Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 46
Filtrar
1.
J Eval Clin Pract ; 27(1): 143-150, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32307857

RESUMO

RATIONALE, AIMS, AND OBJECTIVES: Healthcare systems worldwide devote significant resources towards collecting data to support care quality assurance and improvement. In the United Kingdom, National Clinical Audits are intended to contribute to these objectives by providing public reports of data on healthcare treatment and outcomes, but their potential for quality improvement in particular is not realized fully among healthcare providers. Here, we aim to explore this outcome from the perspective of hospital boards and their quality committees: an under-studied area, given the emphasis in previous research on the audits' use by clinical teams. METHODS: We carried out semi-structured, qualitative interviews with 54 staff in different clinical and management settings in five English National Health Service hospitals about their use of NCA data, and the circumstances that supported or constrained such use. We used Framework Analysis to identify themes within their responses. RESULTS: We found that members and officers of hospitals' governing bodies perceived an imbalance between the benefits to their institutions from National Clinical Audits and the substantial resources consumed by participating in them. This led some to question the audits' legitimacy, which could limit scope for improvements based on audit data, proposed by clinical teams. CONCLUSIONS: Measures to enhance the audits' perceived legitimacy could help address these limitations. These include audit suppliers moving from an emphasis on cumulative, retrospective reports to real-time reporting, clearly presenting the "headline" outcomes important to institutional bodies and staff. Measures may also include further negotiation between hospitals, suppliers and their commissioners about the nature and volume of data the latter are expected to collect; wider use by hospitals of routine clinical data to populate audit data fields; and further development of interactive digital technologies to help staff explore and report audit data in meaningful ways.


Assuntos
Auditoria Clínica , Medicina Estatal , Pessoal de Saúde , Humanos , Estudos Retrospectivos , Reino Unido
2.
BMJ Open ; 10(10): e036608, 2020 10 10.
Artigo em Inglês | MEDLINE | ID: mdl-33039991

RESUMO

OBJECTIVE: Health services in many countries are investing in interorganisational networks, linking patients' records held in different organisations across a city or region. The aim of the systematic review was to establish how, why and in what circumstances these networks improve patient safety, fail to do so, or increase safety risks, for people living at home. DESIGN: Realist synthesis, drawing on both quantitative and qualitative evidence, and including consultation with stakeholders in nominal groups and semistructured interviews. ELIGIBILITY CRITERIA: The coordination of services for older people living at home, and medicine reconciliation for older patients returning home from hospital. INFORMATION SOURCES: 17 sources including Medline, Embase, CINAHL, Cochrane Library, Web of Science, ACM Digital Library, and Applied Social Sciences Index and Abstracts. OUTCOMES: Changes in patients' clinical risks. RESULTS: We did not find any detailed accounts of the sequences of events that policymakers and others believe will lead from the deployment of interoperable networks to improved patient safety. We were, though, able to identify a substantial number of theory fragments, and these were used to develop programme theories.There is good evidence that there are problems with the coordination of services in general, and the reconciliation of medication lists in particular, and it indicates that most problems are social and organisational in nature. There is also good evidence that doctors and other professionals find interoperable networks difficult to use. There was limited high-quality evidence about safety-related outcomes associated with the deployment of interoperable networks. CONCLUSIONS: Empirical evidence does not currently justify claims about the beneficial effects of interoperable networks on patient safety. There appears to be a mismatch between technology-driven assumptions about the effects of networks and the sociotechnical nature of coordination problems. PROSPERO REGISTRATION NUMBER: CRD42017073004.


Assuntos
Serviços de Informação , Tecnologia da Informação , Idoso , Idoso de 80 Anos ou mais , Humanos , Segurança do Paciente , Tecnologia
3.
BMJ Open ; 10(2): e033208, 2020 02 25.
Artigo em Inglês | MEDLINE | ID: mdl-32102812

RESUMO

INTRODUCTION: National audits are used to monitor care quality and safety and are anticipated to reduce unexplained variations in quality by stimulating quality improvement (QI). However, variation within and between providers in the extent of engagement with national audits means that the potential for national audit data to inform QI is not being realised. This study will undertake a feasibility evaluation of QualDash, a quality dashboard designed to support clinical teams and managers to explore data from two national audits, the Myocardial Ischaemia National Audit Project (MINAP) and the Paediatric Intensive Care Audit Network (PICANet). METHODS AND ANALYSIS: Realist evaluation, which involves building, testing and refining theories of how an intervention works, provides an overall framework for this feasibility study. Realist hypotheses that describe how, in what contexts, and why QualDash is expected to provide benefit will be tested across five hospitals. A controlled interrupted time series analysis, using key MINAP and PICANet measures, will provide preliminary evidence of the impact of QualDash, while ethnographic observations and interviews over 12 months will provide initial insight into contexts and mechanisms that lead to those impacts. Feasibility outcomes include the extent to which MINAP and PICANet data are used, data completeness in the audits, and the extent to which participants perceive QualDash to be useful and express the intention to continue using it after the study period. ETHICS AND DISSEMINATION: The study has been approved by the University of Leeds School of Healthcare Research Ethics Committee. Study results will provide an initial understanding of how, in what contexts, and why quality dashboards lead to improvements in care quality. These will be disseminated to academic audiences, study participants, hospital IT departments and national audits. If the results show a trial is feasible, we will disseminate the QualDash software through a stepped wedge cluster randomised trial.


Assuntos
Número de Leitos em Hospital/estatística & dados numéricos , Sistemas de Informação Hospitalar/organização & administração , Melhoria de Qualidade/organização & administração , Sistemas de Apoio a Decisões Clínicas/organização & administração , Estudos de Viabilidade , Humanos , Análise de Séries Temporais Interrompida , Sistemas Computadorizados de Registros Médicos/organização & administração
4.
Syst Rev ; 8(1): 307, 2019 12 05.
Artigo em Inglês | MEDLINE | ID: mdl-31806015

RESUMO

BACKGROUND: There is a widespread belief that information technologies will improve diagnosis, treatment and care. Evidence about their effectiveness in health care is, however, mixed. It is not clear why this is the case, given the remarkable advances in hardware and software over the last 20 years. This review focuses on interoperable information technologies, which governments are currently advocating and funding. These link organisations across a health economy, with a view to enabling health and care professionals to coordinate their work with one another and to access patient data wherever it is stored. Given the mixed evidence about information technologies in general, and current policies and funding, there is a need to establish the value of investments in this class of system. The aim of this review is to establish how, why and in what circumstances interoperable systems affect patient safety. METHODS: A realist synthesis will be undertaken, to understand how and why inter-organisational systems reduce patients' clinical risks, or fail to do so. The review will follow the steps in most published realist syntheses, including (1) clarifying the scope of the review and identifying candidate programme and mid-range theories to evaluate, (2) searching for evidence, (3) appraising primary studies in terms of their rigour and relevance and extracting evidence, (4) synthesising evidence, (5) identifying recommendations, based on assessment of the extent to which findings can be generalised to other settings. DISCUSSION: The findings of this realist synthesis will shed light on how and why an important class of systems, that span organisations in a health economy, will contribute to changes in patients' clinical risks. We anticipate that the findings will be generalizable, in two ways. First, a refined mid-range theory will contribute to our understanding of the underlying mechanisms that, for a range of information technologies, lead to changes in clinical practices and hence patients' risks (or not). Second, many governments are funding and implementing cross-organisational IT networks. The findings can inform policies on their design and implementation. SYSTEMATIC REVIEW REGISTRATION: PROSPERO CRD42017073004.


Assuntos
Tecnologia da Informação , Segurança do Paciente/normas , Projetos de Pesquisa , Literatura de Revisão como Assunto , Humanos , Serviços de Informação
5.
Stud Health Technol Inform ; 265: 63-68, 2019 Aug 09.
Artigo em Inglês | MEDLINE | ID: mdl-31431578

RESUMO

Policy makers and health system managers in many countries are advocating the deployment of inter-operable health information technology systems, spanning organisations in a health economy, believing that they will be clinically effective. The case for investments has not, however, been made to date. This paper presents early results from a systematic review of the effects of inter-operable systems on patient safety. The review uses the realist synthesis method, which focuses on evidence about the decisions and actions that link interventions and outcomes, as well as the evidence about those outcomes. The evidence base is sufficient to identify plausible arguments for investments in inter-operable systems. This said, there is limited empirical evidence about each of the steps in the sequences of events. We comment on implications for the design of sustainable socio-technical solutions. We suggest that current gaps in the evidence base are in areas where informatics field methods can make a valuable contribution to our understanding of the role of inter-operable systems in patient safety.


Assuntos
Informática Médica , Humanos , Segurança do Paciente
6.
Stud Health Technol Inform ; 264: 753-757, 2019 Aug 21.
Artigo em Inglês | MEDLINE | ID: mdl-31438025

RESUMO

Healthcare systems worldwide are investing in networked health IT systems that link healthcare providers across multiple organisations. Much of the policy arguments in favour of such investment rely on the assumption that networked health IT will lead to improved patient safety. As part of the first stage of a realist review to determine how and in what contexts networked, inter-organisational health IT does lead to improved patient safety, we elicited stakeholders' theories from the literature that reveal possible answers to this question. A key mechanism appears to be that the information provided supports improved decision making. Greatest benefits are likely to be found in relation to medication information, in scenarios where the patient is less able to provide accurate information about their medications themselves. However, access and use of this information depends on ease of access, clinicians' perception of the likelihood that the desired information will be available, and clinicians' trust in the information.


Assuntos
Tomada de Decisões , Segurança do Paciente , Atenção à Saúde , Pessoal de Saúde , Humanos , Tecnologia da Informação
7.
BMJ Open ; 8(11): e022921, 2018 11 25.
Artigo em Inglês | MEDLINE | ID: mdl-30478113

RESUMO

OBJECTIVE: To assess developments over time in the capture, curation and use of quality and safety information in managing hospital services. SETTING: Four acute National Health Service hospitals in England. PARTICIPANTS: 111.5 hours of observation of hospital board and directorate meetings, and 72 hours of ward observations. 86 interviews with board level and middle managers and with ward managers and staff. RESULTS: There were substantial improvements in the quantity and quality of data produced for boards and middle managers between 2013 and 2016, starting from a low base. All four hospitals deployed data warehouses, repositories where datasets from otherwise disparate departmental systems could be managed. Three of them deployed real-time ward management systems, which were used extensively by nurses and other staff. CONCLUSIONS: The findings, particularly relating to the deployment of real-time ward management systems, are a corrective to the many negative accounts of information technology implementations. The hospital information infrastructures were elements in a wider move, away from a reliance on individual professionals exercising judgements and towards team-based and data-driven approaches to the active management of risks. They were not, though, using their fine-grained data to develop ultrasafe working practices.


Assuntos
Administração Hospitalar , Gestão de Riscos/métodos , Governança Clínica/organização & administração , Inglaterra , Conselho Diretor/organização & administração , Administração Hospitalar/métodos , Sistemas de Informação Hospitalar/organização & administração , Humanos , Gestão de Riscos/organização & administração , Medicina Estatal/organização & administração
8.
AAPS PharmSciTech ; 19(5): 1998-2008, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29192405

RESUMO

The formulation factors relevant to developing immediate and controlled release dosage forms containing poorly soluble drugs dispersed in amorphous systems are poorly understood. While the utility of amorphous solid dispersions is becoming apparent in the pharmaceutical marketplace, literature reports tend to concentrate on the development of solid dispersion particulates, which then must be formulated into a tablet. Amorphous solid dispersions of itraconazole in high molecular weight hydroxypropyl methylcellulose were prepared by KinetiSol® Dispersing and tablets were formulated to immediately disintegrate or control the release of itraconazole. Formulated tablets were evaluated by two non-sink dissolution methodologies and the dosage form properties that controlled the gelling tendency of the dispersion carrier, hydroxypropyl methylcellulose, were investigated. Selected formulations were evaluated in an exploratory beagle dog pharmacokinetic study; the results of which indicate potential for a prolonged absorption phase relative to the commercially extruded control.


Assuntos
Antifúngicos/administração & dosagem , Antifúngicos/química , Itraconazol/administração & dosagem , Itraconazol/química , Animais , Antifúngicos/farmacocinética , Varredura Diferencial de Calorimetria , Química Farmacêutica/métodos , Cães , Composição de Medicamentos/métodos , Excipientes , Concentração de Íons de Hidrogênio , Derivados da Hipromelose , Mucosa Intestinal/metabolismo , Itraconazol/farmacocinética , Peso Molecular , Solubilidade , Comprimidos , Difração de Raios X
9.
J Adv Nurs ; 74(2): 407-424, 2018 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-28833356

RESUMO

AIM: To test the psychometric properties and clinical usability of a new Pressure Ulcer Risk Assessment Instrument including inter-rater and test-retest reliability, convergent validity and data completeness. BACKGROUND: Methodological and practical limitations associated with traditional Pressure Ulcer Risk Assessment Instruments, prompted a programme to work to develop a new instrument, as part of the National Institute for Health Research funded, Pressure UlceR Programme Of reSEarch (RP-PG-0407-10056). DESIGN: Observational field test. METHOD: For this clinical evaluation 230 patients were purposefully sampled across four broad levels of pressure ulcer risk with representation from four secondary care and four community NHS Trusts in England. Blinded and simultaneous paired (ward/community nurse and expert nurse) PURPOSE-T assessments were undertaken. Follow-up retest was undertaken by the expert nurse. Field notes of PURPOSE-T use were collected. Data were collected October 2012-January 2013. RESULTS: The clinical evaluation demonstrated "very good" (kappa) inter-rater and test-retest agreement for PURPOSE-T assessment decision overall. The percentage agreement for "problem/no problem" was over 75% for the main risk factors. Convergent validity demonstrated moderate to high associations with other measures of similar constructs. CONCLUSION: The PURPOSE-T evaluation facilitated the initial validation and clinical usability of the instrument and demonstrated that PURPOSE-T is suitable of use in clinical practice. Further study is needed to evaluate the impact of using the instrument on care processes and outcomes.


Assuntos
Úlcera por Pressão/diagnóstico , Psicometria , Medição de Risco/métodos , Adulto , Idoso , Inglaterra , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Reprodutibilidade dos Testes , Fatores de Risco
10.
Drug Dev Ind Pharm ; 43(5): 797-811, 2017 May.
Artigo em Inglês | MEDLINE | ID: mdl-27616147

RESUMO

The purpose of this study was to enhance the dissolution properties of albendazole (ABZ) by the use of amorphous solid dispersions. Phase diagrams of ABZ-polymer binary mixtures generated from Flory-Huggins theory were used to assess miscibility and processability. Forced degradation studies showed that ABZ degraded upon exposure to hydrogen peroxide and 1 N NaOH at 80 °C for 5 min, and the degradants were albendazole sulfoxide (ABZSX), and ABZ impurity A, respectively. ABZ was chemically stable following exposure to 1 N HCl at 80 °C for one hour. Thermal degradation profiles show that ABZ, with and without Kollidon® VA 64, degraded at 180 °C and 140 °C, respectively, which indicated that ABZ could likely be processed by thermal processing. Following hot melt extrusion, ABZ degraded up to 97.4%, while the amorphous ABZ solid dispersion was successfully prepared by spray drying. Spray-dried ABZ formulations using various types of acids (methanesulfonic acid, sulfuric acid and hydrochloric acid) and polymers (Kollidon® VA 64, Soluplus® and Eudragit® E PO) were studied. The spray-dried ABZ with methanesulfonic acid and Kollidon® VA 64 substantially improved non-sink dissolution in acidic media as compared to bulk ABZ (8-fold), physical mixture of ABZ:Kollidon® VA 64 (5.6-fold) and ABZ mesylate salt (1.6-fold). No degradation was observed in the spray-dried product for up to six months and less than 5% after one-year storage. In conclusion, amorphous ABZ solid dispersions in combination with an acid and polymer can be prepared by spray drying to enhance dissolution and shelf-stability, whereas those made by melt extrusion are degraded.


Assuntos
Albendazol/análogos & derivados , Composição de Medicamentos/métodos , Albendazol/química , Química Farmacêutica/métodos , Dessecação/métodos , Portadores de Fármacos/química , Estabilidade de Medicamentos , Congelamento , Temperatura Alta , Ácido Clorídrico/química , Mesilatos/química , Polietilenoglicóis/química , Polímeros/química , Ácidos Polimetacrílicos/química , Polivinil/química , Povidona/química , Solubilidade , Ácidos Sulfúricos/química
11.
Int J Pharm ; 515(1-2): 94-103, 2016 Dec 30.
Artigo em Inglês | MEDLINE | ID: mdl-27725271

RESUMO

Electrostatic powder deposition (ESPD) has been developed as a solvent-free method to prepare pharmaceutical films. The aim of this work was to investigate the influence of process parameters during (1) electrostatic powder deposition, (2) curing, and (3) removal of the film from the substrate on the properties of the film. Polyethylene oxide (PEO) was used as the model polymer and stainless steel 316 as the substrate. Deposition efficiency (i.e. deposited weight) was measured with varying charging voltage, gun tip to substrate distance, and environmental humidity. Scanning electron microscopy was utilized to assess film formation, and adhesive and mechanical strength of films were measured with varying cure temperature and time. Adhesive strength was measured for films prepared on substrates of varying surface roughness. When deposition was performed at low humidity conditions, 25%RH, process parameters did not significantly affect deposition behavior. At 40%RH, increasing deposition efficiency with decreasing gun tip to substrate distance and increasing voltage (up to 60kV) was observed. Complete film formation was seen by 30min at 80°C, compared to lower curing temperatures and times. All films were readily removed from the substrates. The results show the ESPD process can be modified to produce films with good mechanical properties (e.g. tensile strength>0.06MPa), suggesting it is a promising dry powder process for preparing pharmaceutical films.


Assuntos
Preparações Farmacêuticas/química , Pós/química , Adesivos/química , Umidade , Microscopia Eletrônica de Varredura/métodos , Polietilenoglicóis/química , Polímeros/química , Eletricidade Estática , Temperatura , Resistência à Tração
12.
Stud Health Technol Inform ; 228: 23-7, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27577334

RESUMO

Health systems around the world are investing increasing effort in monitoring care quality and safety. Dashboards can support this process, providing summary data on processes and outcomes of care, making use of data visualization techniques such as graphs. As part of a study exploring development and use of dashboards in English hospitals, we interviewed senior managers across 15 healthcare providers. Findings revealed substantial variation in sophistication of the dashboards in place, largely presenting retrospective data items determined by national bodies and dependent on manual collation from a number of systems. Where real time systems were in place, they supported staff in proactively managing quality and safety.


Assuntos
Eficiência Organizacional , Segurança do Paciente , Garantia da Qualidade dos Cuidados de Saúde/organização & administração , Indicadores de Qualidade em Assistência à Saúde , Inglaterra , Hospitais , Entrevistas como Assunto
13.
J Pharm Pharmacol ; 68(5): 678-91, 2016 May.
Artigo em Inglês | MEDLINE | ID: mdl-26454138

RESUMO

OBJECTIVES: To evaluate the effect of ritonavir (RTV) co-administration on the bioavailability of an amorphous dispersion of acetyl-11-keto-beta-boswellic acid (AKBA) and to develop a pharmaceutically acceptable AKBA-RTV combination tablet. METHODS: A pharmacokinetic (PK) study in rats was conducted to evaluate the influence of RTV co-administration on the oral bioavailability of an AKBA amorphous dispersion. KinetiSol was utilized to enable production of an improved RTV formulation that facilitated the development of an AKBA-RTV combination tablet. Following in-vitro characterization, the PK performance of the tablets was evaluated in male beagles. KEY FINDINGS: Co-administration of RTV increased oral absorption of AKBA by about fourfold over the AKBA dispersion alone and approximately 24-fold over the pure compound. The improved RTV amorphous dispersion exhibited similar purity and neutral-phase dissolution to Norvir. The AKBA-RTV combination tablets yielded a substantial increase in AKBA's bioavailability in dogs. CONCLUSIONS: Oral absorption of AKBA is substantially limited by intestinal CYP3A activity and poor aqueous solubility. Consequently, AKBA's oral bioavailability is maximized by administration from a supersaturating formulation in conjunction with a CYP3A inhibitor. The AKBA-RTV combination tablet presented herein represents a breakthrough in the oral delivery of the compound facilitating future use as a drug therapy for broad spectrum cancer treatment.


Assuntos
Antineoplásicos Fitogênicos/farmacocinética , Inibidores do Citocromo P-450 CYP3A/farmacocinética , Citocromo P-450 CYP3A/metabolismo , Intestinos/efeitos dos fármacos , Ritonavir/farmacocinética , Triterpenos/farmacocinética , Administração Oral , Animais , Antineoplásicos Fitogênicos/administração & dosagem , Antineoplásicos Fitogênicos/química , Disponibilidade Biológica , Biotransformação , Inibidores do Citocromo P-450 CYP3A/administração & dosagem , Inibidores do Citocromo P-450 CYP3A/química , Cães , Combinação de Medicamentos , Composição de Medicamentos , Intestinos/enzimologia , Masculino , Ritonavir/administração & dosagem , Ritonavir/química , Comprimidos , Tecnologia Farmacêutica/métodos , Triterpenos/administração & dosagem , Triterpenos/química
14.
AAPS PharmSciTech ; 17(1): 106-19, 2016 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-26335416

RESUMO

Hypromellose is a hydrophilic polymer widely used in immediate- and modified-release oral pharmaceutical dosage forms. However, currently available grades of hypromellose are difficult, if not impossible, to process by hot melt extrusion (HME) because of their high glass transition temperature, high melt viscosity, and low degradation temperature. To overcome these challenges, a modified grade of hypromellose, AFFINISOL™ HPMC HME, was recently introduced. It has a significantly lower glass transition temperature and melt viscosity as compared to other available grades of hypromellose. The objective of this paper is to assess the extrudability and performance of AFFINISOL™ HPMC HME (100LV and 4M) as compared to other widely used polymers in HME, including HPMC 2910 100cP (the currently available hypromellose), Soluplus®, Kollidon® VA 64, and EUDRAGIT® E PO. Formulations containing polymer and carbamazepine (CBZ) were extruded on a co-rotating 16-mm twin-screw extruder, and the effect of temperature, screw speed, and feed rate was investigated. The performance of the solid dispersions was evaluated based on Flory-Huggins modeling and characterized by differential scanning calorimetry (DSC), X-ray powder diffraction (XRD), Raman spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, and dissolution. All formulations extruded well except for HPMC 2910 100cP, which resulted in over-torqueing the extruder (machine overloading because the motor cannot provide efficient energy to rotate the shaft). Among the HME extrudates, only the EUDRAGIT® E PO formulation was crystalline as confirmed by DSC, XRD, and Raman, which agreed with predictions from Flory-Huggins modeling. Dissolution testing was conducted under both sink and non-sink conditions. Sink dissolution testing in neutral media revealed that amorphous CBZ in the HME extrudates completely dissolved within 15 min, which was much more rapid than the time for complete dissolution of bulk CBZ (60 min) and EUDRAGIT® E PO solid dispersion (more than 6 h). Non-sink dissolution in acidic media testing revealed that only CBZ contained in the AFFINISOL™ HPMC HME, and EUDRAGIT® E PO solid dispersions rapidly supersaturated after 15 min, reaching a twofold drug concentration compared to the CBZ equilibrium solubility. In summary, AFFINISOL™ HPMC HME 100LV and AFFINISOL™ HPMC HME 4M are useful in the pharmaceutical HME process to increase wetting and dissolution properties of poorly water-soluble drugs like CBZ.


Assuntos
Química Farmacêutica/métodos , Derivados da Hipromelose/química , Polímeros/química , Varredura Diferencial de Calorimetria/métodos , Carbamazepina/química , Composição de Medicamentos/métodos , Temperatura Alta , Polietilenoglicóis/química , Ácidos Polimetacrílicos/química , Polivinil/química , Povidona/química , Pós/química , Solubilidade , Espectroscopia de Infravermelho com Transformada de Fourier/métodos , Viscosidade , Água/química , Difração de Raios X/métodos
15.
AAPS PharmSciTech ; 17(1): 167-79, 2016 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-26637232

RESUMO

Polyvinyl alcohol (PVAL) has not been investigated in a binary formulation as a concentration-enhancing polymer owing to its high melting point/high viscosity and poor organic solubility. Due to the unique attributes of the KinetiSol® dispersing (KSD) technology, PVAL has been enabled for this application and it is the aim of this paper to investigate various grades for improvement of the solubility and bioavailability of poorly water soluble active pharmaceutical ingredients. Solid amorphous dispersions were created with the model drug, itraconazole (ITZ), at a selected drug loading of 20%. Polymer grades were chosen with variation in molecular weight and degree of hydroxylation to determine the effects on performance. Differential scanning calorimetry, powder X-ray diffraction, polarized light microscopy, size exclusion chromatography, and dissolution testing were used to characterize the amorphous dispersions. An in vivo pharmacokinetic study in rats was also conducted to compare the selected formulation to current market formulations of ITZ. The 4-88 grade of PVAL was determined to be effective at enhancing solubility and bioavailability of itraconazole.


Assuntos
Itraconazol/química , Polímeros/química , Álcool de Polivinil/química , Solubilidade , Água/química , Animais , Disponibilidade Biológica , Varredura Diferencial de Calorimetria/métodos , Química Farmacêutica/métodos , Composição de Medicamentos/métodos , Sistemas de Liberação de Medicamentos/métodos , Excipientes/química , Itraconazol/farmacocinética , Masculino , Pós/química , Ratos , Ratos Sprague-Dawley , Difração de Raios X/métodos
16.
Soc Sci Med ; 145: 107-14, 2015 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-26460510

RESUMO

This article investigates network governance in the context of health and wellbeing services in England, focussing on relationships between managers in a range of services. There are three aims, namely to investigate, (i) the configurations of networks, (ii) the stability of network relationships over time and, (iii) the balance between formal and informal ties that underpin inter-agency relationships. Latent position cluster network models were used to characterise relationships. Managers were asked two questions, both designed to characterise informal relationships. The resulting networks differed substantially from one another in membership. Managers described networks of relationships that spanned organisational boundaries, and that changed substantially over time. The findings suggest that inter-agency co-ordination depends more on informal than on formal relationships.


Assuntos
Redes Comunitárias , Relações Interprofissionais , Saúde Pública , Apoio Social , Atenção à Saúde/organização & administração , Inglaterra , Humanos
17.
Int J Pharm ; 487(1-2): 72-80, 2015 Jun 20.
Artigo em Inglês | MEDLINE | ID: mdl-25839417

RESUMO

Interest in granulation processes using twin screw extrusion machines is rapidly growing. The primary objectives of this study were to develop a continuous granulation process for direct production of granules using this technique with glyceryl behenate as a binder, evaluate the properties of the resulting granules and develop controlled release tablets containing tramadol HCl. In addition, the granulation mechanism was probed and the polymorphic form of the lipid and drug release rate were evaluated on stability. Granules were prepared using a Leistritz NANO16 twin screw extruder operated without a constricting die. The solid state of the granules were characterized by differential scanning calorimetry and X-ray diffraction. Formulated tablets were studied in 0.1N HCl containing 0-40% ethanol to investigate propensity for alcohol induced dose dumping. The extrusion barrel temperature profile and feed rate were determined to be the primary factors influencing the particle size distribution. Granules were formed by a combination immersion/distribution mechanism, did not require subsequent milling, and were observed to contain desirable polymorphic forms of glyceryl behenate. Drug release from tablets was complete and controlled over 16 h and the tablets were determined to be resistant to alcohol induced dose dumping. The drug release rate from the tablets was found to be stable at 40°C and 75% relative humidity for the duration of a 3 month study.


Assuntos
Analgésicos Opioides/administração & dosagem , Ácidos Graxos/química , Tramadol/administração & dosagem , Analgésicos Opioides/efeitos adversos , Analgésicos Opioides/farmacocinética , Preparações de Ação Retardada , Composição de Medicamentos , Estabilidade de Medicamentos , Excipientes , Ácidos Graxos/administração & dosagem , Tamanho da Partícula , Pós , Solubilidade , Comprimidos , Tramadol/efeitos adversos , Tramadol/farmacocinética
18.
J Pharm Pharmacol ; 67(7): 918-38, 2015 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-25645386

RESUMO

OBJECTIVES: This study focuses on the application of hot melt extrusion (HME) to produce solid dispersions containing griseofulvin (GF) and investigates the in-vitro dissolution performance of HME powders and resulting tablet compositions containing HME-processed dispersions. METHODS: Binary, ternary and quaternary dispersions containing GF, enteric polymer (Eudragit L100-55 or AQOAT-LF) and/or vinyl pyrrolidone-based polymer (Plasdone K-12 povidone or S-630 copovidone) were processed by HME. Two plasticizers, triethyl citrate (TEC) and acetyl tributyl citrate (ATBC), were incorporated to aid in melt processing and to modify release of GF in neutral media following a pH-change in dissolution. Products were characterized for GF recovery, degrees of compositional amorphous character, intermolecular interactions and non-sink dissolution performance. KEY FINDINGS: Binary dispersions exhibited lower maximum observed concentration values and magnitudes of supersaturated GF in neutral media dissolution in comparison with the ternary dispersions. The quaternary HME products, 1 : 2 : 1 : 0.6 GF : L100-55 : S-630 : ATBC and GF : AQOAT-LF : K-12 : ATBC, were determined as the most optimal concentration-enhancing compositions due to increased hydrogen bonding of enteric functional groups with carbonyl/acetate groups of vinyl pyrrolidone-based polymers, reduced compositional crystallinity and presence of incorporated hydrophobic plasticizer. CONCLUSIONS: HME products containing combinations of concentration-enhancing polymers can supersaturate and sustain GF dissolution to greater magnitudes in neutral media following the pH-transition and be compressed into immediate-release tablets exhibiting similar dissolution profiles.


Assuntos
Griseofulvina/química , Polímeros/química , Resinas Acrílicas/química , Citratos/química , Portadores de Fármacos/química , Composição de Medicamentos/métodos , Temperatura Alta , Concentração de Íons de Hidrogênio , Interações Hidrofóbicas e Hidrofílicas , Plastificantes/química , Povidona/química , Pós/química , Solubilidade , Comprimidos/química
19.
Mol Pharm ; 12(1): 120-6, 2015 Jan 05.
Artigo em Inglês | MEDLINE | ID: mdl-25347621

RESUMO

The objective of this study was to evaluate the use of glyceryl behenate as a plasticizer and release modifier in solid dispersion systems containing itraconazole and carbamazepine. Amorphous solid dispersions of high molecular weight polyvinylpyrrolidone were prepared by hot-melt extrusion, the processing of which was improved by the inclusion of glyceryl behenate. Dispersions were milled and subsequently compressed into tablets. Solid dispersions were also prepared by KinetiSol Dispersing, which allowed for the manufacture of monolithic tablets of the same composition and shape as compressed tablets. Tablets without glyceryl behenate and all compressed tablets were observed to have an incomplete release profile likely due to drug crystallization within the tablet as this occurred at conditions in which dissolution concentrations were below saturation. Monolithic tablets formulated to be more hydrophobic, by including glyceryl behenate, allowed for sustained release below and above saturation conditions.


Assuntos
Carbamazepina/química , Ácidos Graxos/química , Comprimidos/química , Cromatografia Líquida de Alta Pressão , Preparações de Ação Retardada , Sistemas de Liberação de Medicamentos , Temperatura Alta , Itraconazol/química , Cinética , Lipídeos/química , Peso Molecular , Plastificantes , Povidona/química , Pós , Difração de Raios X
20.
Drug Dev Ind Pharm ; 41(8): 1294-301, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25133663

RESUMO

While the use of amorphous solid dispersions to improve aqueous solubility is well documented, little consideration has traditionally been given to the finished dosage form. The objective of this study was to evaluate the dissolution performance of amorphous solid dispersions containing a dispersed superdisintegrant with binding properties. KinetiSol® dispersing was used to thermally process hypromellose acetate succinate-based compositions containing the drug substance nifedipine (NIF) and a highly compressible grade of low-substituted hydroxypropyl cellulose (New Binder Disintegrants; NBD-grade). Solid-state analysis demonstrated that compositions were rendered amorphous during processing. Tablets containing intra-dispersion NBD were found to exhibit non-sink dissolution performance similar to milled intermediate, demonstrating excellent disintegration characteristics. Conversely, tablets without intra-dispersion NBD were found to release significantly less NIF during dissolution analysis due to particle agglomeration. It was determined that compressibility and particle wetting increased as the level of intra-dispersion NBD increased.


Assuntos
Celulose/análogos & derivados , Química Farmacêutica/métodos , Portadores de Fármacos/química , Celulose/química , Celulose/farmacocinética , Portadores de Fármacos/farmacocinética , Comprimidos
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA