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An Interactional Profile to Assist the Differential Diagnosis of Neurodegenerative and Functional Memory Disorders

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Objective:

Specialist services for dementia are seeing an increasing number of patients. We investigated whether interactional and linguistic features in the communication behavior of patients with memory problems could help distinguish between those with problems secondary to neurological disorders (ND) and those with functional memory disorder (FMD).

Methods:

In part 1 of this study, a diagnostic scoring aid (DSA) was developed encouraging linguists to provide quantitative ratings for 14 interactional features. An optimal cut-off differentiating ND and FMD was established by applying the DSA to 30 initial patient-doctor memory clinic encounters. In part 2, the DSA was tested prospectively in 10 additional cases analyzed independently by 2 conversation analysts blinded to medical information.

Results:

In part 1, the median score of the DSA was +5 in ND and −5 in FMD (P<0.001). The optimal numeric DSA cut-off (+1) identified patients with ND with a sensitivity of 86.7% and a specificity of 100%. In part 2, DSA scores of rater 1 correctly predicted 10/10 and those of rater 2 predicted 9/10 diagnoses.

Conclusions:

This study indicates that interactional and linguistic features can help distinguish between patients developing dementia and those with FMD and could aid the stratification of patients with memory problems.
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Keywords: dementia; functional memory disorder; screening

Document Type: Research Article

Affiliations: 1: Department of Neuroscience, University of Sheffield 2: School of Allied Health Sciences, De Montfort University, Leicester 3: Department of Neurology, Sheffield Teaching Hospitals National Health Service Foundation Trust, Sheffield 4: School of Dementia Studies, Centre for Applied Dementia Studies, University of Bradford, Bradford 5: UCL Institute for Women’s Health, London 6: Department of Social Sciences, Loughborough University, Loughborough, UK

Publication date: July 1, 2018

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