP was also lower but not significant.
• SBP and DBP decreased with longer disease duration in JOHD, while rHR did not further increase.

Conclusions:

• Elevated rHR in early JOHD suggests central autonomic network neurodegeneration.
• Later decreases in SBP/DBP may indicate brainstem neurodegeneration (e.g., medulla).
• rHR appears more sensitive than blood pressure to early autonomic changes in JOHD.