Abstract
Purpose
To assess the prevalence of urgent hospitalization due to adverse drug reactions (ADRs) in patients aged ≥65 years, to compare the in-hospital mortality rates between patients admitted for ADRs and those admitted for other causes, and to describe the ADRs, the used and suspected drugs, and the drug-reaction associations.
Methods
A cross-sectional study was conducted by using the institutional database of the Pharmacovigilance Programme of Bellvitge University Hospital, a 750-bed tertiary care hospital, with information corresponding to a 7-year period. ADR-related admissions of patients aged ≥65 years prospectively identified through a systematic daily review of all admission diagnosis were reviewed.
Results
ADRs were suspected to be the main reason for urgent admission in 1976 out of 60,263 patients aged ≥65 years (prevalence of ADR-related hospitalization 3.3 % [95 % CI 3.1–3.4 %]). The crude in-hospital mortality rate was 10.2 % in patients with ADR-related admission and 9 % in patients admitted for other causes (p = 0.077). Most patients (86 %) were exposed to polypharmacy, and a drug-drug interaction was suspected in 49 % of cases. The most frequent drug-reaction associations were acute renal failure related to renin-angiotensin system inhibitors, gastrointestinal bleeding caused by antithrombotics and/or non-steroidal anti-inflammatories, and intracranial bleeding induced by vitamin K antagonists.
Conclusions
One out of every 30 urgent admissions of patients aged ≥65 years is ADR-related. These ADRs can be as serious and life-threatening as any other acute pathology that merits urgent hospital admission. Most cases involve patients exposed to polypharmacy and result from well-known reactions of a few commonly used drugs.
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Acknowledgments
The authors thank Mr. Angus Powles for his support in linguistic revision of the manuscript.
Contributions of authors statement
Dr Pedrós is the principal investigator of the present study and affirms that everyone who contributed significantly to the present work has been listed as co-author.
Dr Pedrós had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: All authors.
Acquisition of data: Dr Pedrós, Dr Corbella.
Statistical analysis: Dr Pedrós.
Analysis and interpretation of data: All authors.
Administrative, technical, or material support: Dr Pedrós.
Drafting of the manuscript: Dr Pedrós.
Critical revision of the manuscript for important intellectual content: All authors.
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No sources of funding were used to assist in the development of this study.
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The authors declare that they have no conflicts of interest.
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All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted. For this type of study, formal consent is not required. This study was approved by the Clinical Research Ethics Committee of the Bellvitge University Hospital (study code EPA019/15).
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Figure 1
Pre-defined list of admission diagnoses that are potential adverse drug reactions. (DOC 48 kb)
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Pedrós, C., Formiga, F., Corbella, X. et al. Adverse drug reactions leading to urgent hospital admission in an elderly population: prevalence and main features. Eur J Clin Pharmacol 72, 219–226 (2016). https://doi.org/10.1007/s00228-015-1974-0
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DOI: https://doi.org/10.1007/s00228-015-1974-0