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1.
Eur J Gen Pract ; 30(1): 2328716, 2024 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-38511848

RESUMO

BACKGROUND: The COVID-19 pandemic has accentuated the indispensable role of primary care. Objectives: Recognising this, the PRICOV-19 study investigated how 5,489 GP practices across 38 countries (Austria, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Israel, Italy, Kosovo*, Latvia, Lithuania, Luxembourg, Malta, Republic of Moldova, Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, Serbia, Slovenia, Spain, Sweden, Switzerland, Turkey, Ukraine, and United Kingdom) adapted their care delivery during the pandemic. METHODS: Based on a series of discussions on the results of the PRICOV-19 study group, eight recommendations to enhance primary care's preparedness for future crises were formulated and endorsed by EQuiP and WONCA Europe. RESULTS: The recommendations underscore the importance of recognising and sustaining the substantial strides made in patient safety within GP practices during the pandemic in current daily practices; acknowledging and supporting the pivotal role of GP practices in addressing health inequalities during crises; adopting interprofessional care models to enhance practices' resilience and adaptability to change; supporting training practices; creating healthy working environments; investing in infrastructure that supports adequate and safe care; and increasing funding for research on patient safety and primary care quality to inform evidence-based health policies and fostering international knowledge exchange among healthcare professionals and policymakers. CONCLUSION: Policymakers, primary care associations, and the broader healthcare system are urged to collaboratively take responsibility and increase support for GP practices to enhance their resilience, adaptability, and capacity to deliver safe and equitable healthcare during future crises.


Governments should recognise the critical role of family medicine in addressing inequity and prioritise carers' wellbeing to maintain quality care during crises.Associations for practitioners should lead in crisis management developments and advocate for primary care.PC facilities should participate in health system design to answer challenges posed by crises.


Assuntos
COVID-19 , Pandemias , Humanos , Europa (Continente) , Polônia , Atenção Primária à Saúde , Sérvia
2.
Healthcare (Basel) ; 11(23)2023 Nov 21.
Artigo em Inglês | MEDLINE | ID: mdl-38063577

RESUMO

Addressing equity in healthcare is fundamental for delivering safe care to vulnerable patients, especially during COVID-19. This paper aims to identify barriers and enabling factors for general practitioners (GPs) in delivering safe and equitable care during the COVID-19 pandemic. Semi-structured interviews took place during May-July 2020 among 18 Flemish and 16 Dutch GPs. Thematic analysis of the interviews demonstrated that while GPs acknowledged a smooth information flow by governments and professional organizations on care guidelines, the fast-changing information challenged them to stay up to date. Media communication facilitated information dissemination but also fueled misinformation and miscommunication, creating unrealistic patient expectations. Certain guidelines and patient reluctance delayed necessary care. A shortage of personal protective equipment made GPs concerned about patient safety during face-to-face contacts. Teleconsultations became a popular alternative, but posed increased patient safety risks. GPs struggled to identify and reach vulnerable patients. Equitable care was hindered by time constraints; thus, having the appropriate materials facilitated such care. An interprofessional collaboration involving paramedical, social, and city services benefited patient safety and equity in healthcare. However, limitations in this collaboration pressured GPs. The unprecedented and resource-constrained environment challenged GPs' capacity to provide the healthcare quality they aspired to deliver. A well-structured collaborative network involving all stakeholders could benefit safe and equitable care in future pandemics.

3.
BMJ Open ; 13(3): e069180, 2023 03 15.
Artigo em Inglês | MEDLINE | ID: mdl-36921939

RESUMO

BACKGROUND: Complexity theory has been chosen by many authors as a suitable lens through which to examine health and social care. Despite its potential value, many empirical investigations apply the theory in a tokenistic manner without engaging with its underlying concepts and underpinnings. OBJECTIVES: The aim of this scoping review is to synthesise the literature on empirical studies that have centred on the application of complexity theory to understand health and social care provision. METHODS: This scoping review considered primary research using complexity theory-informed approaches, published in English between 2012 and 2021. Cochrane Database of Systematic Reviews, MEDLINE, CINAHL, EMBASE, Web of Science, PSYCHINFO, the NHS Economic Evaluation Database, and the Health Economic Evaluations Database were searched. In addition, a manual search of the reference lists of relevant articles was conducted. Data extraction was conducted using Covidence software and a data extraction form was created to produce a descriptive summary of the results, addressing the objectives and research question. The review used the revised Arksey and O'Malley framework and adhered to the Preferred Reporting Items for Systematic Reviews and Meta-analysis Extension for Scoping Reviews (PRISMA-ScR). RESULTS: 2021 studies were initially identified with a total of 61 articles included for extraction. Complexity theory in health and social care research is poorly defined and described and was most commonly applied as a theoretical and analytical framework. The full breadth of the health and social care continuum was not represented in the identified articles, with the majority being healthcare focused. DISCUSSION: Complexity theory is being increasingly embraced in health and care research. The heterogeneity of the literature regarding the application of complexity theory made synthesis challenging. However, this scoping review has synthesised the most recent evidence and contributes to translational systems research by providing guidance for future studies. CONCLUSION: The study of complex health and care systems necessitates methods of interpreting dynamic prcesses which requires qualitative and longitudinal studies with abductive reasoning. The authors provide guidance on conducting complexity-informed primary research that seeks to promote rigor and transparency in the area. REGISTRATION: The scoping review protocol was registered at Open Science Framework, and the review protocol was published at BMJ Open (https://bit.ly/3Ex1Inu).


Assuntos
Atenção à Saúde , Apoio Social , Humanos , Projetos de Pesquisa
4.
Rural Remote Health ; 23(1): 7905, 2023 01.
Artigo em Inglês | MEDLINE | ID: mdl-36631080

RESUMO

The 19th World Rural Health Conference, hosted in rural Ireland and the University of Limerick, with over 650 participants coming from 40 countries and an additional 1600 engaging online, has carefully considered how best rural communities can be empowered to improve their own health and the health of those around them. The conference also considered the role of national health systems and all stakeholders, in keeping with the commitments made through the Sustainable Development Goals and the enjoyment of the highest attainable standard of health as one of the fundamental rights of every human being. This conference declaration, the Limerick Declaration on Rural Healthcare, is designed to inform rural communities, academics and policymakers about how to achieve the goal of delivering high quality health care in rural and remote areas most effectively, with a particular focus on the Irish healthcare system. Congruent with current evidence and best international practice, the participants of the conference endorsed a series of recommendations for the creation of high quality, sustainable and cost-effective healthcare delivery for rural communities in Ireland and globally. The recommendations focused on four major themes: rural healthcare needs and delivery, rural workforce, advocacy and policy, and research for rural health care. Equal access to health care is a crucial marker of democracy. Hence, we call on all governments, policymakers, academic institutions and communities globally to commit to providing their rural dwellers with equitable access to health care that is properly resourced and fundamentally patient-centred in its design.


Assuntos
Serviços de Saúde Rural , Saúde da População Rural , Humanos , Atenção à Saúde , População Rural , Recursos Humanos
5.
Acad Psychiatry ; 47(2): 164-168, 2023 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35879597

RESUMO

OBJECTIVE: Medical students demonstrate disproportionately higher levels of burnout and depression than their non-medical age-matched peers. Few studies have been conducted about rates of treatment acquisition and the barriers to care among students with mental health concerns. This study further characterizes rates of burnout, obstacles to treatment, and program preference for medical students at The University of Michigan. METHODS: In June 2020, a 31-question survey eliciting information regarding student burnout, well-being, barriers to care, and improvements to overcome such barriers was sent to 588 current and recently graduated medical students at The University of Michigan. Participation was anonymous and voluntary, with optional response to each question. RESULTS: Ultimately, 312 (53%) students responded. Pre-clinical and core clinical students were significantly more burned out than clinical elective students, with pre-clinical students' odds ratio (OR) of 2.45 and core clinical students' OR of 2.48. Most participants (81%) reported concerns regarding their emotional well-being. Two-thirds (66%) indicated a new or previously diagnosed mental health concern, with 37% of these students never having sought treatment. Commonly reported barriers to care and suggested improvement to mental health services are outlined. Commonly reported barriers to care were financial concerns, time constraints, and stigma-related fear of career-ending consequences. CONCLUSIONS: This study showed stratification of the high levels of burnout among medical students. Student-driven feedback and survey results can help prompt medical schools to develop more robust mental healthcare models and drive much-needed structural changes.


Assuntos
Esgotamento Profissional , Serviços de Saúde Mental , Estudantes de Medicina , Humanos , Estudantes de Medicina/psicologia , Depressão/psicologia , Esgotamento Profissional/psicologia , Inquéritos e Questionários , Acessibilidade aos Serviços de Saúde
6.
Soc Sci Med ; 296: 114792, 2022 03.
Artigo em Inglês | MEDLINE | ID: mdl-35168057

RESUMO

Ireland does not yet have a comprehensive system of universal access to primary care. In 2015, access to general practitioner (GP) care at no charge was introduced for the 70% of children aged under six who previously paid out-of-pocket fees. This study uses data from 16 practices and a regional out-of-hours (OOH) GP service to assess the impact of this policy on attendance. A difference-in-difference (DiD) analysis was applied to visit records of paediatric patients over a period of five years, two years of which were pre-policy, with treatment and control differentiated by age. Attendance at daytime GP by children aged under-six increased by 20%-21% in the three years following the introduction of the policy, largely explained by an increase in the number of patients attending (17.4%-18.6%). Of children aged under-six attending pre-policy, 14.9%-15.8% had >6 visits annually, increasing to 18.5%-20.3% post-policy. OOH GP attendance also increased by 20.5%-29.4% over the same period. Findings are consistent with international literature on the provision of financially accessible healthcare. Prior unmet need, the provision of additional assessments to children aged under six, parental response to a service at no charge, and rerouting of access to the ED through GP, are all possible contributors to this increased demand. A more integrated policy of boosting supply as well as demand is desirable, particularly in the context of future expansion plans, to ensure the health benefits anticipated from the introduction of this policy have every opportunity to be realised.


Assuntos
Plantão Médico , Medicina Geral , Clínicos Gerais , Criança , Pré-Escolar , Honorários e Preços , Humanos , Políticas
7.
Scand J Prim Health Care ; 38(3): 253-264, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32720874

RESUMO

OBJECTIVE: To explore dementia management from a primary care physician perspective. DESIGN: One-page seven-item multiple choice questionnaire; free text space for every item; final narrative question of a dementia case story. Inductive explorative grounded theory analysis. Derived results in cluster analyses. Appropriateness of dementia drugs assessed by tertiary care specialist. SETTING: Twenty-five European General Practice Research Network member countries. SUBJECTS: Four hundred and forty-five key informant primary care physician respondents of which 106 presented 155 case stories. MAIN OUTCOME MEASURES: Processes and typologies of dementia management. Proportion of case stories with drug treatment and treatment according to guidelines. RESULTS: Unburdening dementia - a basic social process - explained physicians' dementia management according to a grounded theory analysis using both qualitative and quantitative data. Unburdening starts with Recognizing the dementia burden by Burden Identification and Burden Assessment followed by Burden Relief. Drugs to relieve the dementia burden were reported for 130 of 155 patients; acetylcholinesterase inhibitors or memantine treatment in 89 of 155 patients - 60% appropriate according to guidelines and 40% outside of guidelines. More Central and Northern primary care physicians were allowed to prescribe, and more were engaged in dementia management than Eastern and Mediterranean physicians according to cluster analyses. Physicians typically identified and assessed the dementia burden and then tried to relieve it, commonly by drug prescriptions, but also by community health and home help services, mentioned in more than half of the case stories. CONCLUSIONS: Primary care physician dementia management was explained by an Unburdening process with the goal to relieve the dementia burden, mainly by drugs often prescribed outside of guideline indications. Implications: Unique data about dementia management by European primary care physicians to inform appropriate stakeholders. Key points Dementia as a syndrome of cognitive and functional decline and behavioural and psychological symptoms causes a tremendous burden on patients, their families, and society. •We found that a basic social process of Unburdening dementia explained dementia management according to case stories and survey comments from primary care physicians in 25 countries. •First, Burden Recognition by Identification and Assessment and then Burden Relief - often by drugs. •Prescribing physicians repeatedly broadened guideline indications for dementia drugs. The more physicians were allowed to prescribe dementia drugs, the more they were responsible for the dementia work-up. Our study provides unique data about dementia management in European primary care for the benefit of national and international stakeholders.


Assuntos
Demência , Médicos de Atenção Primária , Demência/tratamento farmacológico , Prescrições de Medicamentos , Teoria Fundamentada , Humanos , Padrões de Prática Médica , Inquéritos e Questionários
8.
Geriatr Psychol Neuropsychiatr Vieil ; 18(2): 125-133, 2020 06 01.
Artigo em Francês | MEDLINE | ID: mdl-32554344

RESUMO

The COVID-19 epidemic that started in November in China became a national epidemic from March 16, 2020 with the declaration of population containment in order to reduce the spread of the virus in France. From March 17 to March 27, 2020, the monitoring unit of the French society of geriatrics and gerontology decided to conduct a survey to analyze the implementation of the mobilization of geriatric units, given that this epidemic had shown that it resulted in excess mortality mainly among the elderly. The survey was able to bring together the response of 34 services, nine of which were located in a high epidemic cluster zone. Dedicated acute geriatric units for patients infected with COVID-19 were present in eight facilities, only outside the cluster zones. Nine geriatric follow-up and rehabilitation services were dedicated, an additional telemedicine activity concerned 35% of the facilities, and family listening and tablet communication facilities concerned 36% of the facilities. This survey is a snapshot of an initial moment in the epidemic. It provides an opportunity to describe the context in which this epidemic occurred in terms of geriatric policy, and to assess the responsiveness and inventiveness of these services in meeting the needs of the elderly.


Assuntos
Infecções por Coronavirus/terapia , Geriatria , Unidades Hospitalares/estatística & dados numéricos , Pneumonia Viral/terapia , Idoso , Idoso de 80 Anos ou mais , COVID-19 , Infecções por Coronavirus/epidemiologia , Infecções por Coronavirus/mortalidade , Feminino , França/epidemiologia , Necessidades e Demandas de Serviços de Saúde , Humanos , Masculino , Pandemias , Pneumonia Viral/epidemiologia , Pneumonia Viral/mortalidade , Inquéritos e Questionários , Telemedicina
9.
PLoS One ; 15(5): e0232814, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32413044

RESUMO

BACKGROUND: Cervical cancer screening rates are known to be strongly associated with socioeconomic status. Our objective was to assess whether the rate is also associated with an aggregated deprivation marker, defined by the location of family doctors' offices. METHODS: To access this association, we 1) collected data from the claim database of the French Health Insurance Fund about the registered family doctors and their enlisted female patients eligible for cervical screening; 2) carried out a telephone survey with all registered doctors to establish if they were carrying out Pap-smears in their practices; 3) geotracked all the doctors' offices in the smallest existing blocks of socioeconomic homogenous populations (IRIS census units) that were assigned a census derived marker of deprivation, the European Deprivation Index (EDI), and a binary variable of urbanization; and 4) we used a multivariable linear mixed model with IRIS as a random effect. RESULTS: Of 348 eligible doctors, 343 responded to the telephone survey (98.6%) and were included in the analysis, encompassing 88,152 female enlisted patients aged 25-65 years old. In the multivariable analysis (adjusted by the gender of the family doctor, the practice of Pap-smears by the doctor and the urbanization of the office location), the EDI of the doctor's office was strongly associated with the cervical cancer screening participation rate of eligible patients (p<0.001). CONCLUSION: The EDI linked to the location of the family doctor's office seems to be a robust marker to predict female patients' participation in cervical cancer screening.


Assuntos
Detecção Precoce de Câncer , Neoplasias do Colo do Útero/diagnóstico , Neoplasias do Colo do Útero/epidemiologia , Adulto , Idoso , Feminino , Privação de Alimentos/fisiologia , Humanos , Seguro Saúde , Entrevistas como Assunto , Masculino , Pessoa de Meia-Idade , Teste de Papanicolaou , Consultórios Médicos , Médicos de Família/estatística & dados numéricos , Classe Social , Neoplasias do Colo do Útero/patologia , Neoplasias do Colo do Útero/terapia , Esfregaço Vaginal
10.
Harm Reduct J ; 14(1): 4, 2017 01 13.
Artigo em Inglês | MEDLINE | ID: mdl-28086792

RESUMO

BACKGROUND: Governmental debate in Ireland on the de facto decriminalisation of cannabis and legalisation for medical use is ongoing. A cannabis-based medicinal product (Sativex®) has recently been granted market authorisation in Ireland. This unique study aimed to investigate Irish general practitioner (GP) attitudes toward decriminalisation of cannabis and assess levels of support for use of cannabis for therapeutic purposes (CTP). METHODS: General practitioners in the Irish College of General Practitioner (ICGP) database were invited to complete an online survey. Anonymous data yielded descriptive statistics (frequencies, percentages) to summarise participant demographic information and agreement with attitudinal statements. Chi-square tests and multi-nominal logistic regression were included. RESULTS: The response rate was 15% (n = 565) which is similar to other Irish national GP attitudinal surveys. Over half of Irish GPs did not support the decriminalisation of cannabis (56.8%). In terms of gender, a significantly higher proportion of males compared with females (40.6 vs. 15%; p < 0.0001) agreed or strongly agreed with this drug policy approach. A higher percentage of GPs with advanced addiction specialist training (level 2) agreed/strongly agreed that cannabis should be decriminalised (54.1 vs. 31.5%; p = 0.021). Over 80% of both genders supported the view that cannabis use has a significant effect on patients' mental health and increases the risk of schizophrenia (77.3%). Over half of Irish GPs supported the legalisation of cannabis for medical use (58.6%). A higher percentage of those who were level 1-trained (trained in addiction treatment but not to an advanced level) agreed/strongly agreed cannabis should be legalised for medical use (p = 0.003). Over 60% agreed that cannabis can have a role in palliative care, pain management and treatment of multiple sclerosis (MS). In the regression response predicator analysis, females were 66.2% less likely to agree that cannabis should be decriminalised, 42.5% less likely to agree that cannabis should be legalised for medical use and 59.8 and 37.6% less likely to agree that cannabis has a role in palliative care and in the treatment of multiple sclerosis (respectively) than males. CONCLUSIONS: The majority of Irish GPs do not support the present Irish governmental drug policy of decriminalisation of cannabis but do support the legalisation of cannabis for therapeutic purposes. Male GPs and those with higher levels of addiction training are more likely to support a more liberal drug policy approach to cannabis for personal use. A clear majority of GPs expressed significant concerns regarding both the mental and physical health risks of cannabis use. Ongoing research into the health and other effects of drug policy changes on cannabis use is required.


Assuntos
Atitude do Pessoal de Saúde , Cannabis , Clínicos Gerais/estatística & dados numéricos , Política de Saúde/legislação & jurisprudência , Maconha Medicinal , Inquéritos e Questionários , Adulto , Feminino , Clínicos Gerais/psicologia , Humanos , Irlanda , Masculino , Pessoa de Meia-Idade
11.
J Arthroplasty ; 32(4): 1128-1131, 2017 04.
Artigo em Inglês | MEDLINE | ID: mdl-27923598

RESUMO

BACKGROUND: The use of microscopy and culture screening to detect pathogenic microorganisms followed by a decolonization protocol is a widely performed practice prior to elective hip and knee arthroplasty. In our center, the routine care of hip and knee arthroplasty also involves postoperative screening including direct culture of the surgical site. The aim of this study was to assess the frequency of pathogen detection following these tests and to determine whether routine postoperative screening, with particular reference to postoperative surgical site culture, led to any change in clinical management of these patients. METHODS: A series of 1000 patients undergoing hip or knee arthroplasty at The Mater Hospital between January 2014 and December 2015 were identified from our arthroplasty database. Results of preoperative and postoperative microscopy and culture screening were reviewed by 2 independent researchers. RESULTS: Of the 1000 subjects, positive microscopy and culture results were identified in 88 patients (8.8%) preoperatively and 5 patients (0.5%) postoperatively. None of the 1000 postoperative surgical site swabs had a positive microscopy and culture screen. All the 5 positive postoperative microscopy and culture screen results were in patients who had positive cultures preoperatively. There were no positive postoperative microscopy and culture screen results in patients who had had negative preoperative results. Postoperative screening was performed at a cost of AUS$213 per patient. CONCLUSION: Routine postoperative surgical site culture following hip and knee arthroplasty does not alter clinical management, has a significant associated financial cost, and has the potential to expose the patient to a risk of surgical site infection and is therefore not supported.


Assuntos
Artroplastia de Quadril/métodos , Artroplastia do Joelho/métodos , Técnicas Bacteriológicas/economia , Procedimentos Cirúrgicos Eletivos/economia , Infecção da Ferida Cirúrgica/prevenção & controle , Procedimentos Desnecessários/economia , Humanos , Técnicas Microbiológicas/economia , Microscopia/economia , Pessoa de Meia-Idade , Período Pós-Operatório , Período Pré-Operatório , Infecção da Ferida Cirúrgica/microbiologia
13.
Eur J Cardiovasc Prev Rehabil ; 18(1): 129-35, 2011 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-20606593

RESUMO

BACKGROUND: Heartwatch is a secondary prevention programme of coronary heart disease (CHD) in primary care in Ireland. The aim was to further examine the effect of the Heartwatch programme on cardiovascular risk factors and treatments of patients with a follow-up of 3.5 years. DESIGN: Prospective cohort study of 12,358 patients with established CHD (myocardial infarction, percutaneous cardiac intervention, coronary artery bypass graft) recruited by participating general practitioners; patients invited to attend on a quarterly basis, with continuing care implemented according to defined clinical protocols. METHODS: Changes in risk factors and treatments at 1, 2, 3 and 3.5-year follow-up from baseline were made using paired t-test for continuous and McNemar's test for categorical data. RESULTS: Important changes in systolic and diastolic blood pressure, total and low-density lipoprotein cholesterol and smoking status were observed at 1, 2, 3 and 3.5 years (P < 0.0001) with significant increase in proportions of patients within the target. However, changes in body mass index were small, with no significant improvement in waist circumference. There was a significant increase in prescription of secondary preventive medications and good patient compliance. Males were more likely to be within the target for systolic blood pressure, total cholesterol, waist circumference and exercise level at 3.5 years, but less likely for body mass index. CONCLUSION: Studies of cardiac rehabilitation without any follow-up programmes show that over time patients revert in part to previous lifestyle habits; this primary care-delivered programme has shown sustained improvements in major risk factors, particularly smoking, blood pressure and cholesterol, and treatments for CHD. Weight management presents a greater challenge.


Assuntos
Fármacos Cardiovasculares/uso terapêutico , Doença das Coronárias/etiologia , Doença das Coronárias/reabilitação , Atenção Primária à Saúde , Comportamento de Redução do Risco , Prevenção Secundária/métodos , Idoso , Biomarcadores/sangue , Glicemia/metabolismo , Pressão Sanguínea , Índice de Massa Corporal , Colesterol/sangue , LDL-Colesterol/sangue , Doença das Coronárias/sangue , Doença das Coronárias/fisiopatologia , Prescrições de Medicamentos , Feminino , Seguimentos , Conhecimentos, Atitudes e Prática em Saúde , Humanos , Irlanda , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , Razão de Chances , Cooperação do Paciente , Educação de Pacientes como Assunto , Padrões de Prática Médica , Avaliação de Programas e Projetos de Saúde , Medição de Risco , Fatores de Risco , Fatores Sexuais , Fumar/efeitos adversos , Abandono do Hábito de Fumar , Prevenção do Hábito de Fumar , Fatores de Tempo , Resultado do Tratamento , Circunferência da Cintura
14.
Br J Clin Pharmacol ; 66(4): 498-507, 2008 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-18647303

RESUMO

AIMS: To characterize the cytochrome P450 enzyme(s) responsible for the N-dealkylation of maraviroc in vitro, and predict the extent of clinical drug-drug interactions (DDIs). METHODS: Human liver and recombinant CYP microsomes were used to identify the CYP enzyme responsible for maraviroc N-dealkylation. Studies comprised enzyme kinetics and evaluation of the effects of specific CYP inhibitors. In vitro data were then used as inputs for simulation of DDIs with ketoconazole, ritonavir, saquinavir and atazanvir, using the Simcyptrade mark population-based absorption, distribution, metabolism and elimination (ADME) simulator. Study designs for simulations mirrored those actually used in the clinic. RESULTS: Maraviroc was metabolized to its N-dealkylated product via a single CYP enzyme characterized by a K(m) of 21 microM and V(max) of 0.45 pmol pmol(-1) min(-1) in human liver microsomes and was inhibited by ketoconazole (CYP3A4 inhibitor). In a panel of recombinant CYP enzymes, CYP3A4 was identified as the major CYP responsible for maraviroc metabolism. Using recombinant CYP3A4, N-dealkylation was characterized by a K(m) of 13 microM and a V(max) of 3 pmol pmol(-1) CYP min(-1). Simulations therefore focused on the effect of CYP3A4 inhibitors on maraviroc pharmacokinetics. The simulated median AUC ratios were in good agreement with observed clinical changes (within twofold in all cases), although, in general, there was a trend for overprediction in the magnitude of the DDI. CONCLUSION: Maraviroc is a substrate for CYP3A4, and exposure will therefore be modulated by CYP3A4 inhibitors. Simcyptrade mark has successfully simulated the extent of clinical interactions with CYP3A4 inhibitors, further validating this software as a good predictor of CYP-based DDIs.


Assuntos
Cicloexanos/farmacocinética , Citocromo P-450 CYP3A/metabolismo , Infecções por HIV/tratamento farmacológico , Inibidores da Protease de HIV/farmacocinética , Microssomos Hepáticos/efeitos dos fármacos , Triazóis/farmacocinética , Área Sob a Curva , Sulfato de Atazanavir , Cicloexanos/metabolismo , Interações Medicamentosas , Inibidores da Protease de HIV/metabolismo , HIV-1 , Humanos , Cetoconazol/farmacocinética , Fígado/efeitos dos fármacos , Fígado/enzimologia , Masculino , Maraviroc , Microssomos Hepáticos/enzimologia , Microssomos Hepáticos/metabolismo , Oligopeptídeos/farmacocinética , Valor Preditivo dos Testes , Piridinas/farmacocinética , Ritonavir/farmacocinética , Saquinavir/farmacocinética , Triazóis/metabolismo
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