Geographical variation in glaucoma prescribing trends in England 2008-2012: an observational ecological study

Inferring glaucoma status from prescriptions, diagnoses, and operations data: A Danish nationwide study

PURPOSE

To assess a new method for inferring glaucoma status using prescriptions data.

METHODS

The study population comprised all individuals living in Denmark in the period 1995 to 2018 and included 6,930,571 individuals. We used information from The National Prescription Registry on claimed prescriptions as the basis for our study (N = 223,592). We inferred glaucoma status using data on claimed prescriptions, in-hospital ICD-10 diagnoses, and in-hospital glaucoma surgeries. We infer glaucoma status in three ways using the prescription pattern: glaucoma inferred by (i) the use of a first claimed prescription, (ii) the use of a second claimed prescription with a gap of at least 90 days, and (iii) the use of a third claimed prescription for glaucoma medication, again with a gap of at least 90 days between prescriptions. Furthermore, we compared the results with alternative indications for glaucoma, namely in-hospital ICD-10-diagnosed glaucoma and in-hospital glaucoma surgery.

RESULTS

We first determined that glaucoma status could be inferred from claimed prescription data and found that a single claimed prescription was highly correlated with the more restricted composite measure of glaucoma (R2 = 0.80, p <0.0001), with a kappa coefficient of 80%. Focusing on individuals with a confirmed in-hospital glaucoma diagnosis, we found a high sensitivity of 88% using anti-glaucomatous prescriptions as a surrogate marker for primary open-angle glaucoma (POAG). We then derived several descriptive insights. The prevalence of glaucoma increased during the period from 1996 to 2018, while the incidence was constant. We also found a decreasing trend in the ratio of the number of people diagnosed annually in hospitals to the number of people filling prescriptions. This indicated a relative increase in the number of patients treated or managed in the secondary sector. Finally, using data on diagnoses and claimed prescriptions, we found that the proportion of total noncompliant patients, i.e., patients who do not claim their prescription at any time in the study period (two decades) was at most 11.8%. This share is calculated on the basis of diagnosed patients who did not have surgery. The results was not sensitive to the glaucoma inference rule.

CONCLUSION

Anti-glaucomatous medicine prescriptions can be used to infer glaucoma status, with useful implications for epidemiological research. The sensitivity is particularly high for primary open-angle glaucoma (POAG).

Nation-Wide Analysis of Glaucoma Medication Prescription in Fiscal Year of 2019 in Japan

To report the updated prescription trend of antiglaucoma medications, the dose-based prescription of a glaucoma medication in Japan in the fiscal year 2019 was aggregated by using the National Database of Health Insurance Claims and Specific Health Checkups of Japan (NDB) Open data. Of the 100 most frequently prescribed topical medications for outpatients from out-hospital pharmacies, 32 glaucoma medications were identified. This year, 150.8 million ml of glaucoma medications prescribed accounted for 12.3% of the total prescription dose (1.3 billion ml). The dose was the largest with prostaglandin FP2α agonist (PGF2α), followed by the fixed-dose combination (FDC) of β-blocker and carbonic anhydrase inhibitor (β + CAI) and α2-agonist. Prescription doses peaked at 75−79 years old for all medication classes, except for prostaglandin EP2 agonist of that peaked 10 years younger age class than other medications. The prescription dose was larger in women (55.3%) than men (44.7%), single medication formulation (71.2%) than FDC (28.8%), and brand-name (85.2%) than generic (14.8%). By multivariate analysis, prescription doses were affected by roles of the sex (p = 0.0066) and brand-name or generic (p = 0.032), but not by single medication formulation or FDC (p = 0.67); age was the most remarkable parameter for the difference in prescription dose (p < 0.0001). Dose-based anti-glaucoma medication prescription was analyzed using the government-provided most recent database on a national scale. The results provide the up-to-date real-world glaucoma medication prescriptions where the country has the highest aging rate in the world.

The future is old - Patients with topical ocular hypotensive treatment in the Nordic region between 2008 and 2017 with projections for 2040

PURPOSE

The primary objective was to evaluate prescribing trends for topical ocular hypotensive treatment in the Nordic region during the last decade and, by population projections, estimate the glaucoma burden in 2040. A secondary objective was to analyse national variations in prescription patterns across the Nordic region.

METHODS

A retrospective analysis of national pharmacy data between 2008 and 2017 on the dispensation of topical ocular hypotensive treatment in the Nordic region was performed. Predictions of the glaucoma burden in 2040 were calculated from official population projections.

RESULTS

The total number of patients with ocular hypotensive treatment in the Nordic region increased from 346 000 to 418 000 (21%) between 2008 and 2017. The number of patients with ocular hypotensive treatment in the age group of 50 years and older increased from 3.6% to 3.9%. The daily defined dose (DDD) per patient and day during the study period increased from 1.22 to 1.26. Adjusted for beta-blocker combinations, the same value increased from 1.49 to 1.67. Across the Nordic countries, Finland had almost twice as many DDD per patient and day in 2017 (2.1) compared with Iceland (1.1). Between 2008 and 2017, the annual treatment cost for ocular hypotensive treatment in the Nordic region decreased from 96 million to 87 million Euro (-9%). In 2040, the number of patients with ocular hypotensive treatment in the Nordic region is estimated to 633 000 individuals (+51% compared with 2017).

CONCLUSIONS

The study revealed an increased use of glaucoma medications in the Nordic region the last decade. This was mainly caused by an increased number of patients with ocular hypotensive treatment, but also because of a more intensive treatment. Marked national differences were detected. Due to the introduction of generic medications, the total cost for ocular hypotensive treatment did however decrease during the last decade. In 2040, the current number of individuals with ocular hypotensive treatment is estimated to have increased with an additional 50% due to a growing number of ageing individuals. This will lead to higher costs, not only for medications but also for diagnosing, monitoring and other aspects of glaucoma care.

GlaucoMap - Distribution of Glaucoma Surgical Procedures in the United States

PURPOSE

To understand the distribution of trabeculectomies, glaucoma drainage implants (GDI) and micro-invasive glaucoma surgeries (MIGS) performed in the United States through geospatial mapping.

METHODS

We performed an observational cohort study to evaluate glaucoma surgeries in patients age ≥65. The most recently released data from Centers for Medicare Part B Carrier Summary Files were queried to determine the number of glaucoma surgeries performed per state during the year of 2017. We created choropleth maps, titled "GlaucoMap", to characterize the rates of various surgeries performed across the United States, defined as the number of procedures performed per 10,000 individuals. A chi-squared analysis was further used to evaluate differences in surgical preferences across geographic region. Standardized residuals (SR) were calculated to determine regional influences on surgical distribution.

RESULTS

There were 174,788 glaucoma surgeries performed: 22,862 trabeculectomies (13.1%), 19,991 GDI (11.4%) and 131,935 (75.5%) MIGS. The Northeast had the highest trabeculectomy rate, GDI was highest in the Southeast and MIGS were highest in the Southwest. There was a statistically significant difference in proportional use of conventional surgeries versus MIGS across various regions in the United States (p < 0.0001). Given the high trabeculectomy and GDI rates and relatively low MIGS adoption in the Southeast, we observed a +7.03 SR for conventional surgeries and -4.01 SR for MIGS. The Southwest and Western states had the highest MIGS rate and contributed +3.29 and +3.24 SR toward disproportional MIGS preference, respectively. The preference for conventional surgeries in the Northeast (SR = +2.93) and MIGS in the Midwest (SR = +0.99) also contribute to the overall differences in glaucoma surgeries across the United States.

CONCLUSION

GlaucoMap is useful for visualizing the distribution of glaucoma surgeries in the United States. The heterogeneity in surgical preferences points to regional differences in glaucoma management.

Prescribing trends of glaucoma drugs in six major cities of China from 2013 to 2017

OBJECTIVE

To evaluate the prescribing trends of glaucoma drugs in six major cities of China from 2013 to 2017.

METHODS

A descriptive analysis using pharmacy prescription data was conducted. Outpatient prescription data was extracted from the Hospital Prescription Analysis Cooperative Project. Prescribing patterns, trends of visits, and corresponding expenditures for glaucoma medications were analyzed.

RESULTS

A total of 84297 ambulatory prescriptions were included in the current study. Visits by glaucoma patients increased from 13808 in 2013 to 20060 in 2017. Over the same period, the yearly expenditure for glaucoma drugs increased from 2.33 million to 3.95 million Chinese Yuan (CNY). Among all the six classes of glaucoma drugs (prostaglandin analogues, carbonic anhydrase inhibitors, α-receptor agonists, β-receptor antagonists, cholinergic agonists and fixed combinations), β-receptor antagonists were the most commonly prescribed in 2013, accounting for 34.3% of patients, but gradually decreased to 27.1% in 2017. Prostaglandin analogues became the most frequently prescribed drugs in 2017, accounting for 30.2% of the visits. Prostaglandin analogues are the most expensive and yielded a total expenditure of 2.34 million CNY in 2017, followed by carbonic anhydrase inhibitors, α-receptor agonists, β-receptor antagonists, fixed combinations, and cholinergic agonists. Combination therapy became increasingly prescribed in 2017.

CONCLUSION

Glaucoma prescribing practices exhibited substantial changes over the study period. The number of glaucoma prescriptions continuously increased from 2013 to 2017, leading to increased prescription costs. These findings implied a similar trend observed in previous studies, as well as recommendations in the appropriate guidelines.

Inequalities in prescription rates of anti-osteoporosis drugs in primary care in England: A practice-level prescribing data analysis in 2013-2018

OBJECTIVE

To investigate potential variations in prescription rates of anti-osteoporosis drugs at the general practitioner (GP) practice level in England, analysing associations of prescription rates with key demographic and socio-economic variables, and its evolution over time.

METHODS

A retrospective database analysis was conducted using prescription data from all GP practices in England between April 2013 and September 2018. Potential associations between prescription rates and other variables (sex, age, ethnicity, rural-urban classification and income deprivation) were analysed using mixed-effects Poisson regressions and concentration indices.

RESULTS

Alendronic acid was the most frequently prescribed anti-osteoporosis drug. Exploratory and regression analyses showed the association between GP prescriptions and the characteristics of the population they serve. Income deprivation had a statistically significant and negative effect on prescription levels of alendronic acid, denosumab, ibandronic acid and risedronate sodium. Since 2013, denosumab prescriptions exhibited a steep surge in the least income-deprived areas, compared with a modest rise in the most income-deprived areas. Concentration indices indicated a disproportionate concentration of denosumab and, to a lesser extent, ibandronic acid prescriptions among the least income-deprived. The analyses demonstrated that different prescribing behaviours may exist across GPs according to the Clinical Commissioning Group (CCG) to which they belong.

CONCLUSIONS

Variation in the prescription of anti-osteoporosis drugs exists across GPs and CCGs in England, this being more prominent for certain drugs (e.g. denosumab) compared with others (e.g. alendronic acid). Inequalities exist in English primary healthcare and we advocate our findings could support the efforts of decision-makers towards a more equitable system.

10-year trends in English primary care glaucoma prescribing

BACKGROUND

In 2018 NHS prescriptions in England cost £8.83 billion. Within ophthalmic prescribing, glaucoma is the most costly indication. The 2017 glaucoma NICE guideline shows there is little evidence for clinical preference of particular molecules within a therapeutic class, yet the cost of these products varies greatly. We aim to describe trends in glaucoma prescribing and its relation to recent NICE Guidance.

METHODS

Prescription cost analyses for England from 2009 to 2018 were reviewed and data concerning items for the treatment of glaucoma were extracted. Costs and prescription frequencies were normalised for inflation and population.

RESULTS

The 2018 cost of glaucoma prescribing was £114.2 million. This cost is 18.1% lower than in 2009 but the annual number of items prescribed per 10,000 people has increased from 1382 to 1668 (20.7%). This is despite an increased prescription of combination drops from 265 to 478 per 10,000 (80.4%). Preservative free item prescriptions rose from 1.7% of total spend in 2009, at £3.4 million in 2009, to 13.9%, in 2018, at £22.5 million. Generic items represented 11.7% of prescriptions in 2009 and 55.2% in 2018. Around half of glaucoma spending is accounted for by the use of preservative free or branded items in the place of the cheapest item in each therapeutic class.

CONCLUSIONS

Glaucoma prescribing costs the NHS a great deal. There is a broad trend to generic prescribing as per recent NICE guidance, but significant further costs could be saved with no robustly evidenced clinical consequence.

Use of Ocular Hypotensive Medications in Portugal: PEM Study: A Cross-sectional Nationwide Analysis

PURPOSE

There is scarcity of European data about intraocular pressure (IOP)-lowering prescribing patterns. We aimed to describe and discuss the nationwide prescription of these medications in Portugal.

MATERIALS AND METHODS

This was a cross-sectional study including all patients who were prescribed at least 1 IOP-lowering medication in 2015 in Portugal. All ocular hypotensive drug prescriptions were gathered from the common electronic drug prescription system used by all hospitals and clinics in Portugal. Demographic data, medications prescribed (number and formulation), physician specialty, and costs of medications were provided in an encrypted and anonymous form. Statistical analyses were performed using STATA.

RESULTS

A total of 231,634 participants (57% women) were prescribed IOP-lowering medications in 2015, representing 4.0% of the population older than 40 years of age and 2.2% of the Portuguese total population. Mean age was 72±13 years. Topical IOP-lowering therapy accounted for a total of 26 million euros (M&OV0556;) in costs, shared between patients and the national health system. General practitioners (GPs) accounted for 52% of all prescriptions. The most prescribed drugs were latanoprost (28%), timolol/dorzolamide (19%), and brimonidine (14%). Among all, 72% of patients were on monotherapy. Compared with ophthalmologists, GPs presented qualitative differences in their prescription pattern, such as a lower proportion of unit dose prescription.

CONCLUSION

A significant percentage of the Portuguese population is currently treated with IOP-lowering medications, and the majority of them are on monotherapy. Although GPs are responsible for most prescriptions, their prescription pattern is different from that of ophthalmologists. This nationwide study revealed prescription patterns and disclosed the burden of the disease in terms of its medical management.