Delirium Severity Measure for Older Adults

Researchers from Harvard, Brown, and the University of Massachusetts have developed a new method for measuring delirium severity in older adults. A release from the Hebrew Senior Life Institute for Aging Research, a affiliate of Harvard Medical School in Boston explains that delirium is defined as the sudden onset of confusion or change in mental status that is often brought about by physical illness, surgery, or hospitalization. Delirium is a common and often costly condition that is a leading complication among older adults who are hospitalized. In fact, studies suggest that delirium in adults ages 65 and older is associated with hospital mortality rates of up to 33%, with estimated annual healthcare costs of more than $182 billion per year.

The new scoring system, CAM-S, is based on the Confusion Assessment Method (CAM) and standardizes the measurement of delirium severity for both clinical and research uses. Details of this study were published in April 2014 in Annals of Internal Medicine.

The release quotes Sharon K. Inouye, M.D., M.P.H., Director of the Aging Brain Center and Harvard Medical School Professor of Medicine, as saying, "Currently, the CAM is the most widely used tool in the world to screen for delirium. Our study is the first to develop and test this important new methodology, and to demonstrate the validity and reliability of the CAM-S, a novel approach to measure delirium severity."

The team developed and validated the CAM-S in two groups of patients. The first was a group of 300 patients 70 years of age or older who were scheduled for major surgery as part of the Successful Aging after Elective Surgery (SAGES) study. The second group was part of the Project Recovery study and included 919 older adults 70 or older who were admitted to the hospital. Researchers developed the CAM-S from the 4-item short form and 10-item long form versions of the CAM, and examined the impact of the CAM-S scores on hospital and post-hospital clinical outcomes.

CAM-S scores displayed a strong association with all clinical outcomes including length of hospital stay, nursing home placement, functional and cognitive decline, death, and hospital and post-hospital costs. The study found that length of hospital stay increases with the degree of delirium severity measured by the CAM-S short form from seven days for no delirium symptoms to 13 days for patients with severe delirium. The CAM-S long form showed similar increases in length of stay from six days to 12 days between no symptom and severe symptom groups.

Additionally, mean hospital costs increase with the degree of delirium severity measured by the CAM-S short form from $5,100 for patients without delirium symptoms to $13,200 for those with severe symptoms. Similar results were seen across all levels of the CAM-S long form scores with mean costs increasing from $4,200 to $11,400 across delirium symptom groups ranging from none to severe.

Dr. Inouye concludes, "Our findings demonstrate that the CAM-S provides a new standardized severity measure with high inter-rater reliability, and a strong association with clinical outcomes related to delirium. We believe that this measure holds great promise to improve understanding of the effects of delirium on clinical care, prognosis, pathophysiology, and response to treatment. Ultimately, we hope that this measure will help to prevent the effects of this devastating condition and improve quality of life for older adults."

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