Diagnostic and Prognostic Value of the Combination of Two Measures of Verbal Memory in Mild Cognitive Impairment due to Alzheimer's Disease

Isabel Sala, Ignacio Illán-Gala, Daniel Alcolea, Ma Belén Sánchez-Saudinós, Sergio Andrés Salgado, Estrella Morenas-Rodríguez, Andrea Subirana, Laura Videla, Jordi Clarimón, María Carmona-Iragui, Roser Ribosa-Nogué, Rafael Blesa, Juan Fortea, Alberto Lleó

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14 Citations (Scopus)

Abstract

© 2017 - IOS Press and the authors. All rights reserved. Background: Episodic memory impairment is the core feature of typical Alzheimer's disease. Objective: To evaluate the performance of two commonly used verbal memory tests to detect mild cognitive impairment due to Alzheimer's disease (MCI-AD) and to predict progression to Alzheimer's disease dementia (AD-d). Methods: Prospective study of MCI patients in a tertiary memory disorder unit. Patients underwent an extensive neuropsychological battery including two tests of declarative verbal memory: The Free and Cued Selective Reminding Test (FCSRT) and the word list learning task from the Consortium to Establish a Registry for Alzheimer's disease (CERAD-WL). Cerebrospinal fluid (CSF) was obtained from all patients and MCI-AD was defined by means of the t-Tau/Aβ1-42 ratio. Logistic regression analyses tested whether the combination of FCSRT and CERAD-WL measures significantly improved the prediction of MCI-AD. Progression to AD-d was analyzed in a Cox regression model. Results: A total of 202 MCI patients with a mean follow-up of 34.2±24.2 months were included and 98 (48.5) met the criteria for MCI-AD. The combination of FCSRT and CERAD-WL measures improved MCI-AD classification accuracy based on CSF biomarkers. Both tests yielded similar global predictive values (59.9-65.3 and 59.4-62.8 for FCSRT and CERAD-WL, respectively). MCI-AD patients with deficits in both FCSRT and CERAD-WL had a faster progression to AD-d than patients with deficits in only one test. Conclusions: The combination of FCSRT and CERAD-WL improves the classification of MCI-AD and defines different prognostic profiles. These findings have important implications for clinical practice and the design of clinical trials.
Original languageEnglish
Pages (from-to)909-918
JournalJournal of Alzheimer's Disease
Volume58
Issue number3
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Alzheimer's disease
  • biomarkers
  • cerebrospinal fluid
  • episodic memory
  • mild cognitive impairment
  • mild neurocognitive disorder
  • neuropsychological test

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