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A Retrospective Comparison of Inappropriate Prescribing Of Schjøtt and Aßmus BMC Medical Informatics and Decision Making (2019) 19:102 https://doi.org/10.1186/s12911-019-0821-0 RESEARCHARTICLE Open Access A retrospective comparison of inappropriate prescribing of psychotropics in three Norwegian nursing homes in 2000 and 2016 with prescribing quality indicators Jan Schjøtt1,2* and Jörg Aßmus3 Abstract Background: Inappropriate prescribing of psychotropics is a persistent and prevalent problem in nursing homes. The present study compared inappropriate prescribing of psychotropics in nursing homes 16 years apart with prescribing quality indicators. The purpose was to identify any change in inappropriate prescribing of relevance for medical informatics. Methods: Three Norwegian nursing homes were audited in 2000 and 2016 with regard to prescribing quality. Psychotropics among 386 patients in 2000, and 416 patients in 2016, included combinations of antidepressants, antipsychotics, anxiolytics-hypnotics, and antiepileptics. Prescribing quality indicators included psychotropic polypharmacy (defined as concurrent use of three or more psychotropics) and potential inappropriate psychotropic substances or combinations. Furthermore, potential clinically relevant psychotropic interactions were classified as pharmacodynamic or pharmacokinetic using an interaction database. The first ranked (most important) interaction in each patient was selected with the following importance of categories in the database; recommended action > documentation > severity. Three levels (from low to high) within each category were used for ranking. Results: From 2000 to 2016, psychotropic polypharmacy increased from 6.2 to 29.6%, potential inappropriate psychotropic substances was reduced from 17.9 to 11.3% and potential inappropriate psychotropic combinations increased from 7.8 to 27.9%. Changes in polypharmacy and combinations were predominantly associated with prescribing of anxiolytics-hypnotics. Sixty-three patients (16.3%) had psychotropic interactions in 2000 increasing to 146 patients (35.1%) in 2016. The increase in interactions was associated with prescribing of antidepressants. First ranked interactions, more than 60% of all interactions in both years, were increasingly pharmacodynamic, from 69.9 to 91.0%. Interactions in 2016 were associated with a lower level of recommended action and documentation, but not severity compared to 2000. The inappropriate prescribing of antipsychotics and antiepileptics was reduced in 2016 compared to 2000. (Continued on next page) * Correspondence: [email protected] 1Department of Clinical Biochemistry and Pharmacology, Haukeland University Hospital, 5021 Bergen, Norway 2Department of Clinical Science, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway Full list of author information is available at the end of the article © The Author(s). 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Schjøtt and Aßmus BMC Medical Informatics and Decision Making (2019) 19:102 Page 2 of 11 (Continued from previous page) Conclusions: Using prescribing quality indicators we observed the importance of antidepressants and anxiolytics-hypnotics for inappropriate prescribing in 2016 while the role of antipsychotics and antiepileptics were reduced compared to 2000. A change to mainly pharmacodynamic interactions that lack good documentation was also observed. The present findings can be used for medical informatics-based approaches to address specific problems with prescribing, and prescribing quality indicators, in Norwegian nursing homes. Keywords: Drug interactions, Inappropriate prescribing, Medical informatics, Nursing homes, Psychotropics Background prescribing quality indicators [6–8, 15]. Identification of Use of one or more psychotropic drugs (e.g. psychotro- current and historical problems with inappropriate pre- pics like antidepressants, antipsychotics, anxiolytics and scribing, and prescribing quality indicators, could be useful hypnotics among others) is common in nursing homes for medical informatics-based approaches in Norwegian [1–3]. Use of psychotropics is high among patients with nursing homes. dementia (about 80% of nursing home patients), and psychotropics are used in treatment of agitation, delu- Methods sions, anxiety, depression, and sleep problems [4, 5]. In- Study population appropriate treatment with multiple psychotropics has One-day, point-prevalence of psychotropic prescribing been identified as the most frequent drug-related prob- in a convenience (non-randomised) sample was collected lem in nursing homes [6, 7]. A recent cross-sectional from the same three nursing homes in Bergen, Norway analysis among 451 nursing homes in France found that 16 years apart. No clinical or personal information other polypharmacy and prescribing of potentially inappropri- than patients’age and gender was collected. Nor was in- ate medications mainly concerned psychotropics [8]. formation pertaining to physicians, other staff, or details Psychotropics are associated with several adverse effects concerning organisation of the nursing homes. Only in older adults, most importantly risk of fall injuries, patients’aged ≥ 65 years were included at both sampling hospitalisations and mortality [9, 10]. times. Researchers were blinded to patients’nursing Prescribing quality indicators are recommended to home residence in 2016. support clinical decision making in pharmacotherapy The three nursing homes in 2016 included regular [11]. Indicators for inappropriate use of psychotropics units that provided long-term care, respite care, and re- include “concurrent use of three or more psychotropics” habilitation as well as units for short-term care. They [12]. This indicator is considered to be a proxy for poly- also included special care units that provide sheltered pharmacy with risk of adverse effects and psychotropic care for patients with dementia and psychogeriatric dis- interactions (PIs). Potentially inappropriate psychotropic eases. Thus, they reflect the transition in nursing homes combinations (PICP) or potentially inappropriate psy- from 2000 to 2016 with institutions consisting of mainly chotropic substances (PIPS) are more specific indicators regular units to institutions that also provide various compared to “concurrent use of three or more psycho- more specialized units. The two audits of prescribing tropics”, particularly with respect to increased risk of ad- were regarded as representative for identifying inappro- verse events among the elderly [12]. Drug interaction priate prescribing of psychotropics. databases are also frequently used to assess prescribing quality in nursing homes [7, 8]. Considering the quality Psychotropics of medical informatics and decision support, subscrip- The information on prescribing of psychotropics was tion databases should be preferred to open access data- manually collected from medical charts (cardex) by bases or prescribing and dispensing software systems pharmacists in March 2000. Data included prescribed [11, 13, 14]. psychotropics, time of administration and respective The present study compared prescribing of psychotro- doses. In March 2016, similar data were retrieved pics in 2000 and 2016 with prescribing quality indicators. automatically from electronic charts. Psychotropics The purpose was to identify any change in inappropriate were classified according to the Anatomical Thera- prescribing of psychotropics with regard to polypharmacy, peutic Chemical (ATC) classification system [16], and PICP, PIPS, and PIs. Inappropriate prescribing of psycho- included antipsychotics (ATC-code N05A), anxiolytics tropics is a persistent and prevalent problem in nursing (N05B), hypnotics (N05C), antidepressants (N06A) homes in Europe despite the introduction of several and antiepileptics (N03A). Anxiolytics and hypnotics Schjøtt and Aßmus BMC Medical Informatics and Decision Making (2019) 19:102 Page 3 of 11 were collapsed into one category (anxiolytics-hypno- collapsing “ study” and “extensive” to aquire the following tics) based on the assumption that the two categories levels (from low to high); “theoretical”, “case”,or“study”. have comparable adverse effects among nursing home The first ranked PI in each patient was defined by the fol- patients. Antiepileptics are increasingly prescribed for lowing hierarchy of categories and levels; recommended psychiatric indications in Norway, and epilepsy increases action (avoid > monitor or adjust dose > informative) > with age [17]. Of relevance for inappropriate prescribing documentation (study > case > theoretical) > severity (se- of psychotropics, data concerning all prescribed psycho- vere > moderate > mild). The order of the categories were tropics (regularly prescribed and additional drugs as based on our experience that many PIs may be described needed) were included [18]. Concurrent use of psychotro- as potentially severe, but recommended action (e.g. con- pics from a similar ATC category is not uncommon in traindicated) and documentation
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