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Epidemiology.

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  • 1Departments of Clinical Neurosciences and of Rehabilitation Medicine, NHS Lothian and Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK.

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|October 11, 2016
PubMed
Summary
This summary is machine-generated.

Functional Neurologic Disorders (FND) are now better defined by positive symptom identification, not psychopathology. This clarification aids in understanding FND epidemiology and diagnosis.

Keywords:
conversion disorderepidemiologyfunctional neurological disorderincidenceprevalencepsychogenicpsychogenic symptoms

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Area of Science:

  • Neurology
  • Psychiatry
  • Epidemiology

Background:

  • Functional Neurologic Disorders (FND) previously lacked clear definitions, often mixing physical and psychological components.
  • This ambiguity complicated epidemiological studies and clinical understanding of FND.
  • The definition of FND has been a persistent challenge in neurology and psychiatry.

Purpose of the Study:

  • To clarify the epidemiology of Functional Neurologic Disorders (FND) based on updated diagnostic criteria.
  • To assess the incidence, prevalence, and diagnostic reliability of FND.
  • To discuss challenges in FND case definition, ascertainment, misdiagnosis, and risk factors.

Main Methods:

  • Utilized updated DSM-5 criteria for FND, focusing on positive identification of physical symptoms incongruent with neurologic disease.
  • Analyzed neurology outpatient contact data and community incidence rates.
  • Reviewed diagnostic revision rates and comorbid neurologic conditions.

Main Results:

  • Functional Neurologic Disorders (FND) constitute approximately 6% of neurology outpatient contacts.
  • Estimated community incidence rates for FND range from 4-12 per 100,000 per annum.
  • Diagnostic revision rates for FND are low (<5%), indicating reliable diagnosis even before advanced imaging.

Conclusions:

  • The revised DSM-5 definition of FND represents a significant advancement in clarifying the disorder.
  • FND are disabling conditions associated with distress, more common in women aged 35-50, but occurring across the lifespan.
  • Accurate case definition and understanding risk factors are crucial for improving FND management.