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1.
Community Health Equity Res Policy ; : 2752535X241238095, 2024 Mar 14.
Artigo em Inglês | MEDLINE | ID: mdl-38486412

RESUMO

OBJECTIVE: The goal of this study was to partner with community organizations to understand the research experiences of communities who speak languages other than English (LOE). METHODS: We conducted semi-structured qualitative interviews in Spanish, Nepali, Mandarin, French, or Kizigua with LOE community members and community leaders who completed recruitment and data collection. Audio-recordings of the interviews were transcribed and translated. We conducted qualitative coding using a mixed deductive-inductive analysis approach and thematic analyses using three rounds of affinity clustering. This study occurred in partnership with an established community-academic collaboration. RESULTS: Thirty community members and six community leaders were interviewed. 83% of LOE participants were born outside of the US and most participants (63%) had never participated in a prior research study. Six themes emerged from this work. Many participants did not understand the concept of research, but those that did thought that inclusion of LOE communities is critical for equity. Even when research was understood as a concept, it was often inaccessible to LOE individuals, particularly because of the lack of language services. When LOE participants engaged in research, they did not always understand their participation. Participants thought that improving research trust was essential and recommended partnering with community organizations and disseminating research results to the community. CONCLUSION: This study's results can serve as an important foundation for researchers seeking to include LOE communities in future research to be more inclusive and scientifically rigorous.

3.
Acad Pediatr ; 23(6): 1151-1158, 2023 08.
Artigo em Inglês | MEDLINE | ID: mdl-36584939

RESUMO

OBJECTIVE: Adolescent relationship abuse (ARA) is associated with myriad negative health outcomes. Pediatric primary care presents an opportunity to engage adolescents and parents, who can be protective against ARA, in ARA prevention; however, no family-focused, health care-based ARA interventions exist. The purpose of this study is to explore the perspectives of adolescents, parents, and health care providers (HCPs) on incorporating ARA prevention into primary care, including 1) current discussions around ARA, 2) how to best include ARA prevention education, and 3) how to address implementation barriers. METHODS: We conducted individual, semi-structured interviews with HCPs, adolescents ages 11 to 15, and parents recruited through convenience sampling. Transcripts were individually coded by 4 study team members (with every third transcript co-coded to assess discrepancies) and analyzed via thematic analysis. RESULTS: Participants identified a need for pediatric HCPs to involve younger adolescents and parents in universal, inclusive ARA prevention and noted that HCPs require training, techniques, and resources around ARA. Participants acknowledged multilevel barriers to implementing primary care-based ARA prevention. They suggested that ARA education be intentionally integrated into HCP and clinic workflows and recommended strategies to garner adolescent and parent buy-in to facilitate ARA-focused conversations. CONCLUSIONS: Pediatric primary care is a promising environment to involve parents and adolescents in universal ARA-prevention. Future research should contextualize these results with larger samples across multiple practice settings and integrate relevant partners in the development and evaluation of evidenced-based ARA prevention for pediatric primary care.


Assuntos
Violência , Humanos , Masculino , Feminino , Adolescente , Atenção Primária à Saúde , Violência/prevenção & controle , Pais , Pessoal de Saúde
4.
JAMA Pediatr ; 177(1): 81-88, 2023 01 01.
Artigo em Inglês | MEDLINE | ID: mdl-36315130

RESUMO

Importance: The inclusion of non-English-speaking (NES) participants in pediatric research is an essential step to improving health equity for these populations. Although some studies have shown lack of progress in NES research participation in the past decade, few have examined NES inclusivity in pediatric research or details about the practices that researchers have used to communicate with NES participants. Objective: To assess how frequently NES families were included in pediatric research, how rates of inclusion changed over time, what languages were included, and methodological details about oral and written communication with NES participants. Evidence Review: In this review, all original investigation articles published in JAMA Pediatrics, Pediatrics, and The Journal of Pediatrics between January 2012 and November 2021 were screened. Eligible articles, which included those based in the US and with human participants, were reviewed to determine whether they included or excluded NES participants or whether or not there was specific mention of language. A second-round review was conducted on the subset of articles that included NES participants to determine methodological details (eg, languages included, type of study, region where the study was located, and oral and written communication practices with NES participants). Findings: Of the 8142 articles screened, 5008 (62%) met inclusion criteria; of these, 469 (9%) included NES participants. The most common language was Spanish (350 [75%]); 145 articles (31%) reported non-English or other language without specification. A total of 230 articles (49%) reported the number of NES participants, and 61 (13%) specified the methods used to determine whether participants preferred a language other than English. In all, 101 (22%) and 136 (29%) articles specified how oral and written communication occurred with NES participants, respectively. Conclusions and Relevance: This review of 3 pediatric journals provides preliminary evidence suggesting exclusion of NES communities from pediatric research from 2012 to 2021 and highlights an opportunity to provide more methodological detail about communication with NES participants. Best practices for improving inclusivity of NES participants are needed to guide researchers toward improved methods and more relevant results.


Assuntos
Comunicação , Idioma , Criança , Humanos , Pesquisa , Pesquisadores
5.
Prog Community Health Partnersh ; 16(2S): 23-32, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35912654

RESUMO

BACKGROUND: To ensure equity in coronavirus disease 2019 (COVID-19) vaccine access, it is critical that Black and Latine communities receive trustworthy COVID-19 information. This study uses community-based participatory research to understand sources of COVID-19 information for Black and Latine adults, how trustworthy that information is, and relationships between information sources and COVID-19 vaccine intention. METHODS: We co-created a survey in Spanish and English and distributed it to Black and Latine adults residing in the Pittsburgh area. Data were analyzed using descriptive statistics and multivariate logistic regression. RESULTS: There were 574 participants who completed the survey. Participants reported accessing a variety of COVID-19 information sources and generally trusted these sources. Few sources of information were associated with COVID-19 vaccine intention. We also review lessons learned from our community-academic collaboration. CONCLUSIONS: Trustworthy COVID-19 information sources may not be sufficient for increasing vaccine intention. Results can help other community-academic partnerships working to improve COVID-19 vaccine equity.


Assuntos
COVID-19 , Adulto , Humanos , Pesquisa Participativa Baseada na Comunidade , COVID-19/prevenção & controle , Vacinas contra COVID-19 , Hispânico ou Latino , Inquéritos e Questionários , Negro ou Afro-Americano , Comunicação em Saúde
6.
Pediatrics ; 149(2)2022 02 01.
Artigo em Inglês | MEDLINE | ID: mdl-35098300

RESUMO

CONTEXT: Culturally sensitive interventions in the pediatric primary care setting may help reduce health disparities. Less is known on the development of these interventions, their target groups, and their feasibility, acceptability, and impact on health outcomes. OBJECTIVE: We conducted a systematic review to describe culturally sensitive interventions developed for the pediatric primary care setting. DATA SOURCES: PubMed, Web of Science, Cumulative Index to Nursing and Allied Health Literature, and PsycInfo (January 2000 to July 2020). STUDY SELECTION: Studies were eligible for inclusion if they were (1) original research on an intervention with an evaluation, (2) within a pediatric primary care setting, (3) not limited to education for providers, (4) not limited to interpreter use, and (5) based in the United States. DATA EXTRACTION: The following were extracted: study topic, study design, intervention, cultural sensitivity strategies and terminology, setting, target group, sample size, feasibility, acceptability, and health outcomes. RESULTS: Twenty-five studies described 23 interventions targeting a variety of health topics. Multiple cultural sensitivity strategies were used, most commonly sociocultural (83%). Most interventions (57%) were focused on Hispanic/Latino families. Interventions were generally reported as being feasible and acceptable; some also changed health outcomes. LIMITATIONS: Small samples and heterogenous methods subject to bias were used. Relevant articles may have been missed because of the variety of terms used to describe cultural sensitivity. CONCLUSIONS: The included articles provide preliminary evidence that culturally sensitive interventions can be feasible and effective and may help eliminate disparities for patients from communities with barriers to equitable care.


Assuntos
Competência Cultural/psicologia , Pediatria/métodos , Atenção Primária à Saúde/métodos , Determinantes Sociais da Saúde/etnologia , Criança , Humanos , Pediatria/tendências , Atenção Primária à Saúde/tendências , Determinantes Sociais da Saúde/tendências
7.
AMA J Ethics ; 23(6): E465-470, 2021 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-34212847

RESUMO

Pediatricians have obligations to respond with care to all children's clinical and social vulnerabilities. Finding and addressing causes of children's stress (ie, family separation, child abuse, and trauma) are also obligations. Preventive and rescue interventions should be implemented to address potential short- and long-term harms of toxic stress and their short- and long-term consequences.


Assuntos
Maus-Tratos Infantis , Criança , Proteção da Criança , Humanos
8.
Pediatr Clin North Am ; 68(2): 371-387, 2021 04.
Artigo em Inglês | MEDLINE | ID: mdl-33678292

RESUMO

In Latin America, violence is a major public health issue causing many families to flee to the United States to seek safety. Current US immigration policies fail to address why families are forced to depart their home country or the needs of families once arriving in the United States. This article identifies root causes of family displacement, examines the insufficient protections for children in families during US immigration processing, and provides practice and policy recommendations on how to transform the US immigration system so that it is more humane for children and families forcibly displaced by violence.


Assuntos
Proteção da Criança/legislação & jurisprudência , Emigração e Imigração/legislação & jurisprudência , Migração Humana , Política Pública , Violência/estatística & dados numéricos , Criança , Defesa da Criança e do Adolescente/legislação & jurisprudência , Migração Humana/legislação & jurisprudência , Humanos , América Latina , Psicologia da Criança , Estados Unidos , Violência/psicologia
9.
Acad Pediatr ; 21(4): 677-683, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33065291

RESUMO

OBJECTIVE: To identify unmet health and social resource needs during a county-wide coronavirus disease 19 (COVID-19) stay-at-home order and phased re-opening in Western Pennsylvania. METHODS: With public health, social service, and community partners connected through an ongoing academic-community collaborative, we developed and fielded a weekly repeated cross-sectional electronic survey assessing usage of and unmet need for health and social service resources. Using 10 weeks of surveys (April 3-June 11, 2020) by Allegheny County residents, we examined variation in responses by week and by sociodemographic characteristics using chi-square tests. We shared written reports weekly and discussed emerging trends with community partners. RESULTS: Participants ranged from 229 to 1001 per week. Unmet need for at least 1 health or health-related social need resource varied by week, ranging from 55% (95% confidence interval [CI] 50%-59%) of participants in week 2 to 43% (95% CI 37%-49%) of participants in week 9 (P = .006). Increased use of at least 1 resource ranged from 53% (95% CI 47%-58%) of participants in week 3 to 36% (95% CI 31%-42%) in week 9 (P < .001). Unmet need for food and financial assistance peaked early during the stay-at-home order, while unmet need for mental health care rose later. Unmet need for food assistance varied significantly by race and ethnicity and by household prepandemic income. CONCLUSIONS: Over half of families with children reported unmet health or social service needs during the first month of a county-wide COVID-19 stay-at-home order. Unmet needs varied with race, ethnicity, and income and with duration of the stay-at-home order.


Assuntos
COVID-19 , Serviços de Saúde/estatística & dados numéricos , Serviço Social , Adulto , Criança , Estudos Transversais , Feminino , Necessidades e Demandas de Serviços de Saúde , Humanos , Renda , Pennsylvania , SARS-CoV-2
10.
Artigo em Inglês | MEDLINE | ID: mdl-31572615

RESUMO

BACKGROUND: Latinas are at a higher risk than Caucasians for both type 1 and type 2 diabetes (DM), as well as DM-associated reproductive health (RH) complications. Healthcare providers (HCPs) should deliver culturally-sensitive care to enhance the care relationship between Latinos and HCPs and to improve patient outcomes. This study explored an expert panel's cultural understanding, experiences, barriers, and facilitators regarding RH and preconception counseling (PC) for adolescent Latinas with DM and their families. METHODS: This study used open-ended questions with a focus group of 8 HCPs from the mid-Atlantic, Southwest, and Northwest regions of the United States in a teleconference format. Two researchers transcribed and reviewed the transcript for accuracy. Using content analysis, four members of the team identified themes. All researchers discussed themes and a 100% consensus was reached. For confirmation, a coding protocol was created based on the emerging themes. RESULTS: Five themes related to cultural understanding and experiences were identified: 1) issues of identity; 2) acculturation; 3) stigma; 4) ambivalence toward birth control, RH education, and PC; and 5) cultural sensitivity vs. best practice. Four barriers were identified: 1) language; 2) religion; 3) access to healthcare, and 4) discomfort with discussion. Ten facilitators were identified: 1) the importance of support and support networks; 2) promoting trust among HCPs, daughters, and families; 3) assessing emotional development; 4) empowerment; 5) emphasizing safety; 6) communicating in patients' preferred language; 7) discussing RH-related topics and PC using cultural sensitivity; 8) importance of being ready/temporality/planning for the future; 9) the importance of family-centered care; and 10) variation in educational tailoring and dissemination/ care delivery. CONCLUSIONS: Findings support the need for culturally sensitive and developmentally appropriate PC programs to empower adolescent Latinas with DM.

11.
J Racial Ethn Health Disparities ; 3(3): 466-72, 2016 09.
Artigo em Inglês | MEDLINE | ID: mdl-27294734

RESUMO

A woman's birth experience can impact the physical and mental well-being of mothers long after the birth of their child. Little is known about the experiences of Latina women in areas with small, yet growing Latino populations. To understand Latina's perceptions of their childbirth experience and to see how insurance status impacts that experience, we conducted in-depth, semi-structured interviews with a non-proportional quota sampling of ten Latina women, five with and five without health insurance. Most women reported a positive global experience; the birth of a healthy child was the most important factor influencing birth experiences for all of them. Locus of control and support from medical providers and loved ones also shaped experiences. Uninsured women reported lower levels of perceived control and support, which did impact their birthing experience. These differences could be influenced by social status and position. Medical provider, hospital, and policy recommendations are made which could lead to improvements in uninsured Latinas' childbirth experiences.


Assuntos
Emigrantes e Imigrantes , Hispânico ou Latino , Saúde Mental , Parto , Adulto , Feminino , Humanos , Mães , Gravidez
12.
Qual Health Res ; 24(2): 232-41, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-24469693

RESUMO

The study described here was designed to determine treatment preferences among Latinas to identify treatment options that meet their needs and increase their engagement. Focus group interviews were conducted with 22 prenatal and postpartum Latinas at risk for depression. The group interviews were conducted in Spanish and English using a standardized interview protocol. Focus group transcripts were analyzed to identify themes regarding perinatal depression coping strategies, preferred approaches to treating perinatal depression, and recommendations for engaging perinatal Latinas in treatment. The results suggest that Latinas' treatment preferences consist of a pathway (i.e., hierarchical) approach that begins with the use of one's own resources, followed by the use of formal support systems (e.g., home-visiting nurse), and supplemented with the use of behavioral therapy. Antidepressant use was judged to be acceptable only in severe cases or after delivery. The data indicate that to increase health-seeking behaviors among perinatal Latinas, practitioners should first build trust.


Assuntos
Depressão/psicologia , Depressão/terapia , Hispânico ou Latino/psicologia , Mães/psicologia , Preferência do Paciente , Adaptação Psicológica , Adolescente , Adulto , Antidepressivos/uso terapêutico , Feminino , Grupos Focais , Humanos , Pennsylvania , Cuidado Pós-Natal , Gravidez , Cuidado Pré-Natal , Fatores de Risco , Apoio Social
13.
Diabetes Care ; 33(12): 2674-6, 2010 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-21115769

RESUMO

OBJECTIVE: To determine whether elevated fasting or 2-h plasma glucose and/or insulin better reflects the presence of cardiovascular disease (CVD) risk markers in an overweight pediatric population with normal glucose tolerance. RESEARCH DESIGN AND METHODS: A total of 151 overweight youths (8-17 years old) were evaluated with oral glucose tolerance tests and measurement of CVD risk factors. The study population was categorized according to quartiles of fasting and 2-h glucose and insulin levels. ANCOVA, adjusted for age, sex, race, Tanner stage, and percent body fat (measured by dual-energy X-ray absorptiometry), was used to compare metabolic variables between the quartiles of glucose and insulin groups. RESULTS: Increasing quartiles of fasting and 2-h insulin were associated with increasing CVD risk factors. Glucose quartiles on the other hand, either fasting or at 2 h, were not. CONCLUSIONS: These data suggest that hyperinsulinemia may be the earliest and/or primary metabolic alteration in childhood associated with risk markers for CVD. Prospective studies are needed.


Assuntos
Doenças Cardiovasculares/sangue , Jejum/sangue , Insulina/sangue , Sobrepeso/sangue , Adolescente , Glicemia/metabolismo , Criança , Feminino , Humanos , Masculino , Fatores de Risco
14.
Child Dev ; 79(6): 1853-68, 2008.
Artigo em Inglês | MEDLINE | ID: mdl-19037954

RESUMO

In a prospective study of developmental outcomes in relation to early-life otitis media, behavioral, cognitive, and language measures were administered to a large, diverse sample of children at 2, 3, 4, 6, and 9-11 years of age (N = 741). At 9-11 years of age, 9% of the children were categorized as having attention-deficit/hyperactivity disorder (ADHD) based on parent report. Compared to the non-ADHD group, the ADHD group had higher (i.e., less favorable) scores on parent and teacher versions of the Child Behavior Checklist at all ages. Children in the ADHD group also had lower scores on cognitive and receptive language measures in preschool. The findings support the concept that ADHD is a cognitive as well as a behavioral disorder.


Assuntos
Transtorno do Deficit de Atenção com Hiperatividade/diagnóstico , Transtorno do Deficit de Atenção com Hiperatividade/epidemiologia , Criança , Pré-Escolar , Transtornos Cognitivos/diagnóstico , Transtornos Cognitivos/epidemiologia , Diagnóstico Precoce , Feminino , Humanos , Masculino , Índice de Gravidade de Doença , Escalas de Wechsler
15.
Clin Pharmacol Ther ; 80(3): 235-45, 2006 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-16952490

RESUMO

BACKGROUND: The liver plays a significant role in drug metabolism; thus it would be expected that liver disease may have a detrimental effect on the activity of cytochrome P450 (CYP) enzymes. The extent to which the presence and severity of liver disease affect the activity of different individual drug-metabolizing enzymes is still not well characterized. The purpose of this study was to assess the effect of liver disease on multiple CYP enzymes by use of a validated cocktail approach. METHODS: The participants in this investigation were 20 patients with different etiologies and severity of liver disease and 20 age-, sex-, and weight-matched healthy volunteers. Liver disease severity was categorized by use of the Child-Pugh score. All participants received a cocktail of 4 oral drugs simultaneously, caffeine, mephenytoin, debrisoquin (INN, debrisoquine), and chlorzoxazone, as in vivo probes of the drug-metabolizing enzymes CYP1A2, CYP2C19, CYP2D6, and CYP2E1, respectively. The primary end points were measurements of specific CYP metabolism indexes for each enzyme. RESULTS: Mephenytoin metabolism was significantly decreased in both patients with mild liver disease (Child-Pugh score of 5/6) (-63% [95% confidence interval (CI), -86% to -40%]; P = .0003) and patients with moderate to severe liver disease (Child-Pugh score >6) (-80% [95% CI, -95% to -64%]; P = .0003). In comparison with control subjects, the caffeine metabolic ratio was 69% lower (95% CI, -85% to -54%; median, 0.14 versus 0.62; P = .0003), the debrisoquin recovery ratio was 71% lower (95% CI, -96% to -47%; median, 0.10 versus 0.65; P = .012), and the chlorzoxazone metabolic ratio was 60% lower (95% CI, -91% to -29%; median, 0.21 versus 0.83; P = .0111) in patients with moderate to severe liver disease. All 4 drugs showed significant negative relationships with the Child-Pugh score. CONCLUSIONS: CYP enzyme activity is differentially affected by the presence of liver disease. We propose that the data can be explained by the "sequential progressive model of hepatic dysfunction," whereby liver disease severity has a differential effect on the metabolic activity of specific CYP enzymes.


Assuntos
Sistema Enzimático do Citocromo P-450/metabolismo , Hepatopatias/metabolismo , Administração Oral , Adulto , Anticonvulsivantes/administração & dosagem , Anticonvulsivantes/metabolismo , Anticonvulsivantes/farmacocinética , Anti-Hipertensivos/administração & dosagem , Anti-Hipertensivos/metabolismo , Anti-Hipertensivos/farmacocinética , Cafeína/administração & dosagem , Cafeína/metabolismo , Cafeína/farmacocinética , Estudos de Casos e Controles , Clorzoxazona/administração & dosagem , Clorzoxazona/metabolismo , Clorzoxazona/farmacocinética , Inibidores das Enzimas do Citocromo P-450 , Debrisoquina/administração & dosagem , Debrisoquina/metabolismo , Debrisoquina/farmacocinética , Humanos , Isoenzimas/antagonistas & inibidores , Isoenzimas/metabolismo , Hepatopatias/fisiopatologia , Masculino , Mefenitoína/administração & dosagem , Mefenitoína/análogos & derivados , Mefenitoína/metabolismo , Mefenitoína/farmacocinética , Mefenitoína/urina , Pessoa de Meia-Idade , Relaxantes Musculares Centrais/administração & dosagem , Relaxantes Musculares Centrais/metabolismo , Relaxantes Musculares Centrais/farmacocinética , Inibidores de Fosfodiesterase/administração & dosagem , Inibidores de Fosfodiesterase/metabolismo , Inibidores de Fosfodiesterase/farmacocinética , Índice de Gravidade de Doença , Teofilina/metabolismo
16.
Clin Pharmacol Ther ; 76(6): 618-27, 2004 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-15592333

RESUMO

BACKGROUND AND OBJECTIVE: The activity of cytochrome P450 (CYP) enzymes, which determine the rate of elimination of lipid-soluble drugs, demonstrates considerable interindividual variability. The extent to which age and sex influence CYP activity remains unclear in humans. Our objectives were to determine whether in vivo activity of selected CYP enzymes is affected by age or sex and to evaluate sex bioequivalence in a large sample size. METHODS: We have assessed in vivo activity of the CYP1A2, 2C19, 2D6, 2E1, and 3A4 enzymes in 161 normal subjects (51% female subjects and 40% aged >50 years). After simultaneous administration of a cocktail of selective probes (caffeine, mephenytoin, debrisoquin [INN, debrisoquine], chlorzoxazone, and dapsone, respectively), phenotypic indices for metabolism of these drugs were used as measures of individual CYP activity. Sex bioequivalence analysis used the bootstrap method. RESULTS: There were no sex differences associated with CYP1A2 activity. A significant negative correlation (r = -0.572, P < .01) between enzyme activity and age was observed for CYP2C19, but there were no sex differences. CYP2D6 activity showed no dependence on age or sex. In contrast, CYP2E1 activity showed an age-associated increase (r = 0.393, P < .01), which developed earlier in life in male subjects compared with female subjects. These results were further supported by the sex bioequivalence analysis of CYP phenotypic activity, which revealed that sexes were equivalent with respect to CYP2C19 (90% confidence interval [CI], 0.874-1.04), CYP3A4 (90% CI, 0.95-1.176), and CYP2D6 (90% CI, 0.928-1.09) phenotype and just exceeded the 0.8 to 1.25 limits to be equivalent with respect to CYP2E1 (90% CI, 0.785-1.08) and CYP1A2 (90% CI, 0.736-1.03) phenotype. CONCLUSION: These observations suggest that the presence of selective mechanisms of regulation for individual CYP enzymes can be influenced by age and sex. However, we suggest that sex has a limited ability to explain intersubject variation of activity for these phenotypic measures of CYP enzyme activity.


Assuntos
Envelhecimento/metabolismo , Sistema Enzimático do Citocromo P-450/metabolismo , Equivalência Terapêutica , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Algoritmos , Cromatografia Líquida de Alta Pressão , Sistema Enzimático do Citocromo P-450/genética , Feminino , Genótipo , Humanos , Isoenzimas/genética , Isoenzimas/metabolismo , Masculino , Pessoa de Meia-Idade , Modelos Estatísticos , Fenótipo , Caracteres Sexuais
17.
Clin Pharmacol Ther ; 72(6): 718-28, 2002 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-12496753

RESUMO

OBJECTIVES: Determination of hepatic and intestinal cytochrome P450 (CYP) 3A activity is important, because CYP3A substrates show substantial variability in plasma concentrations as a result of variations in both hepatic and intestinal metabolism. The goals of this study were (1) to determine whether the hepatic and intestinal extraction ratios (ER(H) and ER(G), respectively) of the CYP3A probe drug midazolam are different when determined after semisimultaneous administration, as compared with administration on separate occasions (traditional method), and (2) to evaluate the hepatic and intestinal metabolism of midazolam in the presence and absence of ketoconazole by the semisimultaneous method. METHODS: Midazolam pharmacokinetics was assessed in 12 healthy volunteers after administration of midazolam, 5 mg orally, followed at 6 hours by 2 mg given by intravenous infusion. Concentration-time data were fitted to a combined oral-intravenous infusion model by nonlinear regression (semisimultaneous method). Data from the semisimultaneous method were compared with those obtained after individual midazolam doses, 1 week apart (traditional approach). The effect of ketoconazole on midazolam pharmacokinetics after semisimultaneous administration was also determined in 4 healthy volunteers. RESULTS: There were no significant differences in bioavailability (0.343 +/- 0.100 versus 0.343 +/- 0.094), ER(H) (0.269 +/- 0.064 versus 0.267 +/- 0.077), and ER(G) (0.534 +/- 0.135 versus 0.531 +/- 0.124) between the traditional and semisimultaneous methods. As expected, ketoconazole markedly increased the mean bioavailability to 0.838 (2.4-fold), the mean ER(H) was decreased 3.7-fold, and the mean ER(G) was decreased 5.7-fold. CONCLUSIONS: Midazolam pharmacokinetic parameters that are specific to liver and intestinal metabolism were not different between the traditional and semisimultaneous methods. The semisimultaneous method also yielded expected marked changes in the parameters as a result of ketoconazole inhibition. Thus the semisimultaneous midazolam method appears to be a suitable approach to determine hepatic and intestinal CYP3A activity at baseline and with enzyme inhibition.


Assuntos
Ansiolíticos/administração & dosagem , Ansiolíticos/farmacocinética , Hidrocarboneto de Aril Hidroxilases/efeitos dos fármacos , Mucosa Intestinal/metabolismo , Fígado/metabolismo , Midazolam/administração & dosagem , Midazolam/farmacocinética , Oxirredutases N-Desmetilantes/efeitos dos fármacos , Administração Oral , Adolescente , Adulto , Ansiolíticos/sangue , Área Sob a Curva , Disponibilidade Biológica , Biomarcadores/sangue , Estudos Cross-Over , Citocromo P-450 CYP3A , Esquema de Medicação , Feminino , Cromatografia Gasosa-Espectrometria de Massas , Humanos , Infusões Intravenosas , Intestinos/efeitos dos fármacos , Cetoconazol/farmacologia , Fígado/efeitos dos fármacos , Masculino , Midazolam/sangue , Pessoa de Meia-Idade , Fenótipo , Valores de Referência
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