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. 2009 Jan;194(1):34-9.
doi: 10.1192/bjp.bp.108.052050.

Diagnostic accuracy of 123I-FP-CIT SPECT in possible dementia with Lewy bodies

John T O'Brien  1 , Ian G McKeith, Zuzana Walker, Klaus Tatsch, Jan Booij, Jacques Darcourt, Moritz Marquardt, Cornelia Reininger; DLB Study Group
Affiliations

Diagnostic accuracy of 123I-FP-CIT SPECT in possible dementia with Lewy bodies

John T O'Brien et al. Br J Psychiatry. 2009 Jan.

Abstract

Background: (123)I-FP-CIT SPECT (single photon emission computed tomography) can help in the differential diagnosis of probable dementia with Lewy bodies (Lewy body dementia) and Alzheimer's disease.

Aims: Our aim was to determine the accuracy of (123)I-FP-CIT SPECT in diagnosing people with possible dementia with Lewy bodies.

Method: We undertook a 12-month follow-up of 325 individuals with probable or possible Lewy body or non-Lewy body dementia who had previously undergone (123)I-FP-CIT SPECT. A consensus panel, masked to SPECT findings, established diagnosis at 12 months in 264 people.

Results: Of 44 people with possible dementia with Lewy bodies at baseline, at follow-up the diagnosis for 19 people was probable dementia with Lewy bodies (43%), in 7 people non-Lewy body dementia (16%) and for 18 individuals it remained possible dementia with Lewy bodies (41%). Of the 19 who at follow-up were diagnosed with probable dementia with Lewy bodies, 12 had abnormal scans at baseline (sensitivity 63%); all 7 individuals with a possible diagnosis who were diagnosed as having Alzheimer's disease at follow-up had normal scans (specificity 100%).

Conclusions: Our findings confirm the diagnostic accuracy of (123)I-FP-CIT SPECT in distinguishing Lewy body from non-Lewy body dementia and also suggest a clinically useful role in diagnostically uncertain cases, as an abnormal scan in a person with possible dementia with Lewy bodies is strongly suggestive of dementia with Lewy bodies.

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