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Discriminative and predictive power of an informant report in mild cognitive impairment
  1. V Isella,
  2. L Villa,
  3. A Russo,
  4. R Regazzoni,
  5. C Ferrarese,
  6. I M Appollonio
  1. Neurology Section, San Gerardo Hospital, Monza, Department of Neurosciences, University of Milan Bicocca, Italy
  1. Correspondence to:
 Dr V Isella
 Clinica Neurologica, Ospedale S. Gerardo, Via Donizetti 106, 20052, Monza (MI) Italy; valeria.isella{at}unimib.it

Abstract

Background: The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) requires caregivers to rate decline in patients’ cognitive and functional performance and has never been used for mild cognitive impairment (MCI).

Methods: We contrasted the discriminative and predictive power of the IQCODE with that of the Mini Mental State Examination (MMSE) and a verbal episodic memory measure, the Rey’s Auditory Verbal Learning Test (RAVLT), in 45 patients with MCI (mean (SD) age at baseline: 71.6 (4.7) years) and 30 outpatients with dementia (70.5 (6.3) years) attending the Neuropsychology Service, St Gerardo Hospital, and compared them with 55 cognitively intact elderly people (70.7 (7.1) years). Patients with MCI were followed up for at least 2 years or until conversion to dementia.

Results: In total, 24 patients with MCI (53.3%) had converted to dementia at follow up (mean (SD) duration of follow up 17.0 (7.3) months for converters and 35.0 (7.1) months for non-converters). At baseline, the ability to differentiate patients with MCI from healthy controls was similar for the IQCODE (area under the curve (AUC) 0.86) and the MMSE (AUC 0.84; z = 0.53, not significant). As predictors of conversion to dementia, a trend favouring the IQCODE (AUC 0.86) with respect to immediate (AUC 0.74) and delayed (AUC 0.75) recall on the RAVLT was apparent (z = 1.36, p = 0.087 versus immediate recall, z = 1.51, p = 0.064 versus delayed recall). The independent predictive ability of IQCODE and memory scores was evaluated through logistic regression, and the questionnaire alone yielded the best correct classification of 81%.

Conclusions: The IQCODE is an informant based measure of cognitive decline that may provide a relevant contribution to the diagnostic and prognostic investigation of patients with MCI.

  • AD, Alzheimer’s disease
  • AUC, area under the curve
  • DSM-IV, Diagnostic and statistical manual of mental disorders
  • FTD, frontotemporal dementia
  • IQCODE, Informant Questionnaire on Cognitive Decline in the Elderly
  • MCI, mild cognitive impairment
  • MMSE, Mini Mental State Examination
  • NOS, not otherwise specified
  • RAVLT, Rey’s Auditory Verbal Learning Test
  • ROC, receiver operating characteristic
  • SVD, subcortical vascular dementia
  • mild cognitive impairment
  • IQCODE
  • informant-based instruments
  • dementia
  • neuropsychology

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Footnotes

  • Competing interests: none

  • All necessary approval for the study was secured from the ethics committee of St Gerardo Hospital, Monza, and written consent was obtained from patients taking part in the study.

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