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The syndrome of functional memory disorder: definition, etiology, and natural course

Klaus Schmidtke1, Susanne Pohlmann, Birgitta Metternich

  • 1Memory Clinic, Center for Geriatric Medicine and Gerontology Freiburg, University Hospital Freiburg, Freiburg, Germany. klaus.schmidtke@og.ortenau-klinikum.de

The American Journal of Geriatric Psychiatry : Official Journal of the American Association for Geriatric Psychiatry
|November 29, 2008
PubMed
Abstract

Insights

Functional memory disorder (FMD) often persists long-term, not resolving spontaneously in most patients. This persistent distress and cognitive dysfunction may be linked to ongoing psychosocial burden.

Area of Science:

  • Neurology
  • Psychiatry
  • Psychology

Background:

  • Nonorganic, functional memory disorder (FMD) is a common diagnosis in memory clinics.
  • FMD is a critical differential diagnosis for prodromal dementia.
  • FMD is defined as an acquired condition linked to psychosocial burden and distress.

Purpose of the Study:

  • To evaluate the natural course of functional memory disorder.
  • To understand the long-term prognosis of FMD.

Main Methods:

  • Prospective follow-up study conducted at a university hospital memory clinic.
  • Seventy-three patients with memory deficits and distress but normal cognitive tests were included.
  • Forty-six patients completed follow-up assessments after a mean of 20.1 months, with FMD severity and cognitive performance measured.

Main Results:

  • Common causes of distress included overwork, interpersonal conflicts, somatic illness, and adjustment disorders.
  • FMD resolved in only six patients, persisting in 39 at follow-up.
  • Average symptom severity decreased minimally, indicating limited natural recovery.

Conclusions:

  • Functional memory disorder is frequently a long-term condition, not a transient issue.
  • Persistent psychosocial burden and a cycle of distress and cognitive dysfunction may explain the chronicity of FMD.
  • Interventions addressing underlying stressors may be crucial for FMD management.

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