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Does cardiovascular autonomic dysfunction contribute to fatigue in Parkinson's disease?
Tomohiko Nakamura1, Masaaki Hirayama, Takashi Hara
1Department of Neurology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
Summary
Fatigue in Parkinson's disease is linked to autonomic dysfunction, specifically cardiac sympathetic denervation. This study found impaired autonomic function and reduced cardiac (123)I-metaiodobenzylguanidine uptake in fatigued Parkinson's patients.
Area of Science:
- Neurology
- Cardiology
- Autonomic Neuroscience
Background:
- Fatigue is a common symptom in Parkinson's disease (PD).
- Cardiac sympathetic denervation is suspected to contribute to fatigue in PD, but the association remains unclear.
- Previous research identified cardiac sympathetic denervation in PD patients using dobutamine.
Purpose of the Study:
- To investigate the relationship between autonomic dysfunction and fatigue in Parkinson's disease patients.
- To clarify the role of autonomic dysfunction, including cardiac sympathetic denervation, in PD-related fatigue.
Main Methods:
- Autonomic function tests were performed on 33 PD patients, divided into fatigued (n=12) and non-fatigued (n=21) groups.
- Tests included R-R interval variability, head-up tilt test, norepinephrine and dobutamine infusion tests, and cardiac (123)I-metaiodobenzylguanidine scintigraphy.
- Correlations between fatigue scores and autonomic function/scintigraphy results were analyzed, controlling for disease duration and severity.
Main Results:
- Fatigued PD patients showed significantly greater pressor responses during norepinephrine and dobutamine infusions compared to non-fatigued patients.
- The (123)I-metaiodobenzylguanidine heart-to-mediastinal uptake ratio was significantly lower in the fatigued group.
- Autonomic dysfunction, including cardiac sympathetic denervation, correlated significantly with fatigue severity in PD.
Conclusions:
- Autonomic dysfunction, particularly cardiac sympathetic denervation, is associated with fatigue in Parkinson's disease.
- These findings highlight the importance of assessing autonomic function in PD patients experiencing fatigue.
- Targeting autonomic dysfunction may offer new therapeutic strategies for managing fatigue in PD.
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