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Abstract

Background: The relationship between the medication regimen complexity index (MRCI) and adverse drug reaction(ADR)-related hospital admissions has not yet specifically been investigated. Objective: To evaluate the MRCI andcompare with medication count for prediction of ADR-related hospital admissions in older patients. Methods: This was aretrospective analysis of a prospectively collected convenience sample of 768 unplanned medical admissions of Australiansaged 65 years old and older. The sample consisted of 115 (15.0%) ADR-related unplanned hospital admissions and 653(85.0%) non–ADR-related unplanned medical admissions. The MRCI score was calculated from the medical records andanalyzed to predict ADR-related hospital admissions. Results: The cohort had a median age of 81 years, 5 comorbidities,and 11 medications, with a slight majority of women. The MRCI score was not significantly different in patients whohad ADR-related admissions compared with other medical admissions—38.5 versus 34.0, respectively; Wilcoxon RankSum test W = 33522; P = 0.067. The medication count was significantly different between the ADR-related admissionscompared with other medical admissions: 12 versus 10; W = 32 508; P = 0.021. However, the medication count wasnot a strong predictor of ADR-related admissions; unadjusted odds ratio = 1.044; 95% CI = 1.006-1.084. Conclusion:and Relevance: The MRCI score did not discriminate between ADR-related admissions and other medical admissionsdespite taking time to calculate with potential for inconsistent application. Medication count is more readily applicablewith marginally greater relevance in this cohort; however, both measures do not appear to be useful when used alone forclinicians to identify patients at risk of ADRs.

Item Type:	Article
Authors/Creators:	Curtain, CM and Chang, JY and Cousins, J and Parameswaran Nair, N and Bereznicki, B and Bereznicki, L
Keywords:	medication regimen complexity, older patients, adverse drug reactions, hospital admission
Journal or Publication Title:	The Annals of Pharmacotherapy
Publisher:	Harvey Whitney Books Co
ISSN:	1060-0280
DOI / ID Number:	10.1177/1060028020919188
Copyright Information:	Copyright 2020 The Authors
Related URLs:	Google Scholar: Curtain, CM UTAS Profile: Curtain, CM Google Scholar: Cousins, J UTAS Profile: Cousins, J Google Scholar: Parameswaran Nair, N Google Scholar: Bereznicki, B UTAS Profile: Bereznicki, B Google Scholar: Bereznicki, L UTAS Profile: Bereznicki, L
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