Screening and detection of delirium in older ED patients: performance of the modified Confusion Assessment Method for the Emergency Department (mCAM-ED). A two-step tool

Abstract

Delirium is frequent in older Emergency Department (ED) patients, but detection rates for delirium in the ED are low. To aid in identifying delirium, we developed and implemented a two-step systematic delirium screening and assessment tool in our ED: the modified Confusion Assessment Method for the Emergency Department (mCAM-ED). Components of the mCAM-ED include: (1) screening for inattention, the main feature of delirium, which was performed with the Months Backwards Test (MBT); (2) delirium assessment based on a structured interview with questions from the Mental Status Questionnaire by Kahn et al. and the Comprehension Test by Hart et al. The aims of our study are (1) to investigate the performance criteria of the mCAM-ED tool in a consecutive sample of older ED patients, (2) to evaluate the performance of the mCAM-ED in patients with and without dementia and (3) to test whether this tool is efficient in keeping evaluation time to a minimum and reducing screening and assessment burden on the patient. For this prospective validation study, we recruited a consecutive sample of ED patients aged 65 and older during an 11-day period in November 2015. Trained nurses assessed patients with the mCAM-ED. Results were compared to the reference standard [i.e. the geriatricians’ delirium diagnosis based on the criteria of the Text Revision of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-TR)]. Performance criteria were computed. We included 286 consecutive ED patients aged 65 and older. The median age was 80.02 (Q1 = 72.15; Q3 = 86.76), 58.7% of included patients were female, 14.3% had dementia. We found a delirium prevalence of 7.0%. In patients with dementia, specificity and positive likelihood ratio were lower. When compared to the reference standard, delirium assessment with the mCAM-ED has a 0.98 specificity and a 39.9 positive likelihood ratio. In 80.0% of all cases, the first step of the mCAM-ED, i.e. screening for inattention with the MBT, took less than 30 s. On average, the complete mCAM-ED assessment required 3.2 (SD 2.0), 5.6 (SD 3.2), and 6.2 (SD 2.3) minutes in cognitively unimpaired patients, patients with dementia and patients with dementia or delirium, respectively. The mCAM-ED is able to efficiently rule out delirium as well as confirm the diagnosis of delirium in elderly patients with and without dementia and applies minimal screening and assessment burden on the patient.

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Fig. 1

Abbreviations

WH:

Wolfgang Hasemann

FFG:

Florian F. Grossmann

ED:

Emergency Department

mCAM-ED:

Modified Confusion Assessment method for the Emergency Department

MSQ:

Mental Status Questionnaire

mRASS:

Modified Richmond Agitation Sedation Scale

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Acknowledgements

We are thankful to all the ED staff, the geriatricians who performed the gold standard assessments, and Dr. Duncan Shabb for helpful discussions and proofreading the manuscript.

Funding

This study was funded through Scientific Funds of the University Hospital Basel.

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Correspondence to Wolfgang Hasemann.

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Conflict of interest

All authors declare that they have no conflict of interest with this study.

Statement of human rights

The study was approved by the cantonal ethics committee (identifier EKNZ-2015-123) and registered with ClinicalTrials.gov (identifier NCT02782143). All procedures performed in this study involving human participants were in accordance with the ethical standards of the local/national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

If possible, oral informed consent was obtained directly from the patient or an authorized proxy. Due to the minimal risk, little burden and potential benefit to the patient, the ethics committee allowed patients to be assessed even if there was no chance to obtain informed patient consent due to the nature of delirium or availability of a proxy.

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Hasemann, W., Grossmann, F.F., Stadler, R. et al. Screening and detection of delirium in older ED patients: performance of the modified Confusion Assessment Method for the Emergency Department (mCAM-ED). A two-step tool. Intern Emerg Med 13, 915–922 (2018). https://doi.org/10.1007/s11739-017-1781-y

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Keywords

  • Algorithms
  • Attention
  • Delirium
  • Dementia
  • Prevalence
  • Performance
  • Emergency medicine