Autonomic Dysfunction in Parkinsonian Syndromes

Autonomic dysfunction is a pervasive non-motor feature across Parkinson’s disease and related parkinsonian syndromes, encompassing cardiovascular, gastrointestinal, urinary, thermoregulatory and sudomotor disturbances. These manifestations often precede motor signs, offering potential for earlier diagnosis. Cardiovascular dysautonomia includes orthostatic hypotension, supine hypertension and impaired nocturnal blood pressure dipping, contributing to falls, syncope and increased morbidity. Gastrointestinal dysfunction—most notably constipation—may reflect α-synuclein deposition in enteric nerves, while urinary urgency and incontinence arise from bladder detrusor overactivity and pelvic autonomic failure. Thermoregulatory and sweat-related abnormalities further compromise quality of life. Underlying mechanisms involve both central autonomic network degeneration—affecting brainstem nuclei, hypothalamus and spinal autonomic centres—and peripheral small-fibre neuropathy. Quantitative measures such as heart rate variability and ambulatory blood pressure monitoring have refined understanding of dysautonomia severity and progression. Therapeutic strategies combine non-pharmacological measures (fluid and salt optimisation, compression garments, positional guidelines) with pharmacological agents (midodrine, fludrocortisone, droxidopa) tailored to individual symptom profiles. A clear appreciation of autonomic impairment is critical to holistic management and may inform future disease-modifying approaches.

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Autonomic Dysfunction in Parkinsonian Syndromes publication trend

The graph below shows the total number of articles in autonomic dysfunction in parkinsonian syndromes across all publications each year (not limited to Nature Index journals).

Technical terms

Orthostatic hypotension: A sustained drop in blood pressure upon standing, leading to lightheadedness, syncope and falls.

Heart rate variability (HRV): A measure of autonomic modulation of cardiac rhythm, reflecting sympathetic and parasympathetic balance.

Quantitative electroencephalography (qEEG): Rapid digital analysis of brainwave frequencies to assess cortical electrophysiology.

Glymphatic system: A perivascular network facilitating clearance of metabolic waste from the brain during sleep.

α-Synucleinopathy: A class of neurodegenerative diseases characterised by abnormal α-synuclein protein aggregation in the central and peripheral nervous systems.

References

1. Synchronous monitoring of brain‐heart electrophysiology using heart rate variability coupled with rapid quantitative electroencephalography in orthostatic hypotension patients with α‐synucleinopathies: Rapid prediction of orthostatic hypotension and preliminary exploration of brain stimulation therapy. CNS Neuroscience & Therapeutics (2024).
2. Altered sleep and neurovascular dysfunction in alpha-synucleinopathies: the perfect storm for glymphatic failure. Frontiers in Aging Neuroscience (2023).
3. Autonomic failure in Parkinson’s disease is associated with striatal dopamine deficiencies. Journal of Neurology (2020).
4. Autonomic Dysfunction in α-Synucleinopathies. Frontiers in Neurology (2019).
5. Twenty-Four Hour Non-Invasive Ambulatory Blood Pressure and Heart Rate Monitoring in Parkinson’s Disease. Frontiers in Neurology (2013).
6. Heart Rate Variability Analyses in Parkinson’s Disease: A Systematic Review and Meta-Analysis. Brain Sciences (2021).
7. The Management of Orthostatic Hypotension in Parkinson’s Disease. Frontiers in Neurology (2013).
8. Exploring hyperhidrosis and related thermoregulatory symptoms as a possible clinical identifier for the dysautonomic subtype of Parkinson’s disease. Journal of Neurology (2019).