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Risk Factors for Adverse Drug Events Among Nursing Home Residents
Terry S. Field, DSc;
Jerry H. Gurwitz, MD;
Jerry Avorn, MD;
Danny McCormick, MD, MPH;
Shailavi Jain, RPh;
Marie Eckler, RN, MS, CS, CRRN, GNP;
Marcia Benser, RN, MS;
David W. Bates, MD
Arch Intern Med. 2001;161:1629-1634.
Background In a prospective study of nursing home residents, we found adverse drug
events (ADEs) to be common, serious, and often preventable. To direct prevention
efforts at high-risk residents, information is needed on resident-level risk
factors.
Methods Case-control study nested within a prospective study of ADEs among residents
in 18 nursing homes. For each ADE, we randomly selected a control from the
same home. Data were abstracted from medical records on functional status,
medical conditions, and medication use.
Results Adverse drug events were identified in 410 nursing home residents. Independent
risk factors included being a new resident (odds ratio [OR], 2.8; 95% confidence
interval [CI], 1.5-5.2) and taking anti-infective medications (OR, 4.0; CI,
2.5-6.2), antipsychotics (OR, 3.2; CI, 2.1-4.9), or antidepressants (OR, 1.5;
CI, 1.1-2.3). The number of regularly scheduled medications was associated
with increased risk of ADEs; the OR associated with taking 5 to 6 medications
was 2.0 (CI, 1.2-3.2); 7 to 8 medications, 2.8 (CI, 1.7-4.7); and 9 or more,
3.3 (CI, 1.9-5.6). Taking supplements or nutrients was associated with lower
risk (OR, 0.42; CI, 0.27-0.63). Preventable ADEs occurred in 226 residents.
Independent risk factors included taking opioid medications (OR, 6.6; CI,
2.3-19.3), antipsychotics (OR, 4.0; CI, 2.2-7.3), anti-infectives (OR, 3.0;
CI, 1.6-5.8), antiepileptics (OR, 2.2; CI, 1.1-4.5), or antidepressants (OR,
2.0; CI, 1.1-3.5). Scores of 5 or higher on the Charlson Comorbidity Index
were associated with increased risk of ADEs (OR, 2.6; CI, 1.1-6.0). The number
of regularly scheduled medications was also a risk factor: the OR for 7 to
8 medications was 3.2 (CI, 1.4-6.9) and for 9 or more, 2.9 (CI, 1.3-6.8).
Residents taking nutrients or supplements were at lower risk (OR, 0.27; CI,
0.14-0.50).
Conclusions It is possible to identify nursing home residents at high risk of having
an ADE. Particular attention should be directed at new residents, those with
multiple medical conditions, those taking multiple medications, and those
taking psychoactive medications, opioids, or anti-infective drugs.
From the Meyers Primary Care Institute (Drs Field and Gurwitz and Mss
Jain, Eckler, and Benser) and Department of Medicine, University of Massachusetts
Medical School (Drs Field and Gurwitz), Worcester; Divisions of Pharmacoepidemiology
and Pharmacoeconomics (Dr Avorn) and Medicine (Dr Bates), Brigham and Women's
Hospital, and Department of Medicine, Harvard Medical School (Dr Avorn), Boston,
Mass; and Department of Medicine, Division of Social and Community Medicine,
Cambridge Hospital, Cambridge, Mass (Dr McCormick).
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