Potentially Inappropriate Proton-Pump Inhibitor Prescription in The
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TAG0010.1177/1756284821998928Therapeutic Advances in GastroenterologyL Muheim, A Signorell 998928research-article20212021 Therapeutic Advances in Gastroenterology Original Research Ther Adv Gastroenterol Potentially inappropriate proton-pump 2021, Vol. 14: 1–10 DOI:https://doi.org/10.1177/1756284821998928 10.1177/ inhibitor prescription in the general 1756284821998928https://doi.org/10.1177/1756284821998928 © The Author(s), 2021. Article reuse guidelines: population: a claims-based retrospective sagepub.com/journals- time trend analysis permissions Leander Muheim , Andri Signorell, Stefan Markun, Corinne Chmiel, Stefan Neuner-Jehle, Eva Blozik, Pascale Ursprung, Thomas Rosemann and Oliver Senn Abstract Background: Proton-pump inhibitors (PPI) are among the most prescribed drugs worldwide, and a large body of evidence raises concerns about their inappropriate use. Previous estimates of inappropriate use varied due to different definitions and study populations. Aims: We aimed to measure the population-based incidence and time trends of PPI and potentially inappropriate PPI prescriptions (PIPPI) with a novel method, continuously assessing excessive cumulative doses based on clinical practice guidelines. We also assessed association of patient characteristics with PPI prescriptions and PIPPI. Methods: This was an observational study based on a large insurance claims database of persons aged >18 years with continuous claims records of ⩾12 months. The observation period was January 2012 to December 2017. We assessed the incidence and time trends of PPI prescriptions and PIPPI based on doses prescribed, defining ⩾11.5 g of pantoprazole dose equivalents during any consecutive 365 days (average daily dose >31 mg) as inappropriate. Results: Among 1,726,491 eligible persons, the annual incidence of PPI prescriptions increased from 19.7% (2012) to 23.0% (2017), (p = <0.001), and the incidence of PIPPI increased from 4.8% (2013) to 6.4% (2017), (p = <0.001). Age, male gender, drugs with bleeding risk and multimorbidity were independent determinants of PIPPI (p = <0.001 for all). Conclusions: This study provides evidence that one of the most prescribed drug groups is commonly prescribed inappropriately in the general population and that this trend is increasing. Multimorbidity and drugs with bleeding risks were strong determinants of PIPPI. Addressing PPI prescriptions exceeding guideline recommendations could reduce polypharmacy and improve patient safety. Correspondence to: Leander Muheim Institute of Primary Care, University of Zurich and Keywords: inappropriate, overuse, PPI, proton-pump inhibitors, polypharmacy University Hospital Zurich, Pestalozzistrasse 24, Zurich, 8091, Switzerland Received: 22 January 2021; revised manuscript accepted: 9 February 2021. [email protected] Andri Signorell Eva Blozik Introduction growing. Both potential side effects3–5 and poten- Department of Health Sciences, Helsana Group, Proton-pump inhibitors (PPI) are highly effective tially unnecessary expenditures6–8 are of increas- Switzerland antacid drugs1 and are among the most com- ing interest. Many initiatives and professional Stefan Markun Corinne Chmiel monly prescribed drugs worldwide. Pantoprazole, societies advise against the prolonged use of Stefan Neuner-Jehle one of the most popular examples, is the single PPI.9,10 Pascale Ursprung Thomas Rosemann most prescribed generic drug and generates the Oliver Senn highest overall generic drug cost in Switzerland.2 From a patient- and health-economics perspec- Institute of Primary Care, University of Zurich and As the use of PPI has been steadily increasing, tive, excessive average long-term doses seem most University Hospital Zurich, concerns about their inappropriate use have been relevant, as higher cumulative doses of PPI might Zurich, Switzerland journals.sagepub.com/home/tag 1 Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage). Therapeutic Advances in Gastroenterology 14 produce more side effects3 and cause more unnec- Objectives essary costs. We defined our main objectives as follows: Yet inappropriate use of PPI remains widespread 1. Incidence of PPI prescriptions and time and is still increasing, as multiple studies in vari- trends thereof (period 2012–2017) ous settings show.11–14 Many previous estimates 2. Incidence of PIPPI and time trends of potentially inappropriate PPI prescriptions thereof (period 2013–2017, PIPPI is (PIPPI) are highly variable, but do not define defined as a result of the preceding year) inappropriateness based on continuous and 3. Association of patient characteristics cumulative doses prescribed on the patient with PIPPI (demographic characteristics, level.11,13 Accordingly, considerable uncertainty drugs with bleeding risk and number of remains about the valid extent of PIPPI within chronic conditions) in comparison to PPI the population. prescriptions Aims Assessment of proton-pump inhibitor We aimed to measure the population-based inci- prescribing dence and time trends of PPI prescriptions and The insurance claims cover all pharmacy and PIPPI by means of a novel method, which con- physician invoices of prescription drugs. PPI were tinuously assesses excessive cumulative doses identified by Anatomical Therapeutic Chemical based on clinical practice guidelines. We also (ATC) Classification codes A02BC. Incidence of assessed association of patient characteristics with PPI prescriptions was defined by any such pre- PIPPI in comparison to PPI prescriptions. scription during any calendar year. All health care invoices submitted to Helsana for reimbursement during the study period were considered. Methods Prescribed PPI doses of the various PPI products were converted into pantoprazole dose equivalents, Study design, data source and population thus referencing the most commonly prescribed In this retrospective analysis, we used claims PPI product in Switzerland. In an attempt to esti- data of a major Swiss health insurance company mate PPI prescribing in the context of clinical (‘Helsana group’) covering approximately 14% practice in Switzerland, doses of all the PPI agents of the Swiss population.15 All persons registered on the market were labelled as either maintenance in Switzerland are obliged by law to contract or therapeutic dose and then translated into pan- basic health insurance. Individuals who cannot toprazole dose equivalents of 20 mg and 40 mg, afford to pay the monthly premiums receive respectively. Detailed definitions of the various subsidies or full insurance coverage by their pantoprazole dose equivalents are listed under social services. Equal access to the full range of Supplemental Material (1). medical treatments including drugs is thereby granted to everyone, regardless of insurance status. Lower monthly premiums are available Definition and assessment of potentially when choosing different deductible schemes. inappropriate proton-pump inhibitor prescribing Deductibles range from 300 to 2500 Swiss Based on a literature review covering 34 clinical Francs (CHF) yearly. In addition, optional practice guidelines in 2017, we extracted PPI alternative health plans (managed care, tele- dosage and treatment regimens on 57 different medicine gatekeeping and others) enable lower PPI indications.16 Thereof we derived a 365-day monthly premiums. cumulative pantoprazole dose equivalent of 11.5 g as a cut-off for inappropriateness. This cut-off Our sample includes persons aged 18 or older reflects an evidence-based maximal-dose sce- whose records were available for at least 12 months nario, based on three hypothetical sequential from 1 January 2012 through 31 December 2017. phases: (1) an 8-week double-dose therapeutic Prescriptions of implausibly high cumulative treatment phase (2 × 40 mg of pantoprazole dose doses were excluded. equivalents, i.e. for severe erosive esophagitis), 2 journals.sagepub.com/home/tag L Muheim, A Signorell et al. (2) a 4-week tapering to a therapeutic dose calendar year as the denominator. In addition, (1 × 40 mg), (3) a maintenance dose (1 × 20 mg) the incidence of PIPPI among the incidental PPI for the remainder of the year. The resulting prescription group was calculated. Percentages cumulative yearly dose of 11.2 g of pantoprazole and mean values were used to describe categori- equivalents was rounded up to 11.5 g. PIPPI was cal and nominal data, respectively. Descriptive then determined by screening every observed per- statistics were used to provide characteristics of son day for a preceding 365-day cumulative dose all patients with PPI prescriptions. These data exceeding 11.5 g. To clarify we give a practical were grouped into PPI prescriptions (i.e. non- example: if 100 tablets pantoprazole 40 mg were PIPPI) and PIPPI groups. Chi-Squared tests for dispensed 1 December 2016, this corresponded trend in proportions were used to analyse changes to 4000 mg added to the balance sheet of one in proportions of PPI prescriptions and PIPPI patient. If the same patient repeated this process incidence. For bivariate comparisons between the twice (i.e. adding another 8000 mg and therefore PPI prescriptions and PIPPI groups, Kruskal– 12,000