published_or_final_version / Medical Sciences / Master / Master of Medical Sciences

Thesis (MTech. degree in Pharmaceutical Sciences)--Tshwane University of Technology, 2008.

Mental health disorders such as depression and insomnia are prevalent in the community; the use of antidepressants and benzodiazepines is therefore common. However if these medications are not prescribed and used appropriately issues relating to safety and/or efficacy can occur. There is also some concern about the misuse of benzodiazepines by the injecting drug user (IDU) community. The overall aim of this PhD was to perform international utilization comparison studies and analyze national prescribing data to understand and describe factors influencing the use of prescription medicines, in particular antidepressants and benzodiazepines, and to develop some ideas and initiatives to improve future use. Comparisons in the prescribing of benzodiazepines and antidepressants between Nova Scotia, Canada and Australia were undertaken. Dispensing data for all publicly subsidized benzodiazepines and related compounds and antidepressant classes of medications and utilization was compared from 2000-2003, using the World Health Organisation ATC/ DDD system. Australian dispensing data were also used to examine changes in the utilization of antidepressants and benzodiazepines between different age groups within Australia from 2003-2006. Dispensing data and numerical data derived from reports from Australia’s Illicit Drug Reporting System (IDRS) were used to estimate benzodiazepine use by those who inject heroin, in areas with high proportion of persons who inject heroin in Sydney, Melbourne and Brisbane. To determine a strategy aimed at improving the use of benzodiazepines, the literature was searched and the latest interventions, solely focusing on increasing appropriate prescribing and reducing long term use of benzodiazepines worldwide were retrieved and analyzed. The comparison studies showed the use of benzodiazepines increased at a steady but comparable rate in both Australia and Nova Scotia, although overall use was much higher in Nova Scotia than Australia (123 and 48 DDD/1000 beneficiaries/day, respectively). However, the use of antidepressants in Nova Scotia increased at a higher rate than Australia. The variations between the two jurisdictions may be due to the more limited range of benzodiazepines available in Australia, or perhaps different initiatives to control. The differences may also be due to increased exposure to marketing, promotion, education or different prescribing practices in Nova Scotia compared to Australia. From 2003 to 2006, the use of antidepressants increased with age, with those over 65 years having the greatest use (86.9 and 97.7DDD/1000 population/day, respectively). Differences were also seen in the antidepressant most utilized, with the elderly using more tricyclic antidepressants than those who were younger. The utilization of benzodiazepines decreased from 2003-2006 in the same population (66.6 and 61 DDD/1000 concession beneficiaries/day, respectively). However, those over 85 had the highest use of benzodiazepines and used more long acting benzodiazepines than those aged 35-44. This demonstrates that the elderly still account for most use per capita of benzodiazepines. Some of this use may be inappropriate (e.g. use of long-acting benzodiazepines) and hence may provide a useful target for future educational intervention. The elderly also account for the largest per capita use of antidepressants. In areas with a high proportion of heroin IDU, the utilization of benzodiazepines by the estimated IDU population decreased (4064048DDDs in 2000 to 2613100 DDDs in 2006) however the overall use of benzodiazepines in Australia continued to increase from 2000-2006. This demonstrates that the increase in benzodiazepine utilization during this period was not primarily driven by use among IDU. The review identified three main target audiences at which interventions for improving the use of benzodiazepines were aimed at. These were consumers, General Practitioners or long term care facilities. Education, audit and feedback and alerts were the 3 major intervention approaches taken in the studies. The review concluded that studies which used a multi-factorial approach had the largest and most sustained reductions in benzodiazepines use. It appears that support groups for patients, non-voluntary recruitment of GPs, and oral delivery of alerts or feedback may all improve the outcomes of interventions. Using the review findings, an intervention targeting consumers and health professionals was conducted in a rural and urban area of Australia, using informative emails, bookmarks and website over a 6 month period. The intervention showed a significant decrease in the long term use of benzodiazepines within nursing homes located in the intervention geographical areas compared to the control areas. In conclusion the utilization studies revealed the current trends in utilization of antidepressants and benzodiazepines for Australia and led to the development of an intervention, based on factors that were found to influence prescribing of benzodiazepines. The intervention aimed at various target audiences did produce a small improvement in the prescribing of benzodiazepines.

Potentially Inappropriate Prescribing (PIP) is common in Canada yet little is known about its health system costs or which PIPs have the greatest cost impact. This thesis examined the health system costs from hospitalizations, emergency department (ED) visits and medications from all PIP, and for distinct PIP. PIPs were identified in a cohort of older adults in Ontario using a subset of the STOPP/START criteria applicable to health administrative databases, and all analyses were conducted by comparing participants with and without PIP. In study one, the costs from hospitalization, ED visits and newly prescribed medications were identified using population attributable fractions. PIP was identified as responsible for a sizeable portion of all three cost categories, with hospitalization and ED visits costs most highly impacted. Study two compared the incremental costs due to PIP among four distinct PIP criteria selected based on differing frequency and crude costs to validate the use of such characteristics for priority-setting. The crude healthcare costs, as well as the cost of the drug causing the PIP and the frequency of the PIP were identified as likely key characteristics of high-impact PIP. Combined, these studies provide evidence on the overall burden of PIP, while also identifying likely characteristics of high-impact PIP. They suggest interventions at the health system level may be needed to address medication appropriateness and provide information which may be helpful to decision-makers when identifying which PIPs should be targeted for intervention, given no health system level interventions for PIP are currently in place.

Class of 2016 Abstract / Objectives: Analyze electronic prescription errors made by a community health center. Determine the time it takes to correct electronic prescription errors in a community pharmacy. Ascertain whether or not a collaborative practice agreement would be beneficial. Methods: The store computer system was used to generate a report of all prescriptions received at a community pharmacy from a community health center during a 6-month period. Using an Excel sheet, one author kept track of how many electronic prescriptions were received, the number and type of errors, and the time it took to get an error corrected. Results: There were 1896 electronic prescriptions sent from a community health center to a community pharmacy; 61 contained an error (3.24%). On average, it took the doctor’s office 111.7 hours to call back and clarify the mistake. Conclusions: There was not a significant amount of prescribing errors that occurred during the data collection period. However, the time it took for the doctor’s office to call back was significant and translates to patients not being able to get their medications on time.

Magister Pharmaceuticae - MPharm / The objectives of the present study were to describe the type and frequency of prescribing errors and error frequency, to determine the error frequency for different drug classes, to identify potential drug interactions and drug-disease interactions to point out off-label prescribing and to evaluate risk factors of prescribing errors. Methods: This prospective cross sectional study was conducted over a period of 6 months from July 2012 to December 2012 in 2 specialist wards and 2 general medical wards at Red Cross War Memorial Children’s Hospital in Cape Town in South Africa. Only prescriptions generated by doctors in the above mentioned wards were assessed. Convenience sampling was used to select 200 prescription charts for analysis. Information relating to prescribing error, potential drug interaction, potential drug-disease interactions, off-label prescribing and potential risk factors of prescribing error were entered into excel spreadsheet and analysed using STATA versions 11&12. The mass of the patients was converted into weight-for-age z-score (WAZ) using WHO 2006 child growth standards. Univariate analysis and multiple logistic regression were used to identify risk factors of prescribing errors. Results: Of the 200 children on whom prescribing information was analysed, 40 (20%) were severely underweight and a further 25(12.5%) were moderately underweight. A total of 1402 prescribing errors were documented in 1282 drug items prescribed, a rate of 1.09 errors per drug item prescribed. Incomplete prescription information was the most common type of prescribing error, present in 65.6% of all drug items prescribed. The error frequency was high for all drug classes ranging from 57.9% of all respiratory drug items prescribed to 86.4% of all gastro intestinal system drug items prescribed. The number of potential drug-drug interactions was low i.e. 20 potential pharmacodynamics and 49 potential pharmacokinetic drug interactions were identified. The number of potential drug-disease interactions was also low i.e. 39 or 0.03% per drug item prescribed. Furthermore 57 off-label prescribing incidences were recorded. Senior doctors posed a significant risk factor for prescribing errors, an OR 1.95, 95% CI 1.46 – 2.61. Conversely, prescriptions written up in the general wards compared to the specialty wards (an OR 0.65. 95% CI 0.47-0.90) and prescribing during weekends compared to weekdays (an OR 0.71, 95% CI 0.53-0.96) were associated with lower prescribing error risk. Conclusion: This study provided valuable information about prescribing practices in children at RCWMCH. There is a need to improve prescribers’ practice at RCWMCH considering the type of errors observed viz. missing information, use of wrong drug name, abbreviations, legibility concerns and lack of clarity of the prescriptions, among others. Based on this study results further intervention studies are recommended to investigate the level of medical student’s training w.r.t prescribing practice.

Introduction: Palliative care is the approach to the care of patients with life-threatening illnesses. An important part of this is the rational use of a pharmacological approach to relieve suffering by addressing the symptom burden of the patient. Palliative care symptoms contribute a great deal to the suffering of the patient and affects quality of life. Different studies across several countries on the palliative care symptoms have identified common symptoms with pain being the most frequent. The WHO Public Health Strategy for palliative care outlines four components: policy, education, implementation and drug availability. These components interlink and each one affects the others. The drugs used for palliative care symptoms should be classified as essential medicines and be available to all patients who need this treatment. Factors influencing the effective pharmacological management of palliative care symptoms include drug availability, policy and the approach of the prescribers. Studies have shown that developing countries rank low in the use of the essential palliative care drugs especially morphine. Aim: The aim of this study was to describe the prevalence of palliative care symptoms and the prescribing and administration patterns in oncology and haematology patients at PGH, as well as exploring the health workers' opinions on the pharmacological approach to these symptoms. Methods: A mixed method approach was used to qualitatively look at the health workers' responses using inductive thematic analysis and quantitatively obtain information on palliative care symptom management from the health workers and patient records. Results: Pain was the commonest palliative care symptom identified by health workers, and evident in the patient records. A list of other palliative care symptoms, and the frequency at which they occurred was compiled in this study. The health workers highlighted drug availability, palliative care education and need to engage some nurses in prescribing some of the palliative care drugs. Fewer than half of the patient records assessed as being in need of palliative care (N = 247) were given medications from the recognized palliative care drug list (N = 101). Conclusion: This study showed that essential medicines for palliative care symptoms are not easily available in Zimbabwe for various reasons that include cost, policy, education and training. Pain and other palliative care symptoms are not adequately managed. Therefore, palliative care is not yet integrated into the health care system in Zimbabwe as mandated by the WHO. Recommendations to improve palliative care symptom treatment are suggested.

Background. Little is known about longitudinal prescribing practices for psychoactive medications for individuals with intellectual disabilities and developmental disabilities (IDDD) who are living in community settings. Methods. Computerized pharmacy records were accessed for 2344 community-based individuals with IDDD for whom a total of 3421 prescriptions were written during a 17-month period of study. Forty-two psychoactive medications were rank ordered in terms of prescription frequency. Results. Fifty-two per cent (52%) of all prescriptions written during the study period were for psychoactive medications. Anticonvulsant, antipsychotic and antidepressant medications were the most commonly filled prescriptions among psychoactive medications. Sixty per cent (62%) of the study population was given prescriptions for more than one psychoactive medication and 36% received three or more psychoactive medications. During the study period there was a statistically significant increase in prescriptions filled for olanzapine, risperidone, valproic acid, and clonazepam whereas prescriptions filled for thioridazine, haloperidol, and benzotropine showed a significant decline (P < 0.05-0.001). Distribution of psychoactive drug class by age showed that the majority of prescriptions were filled for individuals between 20 and 50 years with the exception of prescriptions for psychostimulants which peaked for individuals prior to 20 years. Conclusions. (1) Analysis of pharmacy billing records provides a method for assessing prescribing patterns of psychoactive medications in community-based individuals with IDDD. (2) Polypharmacy for psychoactive medications is prevalent in this setting. (3) The second-generation antipsychotic medications are prominently represented by an increasing number of filled prescriptions during the study period.

Background: Electronic prescribing systems are designed to aid in the complex process of prescribing by providing patient information and decision support at the point of care. Successful implementation and effectiveness depend on a variety of factors, including usability and user interface design, which influence how the information and decision support are relayed to users. Poorly designed systems have been found to be associated with medication errors. Methods: We conducted a factorial design study to investigate the impact of screen density, highlighting, and placement of information, on the accuracy of prescribing when using an e-prescribing system. Study sessions were held during clinical pharmacology educational rounds, where residents and medical students answered simulated prescribing scenarios presented on various e-prescribing system interface configurations. Assignment of prescribing scenarios to interface configurations and presentation order were randomized between study sessions. Participants were also asked about their preferences for specific user interface configurations. Results: A total of 66 participants completed 844 prescribing cases, with 583 (69%) cases answered correctly. The presence of highlighting was associated with correct prescribing decisions (p-value = 0.001), with 181 out of 250 (72.4%) prescribing scenarios answered correctly on interfaces with highlighting of key clinical information, as opposed to 156 out of 242 (64.5%) on interface configurations without. Low screen density and central placement of information were not found to be statistically significant predictors of prescribing accuracy. The presence of highlighting was the only factor that the majority of participants (80.3%) preferred, but no effect was found when comparing prescribing accuracy on preferred versus non-preferred interface configurations. Conclusions: The factorial design methodology developed is a novel approach for efficient and objective evaluation of multiple user interface design factors in one study. Evidence-based design and usability principles are needed to enhance the design and appropriate use of e-prescribing systems as usability problems continue to be one of the primary reasons for dissatisfaction and poor levels of adoption. / Thesis / Master of Science (MSc)

Background: People with intellectual disability are more likely than the general population to be prescribed psychotropic agents. The most common indications include treatment of a psychiatric disorder and management of behaviours that challenge. Aim: The study aimed to assess the prescribing patterns of psychotropic medication to outpatients with intellectual disability at a psychiatric hospital. Setting: Alexandra hospital outpatient clinic, Cape Town. Methods: This was a retrospective folder and prescription chart review. Folders of all new patients (103) seen between January 2018 and August 2019 were examined at two points, the initial appointment and again at six months. The information was examined against the World Psychiatric Association (WPA) and the National Institute for Health and Care Excellence (NICE) guidelines for prescribing in people with intellectual disability. Results: psychotropic medication was prescribed to 88% of patients. Antipsychotics accounted for more than 56% of the medication prescribed and was used mainly to manage behaviours that challenge. Clinicians at Alexandra hospital followed prescribing guidelines to some extent; however, more still needs to be done to ensure best practice and care. Conclusion: This review revealed a few shortcomings in meeting prescribing guidelines by clinicians at Alexandra hospital. Measures to address these shortcomings could be the inclusion of medication review schedules and standardised forms for clerking and monitoring of side effects in patient files, the use of behavioural strategies as the primary management of behaviours that challenge, and the performance of regular clinical practice audits.