Liset van Dijk

Definitions, variants, and causes of nonadherence with medication: a challenge for tailored interventions

Background Nonadherence with medication is a complex and multidimensional health care problem. The causes may be related to the patient, treatment, and/or health care provider. As a consequence, substantial numbers of patients do not benefit optimally from pharmacotherapy, resulting in increased morbidity and mortality as well as increased societal costs. Several interventions may contribute to improved adherence. However, most interventions have only a modest effect. Thus, despite the many efforts made, there has been little progress made as yet in tackling the problem of nonadherence. Methods This paper summarizes the definitions and taxonomy of adherence with medication, as well as types and causes of nonadherence. In addition, interventions aimed at improvement of adherence are discussed. Conclusion There is not just one solution for the nonadherence problem that fits all patients. Most interventions to improve adherence are aimed at all patients regardless of whether they are adherent or not. Recently, a number of tailored interventions have been described in the literature. Modern techniques are useful. Electronic pill boxes combined with Short Message Service reminders are specifically designed to improve unintentional adherence and have resulted in an increase in refill adherence in diabetic patients with suboptimal adherence. Tailored Internet interventions are a possibility for influencing patient drug-taking behavior and show promising results. Tailored counseling interventions targeted at the underlying causes of nonadherence seem an attractive method for supporting patients with their use of drugs. However, despite the plausible theoretical framework, data on long-term health effects of the various interventions are not available. To improve adherence effectively, there is a need for a tailored approach based on the type and cause of nonadherence and the specific needs of the patient.

Nurse prescribing of medicines in Western European and Anglo-Saxon countries: a systematic review of the literature

BackgroundA growing number of countries are introducing some form of nurse prescribing. However, international reviews concerning nurse prescribing are scarce and lack a systematic and theoretical approach. The aim of this review was twofold: firstly, to gain insight into the scientific and professional literature describing the extent to and the ways in which nurse prescribing has been realised or is being introduced in Western European and Anglo-Saxon countries; secondly, to identify possible mechanisms underlying the introduction and organisation of nurse prescribing on the basis of Abbotts theory on the division of professional labor.MethodsA comprehensive search of six literature databases and seven websites was performed without any limitation as to date of publication, language or country. Additionally, experts in the field of nurse prescribing were consulted. A three stage inclusion process, consisting of initial sifting, more detailed selection and checking full-text publications, was performed independently by pairs of reviewers. Data were synthesized using narrative and tabular methods.ResultsOne hundred and twenty-four publications met the inclusion criteria. So far, seven Western European and Anglo-Saxon countries have implemented nurse prescribing of medicines, viz., Australia, Canada, Ireland, New Zealand, Sweden, the UK and the USA. The Netherlands and Spain are in the process of introducing nurse prescribing. A diversity of external and internal forces has led to the introduction of nurse prescribing internationally. The legal, educational and organizational conditions under which nurses prescribe medicines vary considerably between countries; from situations where nurses prescribe independently to situations in which prescribing by nurses is only allowed under strict conditions and supervision of physicians.ConclusionsDifferences between countries are reflected in the jurisdictional settlements between the nursing and medical professions concerning prescribing. In some countries, nurses share (full) jurisdiction with the medical profession, whereas in other countries nurses prescribe in a subordinate position. In most countries the jurisdiction over prescribing remains predominantly with the medical profession. There seems to be a mechanism linking the jurisdictional settlements between professions with the forces that led to the introduction of nurse prescribing. Forces focussing on efficiency appear to lead to more extensive prescribing rights.

Initiation of antidepressant therapy: do patients follow the GP's prescription?

BACKGROUND The question whether patients actually start drug taking after having received a first antidepressant prescription is often overlooked. AIM To determine the incidence of patients who do not fill or fill only a single antidepressant prescription at the pharmacy, and to identify associated patient characteristics. DESIGN OF STUDY Retrospective study linking a general practice to a pharmacy dispensing database. SETTING General practice in the Netherlands. METHOD STUDY POPULATION patients who received a first-time antidepressant prescription from a GP. Three patient groups were identified: patients who did not fill the prescription (non-fillers); patients who filled only a single prescription (single Rx-fillers); and patients who filled at least two consecutive prescriptions. Non-fillers and single Rx-fillers were combined into a group of decliners. RESULTS Of all 965 patients, 41 (4.2%) did not fill the prescription, and 229 (23.7%) filled only a single prescription. Patients who consulted their GP for a non-specific indication, rather than for depression, anxiety, panic, or obsessive-compulsive disorder, were almost three times more likely (odds ratio [OR] = 2.7, 95% confidence interval [CI] = 1.8 to 3.9) to decline treatment. Further, the risk of declining was almost fivefold higher (OR = 4.8, 95% CI = 2.1 to 11.3) in non-Western immigrants, and almost twofold higher (OR = 1.8, 95% CI = 1.2 to 2.8) in patients >60 years of age. CONCLUSION Over one in four patients who receive a first-time antidepressant prescription decline treatment; they either do not initiate drug taking or do not persist with antidepressant use for longer than 2 weeks.

Pediatric Drug Formulations: A Review of Challenges and Progress

Children differ from adults in many aspects of pharmacotherapy, including capabilities for drug administration, medicine-related toxicity, and taste preferences. It is essential that pediatric medicines are formulated to best suit a child’s age, size, physiologic condition, and treatment requirements. To ensure adequate treatment of all children, different routes of administration, dosage forms, and strengths may be required. Many existing formulations are not suitable for children, which often leads to off-label and unlicensed use of adult medicines. New regulations, additional funding opportunities, and innovative collaborative research initiatives have resulted in some recent progress in the development of pediatric formulations. These advances include a paradigm shift toward oral solid formulations and a focus on novel preparations, including flexible, dispersible, and multiparticulate oral solid dosage forms. Such developments have enabled greater dose flexibility, easier administration, and better acceptance of drug formulations in children. However, new pediatric formulations address only a small part of all therapeutic needs in children; moreover, they are not always available. Five key issues need to be addressed to stimulate the further development of better medicines for children: (1) the continued prioritization of unmet formulation needs, particularly drug delivery in neonates and treatment gaps in pediatric cancers and childhood diseases in developing countries; (2) a better use of existing data to facilitate pediatric formulation development; (3) innovative technologies in adults that can be used to develop new pediatric formulations; (4) clinical feedback and practice-based evidence on the impact of novel formulations; and (5) improved access to new pediatric formulations.

Prescription of respiratory medication without an asthma diagnosis in children: a population based study

BackgroundIn pre-school children a diagnosis of asthma is not easily made and only a minority of wheezing children will develop persistent atopic asthma. According to the general consensus a diagnosis of asthma becomes more certain with increasing age. Therefore the congruence between asthma medication use and doctor-diagnosed asthma is expected to increase with age. The aim of this study is to evaluate the relationship between prescribing of asthma medication and doctor-diagnosed asthma in children age 0–17.MethodsWe studied all 74,580 children below 18 years of age, belonging to 95 GP practices within the second Dutch national survey of general practice (DNSGP-2), in which GPs registered all physician-patient contacts during the year 2001. Status on prescribing of asthma medication (at least one prescription for beta2-agonists, inhaled corticosteroids, cromones or montelukast) and doctor-diagnosed asthma (coded according to the International Classification of Primary Care) was determined.ResultsIn total 7.5% of children received asthma medication and 4.1% had a diagnosis of asthma. Only 49% of all children receiving asthma medication was diagnosed as an asthmatic. Subgroup analyses on age, gender and therapy groups showed that the Positive Predictive Value (PPV) differs significantly between therapy groups only. The likelihood of having doctor-diagnosed asthma increased when a child received combination therapy of short acting beta2-agonists and inhaled corticosteroids (PPV = 0.64) and with the number of prescriptions (3 prescriptions or more, PPV = 0.66). Both prescribing of asthma medication and doctor-diagnosed asthma declined with age but the congruence between the two measures did not increase with age.ConclusionIn this study, less than half of all children receiving asthma medication had a registered diagnosis of asthma. Detailed subgroup analyses show that a diagnosis of asthma was present in at most 66%, even in groups of children treated intensively with asthma medication. Although age strongly influences the chance of being treated, remarkably, the congruence between prescribing of asthma medication and doctor-diagnosed asthma does not increase with age.

Tailored information for cancer patients on the Internet: effects of visual cues and language complexity on information recall and satisfaction

OBJECTIVE This study was designed to investigate the effects of visual cues and language complexity on satisfaction and information recall using a personalised website for lung cancer patients. In addition, age effects were investigated. METHODS An experiment using a 2 (complex vs. non-complex language)×3 (text only vs. photograph vs. drawing) factorial design was conducted. In total, 200 respondents without cancer were exposed to one of the six conditions. RESULTS Respondents were more satisfied with the comprehensibility of both websites when they were presented with a visual cue. A significant interaction effect was found between language complexity and photograph use such that satisfaction with comprehensibility improved when a photograph was added to the complex language condition. Next, an interaction effect was found between age and satisfaction, which indicates that adding a visual cue is more important for older adults than younger adults. Finally, respondents who were exposed to a website with less complex language showed higher recall scores. CONCLUSION The use of visual cues enhances satisfaction with the information presented on the website, and the use of non-complex language improves recall. PRACTICE IMPLICATIONS The results of the current study can be used to improve computer-based information systems for patients.

Bridging Differences in Outcomes of Pharmacoepidemiological Studies: Design and First Results of the PROTECT Project

Background: Observational pharmacoepidemiological (PE) studies on drug safety have produced discrepant results that may be due to differences in design, conduct and analysis. Purpose: The pharmacoepidemiology work-package (WP2) of the Pharmacoepidemiological Research on Outcomes of Therapeutics by a European ConsorTium (PROTECT) project aims at developing, testing and disseminating methodological standards for design, conduct and analysis of pharmacoepidemiological studies applicable to different safety issues using different databases across European countries. This article describes the selection of the safety issues and the description of the databases to be systematically studied. Methods: Based on two consensus meetings and a literature search, we selected five drug-adverse event (AE) pairs to be evaluated in different databases. This selection was done according to pre-defined criteria such as regulatory and public health impact, and the potential to investigate a broad range of methodological issues. Results: The selected drug-AE pairs are: 1) inhaled long-acting beta-2 agonists and acute myocardial infarction; 2) antimicrobials and acute liver injury; 3) antidepressants and/or benzodiazepines and hip fracture; 4) anticonvulsants and suicide/suicide attempts; and 5) calcium channel blockers and malignancies. Six European databases, that will be used to evaluate the drug-AE pairs retrospectively, are also described. Conclusion: The selected drug-AE pairs will be evaluated in PE studies using common protocols. Based on consistencies and discrepancies of these studies, a framework for guiding methodological choices will be developed. This will increase the usefulness and reliability of PE studies for benefit-risk assessment and decision-making.

Antibiotics for respiratory, ear and urinary tract disorders and consistency among GPs

OBJECTIVES To describe specific diagnoses for which systemic antibiotics are prescribed, to assess adherence of antibiotic choice to national guidelines and to assess consistency among general practitioners (GPs) in prescribed volumes of antibiotics for respiratory, ear and urinary tract disorders. METHODS The cross-sectional study included 174 GPs from 89 general practices. Data were derived from the Second Dutch National Survey of General Practice (DNSGP-2) in 2001. Outcome measures were the antibiotic prescriptions for respiratory, ear and urinary tract disorders defined according to the International Classification of Primary Care codes, the percentage of first-choice antibiotics complying with national guidelines and the number of antibiotic prescriptions per 1000 patients per GP per year. RESULTS The most antibiotics for respiratory tract infection (RTI) were prescribed for acute bronchitis (25%), sinusitis (22%) and acute upper RTI (14%). The most antibiotics were prescribed for acute otitis media (77% of ear disorders) and cystitis (95% of urinary tract disorders). First-choice antibiotics were prescribed in approximately 75% of the cases, whereas macrolides and amoxicillin/clavulanate (second-choice antibiotics) were prescribed in approximately 25%, especially in lower RTIs. The correlations (Spearman rho) between prescribed volumes for the three main groups of disorders varied from 0.39 to 0.67. CONCLUSIONS GPs were consistent in prescribing antibiotics for the three groups of diseases. Improvement strategies should focus on the management of acute upper RTIs and acute bronchitis and also on the use of amoxicillin/clavulanate and macrolides, these being mostly second-choice antibiotics in national guidelines.

“I just forget to take it”: asthma self-management needs and preferences in adolescents

Abstract Background: Medication adherence rates often decline as children become teenagers. Effective adherence-enhancing interventions for adolescents are lacking. The objective of this study was to assess adolescent asthmatics needs and preferences regarding medication counseling and support, with focus on new media. Methods: Three focus groups including 21 asthmatic adolescents recruited from both primary and secondary care were held to explore needs and preferences regarding asthma-self management. Questions concerned adherence behavior and needs and preferences in adherence support with focus on new media (mobile technology, social media, health games). Results: Forgetting was mentioned as major reason for not using medication as prescribed. Adolescents also mentioned lack of perceived need or beneficial effects. Parents mainly play a role in reminding to take medication and collecting refills. The suggested strategies to support self-management included smartphone applications with a reminder function and easy access to online information. Participants were positive about sharing of experiences with other teenagers. Conclusion: Forgetfulness is a major reason for non-adherence in adolescents. Furthermore, our results suggest use of peer support may be helpful in promoting good medication use. Future interventions should be aimed at providing practical reminders and should be modifiable to individual preferences.

Words that make pills easier to swallow: a communication typology to address practical and perceptual barriers to medication intake behavior

Purpose The barriers to patients’ successful medication intake behavior could be reduced through tailored communication about these barriers. The aim of this study is therefore (1) to develop a new communication typology to address these barriers to successful medication intake behavior, and (2) to examine the relationship between the use of the typology and the reduction of the barriers to successful medication intake behavior. Patients and methods Based on a literature review, the practical and perceptual barriers to successful medication intake behavior typology (PPB-typology) was developed. The PPB-typology addresses four potential types of barriers that can be either practical (memory and daily routine barriers) or perceptual (concern and necessity barriers). The typology describes tailored communication strategies that are organized according to barriers and communication strategies that are organized according to provider and patient roles. Eighty consultations concerning first-time medication use between nurses and inflammatory bowel disease patients were videotaped. The verbal content of the consultations was analyzed using a coding system based on the PPB-typology. The Medication Understanding and Use Self-efficacy Scale and the Beliefs about Medicine Questionnaire Scale were used as indicators of patients’ barriers and correlated with PPB-related scores. Results The results showed that nurses generally did not communicate with patients according to the typology. However, when they did, fewer barriers to successful medication intake behavior were identified. A significant association was found between nurses who encouraged question-asking behavior and memory barriers (r = −0.228, P = 0.042) and between nurses who summarized information (r = −0.254, P = 0.023) or used cartoons or pictures (r = −0.249, P = 0.026) and concern barriers. Moreover, a significant relationship between patients’ emotional cues about side effects and perceived concern barriers (r = 0.244, P = 0.029) was found as well. Conclusion The PPB-typology provides communication recommendations that are designed to meet patients’ needs and assist providers in the promotion of successful medication intake behavior, and it can be a useful tool for developing effective communication skills training programs.