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Related Experiment Video

Updated: Jul 6, 2025

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Blepharoclonus in Parkinsonism.

Jason Margolesky1, Matthew Feldman1, Sarah Marmol1

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|December 29, 2023
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Summary
This summary is machine-generated.

Blepharoclonus, an eyelid fluttering sign, is highly prevalent in Parkinson disease (PD) patients. Its presence may help differentiate PD from other parkinsonian syndromes, particularly synucleinopathies.

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Area of Science:

  • Neurology
  • Clinical Neuroscience

Background:

  • Blepharoclonus is frequently observed in Parkinson disease (PD) clinical practice.
  • Its prevalence and diagnostic utility in PD versus atypical parkinsonian syndromes are not well-established.
  • Understanding blepharoclonus frequency may aid in differentiating parkinsonian disorders.

Purpose of the Study:

  • To determine the frequency of blepharoclonus in a cohort of PD patients.
  • To assess the association of blepharoclonus with PD disease stage, tremor severity, and non-motor symptoms.
  • To compare blepharoclonus prevalence in synucleinopathy versus non-synucleinopathy parkinsonism.

Main Methods:

  • Prospective enrollment of 85 patients (75 with PD, 10 with atypical parkinsonism).
  • Blepharoclonus defined as sustained eyelid fluttering (>5 seconds) after gentle eye closure.
  • Data collection included demographics, MDS-UPDRS, REM Sleep Behavior Disorder Questionnaire, and tremor/dyskinesia assessments.

Main Results:

  • Blepharoclonus was present in 84% (63/75) of PD patients.
  • Among atypical parkinsonism cases, 3/5 with synucleinopathy had blepharoclonus, while 0/5 with non-synucleinopathy did.
  • No association with disease stage, tremor severity, or non-motor symptoms was detailed in the abstract.

Conclusions:

  • Blepharoclonus is highly prevalent in Parkinson disease, suggesting potential as a clinical marker.
  • Absence of blepharoclonus in parkinsonism might indicate a non-synucleinopathy.
  • Further research with larger cohorts is needed to confirm blepharoclonus's utility in distinguishing PD and synucleinopathies.