- 6 of 42 available tools (instruments) for assessing delirium severity meet high-quality criteria for use in routine clinical practice and research.
Why this matters
- Accurate assessment is important for prognostication.
- 11 tools were multidomain, delirium-specific instruments providing a quantitative rating of severity.
- 6 tools met all criteria:
- Relative estimated cost:
- Least: Confusion Assessment Method–Severity Score;
- Most: Delirium Rating Scale.
- Administration time:
- Shortest: Delirium-O-Meter, Delirium Observation Scale (
- Longest: Delirium Rating Scale (20-30 minutes).
- Most symptom domains covered: Confusional State Evaluation, Delirium-O-Meter (12 of 16 domains).
- Only instrument originally designed to be rated by lay interviewers (and clinicians), having predictive validity for range of outcomes in original study: Confusion Assessment Method–Severity Score.
- Systematic review of 42 tools used to assess delirium severity.
- Prespecified criteria: frequency of use, methodologic quality, construct validity, broad domain coverage.
- Main outcome: meeting all criteria.
- Funding: National Institutes of Health; Milton and Shirley F. Levy Family Chair.
- Some authors participated in tool development.
- Other search strategies may have identified different tools.
- Recently published tools disadvantaged by limited time for use.