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Potentially inappropriate medication use and mortality in patients with cognitive impairment

  • Pharmacoepidemiology and Prescription
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Abstract

Purpose

Potentially inappropriate medications (PIMs) are associated with falls, hospitalization, and cognitive decline. Few studies have investigated the association between PIMs related to cognitive impairment (PIMCog) and mortality in dementia or mild cognitive impairment (MCI).

Methods

This was a retrospective observational study. Patients diagnosed with MCI or dementia (DSM-IV criteria) presenting to a tertiary-referral memory clinic from 2013 to 2019 were eligible. The primary outcome was all-cause death. Secondary outcomes were vascular death and non-vascular death. The primary exposure variable of interest was PIMCog, defined as any medication in the Beers 2015 or STOPP criteria, classified as potentially inappropriate for patients with cognitive impairment. Anticholinergic burden was measured using the anticholinergic cognitive burden (ACB) scale. Polypharmacy was defined as ≥ 5 medications. Cox proportional hazard models were used to calculate hazard ratios (HRs) and 95% confidence intervals (95% CIs).

Results

Four hundred eighteen patients were included (n = 261 dementia, n = 157 MCI). The median age was 79 (interquartile range [IQR] 74–82) and median follow-up was 809 days (IQR 552–1571). One or more PIMCog was prescribed in 141 patients (33.4%). PIMCog use was associated with all-cause mortality after adjustment for age, sex, dementia severity, Charlson’s Co-morbidity Index, chronic obstructive pulmonary disease, congestive cardiac failure, and peripheral vascular disease (HR 1.96, 95% CI 1.24–3.09). PIMCog use was associated with vascular death (HR 3.28, 95% CI 1.51–7.11) but not with non-vascular death (HR 1.40 95% CI 0.78–2.52).

Conclusion

PIMCog use in patients with cognitive impairment is high. It is independently associated with all-cause mortality and vascular death. This is a potential modifiable risk factor for death in this patient cohort. Further research is required to independently validate this finding.

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Authors and Affiliations

  1. Department of Geriatric Medicine, Mater Misericordiae University Hospital, Dublin, Ireland

    Emily Buckley, Agnes Jonsson, Zoe Flood, Maria Lavelle, Noelle O’Sullivan, Nadra Nurdin, Philip Dowling, Eoin Duggan, Elizabeth Callaly, Colm Byrne, Cora McGreevy, Joseph Duggan, Lorraine Kyne & John J. McCabe

  2. School of Medicine, University College, Dublin, Ireland

    Emily Buckley, Elizabeth Callaly, Colm Byrne, Cora McGreevy, Joseph Duggan, Lorraine Kyne & John J. McCabe

  3. Stroke Clinical Trials Network Ireland, Catherine Mc Auley Centre, Dublin, Ireland

    John J. McCabe

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Contributions

Study concept: EB, JM, LK; Study design: EB, JM, LK; acquisition of data: all authors; analysis of data: EB, JM, LK; interpretation of data: EB, JM, LK; reviewing manuscript drafts: all authors; approval of final draft to be submitted for publication: all authors.

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Correspondence to Emily Buckley.

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Buckley, E., Jonsson, A., Flood, Z. et al. Potentially inappropriate medication use and mortality in patients with cognitive impairment. Eur J Clin Pharmacol 78, 2013–2020 (2022). https://doi.org/10.1007/s00228-022-03410-2

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