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- Cars, Thomas, 1975-
(author)
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Real-Time Monitoring of Healthcare Interventions in Routine Care : Effectiveness and Safety of Newly Introduced Medicines
- 2016
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Doctoral thesis (other academic/artistic)abstract
- Before market authorization of new medicines, their efficacy and safety are evaluated using randomized controlled trials. While there is no doubt about the scientific value of randomized trials, they are usually conducted in selected populations with questionable generalizability to routine care. In the digital data revolution era, with healthcare data growing at an unprecedented rate, drug monitoring in routine care is still highly under-utilized. Although many countries have access to data on prescription drugs at the individual level in ambulatory care, such data are often missing for hospitals. This is a growing problem considering the clear trend towards more new and expensive drugs administered in the hospital setting. The aim of this thesis was therefore to develop methods for extracting data on drug use from a hospital-based electronic health record system and further to build and evaluate models for real-time monitoring of effectiveness and safety of new drugs in routine care using data from electronic health records and regional and national health care registers.Using the developed techniques, we were able to demonstrate drug use and health service utilization for inflammatory bowel disease and to evaluate the comparative effectiveness and safety of antiarrhythmic drugs.With a rapidly evolving drug development, it is important to optimize the evaluation of effectiveness, safety and health economic value of new medicines in routine care. We believe that the models described in this thesis could contribute to fulfil this need.
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| 2. |
- Norberg, Helena, 1984-
(author)
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Bridging the gap between clinical trials and clinical practice : sacubitril-valsartan in heart failure as a model
- 2020
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Doctoral thesis (other academic/artistic)abstract
- When novel treatments prove more effective than standard therapies, a swift and effective implementation is needed to reach cost-effectiveness and to benefit eligible patients. Meanwhile, women and elderly are often under-represented in clinical trials, which creates a knowledge gap on how to optimize treatment in clinical practice. The arrival of the angiotensin receptor-neprilysin inhibitor sacubitril-valsartan to patients with chronic heart failure and reduced ejection fraction (HFrEF) offered an opportunity to develop and test a new systematic introduction approach, as well as to investigate eligibility and management of sacubitril-valsartan in clinical practice. The aims of this thesis were to investigate obstacles to implement sacubitril-valsartan in a real-world heart failure population, as well as to develop a systematic and effective method to implement novel treatments in patients with chronic disease.With an observational cross-sectional study design, patients were retrospectively included if they had a heart failure diagnosis, living within the Umeå University Hospital catchment area, and had at least one visit at the Heart Centre or Department of internal medicine between January 2010 and March 2016. Eligibility to sacubitril-valsartan was based on the enrollment criteria applied in the landmark trial, PARADIGM-HF. We showed that the primary obstacle to implement sacubitril-valsartan was that only a quarter of the real-world HFrEF population was eligible. The most prominent difference was that real-world patients were significantly older compared with the PARADIGM-HF population. Disproportionally many patients, especially women, were ineligible for sacubitril-valsartan due to intolerance of renin-angiotensin system inhibitors in target doses. With multivariable linear regression analyses, we showed that the lower target doses in women were explained by biological sex differences.Management of heart failure treatment involve many titration steps that risk stressing the resources of both healthcare and patients. We prospectively investigated a direct switch to maximum dose sacubitril-valsartan in patients who tolerated target dose renin-angiotensin system inhibitors (equivalent to enalapril 10 mg twice daily). We showed that the simplified introduction was safe and generally well tolerated during the first year.The systematic introduction approach is a seven-step procedure:1) define a few main criteria2) primary scan patients with the one or two main criteria using computerized medical records/databases/clinical registries3) identify patients applying the other predefined criteria4) evaluate if any examinations/laboratory test updates are required5) summon identified patients with an information letter6) discuss treatment with the patient and prescribe if appropriate7) follow-up on initiated therapy and evaluate the process.We evaluated the approach with a mixed method, including both a case study of the sacubitril-valsartan implementation and an interview study with qualitative content analysis. The new systematic introduction approach effectively implemented sacubitril-valsartan in clinical practice, by identifying eligible patients with limited resources and time. The patients were overall satisfied with the new approach and their confidence in healthcare was maintained.In conclusion, we found that the strict inclusion criteria in the PARADIGM-HF trial would exclude a majority of patients with heart failure if they are implemented and that these criteria have an inherent bias versus the old and the frail, which in turn disproportionately affects women. We further found that patients who are on maximum recommended dose of renin-angiotensin system inhibitors can be safely switched to maximum dose sacubitril-valsartan and that our method of systematic introduction was effective in implementing sacubitril-valsartan to a heart failure population.The approach is a promising example of how to reduce the gap between clinical trials and clinical practice in patients with chronic disease.
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| 3. |
- Sjölander, Maria, 1970-
(author)
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Use of secondary preventive drugs after stroke
- 2013
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Doctoral thesis (other academic/artistic)abstract
- Background Stroke is a serious condition that can have significant impact on an individual’s health and is a significant burden on public health and public finances. Secondary preventive drug treatment after stroke is important for decreasing the risk of recurrent strokes. Non-adherence to drug treatment hampers the treatment effect, especially in long-term preventive treatments. The aim of this thesis was to study the use of secondary preventive drugs after stroke among Swedish stroke patients in terms of inequalities in implementation in clinical practice and patient adherence to treatment over time.Methods Riks-Stroke, the Swedish stroke register, was used to sample stroke patients and as a source of information on background characteristics and medical and health care-related information including information on prescribed preventive drugs. The patients that were included had a stroke between 2004 and 2012. Individual patient data on prescriptions filled in Swedish pharmacies were retrieved from the Swedish Prescribed Drug Register and used to estimate patient adherence to drug treatment. Data on education, income, and country of birth were included from the LISA database at Statistics Sweden. A questionnaire survey was used to collect information about patients’ perceptions about stroke, beliefs about medicines, and self-reported adherence.Results Results showed that a larger proportion of men than women were prescribed statins and warfarin after stroke. There was also a social stratification in the prescribing of statins. Patients with higher income and a higher level of education were more likely to be prescribed a statin compared to patients with low income and low level of education. Statins were also more often prescribed to patients born in Nordic countries, Europe, or outside of Europe compared to patients born in Sweden. Primary non-adherence (not continuing treatment at all within 4 months of discharge from hospital) was low for preventive drug treatment after stroke. Data on filled prescriptions, however, indicated that the proportion of patients who continued to use the drugs declined during the first 2 years after stroke. For most drugs, refill adherence in drug treatment was associated with female sex, good self-rated health, and living in institutions and (for antihypertensive drugs and statins) having used the drug before the stroke. For statins and warfarin, a first-ever stroke was also associated with continuous drug use. Self-reported adherence 3 months after stroke also showed associations with patients’ personal beliefs about medicines; non-adherent patients scored higher on negative beliefs and lower on positive beliefs about medicines.Conclusion Inequalities between men and women and between different socioeconomic groups were found in the prescribing of secondary preventive drugs after stroke. Only a small proportion of Swedish stroke patients did not continue treatment after discharge from hospital, but the proportion of non-adherent patients increased over time. Poor adherence to preventive drug treatment after stroke is a public health problem, and improving adherence to drug treatment requires consideration of patients’ personal beliefs and perceptions about drugs.
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