Does co-payment for inhaler devices affect therapy adherence and disease outcomes? A historical, matched cohort study

Methods to assess COPD medications adherence in healthcare databases: a systematic review

BACKGROUND

The Global Initiative for Chronic Obstructive Lung Disease 2023 report recommends medication adherence assessment in COPD as an action item. Healthcare databases provide opportunities for objective assessments; however, multiple methods exist. We aimed to systematically review the literature to describe existing methods to assess adherence in COPD in healthcare databases and to evaluate the reporting of influencing variables.

METHOD

We searched MEDLINE, Web of Science and Embase for peer-reviewed articles evaluating adherence to COPD medication in electronic databases, written in English, published up to 11 October 2022 (PROSPERO identifier CRD42022363449). Two reviewers independently conducted screening for inclusion and performed data extraction. Methods to assess initiation (dispensing of medication after prescribing), implementation (extent of use over a specific time period) and/or persistence (time from initiation to discontinuation) were listed descriptively. Each included study was evaluated for reporting variables with an impact on adherence assessment: inpatient stays, drug substitution, dose switching and early refills.

RESULTS

160 studies were included, of which four assessed initiation, 135 implementation and 45 persistence. Overall, one method was used to measure initiation, 43 methods for implementation and seven methods for persistence. Most of the included implementation studies reported medication possession ratio, proportion of days covered and/or an alteration of these methods. Only 11% of the included studies mentioned the potential impact of the evaluated variables.

CONCLUSION

Variations in adherence assessment methods are common. Attention to transparency, reporting of variables with an impact on adherence assessment and rationale for choosing an adherence cut-off or treatment gap is recommended.

Determining factors associated with inhaled therapy adherence on asthma and COPD: A systematic review and meta-analysis of the global literature

BACKGROUND

Adherence to therapy has been reported worldwide as a major problem, and that is particularly relevant on inhaled therapy for Asthma and Chronic Obstructive Pulmonary Disease (COPD), considering its barriers and features. We reviewed the global literature reporting the main determinants for adherence on these patients.

METHODS

Searches were made using the Cochrane Library, MEDLINE, EMBASE and ISI Web of Science databases. Analytical, observational and epidemiological studies (cohort, case-control and cross-sectional studies) were included, reporting association between any type of determinant and the adherence for inhaler therapy on Asthma or COPD. Random-effects meta-analysis were used to summarise the numerical effect estimates.

RESULTS

47 studies were included, including a total of 54.765 participants. In meta-analyses, the significant determinants of adherence to inhaled therapy were: older age [RR = 1.07 (1.03-1.10); I² = 94; p < 0.0001] good disease knowledge/literacy [RR = 1.37 (1.28-1.47); I² = 14; p = 0.33]; obesity [RR = 1.30 (1.12-1.50); I² = 0; p = 0.37]; good cognitive performance [RR = 1.28 (1.17-1.40); I² = 0; p = 0.62]; higher income [RR = 1.63 (1.05-2.56); I² = 0; p = 0.52]; being employed [RR = 0.87 (0.83-0.90); I² = 0; p = 0.76] and using multiple drugs/inhalers [RR = 0.81 (0.79-0.84); I² = 0; p = 0.80]. Overall, the strength of the underlying evidence was only low to moderate.

CONCLUSIONS

Many determinants may be associated to patient's adherence, and personalised interventions should be taken in clinical practice to address it by gaining an understanding of their individual features.

Factors affecting the choice of therapeutic regimens in asthma and chronic obstructive pulmonary disease patients and patient adherence to the therapies prescribed

Introduction

Chronic obstructive pulmonary disease (COPD) and asthma are the most common chronic respiratory diseases worldwide. At the moment, there is no information about the preferences of Polish specialists as regards the treatment of asthma and COPD or factors influencing the choice of particular treatment regimens.

Aim

To determine the treatment options most commonly used by experienced pulmonologists and allergists for asthma and COPD and to identify the factors affecting the choice of a particular therapy.

Material and methods

The survey included 224 doctors (pulmonologists and allergists) across Poland and concerned patients diagnosed with asthma (n = 4358) and COPD (n = 3062).

Results

In the case of asthma, the most common therapy applied was inhaled glucocorticosteroids and long-acting β₂ agonists. According to 27.2% of doctors, combination therapy was used in 70–80% of patients while 23.7% declared that the proportion of patients receiving such a treatment exceeded 80%. In the case of COPD, anticholinergics were most frequently prescribed when inhaled glucocorticosteroids and long-acting β₂ agonists had proved insufficient. According to 21% of specialists, the percentage of patients treated so was 41–50%, while 19% declared the use of this treatment in 71–80% of patients.

Conclusions

The most common treatments for asthma and COPD in Poland are inhaled glucocorticosteroids and long-acting β₂ agonists. The main factors influencing treatment decisions are the current GINA and GOLD recommendations as well as patients’ age, comorbidities, and price of treatment.