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      Patient Preference and Adherence (submit here)

      This international, peer-reviewed Open Access journal by Dove Medical Press focuses on the growing importance of patient preference and adherence throughout the therapeutic process. Sign up for email alerts here.

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      Non-adherence to inhaled corticosteroids and the risk of asthma exacerbations in children

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          Abstract

          Background

          Non-adherence to inhaled corticosteroids (ICSs) is a major risk factor for poor asthma control in children. However, little is known about the effect of adherence to ICS on the incidence of asthma exacerbations. The objective of this study was to examine the effect of poor adherence to ICS on the risk of exacerbations in children with asthma.

          Methods

          In this nested case–control study using data from the Dutch PHARMO Record Linkage System, children aged 5–12 years who had an asthma exacerbation needing oral corticosteroids or hospital admission were matched to patients without exacerbations. Refill adherence was calculated as medication possession ratio from ICS-dispensing records. Data were analyzed using a multivariable multiplicative intensity regression model.

          Results

          A total of 646 children were included, of whom 36 had one or more asthma exacerbations. The medication possession ratio was 67.9% (standard deviation [SD] 30.2%) in children with an exacerbation versus 54.2% (SD 35.6%) in the control group. In children using long-acting beta-agonist, good adherence to ICS was associated with a higher risk of asthma exacerbations: relative risk 4.34 (95% confidence interval: 1.20–15.64).

          Conclusion

          In children with persistent asthma needing long-acting beta-agonist, good adherence to ICS was associated with an increased risk of asthma exacerbations. Possible explanations include better motivation for adherence to ICS in children with more severe asthma, and reduced susceptibility to the consequences of non-adherence to ICS due to overprescription of ICS to children who are in clinical remission. Further study into the background of the complex interaction between asthma and medication adherence is needed.

          Most cited references31

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          Medication adherence and the risk of severe asthma exacerbations: a systematic review.

          The benefits of drug therapy for asthma have been well established, but adherence to treatment is poor, and this might be associated with an increased risk of asthma exacerbations. The aim of this study was to review the literature on the association between adherence to asthma controller treatment and risk of severe asthma exacerbations in children and adults. A systematic literature search was performed in PubMed, Embase and Web of Science, from inception until January 2014. Studies were included if data on the association between medication adherence and severe asthma exacerbations were presented. Quality was assessed using a modified version of the Newcastle-Ottawa Scale. The search yielded 2319 unique publications, of which 23 met the inclusion criteria and underwent data extraction and quality scoring. High levels of heterogeneity across studies with regard to adherence and exacerbation measurements, designs and analysis precluded a formal meta-analysis. Although effect measures varied widely, good adherence was associated with fewer severe asthma exacerbations in high-quality studies. Good adherence tended to be associated with lower risk of severe asthma exacerbations. Future studies should use standardised methodology to assess adherence and exacerbations, and should consider inhaler competence.
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            Nonparametric Inference for a Family of Counting Processes

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              Validation of patient reports, automated pharmacy records, and pill counts with electronic monitoring of adherence to antihypertensive therapy.

              To evaluate the validity of patient report, pharmacy dispensing records, and pill counts as measures of antihypertensive adherence using electronic monitoring as the validation standard. The study was conducted among 286 members of Harvard Pilgrim Health Care, a managed care organization, who were at least 18 years of age, on monotherapy for hypertension, and had prescription drug coverage. Prescription refill adherence during the 12 months before enrollment was determined from their automated pharmacy dispensing records. Participants were interviewed about their medication adherence before and after a 3-month electronic monitoring period during which pill counts were also performed. Adherence to both recommended number and timing of doses was estimated from electronic monitoring data. Data analysis was based on statistical correlation and analysis of variance. Electronic adherence monitoring revealed that the proportion of prescribed doses consumed was higher (0.92) than the proportion of doses taken on time (0.63). The correlation between adherence to quantity and timing of doses was 0.32. Concurrent pill counts and earlier refilling patterns were moderately correlated with electronic monitoring (pill count: r = .52 with quantity and r = .17 with timing; refill adherence r = .32 with quantity and r = .22 with timing). There was considerable misclassification of adherence reported by patients, although nonadherence was generally accurately reported. Deviation from recommended timing of doses appears to be greater than from prescribed number of doses. Pharmacy dispensing records demonstrate predictive validity as measures of cumulative exposure and gaps in medication supply. Adherence levels determined from pill counts and pharmacy dispensing records correlate more closely with quantity than with timing of doses. Nonadherence reported by patients can serve as a qualitative indicator and predictor of reduced adherence.
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                Author and article information

                Journal
                Patient Prefer Adherence
                Patient Prefer Adherence
                Patient Preference and Adherence
                Patient preference and adherence
                Dove Medical Press
                1177-889X
                2016
                12 April 2016
                : 10
                : 531-538
                Affiliations
                [1 ]Erasmus University Medical Center, Department of Hospital Pharmacy, Rotterdam, the Netherlands
                [2 ]Division of Pharmacoepidemiology and Clinical Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, the Netherlands
                [3 ]NIVEL, Utrecht, the Netherlands
                Author notes
                Correspondence: Patricia MLA van den Bemt, Erasmus University Medical Center, Department of Hospital Pharmacy, Nc-212, PO Box 2040, 3000 CA Rotterdam, the Netherlands, Tel +31 10 703 3202, Fax +31 10 703 2400, Email p.vandenbemt@ 123456erasmusmc.nl
                Article
                ppa-10-531
                10.2147/PPA.S92824
                4835125
                27110103
                52ae8911-7a08-4513-bbe5-0a689a854d22
                © 2016 Vasbinder et al. This work is published and licensed by Dove Medical Press Limited

                The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License ( http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

                History
                Categories
                Original Research

                Medicine
                asthma exacerbation,children,database,inhaled corticosteroids,refill adherence pharmacoepidemiology,observational study,the netherlands

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