Abstract
Potentially inappropriate medication (PIM) was associated with adverse clinical outcomes and higher healthcare resource utilization among older patients. In order to investigate the prevalence of PIM use based on three different sets of criteria and their associated factors among older patients in the emergency department (ED) in Taiwan. The National Health Insurance Research Database was used for this cross-sectional study. Older patients who visited the ED at least once in 2009 were enrolled. PIMs were identified based on the Beers Criteria, PIM-Taiwan criteria, and PRISCUS criteria. Average patient age was 76.7 ± 7.4 years and patients visited the ED 1.8 ± 2.1 times in 2009. The prevalence and frequency of being prescribed at least one PIM at each visit were high according to all three sets of criteria. Performance of the PIM-Taiwan criteria was only inferior to that of the Beers Criteria. The most important factor associated with PIM was the number of medications prescribed in the ED, and PIM use was associated with higher annual health resource utilization in the ED. PIM use was a significant issue and was associated with higher annual emergency care resource utilization in the ED.
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Introduction
Emergency department (ED) utilization is increasing for older adults and the number of annual visits is rapidly increasing1,2. In Taiwan, patients can visit the ED of private or public hospitals without a referral3. Older patients have more chronic conditions with potential acute exacerbations than do younger patients. In previous studies, older adults visited the ED more frequently compared to their relative proportion of overall Taiwanese beneficiaries2. They also underwent more laboratory and imaging studies, were prescribed more medications, and benefited from more staff care time compared with younger patients2. Among older adults, ED visits can be regarded as sentinel events for declining health status and a higher risk of adverse outcomes1. Therefore, physicians in the ED need to provide complex care and prevent iatrogenic diseases for older ED patients.
Adverse drug events (ADEs) account for the majority of iatrogenic complications of pharmacotherapy. In a previous report, the majority of these events were preventable4 and had been important targets for improvements to healthcare quality. To prevent ADE, prescriptions for older adults should consider the influence of the aging processes and chronic diseases on pharmacodynamics and pharmacokinetics. In addition, some medications have a higher risk of adverse events than efficacy rates. Potentially inappropriate medication (PIM) lists and criteria have been developed to prevent the use of this high-risk medication among the older population. The Beers Criteria5 have been widely used for PIM-related studies but are likely not applicable to all countries. Variations in available medications and prescribing preferences in different countries has led to the establishment of country-specific PIM lists, including the PIM-Taiwan criteria (Taiwan) and PRISCUS (German) criteria6,7. In previous studies, PIM was associated with adverse clinical outcomes and higher healthcare resource utilization8,9,10. Decreasing the rate of PIM prescription is a strategy that can be used to reduce the incidence of ADE among the older population.
The prevalence of PIM prescription among older ED patients increased from 5.6% to 26%11,12,13,14,15,16 with older Beers Criteria. Prescribing higher numbers of medications in the ED increases the risk of PIM use, and PIM use in the ED has been associated with ED attendance. To avoid further ADEs upon discharge from the ED, avoiding the prescription of PIMs in the ED has been recommended17. To date, a limited number of studies using the most updated (2015) Beers Criteria and country-specific PIM criteria12,13,14,15,16,18,19,20 have been applied to determine the prevalence of PIM and associated factors among older ED patients. Understanding this important issue in the ED will highlight concerns regarding PIM use and could lead to changes in prescribing preferences among ED physicians. However, only the Beers criteria had been applied to investigate the impacts of PIM among older ED patients in Taiwan. PIM-Taiwan had been published in 20126 but this country-specific PIM criteria have not been applied to this population.
The primary aim of this study was to determine the frequency of administration of PIMs and common PIM-related diagnoses based on country-specific criteria (PIM-Taiwan criteria) and non-country specific criteria (2015 Beer criteria and PRISCUS criteria) among older ED patients by conducting a cross-sectional study based on Taiwan National Health Insurance Research Database. The secondary aim was to determine which patient- and ED visit-level factors were associated with PIM prescription.
Results
Characteristics of older adult patients, physicians, hospitals, and ED visits
In 2009, the NHIRD data captured a total of 313,733 older adults who had visited the ED at least once. Patient, physician, and hospital basic characteristics are presented in Table 1. The study population had an average age of 76.7 ± 7.4 years and an equal gender distribution. On average, patients had 1.8 ± 2.1 ED visits in 2009 and nearly 30% of visits were to EDs located in medical centers. Fifty-seven percent of physicians who treated older ED patients specialized in emergency medicine.
Characteristics of three sets of explicit criteria for PIM use and leading ten PIMs in the emergency department
The prevalence of PIM use and frequency of visits associated with PIMs differed between the three sets of PIM criteria used. Among the three sets of criteria, the 2015 version of the Beers Criteria included a higher number of statements and medications (Table 2). The proportion of patients administered at least one PIM (63.7%) and frequency of visits at which at least one PIM was prescribed (53.4%) were also highest according to the 2015 version of the Beers Criteria and lowest according to the PRISCUS criteria. Among PIM user, on average one PIM was prescribed in the ED for each patient in 2009 and nearly every visit to the ED was associated with at least one PIM in the Beers Criteria. The top ten PIMs were listed, indicating the most common diagnosis made for prescribing each medication. Ketorolac ranked first in the Beers Criteria and PIM-Taiwan criteria, whereas diphenhydramine ranked first in the PRISCUS criteria (Table 3). The top three leading diagnoses for PIM use in the ED were fever, dizziness and giddiness, and abdominal pain.
Comparison of the characteristics between patients with and without at least one PIM prescription
Bivariate associations between patient, physician, hospital, and visit variables and use of PIMs are also reported (Appendix Tables 1 and 2). Women and ED patients between 65–74 years of age were more likely to be prescribed PIMs based on all three sets of criteria. For all three sets of PIM criteria, PIM users had more chronic conditions, visited more hospitals, encountered higher numbers of physicians, and were prescribed higher numbers of medications compared to patients without PIM use. Regarding visit-, physician-, and hospital-level characteristics, the associations between PIM use and associated factors were not entirely consistent based on the three sets of criteria.
Multivariate logistic regression analysis for patient-level factors revealed that women and the subjects aged between 65–74 years old had a lower risk of being prescribed PIMs in the ED based on the three sets of criteria (Table 4). Having more than three diagnoses at annual ED visits was also associated with a higher risk of PIM use. Number of hospitals visited was associated with PIM use only when the PRISCUS criteria were applied. Similarly, number of physicians encountered in the ED was associated with PIM use only when the PIM-Taiwan criteria were applied. Finally, for all three sets of criteria, the risk of being prescribed PIMs increased when patients were prescribed higher numbers of drugs at annual ED visits, especially according to the Beers Criteria.
Regarding physician characteristics, the associations with PIM use differed between the three sets of criteria in the multivariate logistic regression analysis (Table 5). Physicians aged older than 40 years prescribed more PIMs to older ED patients. In contrast, older physicians prescribed fewer PIMs based on the other two sets of criteria. When physicians in the ED were certified as emergency medicine specialists, they were less likely to prescribe PIMs according to the PRISCUS criteria but were more likely to prescribe PIMs according to the Beers Criteria and PIM-Taiwan criteria.
Regarding hospital- and ED visit-level characteristics, when older patients visited an ED not located in a medical center, they were more likely to be prescribed PIMs. PIM use was also associated with a higher number of medications and longer duration of prescription at each ED visit.
Discussion
To our knowledge, our study is the first to determine the nationwide prevalence of PIM use by applying three different criteria among older ED patients to determine the difference between country-specific and non-country specific criteria. Although most of the PIM criteria were established for chronic use of medications, this study demonstrated that the prevalence of PIM use among older ED patients and at each ED visit was high, especially for the 2015 Beers Criteria. A similar number of medications were listed in the PIM-Taiwan and PRISCUS criteria, although the prevalence of PIM use was higher according to the PIM-Taiwan criteria. Male physicians, non-medical center hospital accreditation, higher number of medications, and longer duration of prescriptions were all associated with PIM use. Finally, number of medications prescribed in the ED was the most important risk factor for PIM use.
In previous studies, the reported prevalence of PIM ranged from 1.5 to 26% among older ED patients11,12,13,14,16. In our national database, the proportion of PIM users was larger (more than 30%), especially for the 2015 version of the Beers Criteria. The number of medications listed in these criteria may have been the major cause of the observed differences. Previous studies were based on older versions of the Beers Criteria; in contrast, the 2015 version classified more medications as PIMs and the prevalence of PIM use therefore increased. Prescribing preferences were another important factor considered. Our data showed that the leading ten PIMs were mostly prescribed for symptom relief. Moreover, the prevalence of PIM users and proportion of PIMs among all prescribed medications were higher according to the PIM-Taiwan criteria than the PRISCUS criteria. Since we decided to use the earlier established nationwide data in 2009 for this study, the effect of PIM-Taiwan criteria (published in 2012) and PRISCUS criteria (published in 2010) publication that may cause reduction of PIM could be avoided. Also, both sets of criteria have not been updated. These results confirm the advantage of using country-specific criteria that consider regional prescribing preferences and the local pharmaceutical industry.
In previous research, medication-related complications could lead to ED visits and hospitalization among older adults21. PIM criteria were established to discourage the use of certain drugs associated with a higher risk of complications5. They have been applied widely across different clinical settings, even though they were initially established to prevent the chronic use of PIMs. It has been argued that the medications used in the ED were mostly short-term or even single-dose medications. However, certain medications can cause severe adverse effects, even in a single dose. For example, ketorolac ranked as the leading PIM in our study. The adverse effects of non-steroidal anti-inflammatory drugs (NSAIDs), including a higher risk of serious cardiovascular thrombotic events, myocardial infarction, and stroke have been reported22. In addition, NSAIDs have been associated with a higher incidence of gastrointestinal adverse events and anaphylactoid reactions23. Moreover, a study conducted in a small sample reported that the efficacy of treating acute fever in the ED was similar to that of acetaminophen24. Our results demonstrated that PIMs should be regarded as an important issue during the prescribing process for older ED patients. It would be reasonable for ED physicians to consider avoiding PIMs and to select alternatives with less adverse effects.
Since we used large sample size of data, the factors with small association were still detected. Several factors have been identified as predictors of PIM prescription including patient (being female and 65–74 years) and hospital characteristics (non-medical center) in multivariate logistic regression analysis. These results were similar to other nationwide studies12,16. Bias for reported associations included study size, selection bias and other uncontrolled confounding factors. For our study, we used nationwide database (including all claim data from all regional ED) and the sample size is large with less selection bias. Our results suggested that weak association could be affected by other uncontrolled confounding factors that were not collected in the claim data such as physiological data. Among patient characteristics, the number of medications prescribed per patient was the most important factor in all three sets of criteria. If older ED patients require higher numbers of medications to treat their diseases or symptoms in the ED, drug-drug interactions and PIMs should be considered upon discharge from the ED. Therefore, a systemic strategy is needed to prevent medication-related complications which could lead to further healthcare resource utilization. A computer-based warning system has been shown to be an effective method to avoid PIM prescription in the ED25. Further studies are needed to verify its effectiveness at preventing medication-related complications and patient-oriented outcomes in the ED. It is interesting that the associations between PIMs and the characteristics of physicians vary between different sets of criteria. Further studies collecting detailed physician information are needed to clarify these differences.
Although it is reasonable to use PIMs for certain conditions, we could not identify all diagnoses made in the ED since the NHIRD only collected the first three diagnoses made. In Taiwan, the definite diagnosis of certain symptoms such as fever, dizziness or abdominal pain might not be made at ED and the patients were admitted for further investigation. The ICD-9 CM codes were only coding for fever, dizziness or abdominal pain which were demonstrated that leading PIM were prescribed for fever, dizziness or abdominal pain in the Table 3. Moreover, we could not use condition-specific criteria to determine the prevalence of PIM use. We anticipated that if the criteria considering chronic condition were applied to population with comprehensive data of chronic conditions, the prevalence of PIM will increase. Additionally, the claims data did contain discharge data and we therefore could not separate the medications used in the ED from those prescribed upon discharge. A further limitation is that we did not consider other adverse drug events or drug-drug interactions in this study. This is another important factor to consider in relation to the quality of prescription for older patients. Finally, the causal relationship between PIM use and patient-, physician-, and ED visit-level characteristics could not be clearly defined in this cross-sectional study. Further prospective studies will be needed to verify this relationship.
This study demonstrated that PIMs was highly prevalent among older adults visiting ED, and were not seriously considered as an issue when prescribing medications to older patients in the ED. It is essential to encourage ED physicians to consider the risk-benefit ratio when prescribing medications to older patients, especially those with polypharmacy. As iatrogenic complications are unacceptable for older patients, the avoidance of PIMs with a high risk of adverse drug effects represents an important strategy. Country-specific PIM criteria could act as a reference for clinical practice in the ED.
Methods
Study Design
Taiwan’s National Health Insurance Research Database (NHIRD) was developed by National Health Research Institutes. It contains a nationally representative sample of beneficiary and claim data associated with emergency care. For confidentiality control, NHRI wound not release the records for the entire population of older adults. Only claim data of older adults whose birthday is odd number were selected. Therefore, the entire database enrolled claim data of about one million older adults. This sample represented half the population of older patients reimbursed in National Health Insurance in 2009. Only those having at least one visit of emergency department were enrolled for this study. Cross-sectional study was performed to examine the frequency of PIM use among older ED patients. The Research Ethics Committee of National Taiwan University Hospital approved the project as a waved study. We confirmed that all experiments were performed in accordance with relevant guidelines and regulations.
Study Population
We selected patients aged 65 years and older who had visited the ED at least once in 2009, regardless of their final disposition after treatment in the ED. Data collected included patient (65–74, 75–84, or ≥85 years)26 and physician age (≤40 or >40 years), patient and physician gender (male/female), patient diagnoses, number of ED visits, hospital accreditation, and types of oral medications prescribed in the ED. Up to three International Classification of Diseases 9th edition Clinical Modification (ICD-9 CM) codes were recorded for each ED visit. Information on all medication administration in the ED included generic drug names, dose, frequency and duration. Limitations of the NHIRD included the fact that clinical data such as patients’ weight, height, blood pressure, and liver and renal function were not collected in claims data. In addition, it was difficult to define which medications were prescribed at the time of the ED visit or upon discharge from the ED. Moreover, NHIRD did not contain an exhaustive list of diagnoses for their beneficiaries, for example if one with dementia visited ED for fever, the diagnosis of dementia might not contribute to this visit and it would not be recorded for claim. Also, the definite diagnosis of certain symptoms might not be confirmed at ED, such as fever, dizziness, or abdominal pain. Therefore, we only identified PIMs independent of chronic conditions. PIMs that were considered inappropriate independent of diagnosis in the PIM-Taiwan criteria6 (Taiwanese), the 2015 version of the Beers Criteria5 (American), and the PRISCUS criteria7 (German) were applied to determine the frequency of PIM use and users.
Data analysis
Analysis was conducted by two complementary perspectives: patient- and ED visit-level characteristics. All variables of interest to be examined in association with PIM were summed and presented as numbers per year. We used Kolmogorov-Smirnov test to examine the normality of continuous variables. For the ED visit-level analysis, prescription of PIMs was defined as at least one PIM based on the three sets of PIM criteria at a single ED visit. Associations of PIMS with characteristics of prescribing physicians and hospitals were investigated. For the patient-level analysis, PIMs users were defined as those who were prescribed at least one PIM in the ED. Bivariate analysis was performed using t-test or Mann-Whitney U test for continuous variables with normal or non-normal distribution, respectively. Chi-squared test for categorical variables was used to test correlations between PIMs and patient- or ED visit-level characteristics. Stepwise multivariate logistic regression models were used to identify the correlates of having at least one PIM at the patient and ED visit level after adjusting for potential confounders. All tests conducted were two-tailed, and significance was set at p < 0.05. The top ten PIMs from each set of PIM criteria were ranked by calculating the percentage of PIMs divided by total number of medications prescribed for older patients having at least one ED visit in 2009. Data were analyzed using SAS for Windows version 9.3 (SAS Institute Inc., Cary, NC, USA).
Data availability
The data that support the findings of this study were obtained from National Health Research Institutes (NHRI) of the Ministry of Health and Welfare in Taiwan. There are restrictions for the availability of these data, which should be used under license, and the database was not publicly available for duplication.
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Acknowledgements
The authors would like to thank Enago (www.enago.tw) for the English language review.
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Study concept development: D.C.C., S.J.H. and S.Y.Y.; study design: C.B.C., D.C.C., S.J.H., S.Y.Y. and H.Y.L.; designed and performed the study’s data analysis: H.Y.L., C.B.C. and S.Y.Y.; data interpretation: all authors; draft manuscript and literature study: R.S.W., H.C.L., C.B.C., D.C.C. and S.Y.Y.; final approval of the version to be published: D.C.C.
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Chang, CB., Lai, HY., Hwang, SJ. et al. Prescription of potentially inappropriate medication to older patients presenting to the emergency department: a nationally representative population study. Sci Rep 8, 11727 (2018). https://doi.org/10.1038/s41598-018-30184-4
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DOI: https://doi.org/10.1038/s41598-018-30184-4
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