Rate of decline in Alzheimer disease measured by a Dementia Severity Rating Scale

Alzheimer Dis Assoc Disord. Jul-Sep 2009;23(3):268-74. doi: 10.1097/WAD.0b013e318194a324.

Abstract

Objective: To measure clinically relevant change in Alzheimer disease (AD) using a family member-completed Dementia Severity Rating Scale (DSRS) questionnaire.

Background: Measuring rate of change provides important clinical information. Most neuropsychologic scores change nonlinearly, complicating their use as a predictor of change throughout the illness.

Methods: DSRS and Mini Mental State scores were prospectively collected on 702 patients with AD from first evaluation until they became too impaired to return to clinic.

Results: DSRS score increased an average of 4.48 points/y [95% confidence interval (CI): 4.14-4.82] throughout the entire range of severity. In contrast, the Mini Mental State declined an average of 2.15 points/y (95% CI: 1.85-2.46) during the first 2 years, accelerated to 3.83 points/y (95% CI: 3.28-4.38) during the subsequent 3 years, and then slowed to an annual decline of 1.63 points during the last 2 years (95% CI: 0.21-3.05). A younger age of symptom onset was associated with an increased rate of DSRS change (P=0.03).

Conclusions: The DSRS provides a clinical measure of functional impairment in AD that increases about 4.48 points/y from the earliest symptomatic stage until patients become too severely impaired to return to clinic.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adult
  • Age of Onset
  • Aged
  • Aged, 80 and over
  • Alzheimer Disease / diagnosis*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Neuropsychological Tests
  • Psychiatric Status Rating Scales
  • Reproducibility of Results
  • Severity of Illness Index*
  • Surveys and Questionnaires*