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1.
N Engl J Med ; 386(10): 911-922, 2022 03 10.
Artigo em Inglês | MEDLINE | ID: mdl-35263517

RESUMO

BACKGROUND: Two thirds of children with tuberculosis have nonsevere disease, which may be treatable with a shorter regimen than the current 6-month regimen. METHODS: We conducted an open-label, treatment-shortening, noninferiority trial involving children with nonsevere, symptomatic, presumably drug-susceptible, smear-negative tuberculosis in Uganda, Zambia, South Africa, and India. Children younger than 16 years of age were randomly assigned to 4 months (16 weeks) or 6 months (24 weeks) of standard first-line antituberculosis treatment with pediatric fixed-dose combinations as recommended by the World Health Organization. The primary efficacy outcome was unfavorable status (composite of treatment failure [extension, change, or restart of treatment or tuberculosis recurrence], loss to follow-up during treatment, or death) by 72 weeks, with the exclusion of participants who did not complete 4 months of treatment (modified intention-to-treat population). A noninferiority margin of 6 percentage points was used. The primary safety outcome was an adverse event of grade 3 or higher during treatment and up to 30 days after treatment. RESULTS: From July 2016 through July 2018, a total of 1204 children underwent randomization (602 in each group). The median age of the participants was 3.5 years (range, 2 months to 15 years), 52% were male, 11% had human immunodeficiency virus infection, and 14% had bacteriologically confirmed tuberculosis. Retention by 72 weeks was 95%, and adherence to the assigned treatment was 94%. A total of 16 participants (3%) in the 4-month group had a primary-outcome event, as compared with 18 (3%) in the 6-month group (adjusted difference, -0.4 percentage points; 95% confidence interval, -2.2 to 1.5). The noninferiority of 4 months of treatment was consistent across the intention-to-treat, per-protocol, and key secondary analyses, including when the analysis was restricted to the 958 participants (80%) independently adjudicated to have tuberculosis at baseline. A total of 95 participants (8%) had an adverse event of grade 3 or higher, including 15 adverse drug reactions (11 hepatic events, all but 2 of which occurred within the first 8 weeks, when the treatments were the same in the two groups). CONCLUSIONS: Four months of antituberculosis treatment was noninferior to 6 months of treatment in children with drug-susceptible, nonsevere, smear-negative tuberculosis. (Funded by the U.K. Medical Research Council and others; SHINE ISRCTN number, ISRCTN63579542.).


Assuntos
Antituberculosos/administração & dosagem , Tuberculose/tratamento farmacológico , Adolescente , África , Criança , Pré-Escolar , Esquema de Medicação , Quimioterapia Combinada , Feminino , Humanos , Índia , Lactente , Análise de Intenção de Tratamento , Isoniazida/administração & dosagem , Masculino , Gravidade do Paciente , Pirazinamida/administração & dosagem , Rifampina/administração & dosagem , Resultado do Tratamento
2.
Clin Infect Dis ; 79(1): 70-77, 2024 Jul 19.
Artigo em Inglês | MEDLINE | ID: mdl-38592950

RESUMO

BACKGROUND: Children with human immunodeficiency virus (HIV, CWH) are at high risk of tuberculosis (TB) and face poor outcomes, despite antiretroviral therapy (ART). We evaluated outcomes in CWH and children not living with HIV treated for nonsevere TB in the SHINE trial. METHODS: SHINE was a randomized trial that enrolled children aged <16 years with smear-negative, nonsevere TB who were randomized to receive 4 versus 6 months of TB treatment and followed for 72 weeks. We assessed TB relapse/recurrence, mortality, hospitalizations, grade ≥3 adverse events by HIV status, and HIV virological suppression in CWH. RESULTS: Of 1204 children enrolled, 127 (11%) were CWH, of similar age (median, 3.6 years; interquartile range, 1.2, 10.3 versus 3.5 years; 1.5, 6.9; P = .07) but more underweight (weight-for-age z score, -2.3; (3.3, -0.8 versus -1.0; -1.8, -0.2; P < .01) and anemic (hemoglobin, 9.5 g/dL; 8.7, 10.9 versus 11.5 g/dL; 10.4, 12.3; P < .01) compared with children without HIV. A total of 68 (54%) CWH were ART-naive; baseline median CD4 count was 719 cells/mm3 (241-1134), and CD4% was 16% (10-26). CWH were more likely to be hospitalized (adjusted odds ratio, 2.4; 1.3-4.6) and to die (adjusted hazard ratio [aHR], 2.6; 95% confidence interval [CI], 1.2 to 5.8). HIV status, age <3 years (aHR, 6.3; 1.5, 27.3), malnutrition (aHR, 6.2; 2.4, 15.9), and hemoglobin <7 g/dL (aHR, 3.8; 1.3,11.5) independently predicted mortality. Among children with available viral load (VL), 45% and 61% CWH had VL <1000 copies/mL at weeks 24 and 48, respectively. There was no difference in the effect of randomized treatment duration (4 versus 6 months) on TB treatment outcomes by HIV status (P for interaction = 0.42). CONCLUSIONS: We found no evidence of a difference in TB outcomes between 4 and 6 months of treatment for CWH treated for nonsevere TB. Irrespective of TB treatment duration, CWH had higher rates of mortality and hospitalization than their counterparts without HIV. Clinical Trials Registration. ISRCTN63579542.


Assuntos
Antituberculosos , Infecções por HIV , Tuberculose , Humanos , Infecções por HIV/tratamento farmacológico , Infecções por HIV/complicações , Masculino , Feminino , Pré-Escolar , Criança , Lactente , Tuberculose/tratamento farmacológico , Tuberculose/mortalidade , Resultado do Tratamento , Antituberculosos/uso terapêutico , Hospitalização , Carga Viral/efeitos dos fármacos , Recidiva , Contagem de Linfócito CD4 , Adolescente , Fármacos Anti-HIV/uso terapêutico
3.
Pflugers Arch ; 2024 Apr 19.
Artigo em Inglês | MEDLINE | ID: mdl-38637408

RESUMO

Human arachidonate 15-lipoxygenase type B is a lipoxygenase that catalyzes the peroxidation of arachidonic acid at carbon-15. The corresponding murine ortholog however has 8-lipoxygenase activity. Both enzymes oxygenate polyunsaturated fatty acids in S-chirality with singular reaction specificity, although they generate a different product pattern. Furthermore, while both enzymes utilize both esterified fatty acids and fatty acid hydro(pero)xides as substrates, they differ with respect to the orientation of the fatty acid in their substrate-binding pocket. While ALOX15B accepts the fatty acid "tail-first," Alox8 oxygenates the free fatty acid with its "head-first." These differences in substrate orientation and thus in regio- and stereospecificity are thought to be determined by distinct amino acid residues. Towards their biological function, both enzymes share a commonality in regulating cholesterol homeostasis in macrophages, and Alox8 knockdown is associated with reduced atherosclerosis in mice. Additional roles have been linked to lung inflammation along with tumor suppressor activity. This review focuses on the current knowledge of the enzymatic activity of human ALOX15B and murine Alox8, along with their association with diseases.

4.
Fam Process ; 2024 Mar 20.
Artigo em Inglês | MEDLINE | ID: mdl-38506141

RESUMO

The present study aimed to explore the relationship between emotional intimate partner violence (IPV) and different forms of violence (e.g., stalking perpetration and victimization, physical IPV perpetration and victimization, sexual IPV perpetration and victimization, and controlling behaviors) using a meta-analysis. Data from 188 studies, yielding 382 effect sizes, were used to compare the strength of correlates for IPV victimization versus perpetration, as well as gendered results. This meta-analysis found, in order of strength, controlling behaviors victimization, physical IPV victimization, physical IPV perpetration, sexual IPV victimization, stalking victimization, and sexual IPV perpetration were significantly associated with emotional IPV victimization. The meta-analysis also found, in order of strength, emotional IPV perpetration was positively associated with stalking perpetration, physical IPV perpetration, causing injury to a partner, controlling behaviors victimization, sexual IPV perpetration, physical IPV victimization, controlling behaviors perpetration, and sexual IPV victimization. This study found limited significant differences around gender, with physical IPV victimization approaching significance for emotional IPV perpetration for women. The current study highlights the implications associated with early assessment and intervention in cases of IPV.

5.
Artigo em Inglês | MEDLINE | ID: mdl-39305401

RESUMO

As academic medical centers have moved away from using learner ratings of instruction as a demonstration of quality teaching in the promotion process, Indiana University School of Medicine sought to create a peer review of teaching system. We created our system in 2010 and have engaged in continuous quality improvement since. In these efforts, we sought to answer the question, "How can we create a system of peer review of teaching that provides high-quality feedback to faculty and encourages autonomy and growth?" Our peer review of teaching system includes a website, with a brief introduction to the concept of peer review, as well as a series of customizable forms that allows faculty and peer reviewers to choose items for observation and feedback based on teaching setting. This system, called the Peer Review Form Builder (PRFB), combines interactive technology with evidence-based faculty development and is innovative in structure and scope. On the macro level, departments and programs have seen success with the tool by engendering conversations on the values and effectiveness of teaching and education efforts. This systematic, tailored system of peer review of teaching has advanced the stature, quality, and innovation within all aspects of teaching throughout the institution. Further, we have incorporated these values into promotion and tenure documents, by encouraging consistent, systematic peer review as a primary source of evidence to demonstrate teaching effectiveness.

6.
J Antimicrob Chemother ; 78(10): 2481-2488, 2023 10 03.
Artigo em Inglês | MEDLINE | ID: mdl-37596982

RESUMO

BACKGROUND: Levofloxacin is used for treatment and prevention of rifampicin-resistant (RR)-TB in children. Recent data showed higher exposures with 100 mg dispersible compared with non-dispersible tablet formulations with potentially important dosing implications in children. We aimed to verify and better characterize this finding. METHODS: We conducted a crossover pharmacokinetic trial in children aged ≤5 years receiving levofloxacin RR-TB preventive therapy. Pharmacokinetic sampling was done after 15-20 mg/kg doses of levofloxacin with 100 mg dispersible and crushed 250 mg non-dispersible levofloxacin formulations. A population pharmacokinetic model was developed. RESULTS: Twenty-five children were included, median (IQR) weight and age 12.2 (10.7-15.0) kg and 2.56 (1.58-4.03) years, respectively. A two-compartment model with first-order elimination and transit compartment absorption best described levofloxacin pharmacokinetics. Allometric scaling adjusted for body size, and maturation of clearance with age was characterized. Typical clearance in a 12 kg child was estimated at 4.17 L/h. Non-dispersible tablets had 21.5% reduced bioavailability compared with the dispersible formulation, with no significant differences in other absorption parameters.Dosing simulations showed that current recommended dosing for both formulations result in median exposures below adult-equivalent exposures at a 750 mg daily dose, mainly in children >6 months. Higher levofloxacin doses of 16-30 mg/kg for dispersible and 20-38 mg/kg for crushed non-dispersible tablets may be required in children >6 months. CONCLUSIONS: The dispersible paediatric levofloxacin formulation has improved bioavailability compared with the crushed non-dispersible adult formulation, but exposures remain below those in adults. We propose optimized age- and weight-based dosing for levofloxacin, which require further evaluation.


Assuntos
Levofloxacino , Rifampina , Adulto , Pré-Escolar , Humanos , Disponibilidade Biológica , Estudos Cross-Over , Comprimidos , Lactente
7.
Curr Opin Pediatr ; 35(2): 166-175, 2023 04 01.
Artigo em Inglês | MEDLINE | ID: mdl-36749063

RESUMO

PURPOSE OF REVIEW: The current review identifies recent advances in the prevention, diagnosis, and treatment of childhood tuberculosis (TB) with a focus on the WHO's updated TB management guidelines released in 2022. RECENT FINDINGS: The COVID-19 pandemic negatively affected global TB control due to the diversion of healthcare resources and decreased patient care-seeking behaviour. Despite this, key advances in childhood TB management have continued. The WHO now recommends shorter rifamycin-based regimens for TB preventive treatment as well as shorter regimens for the treatment of both drug-susceptible and drug-resistant TB. The Xpert Ultra assay is now recommended as the initial diagnostic test for TB in children with presumed TB and can also be used on stool samples. Point-of-care urinary lipoarabinomannan assays are promising as 'rule-in' tests for children with presumed TB living with HIV. Treatment decision algorithms can be used to diagnose TB in symptomatic children in settings with and without access to chest X-rays; bacteriological confirmation should always be attempted. SUMMARY: Recent guideline updates are a key milestone in the management of childhood TB, and the paediatric TB community should now prioritize their efficient implementation in high TB burden countries while generating evidence to close current evidence gaps.


Assuntos
COVID-19 , Tuberculose , Criança , Humanos , Pandemias , COVID-19/diagnóstico , COVID-19/epidemiologia , Tuberculose/diagnóstico , Tuberculose/tratamento farmacológico , Tuberculose/epidemiologia
8.
Am J Emerg Med ; 67: 1-4, 2023 05.
Artigo em Inglês | MEDLINE | ID: mdl-36758267

RESUMO

BACKGROUND: Violence directed at healthcare workers (HCWs) is common and may be more frequent in the emergency department (ED). In addition to physical injury, other consequences of workplace violence in the ED include an increased risk of burnout, post-traumatic stress disorder, reduced job satisfaction, and feelings of avoidance and futility. Understanding behaviors underlying workplace violence is the first step to employing mitigation strategies. The objective of this descriptive study was to assess the prevalence and types of violence against HCWs in a large, urban ED. METHODS: This study took place in the ED of an urban hospital with an annual ED census of approximately 100,000. A previously existing general patient safety incident "dropbox" for HCWs was utilized to capture workplace violence reports. At the completion of the study period, all data was collated into the electronic database and each report was categorized based on the nature and severity of the abuse. Further, all events were also coded as either involving or not involving specifically racist, sexist, or homophobic content. The primary outcomes were the number of reported events over the study period, and the percentage of total events that fell into each category. The secondary outcomes were the overall prevalence and ratio of events that included racist, sexist, or homophobic language or provocation. RESULTS: Over the 5-month survey period, 130 reports of workplace violence were recorded, on average 0.85 per day. Perpetrators were mostly male, and most victims were nurses. Hospital security was involved in 26% of cases. At least 37% of incidents involved patients that were intoxicated and/or had history of psychiatric illness. Type I events (swearing provocatively, shouting, and legal threats) were the most common at 44% of encounters while 22% involved physical violence. Racist, sexist, and homophobic comments were involved in 8 (6%), 18 (14%), and 3 (2%) incidents respectively. CONCLUSION: We found that workplace violence against HCWs was common in this study, and sometimes involved a component of racist, sexist, or homophobic bias. Consistent with previous ED literature, we found that abusive events occurred almost daily and that approximately 20% of events involved physical violence. Future efforts toward policy change to address workplace violence in health care is needed at local, state, and national levels.


Assuntos
Violência no Trabalho , Humanos , Masculino , Feminino , Abuso Físico , Local de Trabalho/psicologia , Hospitais Urbanos , Serviço Hospitalar de Emergência , Inquéritos e Questionários
9.
BMC Pulm Med ; 23(1): 97, 2023 Mar 22.
Artigo em Inglês | MEDLINE | ID: mdl-36949477

RESUMO

BACKGROUND: Despite a high paediatric tuberculosis (TB) burden globally, sensitive and specific diagnostic tools are lacking. In addition, no data exist on the impact of pulmonary TB on long-term child lung health in low- and middle-income countries. The prospective observational UMOYA study aims (1) to build a state-of-the-art clinical, radiological, and biological repository of well-characterised children with presumptive pulmonary TB as a platform for future studies to explore new emerging diagnostic tools and biomarkers for early diagnosis and treatment response; and (2) to investigate the short and long-term impact of pulmonary TB on lung health and quality of life in children. METHODS: We will recruit up to 600 children (0-13 years) with presumptive pulmonary TB and 100 healthy controls. Recruitment started in November 2017 and is expected to continue until May 2023. Sputum and non-sputum-based samples are collected at enrolment and during follow-up in TB cases and symptomatic controls. TB treatment is started by routine care services. Intensive follow-up for 6 months will allow for TB cases to retrospectively be classified according to international consensus clinical case definitions for TB. Long-term follow-up, including imaging, comprehensive assessment of lung function and quality of life questionnaires, are done yearly up to 4 years after recruitment. DISCUSSION: The UMOYA study will provide a unique platform to evaluate new emerging diagnostic tools and biomarkers for early diagnosis and treatment response and to investigate long-term outcomes of pulmonary TB and other respiratory events on lung health in children.


Assuntos
Mycobacterium tuberculosis , Tuberculose Pulmonar , Tuberculose , Criança , Humanos , Estudos Prospectivos , Estudos Longitudinais , África do Sul , Qualidade de Vida , Estudos Retrospectivos , Tuberculose Pulmonar/diagnóstico , Tuberculose Pulmonar/tratamento farmacológico , Pulmão/diagnóstico por imagem , Estudos Observacionais como Assunto
10.
Clin Infect Dis ; 75(6): 1014-1021, 2022 09 29.
Artigo em Inglês | MEDLINE | ID: mdl-35015857

RESUMO

INTRODUCTION: The chest radiograph (CR) remains a key tool in the diagnosis of pediatric tuberculosis (TB). In children with presumptive intrathoracic TB, we aimed to identify CR features that had high specificity for, and were strongly associated with, bacteriologically confirmed TB. METHODS: We analyzed CR data from children with presumptive intrathoracic TB prospectively enrolled in a cohort study in a high-TB burden setting and who were classified using standard clinical case definitions as "confirmed," "unconfirmed," or "unlikely" TB. We report the CR features and inter-reader agreement between expert readers who interpreted the CRs. We calculated the sensitivity and specificity of the CR features with at least moderate inter-reader agreement and analyzed the relationship between these CR features and the classification of TB in a multivariable regression model. RESULTS: Of features with at least moderate inter-reader agreement, enlargement of perihilar and/or paratracheal lymph nodes, bronchial deviation/compression, cavities, expansile pneumonia, and pleural effusion had a specificity of > 90% for confirmed TB, compared with unlikely TB. Enlargement of perihilar (adjusted odds ratio [aOR]: 6.6; 95% confidence interval [CI], 3.80-11.72) and/or paratracheal lymph nodes (aOR: 5.14; 95% CI, 2.25-12.58), bronchial deviation/compression (aOR: 6.22; 95% CI, 2.70-15.69), pleural effusion (aOR: 2.27; 95% CI, 1.04-4.78), and cavities (aOR: 7.45; 95% CI, 3.38-17.45) were associated with confirmed TB in the multivariate regression model, whereas alveolar opacification (aOR: 1.16; 95% CI, .76-1.77) and expansile pneumonia (aOR: 4.16; 95% CI, .93-22.34) were not. CONCLUSIONS: In children investigated for intrathoracic TB enlargement of perihilar or paratracheal lymph nodes, bronchial compression/deviation, pleural effusion, or cavities on CR strongly support the diagnosis.


Assuntos
Derrame Pleural , Tuberculose Pulmonar , Tuberculose , Criança , Estudos de Coortes , Humanos , Radiografia , Tuberculose Pulmonar/diagnóstico por imagem
11.
Clin Infect Dis ; 74(10): 1767-1775, 2022 05 30.
Artigo em Inglês | MEDLINE | ID: mdl-34420049

RESUMO

BACKGROUND: Dispersible pediatric fixed-dose combination (FDC) tablets delivering higher doses of first-line antituberculosis drugs in World Health Organization-recommended weight bands were introduced in 2015. We report the first pharmacokinetic data for these FDC tablets in Zambian and South African children in the treatment-shortening SHINE trial. METHODS: Children weighing 4.0-7.9, 8.0-11.9, 12.0-15.9, or 16.0-24.9 kg received 1, 2, 3, or 4 tablets daily, respectively (rifampicin/isoniazid/pyrazinamide [75/50/150 mg], with or without 100 mg ethambutol, or rifampicin/isoniazid [75/50 mg]). Children 25.0-36.9 kg received doses recommended for adults <37 kg (300, 150, 800, and 550 mg/d, respectively, for rifampicin, isoniazid, pyrazinamide, and ethambutol). Pharmacokinetics were evaluated after at least 2 weeks of treatment. RESULTS: In the 77 children evaluated, the median age (interquartile range) was 3.7 (1.4-6.6) years; 40 (52%) were male and 20 (26%) were human immunodeficiency virus positive. The median area under the concentration-time curve from 0 to 24 hours for rifampicin, isoniazid, pyrazinamide, and ethambutol was 32.5 (interquartile range, 20.1-45.1), 16.7 (9.2-25.9), 317 (263-399), and 9.5 (7.5-11.5) mg⋅h/L, respectively, and lower in children than in adults for rifampicin in the 4.0-7.9-, 8-11.9-, and ≥25-kg weight bands, isoniazid in the 4.0-7.9-kg and ≥25-kg weight bands, and ethambutol in all 5 weight bands. Pyrazinamide exposures were similar to those in adults. CONCLUSIONS: Recommended weight band-based FDC doses result in lower drug exposures in children in lower weight bands and in those ≥25 kg (receiving adult doses). Further adjustments to current doses are needed to match current target exposures in adults. The use of ethambutol at the current World Health Organization-recommended doses requires further evaluation.


Assuntos
Pirazinamida , Tuberculose , Adulto , Antituberculosos/uso terapêutico , Criança , Pré-Escolar , Etambutol/uso terapêutico , Feminino , Humanos , Isoniazida/farmacocinética , Isoniazida/uso terapêutico , Masculino , Pirazinamida/farmacocinética , Rifampina/uso terapêutico , Tuberculose/tratamento farmacológico , Organização Mundial da Saúde
12.
Am J Perinatol ; 2022 Dec 30.
Artigo em Inglês | MEDLINE | ID: mdl-36351444

RESUMO

OBJECTIVE: Little is known about why neonatology fellows pick the fellowship program they do. Understanding why fellows choose neonatology and rank their programs would be of benefit to program leadership and to other applicants. STUDY DESIGN: This was a survey study sent to current neonatology fellows in the United States between September 2020 and October 2020, and were asked to rank their choices on a Likert scale. Respondents were also able to give free text responses to open-ended questions. RESULTS: The most important factor fellows state for choosing their program was location, with multiple reasons given. There were significant differences in how certain subgroups ranked programs. CONCLUSION: Location of the fellowship program is the most important factor for fellows. There are differences within subgroups of fellows on how they rank their fellowship program. Fellowship directors can use this information to better inform selections on who to interview and how to rank fellows. KEY POINTS: · Patient population appears to be the most important reason why fellows choose neonatology.. · Program location is the most important reason why fellows choose their specific training program.. · Fellowships can continue to highlight fellow camaraderie, scholarship, and clinical opportunities..

13.
Clin Infect Dis ; 73(4): e904-e912, 2021 08 16.
Artigo em Inglês | MEDLINE | ID: mdl-33449999

RESUMO

BACKGROUND: Limitations in the sensitivity and accessibility of diagnostic tools for childhood tuberculosis contribute to the substantial gap between estimated cases and cases notified to national tuberculosis programs. Thus, tools to make accurate and rapid clinical diagnoses are necessary to initiate antituberculosis treatment in more children. METHODS: We analyzed data from a prospective cohort of children <13 years old being routinely evaluated for pulmonary tuberculosis in Cape Town, South Africa, from March 2012 to November 2017. We developed a regression model to describe the contributions of baseline clinical evaluation to the diagnosis of tuberculosis using standardized, retrospective case definitions. We included baseline chest radiographic and Xpert MTB/RIF assay results to the model to develop an algorithm with ≥90% sensitivity in predicting tuberculosis. RESULTS: Data from 478 children being evaluated for pulmonary tuberculosis were analyzed (median age, 16.2 months; interquartile range, 9.8-30.9 months); 242 (50.6%) were retrospectively classified with tuberculosis, bacteriologically confirmed in 104 (43.0%). The area under the receiver operating characteristic curve for the final model was 0.87. Clinical evidence identified 71.4% of all tuberculosis cases in this cohort, and inclusion of baseline chest radiographic results increased the proportion to 89.3%. The algorithm was 90.1% sensitive and 52.1% specific, and maintained a sensitivity of >90% among children <2 years old or with low weight for age. CONCLUSIONS: Clinical evidence alone was sufficient to make most clinical antituberculosis treatment decisions. The use of evidence-based algorithms may improve decentralized, rapid treatment initiation, reducing the global burden of childhood mortality.


Assuntos
Mycobacterium tuberculosis , Tuberculose Pulmonar , Adolescente , Algoritmos , Criança , Pré-Escolar , HIV , Humanos , Lactente , Estudos Prospectivos , Estudos Retrospectivos , Sensibilidade e Especificidade , África do Sul/epidemiologia , Escarro , Tuberculose Pulmonar/diagnóstico , Tuberculose Pulmonar/tratamento farmacológico , Tuberculose Pulmonar/epidemiologia
14.
Histochem Cell Biol ; 155(5): 529-545, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33404706

RESUMO

Cholesterol has long been suspected of influencing hair biology, with dysregulated homeostasis implicated in several disorders of hair growth and cycling. Cholesterol transport proteins play a vital role in the control of cellular cholesterol levels and compartmentalisation. This research aimed to determine the cellular localisation, transport capability and regulatory control of cholesterol transport proteins across the hair cycle. Immunofluorescence microscopy in human hair follicle sections revealed differential expression of ATP-binding cassette (ABC) transporters across the hair cycle. Cholesterol transporter expression (ABCA1, ABCG1, ABCA5 and SCARB1) reduced as hair follicles transitioned from growth to regression. Staining for free cholesterol (filipin) revealed prominent cholesterol striations within the basement membrane of the hair bulb. Liver X receptor agonism demonstrated active regulation of ABCA1 and ABCG1, but not ABCA5 or SCARB1 in human hair follicles and primary keratinocytes. These results demonstrate the capacity of human hair follicles for cholesterol transport and trafficking. Future studies examining the role of cholesterol transport across the hair cycle may shed light on the role of lipid homeostasis in human hair disorders.


Assuntos
Transportador 1 de Cassete de Ligação de ATP/metabolismo , Membro 1 da Subfamília G de Transportadores de Cassetes de Ligação de ATP/metabolismo , Transportadores de Cassetes de Ligação de ATP/metabolismo , Colesterol/metabolismo , Folículo Piloso/metabolismo , Receptores Depuradores Classe B/metabolismo , Transportador 1 de Cassete de Ligação de ATP/análise , Transportador 1 de Cassete de Ligação de ATP/genética , Membro 1 da Subfamília G de Transportadores de Cassetes de Ligação de ATP/análise , Membro 1 da Subfamília G de Transportadores de Cassetes de Ligação de ATP/genética , Transportadores de Cassetes de Ligação de ATP/análise , Transportadores de Cassetes de Ligação de ATP/genética , Transporte Biológico , Células Cultivadas , Folículo Piloso/química , Folículo Piloso/crescimento & desenvolvimento , Humanos , Microscopia de Fluorescência , Receptores Depuradores Classe B/análise , Receptores Depuradores Classe B/genética
16.
Exp Dermatol ; 29(3): 299-311, 2020 03.
Artigo em Inglês | MEDLINE | ID: mdl-31260136

RESUMO

Lipids and lipid metabolism are critical factors in hair follicle (HF) biology, and cholesterol has long been suspected of influencing hair growth. Altered cholesterol homeostasis is involved in the pathogenesis of primary cicatricial alopecia, mutations in a cholesterol transporter are associated with congenital hypertrichosis, and dyslipidaemia has been linked to androgenic alopecia. The underlying molecular mechanisms by which cholesterol influences pathways involved in proliferation and differentiation within HF cell populations remain largely unknown. As such, expanding our knowledge of the role for cholesterol in regulating these processes is likely to provide new leads in the development of treatments for disorders of hair growth and cycling. This review describes the current state of knowledge with respect to cholesterol homeostasis in the HF along with known and putative links to hair pathologies.


Assuntos
Colesterol/metabolismo , Doenças do Cabelo/fisiopatologia , Folículo Piloso/fisiologia , Alopecia/metabolismo , Animais , Diferenciação Celular , Proliferação de Células , Colecalciferol/metabolismo , Cicatriz/patologia , Cabelo , Homeostase , Humanos , Inibidores de Hidroximetilglutaril-CoA Redutases/metabolismo , Hipertricose/congênito , Hipertricose/imunologia , Ictiose/metabolismo , Queratinócitos/citologia , Queratinócitos/metabolismo , Metabolismo dos Lipídeos , Lipídeos/química , Camundongos , Mutação , Receptores Ativados por Proliferador de Peroxissomo/metabolismo , Fenótipo , Transdução de Sinais , Fenômenos Fisiológicos da Pele , Esteroides/metabolismo , Esteróis/metabolismo
17.
J Clin Microbiol ; 56(9)2018 09.
Artigo em Inglês | MEDLINE | ID: mdl-29997199

RESUMO

The microbiological diagnosis of tuberculosis (TB) in children is challenging, as it relies on the collection of relatively invasive specimens by trained health care workers, which is not feasible in many settings. Mycobacterium tuberculosis is detectable from the stools of children using molecular methods, but processing stool specimens is resource intensive. We evaluated a novel, simple, centrifugation-free processing method for stool specimens for use on the Xpert MTB/RIF assay (Xpert), using two different stool masses: 0.6 g and a swab sample. Two hundred eighty children (median age, 15.5 months; 35 [12.5%] HIV infected) with suspected intrathoracic TB were enrolled from two sites in South Africa. Compared to a single Xpert test on respiratory specimens, the sensitivity of Xpert on stools using the 0.6-g and swab samples was 44.4% (95% confidence interval [CI], 13.7 to 78.8%) for both methods, with a specificity of >99%. The combined sensitivities of two stool tests versus the first respiratory Xpert were 70.0% (95% CI, 34.8 to 93.3) and 50.0% (95% CI, 18.7 to 81.3) for the 0.6-g and swab sample, respectively. Retesting stool specimens with nondeterminate Xpert results improved nondeterminate rates from 9.3% to 3.9% and from 8.6% to 4.3% for 0.6-g and swab samples, respectively. Overall, stool Xpert detected 14/94 (14.9%) children who initiated antituberculosis treatment, while respiratory specimens detected 23/94 (24.5%). This stool processing method is well suited for settings with low capacity for respiratory specimen collection. However, the overall sensitivity to detect confirmed and clinical TB was lower than that of respiratory specimens. More sensitive rapid molecular assays are needed to improve the utility of stools for the diagnosis of intrathoracic TB in children from resource-limited settings.


Assuntos
Fezes/microbiologia , Técnicas de Diagnóstico Molecular/métodos , Mycobacterium tuberculosis/genética , Tuberculose/diagnóstico , Tuberculose/microbiologia , Pré-Escolar , Feminino , Infecções por HIV/complicações , Humanos , Lactente , Masculino , Mycobacterium tuberculosis/isolamento & purificação , Nasofaringe/microbiologia , Sensibilidade e Especificidade , África do Sul , Manejo de Espécimes , Tuberculose Pulmonar/diagnóstico
18.
J Clin Microbiol ; 55(12): 3355-3365, 2017 12.
Artigo em Inglês | MEDLINE | ID: mdl-28904186

RESUMO

Bacteriological confirmation of Mycobacterium tuberculosis is achieved in the minority of young children with tuberculosis (TB), since specimen collection is resource intensive and respiratory secretions are mostly paucibacillary, leading to limited sensitivity of available diagnostic tests. Although molecular tests are increasingly available globally, mycobacterial culture remains the gold standard for diagnosis and determination of drug susceptibility and is more sensitive than molecular methods for paucibacillary TB. We evaluated stool culture as an alternative to respiratory specimens for the diagnosis of suspected intrathoracic TB in a subgroup of 188 children (median age, 14.4 months; 15.4% HIV infected) enrolled in a TB diagnostic study at two local hospitals in Cape Town, South Africa. One stool culture was compared to overall bacteriological confirmation by stool Xpert and by Xpert and culture of multiple respiratory specimens. After decontamination/digestion with NALC (N-acetyl-l-cysteine)-NaOH (1.25%), concentrated fluorescent smear microscopy, Xpert MTB/RIF, and liquid culture were completed for all specimens. Culture contamination of stool specimens was high at 41.5%. Seven of 90 (7.8%) children initiating TB treatment were stool culture positive for M. tuberculosis Excluding contaminated cultures, the sensitivity of stool culture versus confirmed TB was 6/25 (24.0%; 95% confidence interval [CI] = 9.4 to 45.1%). In addition, stool culture detected TB in 1/93 (1.1%) children with "unconfirmed TB." Testing the same stool by Xpert increased sensitivity to 33.3% (95% CI = 18.0 to 51.8%). In conclusion, stool culture had low sensitivity for M. tuberculosis detection in children with intrathoracic TB. Reducing culture contamination through improved laboratory protocols may enable more reliable estimates of its diagnostic utility.


Assuntos
Técnicas Bacteriológicas/métodos , Testes Diagnósticos de Rotina/métodos , Fezes/microbiologia , Mycobacterium tuberculosis/isolamento & purificação , Tuberculose Pulmonar/diagnóstico , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Masculino , Sensibilidade e Especificidade , África do Sul
19.
Acad Emerg Med ; 2024 Oct 21.
Artigo em Inglês | MEDLINE | ID: mdl-39434515

RESUMO

BACKGROUND: Diversity, equity, and inclusion (DEI) in health care fosters many positive outcomes including improved patient care. DEI initiatives are often created by or require buy-in from departmental leaders with low DEI literacy. Book clubs are one way to develop DEI literacy. The purpose of this paper is to describe how leaders in the department of emergency medicine (DEM) process the information gained from reading a DEI book through discussion in a book club setting and explore how participation enhances their DEI literacy and fosters self-reflection. METHODS: This was a qualitative exploratory study based on a constructivist approach. Data were analyzed by four researchers using inductive thematic analysis techniques. RESULTS: Sixty-eight leaders within the DEM participated in 11 book clubs. Nine themes were identified (examination of privilege, initial reaction to discussion about racism, discomfort, worry, self-reflection, release, role recognition, readiness, and education). After prompted examination of their own privilege participants moved through a model of perceived readiness to act. Participants started with feeling paralyzed by the work's enormity or becoming defensive. They then moved toward discomfort with discussions of racism and systemic racism and progressed to discussions around worrying that they were contributing to noninclusive environments. After a period of self-reflection, participants tended to release their paralysis, push aside their defensiveness, accept the role of discomfort, and express the importance of education on these issues. Participants then recognized their role in creating inclusive environments and started discussing what they can do about it, which, for many, was to show up to the conversation. An underlying driver of movement through this model was the education that was provided through the book. CONCLUSIONS: By addressing privilege and systemic inequities through the reflective practice and dialogue of a book club, participants demonstrated a growing commitment and perceived readiness to advancing inclusive practices within medicine.

20.
Trauma Violence Abuse ; 25(1): 41-53, 2024 01.
Artigo em Inglês | MEDLINE | ID: mdl-36458866

RESUMO

Approximately 50% of both men and women will experience emotional intimate partner violence (IPV) in their lifetime-a form of violence highly associated with other forms of IPV-making it important to develop further understanding of for assessment and treatment purposes. The bio-psycho-social model was used to guide the study. Utilizing data from 181 studies, yielding 348 effect sizes, we conducted a meta-analysis examining mental and physical health correlates with emotional IPV perpetration and victimization. We also examined if mental and physical health correlates were significantly stronger for emotional IPV perpetration or victimization, as well as if correlates were stronger for men or women. Suicidal ideation, post-traumatic stress, anxiety, depressive symptoms, borderline personality disorder (PD), psychological distress, physical pain, trauma, anger, shame, poor physical health, antisocial PD, and somatic symptoms were significantly associated with emotional IPV victimization. Borderline PD, narcissism, emotional dysregulation, anger, post-traumatic stress, antisocial PD, psychopathy, depressive symptoms, anxiety symptoms, and trauma were significantly associated with emotional IPV perpetration. Anger, emotional dysregulation, and psychopathology were stronger correlates for emotional IPV perpetration compared to victimization, and post-traumatic stress disorder (PTSD) and psychological distress were stronger correlates for victimization. PTSD and suicidal ideation were stronger correlates of IPV victimization for women than men, and anger was a significantly stronger correlate of IPV perpetration for women than men. This study highlights the importance of a holistic approach when working with victims and perpetrators of IPV, focusing on the importance of taking all aspects of the bio-psycho-social model into account.


Assuntos
Bullying , Vítimas de Crime , Violência por Parceiro Íntimo , Masculino , Humanos , Feminino , Fatores de Risco , Violência por Parceiro Íntimo/psicologia , Vítimas de Crime/psicologia , Violência
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