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Shared demographics and comorbidities in different functional motor disorders.

J M Gelauff1, J G M Rosmalen2, J Gardien1

  • 1University of Groningen, University Medical Center Groningen, Department of Neurology, the Netherlands.

Parkinsonism & Related Disorders
|December 1, 2019
PubMed
Summary

Functional motor disorders show symptom overlap, suggesting shared mechanisms. Physical functioning and social adjustment vary by dominant motor symptom, with gait disorders impacting functioning most severely.

Keywords:
Conversion disorderFunctional motor disordersFunctional movement disordersNon-motor featuresPsychogenic movement disorders

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Area of Science:

  • Neurology
  • Neuroscience
  • Clinical Medicine

Background:

  • Functional motor disorders (FMDs) are typically classified by their primary motor symptom.
  • Understanding variations in patient characteristics and outcomes across different FMDs is crucial for targeted interventions.

Purpose of the Study:

  • To investigate demographic differences, onset patterns, and symptom severity (pain, fatigue, depression, anxiety) among patients with distinct dominant motor symptoms in FMDs.
  • To compare levels of physical functioning, quality of life, and social adjustment across different FMD groups.
  • To explore the hypothesis that overlapping symptoms in FMDs indicate shared underlying mechanisms.

Main Methods:

  • Analysis of baseline data from the Self-Help and Education on the Internet for Functional Motor Disorders Trial.
  • Patients categorized into dominant motor symptom groups (tremor, myoclonus, dystonia, paresis, gait disorder) based on neurologist diagnosis.
  • Online questionnaire used to collect data on demographics, onset, pain, fatigue, depression, anxiety, physical functioning, quality of life, and social adjustment; statistical comparisons performed.

Main Results:

  • No significant differences found in demographics, onset, pain, fatigue, depression, or anxiety across the FMD groups.
  • Physical functioning was significantly worse in the gait disorder group compared to tremor and myoclonus groups.
  • Social adjustment was more impaired in gait disorder and paresis groups compared to the myoclonus group.

Conclusions:

  • No significant differences in demographic factors, onset, or psychological/somatic symptoms were observed between FMD groups.
  • Variations in physical functioning and social adjustment highlight distinct impacts of specific dominant motor symptoms.
  • The substantial overlap in reported symptoms supports the theory of common underlying mechanisms in functional motor disorders.