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Eran Dayan1, Miriam Sklerov2, Nina Browner2

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Autonomic dysfunction in Parkinson disease (PD) is linked to altered brain connectivity. Specifically, patients with more severe autonomic symptoms show reduced functional connectivity between the hypothalamus and key brain regions involved in motor control.

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Area of Science:

  • Neuroscience
  • Neurology
  • Medical Imaging

Background:

  • Parkinson disease (PD) often involves autonomic dysfunction, impacting functions like blood pressure and digestion.
  • The hypothalamus (HTH) plays a crucial role in regulating the autonomic nervous system.
  • Understanding the neural basis of autonomic dysfunction in PD is essential for developing targeted therapies.

Purpose of the Study:

  • To investigate the association between autonomic dysfunction symptoms in Parkinson disease (PD) and alterations in intrinsic hypothalamic functional connectivity.
  • To determine if hypothalamic functional connectivity changes are specific to autonomic symptoms or related to general PD progression.

Main Methods:

  • Resting-state functional MRI (fMRI) was used to analyze brain connectivity in Parkinson disease patients.
  • Patients were categorized based on autonomic dysfunction severity using the SCOPA-AUT questionnaire.
  • Seed-based functional connectivity analysis focused on the hypothalamus (HTH), comparing high and low symptom groups.

Main Results:

  • Patients with higher autonomic dysfunction scores (SCOPA-AUT) exhibited significantly reduced functional connectivity between the hypothalamus and the striatum (caudate, putamen) and thalamus.
  • This disrupted thalamo-striato-hypothalamic connectivity remained significant after accounting for motor symptoms, disease duration, cognitive function, and age.

Conclusions:

  • Symptoms of autonomic dysfunction in Parkinson disease are associated with disrupted functional connectivity within the thalamo-striato-hypothalamic network.
  • These findings suggest central neural circuit deficits contributing to autonomic dysregulation in PD, independent of motor impairments.