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2.
J Law Med Ethics ; 51(3): 473-479, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-38088609

RESUMO

The Supreme Court decided Box v. Planned Parenthood of Indiana and Kentucky in 2019. Justice Clarence Thomas's opinion in the case claimed there was a direct connection between the legalization of abortion, in the late 20th Century, and the beginnings of the birth control movement a full three quarters of a century earlier. "Many eugenicists," Thomas argued, "supported legalizing abortion."Justice Samuel Alito highlighted similar claims in Dobbs v. Jackson Women's Health, citing a brief entitled "The Eugenic Era Lives on through the Abortion Movement." That brief was an echo of Justice Thomas' misguided attempt at history in the Box opinion. Similar claims reoccur in Judge Matthew Kacsmaryk's opinion in the Texas mifepristone case, Alliance for Hippocratic Medicine v. U.S. Food and Drug Administration.These false claims are the focus of this article. There is no evidence that early leaders of the eugenics movement supported abortion as part of the movement for birth control. It is accurate to describe those leaders as anti-abortion, and their followers as people who condemned abortion for moral, legal, and medical reasons.


Assuntos
Aborto Induzido , Eugenia (Ciência) , Gravidez , Estados Unidos , Feminino , Humanos , Saúde da Mulher , Anticoncepção , Justiça Social , Decisões da Suprema Corte
3.
Ultrasound ; 31(3): 186-194, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37538968

RESUMO

Introduction: A lack of patient safety research hampers capacity to improve safety in healthcare.Ultrasound is often considered 'safe' as it does not use ionising radiation, a simplistic view of patient safety. Understanding sonographers' actions towards patient safety is crucial; however, self-reported measures cannot always predict behaviour. This study is part of a PhD exploring patient safety in medical diagnostic ultrasound. The aim of this paper is to explore sonographers' responses to the patient safety concerns identified in Part one of this study. The ultimate aim of the study is to inform the final phase of the doctoral study which will consider the next steps in improving the quality and safety of healthcare experienced by patients. Methods: A qualitative study using semi-structured, one-on-one interviews. The Theory of Planned Behaviour (TPB) explained how sonographers respond to perceived patient safety risks in practice. Results: Thirty-one sonographers were interviewed. Based on the seven themes identified in Part one of the study, results showed that incongruences exist between identifying patient safety risks and the actions taken in practice to manage these risks. Conclusion: The TPB showed that behavioural, normative and control beliefs impact sonographers' responses to perceived patient safety risks in practice and can lead to risk avoidance. Lack of regulation in ultrasound creates a challenge in dealing with Fitness to Practice issues. Collective actions are required to support sonographers in taking appropriate actions to enhance patient safety from multiple stakeholders including accreditation bodies, regulatory authorities, educational institutions and employers.

4.
J Law Med Ethics ; 51(1): 123-130, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37226752

RESUMO

During the 20th Century, thirty-two state legislatures passed laws that sanctioned coercive sexual sterilization as a solution to the purported detrimental increases in the population of "unfit" or "defective" citizens. While both scholarly and popular commentary has attempted to attribute these laws to political parties, or to broad or poorly defined ideological groups such as "progressives," no one has identified the political allegiance of each legislator who introduced a successfully adopted sterilization law, and the governor who signed it. This article remedies that omission.


Assuntos
Médicos , Humanos , Coerção , Órgãos Governamentais , Esterilização
5.
Ultrasound ; 31(2): 127-138, 2023 May.
Artigo em Inglês | MEDLINE | ID: mdl-37144224

RESUMO

Introduction: Patient safety has been an undervalued component of quality healthcare but is a challenging area of research.Ultrasound is the most common imaging modality in the world. Research on patient safety in ultrasound is generally focused on bioeffects and safe operation of ultrasound equipment. However, other safety issues exist in practice that warrant consideration.This paper forms the first part of a PhD study exploring patient safety in medical diagnostic ultrasound, beyond the notion of bioeffects.The ultimate aim of the study is to inform the final phase of the research study which will consider the next steps in improving the quality and safety of healthcare experienced by patients. Methods: A qualitative study using semi-structured, one-on-one interviews. A thematic analysis categorised data into codes and generated final themes. Results: A heterogeneous mix of 31 sonographers, who reflected the profile of the profession in Australia, were interviewed between September 2019 and January 2020. Seven themes emerged from the analysis. These were bioeffects, physical safety, workload, reporting, professionalism, intimate examinations and infection control. Conclusion: This study presents a comprehensive analysis of sonographers' perceptions of patient safety in ultrasound imaging, not previously available in the literature. Consistent with the literature, patient safety in ultrasound tends to be viewed in technical terms through the potential for bioeffects of tissue damage or physical harm to the patient. However, other patient safety issues have emerged, and while not as well recognised, have the potential to negatively impact on patient safety.

6.
J Pediatr Urol ; 19(4): 428.e1-428.e6, 2023 08.
Artigo em Inglês | MEDLINE | ID: mdl-37120366

RESUMO

INTRODUCTION: The medullary pyramid compresses during the early phases of severe hydronephrosis and represents a promising ultrasound metric for the diagnosis and surveillance of PUJ obstruction. The aim of this study was to define the optimal cut-off value and utility of medullary pyramid thickness (MPT) associated with the need for pyeloplasty in infants being followed up for hydronephrosis. METHODS: A retrospective review was performed over a five-year period to identify patients that were under surveillance for hydronephrosis during infancy and underwent a MAG3 to monitor the possible need for pyeloplasty. Ultrasound images were retrospectively reviewed to measure the MPT of the affected kidney in a blinded fashion. The primary outcome measure was subsequent requirement for pyeloplasty before three years of age. The Mann-Whitney U Test was used to determine statistically significant differences in the minimum MPT between the infant group requiring pyeloplasty and the non-operative group. Receiver operating characteristic analysis was performed to determine the optimal cut-off value associated with the requirement for pyeloplasty. RESULTS: A total of 63 patient cases were included, of which 45 underwent pyeloplasty (70%). A significant difference was found in the median MPT measurement between the pyeloplasty and non-operative groups (1.7 mm vs. 3.8 mm, p < 0.001). The optimal cut-off value of MPT associated with pyeloplasty was 3.4 mm. An MPT threshold of ≤3.4 mm conferred a sensitivity of 98%, specificity of 63%, positive predictive value of 86%, and negative predictive value of 92%. CONCLUSION: Thinning of the medullary pyramid is an important ultrasound sign of parenchymal deterioration in high-grade hydronephrosis. An optimal MPT cut-off value of ≤3.4 mm is associated with subsequent pyeloplasty in infants. MPT should be considered in future studies addressing the diagnosis and surveillance of PUJ obstruction.


Assuntos
Hidronefrose , Obstrução Ureteral , Lactente , Humanos , Pelve Renal/diagnóstico por imagem , Pelve Renal/cirurgia , Estudos Retrospectivos , Obstrução Ureteral/diagnóstico por imagem , Obstrução Ureteral/cirurgia , Obstrução Ureteral/complicações , Rim/cirurgia , Hidronefrose/diagnóstico por imagem , Hidronefrose/cirurgia , Hidronefrose/complicações , Resultado do Tratamento
7.
J Ultrasound Med ; 42(5): 1081-1091, 2023 May.
Artigo em Inglês | MEDLINE | ID: mdl-36321412

RESUMO

OBJECTIVES: Cranial ultrasound (cUS) screening is recommended for preterm neonates born before 32 weeks' gestational age (GA). The primary aim of this study was to determine if both a day 3 and day 8 cUS screening examination is necessary for all neonates. METHODS: A retrospective observational study was performed at a tertiary-level Australian hospital. Frequencies of cranial ultrasound abnormality (CUA) were compared between routine screening performed at postnatal days 3, 8, and 42. Univariate and multivariate analyses of risk factors for intraventricular hemorrhage (IVH) was performed using logistic regression. RESULTS: cUS examinations on 712 neonates born before 32 weeks' GA were included. Neonates were divided into 2 groups: 99 neonates in the 23-25 weeks 6 days GA (group A) and 613 neonates in the 26-31 weeks 6 days GA (group B). All CUA occurred more frequently in group A neonates and in the subset of group B neonates who had defined risk factors. Low-risk group B neonates had lower incidence of CUAs demonstrated on day 8 cUS than high-risk group B neonates, with no significant differences between day 3 and day 8. Logistic regression analysis identified a number of risk factors (vaginal delivery, small for GA, Apgar score <7 at 5 minutes, intubation, patent ductus arteriosus and infection) that were associated with increased frequency of IVH on day 8. In neonates born between 30 and 31 weeks 6 days GA, 35% had a CUA identified. CONCLUSIONS: Low-risk preterm neonates born between 26 and 31 weeks 6 days GA, without complications, could be screened with a single early cUS examination around day 8 without missing substantial abnormality.


Assuntos
Doenças do Prematuro , Recém-Nascido Prematuro , Feminino , Recém-Nascido , Humanos , Austrália , Idade Gestacional , Doenças do Prematuro/diagnóstico por imagem , Hemorragia Cerebral/diagnóstico por imagem , Estudos Retrospectivos , Estudos Observacionais como Assunto
8.
J Law Med Ethics ; 50(1): 124-138, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35243983

RESUMO

Dr. Caleb Williams Saleeby was the author of Parenthood and Race Culture, one of the first monographs on eugenics and the book that popularized the term "racial poison." The goal of eradicating the racial poisons and the harm they caused - particularly infant morbidity and mortality - provided common ground for early 20th century reformers, and their concerns fed the growing support for legal prohibition of alcohol.


Assuntos
Eugenia (Ciência) , Venenos , Eugenia (Ciência)/história , História do Século XX , Humanos
9.
Australas J Ultrasound Med ; 25(1): 28-35, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-35251900

RESUMO

OBJECTIVES: Several studies suggest solitary gallbladder polyps (GBPs) have an increased malignancy risk compared to multi-polyps. Furthermore, some malignant GBPs possessed faster growth rates compared to benign GBPs. To our knowledge, no study has established a relationship between GBP number and growth rates. Hence, this study aims to: (i) determine whether there is a statistical significance in growth rates between solitary GBPs versus multi-polyps; (ii) determine, in a four-year period, the proportion of GBPs in this study's total cohort that exhibit growth compared to previous studies. METHODS: A retrospective, quantitative, cohort study was implemented utilising 100 consecutive patient records from three private radiology clinics. These were assessed against the eligibility criteria and allocated into the solitary or multi-polyp study group, depending on number of GBPs detected on initial and follow-up ultrasound examinations conducted 6-48 months later. Patient age, GBP sizes, time interval between initial and follow-up ultrasound examinations and GBP growth rates were compared between the study groups utilising Student's t tests. RESULTS: No statistically significant difference was found between the study groups according to gender, age, GBP size and time between ultrasound examinations. Furthermore, there was no statistically significant difference between the growth rates of solitary and multi-polyp groups (P = 0.77). Most GBPs [92/100 (92%)] grew <2 mm in maximal diameter, while 8/100 (8%) of GBPs grew ≥2 mm in maximal diameter at follow-up. CONCLUSIONS: The large majority of GBPs maintained size stability at follow-up. On average, solitary GBPs did not grow faster than multi-polyps, although further research is recommended to reinforce this.

10.
Int J Qual Health Care ; 34(2)2022 Apr 12.
Artigo em Inglês | MEDLINE | ID: mdl-35311894

RESUMO

BACKGROUND: Professional competencies are important for enhancing alignment between the needs of education, industry and health consumers, whilst describing public expectations around health professionals. The development of competency standards for the sonography profession defines the behaviours, skills and knowledge sonographers should demonstrate for each learning and experience level. OBJECTIVE: The objective of this project was to develop a set of professional competency standards for the sonography profession which described in depth the behaviours, skills and knowledge sonographers should demonstrate across multiple learning and experience levels. METHODS: Representatives of three Australian ultrasound professional associations and seven tertiary institutions involved in entry-level sonographer education in Australia formed a research team (RT). The RT recruited an expert panel that responded to six survey rounds. Using a Delphi methodology, the results and free-text comments from each previous round were fed back to participants in the subsequent survey rounds to achieve a consensus. RESULTS: The project developed a professional competency framework for sonographers, which included four major domains: detailed competency standards, sonographer knowledge, sonographer attitudes and a holistic competency matrix [https://doi.org/10.6084/m9.figshare.17148035.v2.]. CONCLUSION: The Delphi methodology is an effective way to develop professional competency standards. This paper describes the methods and challenges in developing such standards for sonographers which could be translated to other health professionals.


Assuntos
Pessoal de Saúde , Competência Profissional , Austrália , Competência Clínica , Consenso , Técnica Delphi , Humanos
11.
Australas J Ultrasound Med ; 24(2): 82-88, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-34765415

RESUMO

PURPOSE: To determine patient understanding and expectations of ultrasound imaging and its safety, sources of examination information and levels of examination anxiety. METHODS: 1070 consecutive patients presenting to a private, regional radiology practice in New South Wales, Australia between 16th May and 14th June 2019, were invited to complete a survey while waiting for their non-interventional ultrasound examination. The survey included questions on demographic characteristics, knowledge such as examination risks and safety, ultrasound expectations such as dissemination of results, sources of examination information and levels of participant anxiety. Data were analysed using Kruskal-Wallis tests (SPSS v. 25) to determine statistical associations between participant demographic factors, knowledge, anxiety level and the main source of examination information. RESULTS: A total of 215/1070 (20%) patients voluntarily participated in the study. Most were female (74%, 159/215), with a median (range) age of 55 (18-92) years. Participant's median (range) score of ultrasound imaging knowledge was 3 (0-5) scored out of six and indicated uncertainty regarding the ultrasound procedure, result dissemination and ultrasound safety. Participants with previous personal experience had significantly higher levels of ultrasound imaging knowledge than those whose primary information source was their referring doctor (P = 0.0005) or the internet (P = 0.026). Significantly higher levels of ultrasound examination knowledge were also associated with lower self-reported levels of anxiety (P = 0.002). CONCLUSION: Participants had incomplete ultrasound examination knowledge, including misconceptions regarding safety and result dissemination, some of which could be clarified by the sonographer at the beginning of the ultrasound examination.

12.
Ultrasound Med Biol ; 47(7): 1645-1656, 2021 07.
Artigo em Inglês | MEDLINE | ID: mdl-33895036

RESUMO

Cranial ultrasound examinations are routinely performed in very preterm neonates. There is no widespread agreement on the optimal timing of these examinations. This review examines screening protocols and recommendations available for the timing of cranial ultrasound examinations in preterm neonates born before 32 wk of gestation. A systematic search was performed to find published screening protocols, and 18 articles were included in the final review. The protocols varied in their recommendations on timing, although at least one examination in the first week of life was universally recommended. The recommended timing for a "late" or final ultrasound examination was variable, and included at 6 wks of postnatal age, term-equivalent age or hospital discharge. There was no agreement as to whether weekly or fortnightly sequential ultrasound imaging should be performed after the first week of life. Further studies are required to establish an optimal protocol for these very preterm neonates to improve detection and monitoring of brain injuries.


Assuntos
Encefalopatias/diagnóstico por imagem , Ecoencefalografia , Protocolos Clínicos , Humanos , Recém-Nascido , Recém-Nascido Prematuro , Triagem Neonatal
14.
Exp Physiol ; 105(8): 1256-1267, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-32436635

RESUMO

NEW FINDINGS: What is the central question of this study? What is the immediate impact of moderate preterm birth on the structure and function of major conduit arteries using a pre-clinical sheep model? What is the main finding and its importance? Postnatal changes in conduit arteries, including a significant decrease in collagen within the thoracic aortic wall (predominately males), narrowed carotid arteries, reduced aortic systolic blood flow, and upregulation of the mRNA expression of cell adhesion and inflammatory markers at 2 days of age in preterm lambs compared to controls, may increase the risk of cardiovascular impairment in later life. ABSTRACT: The aim of this work was to compare the structure and function of the conduit arteries of moderately preterm and term-born lambs and to determine whether vascular injury-associated genes were upregulated. Time-mated ewes were induced to deliver either preterm (132 ± 1 days of gestation; n = 11 females and n = 10 males) or at term (147 ± 1 days of gestation; n = 10 females and n = 5 males). Two days after birth, ultrasound imaging of the proximal ascending aorta, main, right and left pulmonary arteries, and right and left common carotid arteries was conducted in anaesthetized lambs. Lambs were then killed and segments of the thoracic aorta and left common carotid artery were either snap frozen for real-time PCR analyses or immersion-fixed for histological quantification of collagen, smooth muscle and elastin within the medial layer. Overall there were few differences in vascular structure between moderately preterm and term lambs. However, there was a significant decrease in the proportion of collagen within the thoracic aortic wall (predominantly in males), narrowing of the common carotid arteries and a reduction in peak aortic systolic blood flow in preterm lambs. In addition, there was increased mRNA expression of the cell adhesion marker P-selectin in the thoracic aortic wall and the pro-inflammatory marker IL-1ß in the left common carotid artery in preterm lambs, suggestive of postnatal vascular injury. Early postnatal differences in the function and structure of conduit arteries and evidence of vascular injury in moderately preterm offspring may place them at greater risk of cardiovascular impairment later in life.


Assuntos
Artérias Carótidas/fisiopatologia , Nascimento Prematuro/fisiopatologia , Artéria Pulmonar/fisiopatologia , Animais , Animais Recém-Nascidos , Aorta/fisiopatologia , Aorta Torácica/fisiopatologia , Colágeno/metabolismo , Feminino , Expressão Gênica , Hemodinâmica , Masculino , Ovinos
15.
J Ultrasound Med ; 38(12): 3257-3266, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31140631

RESUMO

OBJECTIVES: The purpose of this study was to compare the diagnostic performance of the fat-to-lesion strain ratio (FLR) and gland-to-lesion strain ratio (GLR) for patients with indeterminate or suspicious breast lesions on ultrasound (US) imaging under a controlled precompression technique and to see whether the technique improves the reproducibility of FLR and GLR measurement. METHODS: Fifty-three lesions in 39 consecutive patients who had scheduled core biopsy or excision surgery based on US findings were examined by US elastography. Each lesion was acquired under controlled precompression by 2 sonographers independently. Both the FLR and GLR of the lesion were calculated. For diagnostic performance, the sensitivity, specificity, negative predictive value, positive predictive value, and accuracy were obtained. Interobserver reliability between different sonographers was assessed by the intraclass correlation coefficient (ICC). RESULTS: Forty lesions were benign, and 13 lesions were malignant. Both the FLR and GLR were significantly higher in malignant than benign lesions (P < .05). The FLR yielded higher accuracy and specificity compared to the GLR (accuracy, 79.2% versus 60.4%; and specificity, 87.5% versus 50.0%). With the controlled precompression applied at less than 25% during elastography, the interobserver agreement was excellent for FLR measurements (ICC, 0.853; 95% confidence interval, 0.738-0.920) and GLR measurements (ICC, 0.779; 95% confidence interval, 0.619-0.87). CONCLUSIONS: The FLR performed better than the GLR in the detection of breast malignancy; thus, fatty tissue was a better reference tissue for calculating the strain ratio on malignant breast tumor elastography. Keeping precompression to less than 25% will enable different operators to acquire similar elastograms with reproducible FLR and GLR readings.


Assuntos
Neoplasias da Mama/diagnóstico por imagem , Técnicas de Imagem por Elasticidade/métodos , Ultrassonografia Mamária/métodos , Tecido Adiposo/diagnóstico por imagem , Adulto , Idoso , Feminino , Humanos , Pessoa de Meia-Idade , Estudos Prospectivos
16.
Ethics Hum Res ; 41(2): 29-34, 2019 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-30895754

RESUMO

The U.S. Public Health Service's sexually transmitted disease (STD) experiments in Guatemala are an important case study not only in human subjects research transgressions but also in the response to serious lapses in research ethics. This case study describes how individuals in the STD experiments were tested, exposed to STDs, and exploited as the source of biological specimens-all without informed consent and often with active deceit. It also explores and evaluates governmental and professional responses that followed the public revelation of these experiments, including by academic institutions, professional organizations, and the U.S. federal government, pushing us to reconsider both how we prevent such lapses in the future and how we respond when they are first revealed.


Assuntos
Ética em Pesquisa/história , Experimentação Humana não Terapêutica/ética , Experimentação Humana não Terapêutica/história , Sujeitos da Pesquisa , Infecções Sexualmente Transmissíveis/induzido quimicamente , Infecções Sexualmente Transmissíveis/história , United States Public Health Service/ética , Adulto , Criança , Coerção , Enganação , Feminino , Guatemala , História do Século XX , Humanos , Consentimento Livre e Esclarecido/ética , Masculino , Manejo de Espécimes/ética , Manejo de Espécimes/história , Estados Unidos , Populações Vulneráveis/etnologia
17.
Hypertension ; 73(3): 718-727, 2019 03.
Artigo em Inglês | MEDLINE | ID: mdl-30661475

RESUMO

We examined whether renal denervation (RDN) reduced blood pressure (BP), improved glomerular filtration rate, albuminuria, and left ventricular mass in sheep with hypertensive chronic kidney disease (CKD). To examine whether renal nerve function returned in the long term, we examined vascular contraction to nerve stimulation in renal arteries and determined nerve regrowth by assessing renal TH (tyrosine hydroxylase), CGRP (calcitonin gene-related peptide), and norepinephrine levels in kidneys at 30 months after RDN. RDN normalized BP in hypertensive CKD sheep such that BP was similar to that of the normotensive sheep with intact nerves. Glomerular filtration rate decreased by ≈22% in CKD sheep with intact nerves but increased ≈26% in hypertensive CKD-RDN sheep by 30 months. At 30 months, urinary albumin was ≈127% and left ventricular mass was ≈41% greater in CKD sheep with intact nerves than control. However, urinary albumin was ≈60% less and left ventricular mass was ≈40% less in the CKD sheep that underwent RDN compared with intact counterpart. At 30 months in CKD-RDN sheep, neurovascular contraction (≈56%), renal proportion of TH (≈50%), CGRP (≈67%), and norepinephrine content (≈49%) were all less than CKD-intact; all these variables were similar between normotensive-intact and normotensive-RDN groups. RDN caused a sustained reduction in BP and improvements in renal function. Regrowth of renal nerves and return of function were observed in hypertensive CKD-RDN sheep, but levels were only partially restored to levels of intact. These suggest that RDN lowers BP in the long term and is renoprotective and cardioprotective as a result of lesser nerve regrowth in CKD.


Assuntos
Pressão Sanguínea/fisiologia , Ablação por Cateter/métodos , Hipertensão/fisiopatologia , Rim/inervação , Regeneração Nervosa , Insuficiência Renal Crônica/terapia , Simpatectomia/métodos , Animais , Modelos Animais de Doenças , Ecocardiografia , Feminino , Seguimentos , Taxa de Filtração Glomerular/fisiologia , Ventrículos do Coração/diagnóstico por imagem , Ventrículos do Coração/fisiopatologia , Hipertensão/etiologia , Hipertensão/terapia , Insuficiência Renal Crônica/complicações , Insuficiência Renal Crônica/fisiopatologia , Ovinos , Sistema Nervoso Simpático/fisiopatologia , Sistema Nervoso Simpático/cirurgia , Função Ventricular Esquerda/fisiologia
19.
Milbank Q ; 96(2): 244-271, 2018 06.
Artigo em Inglês | MEDLINE | ID: mdl-29652094

RESUMO

Policy Points: While most scholarship regarding the US Public Health Service's STD experiments in Guatemala during the 1940s has focused on the intentional exposure experiments, secondary research was also conducted on biospecimens collected from these subjects. These biospecimen experiments continued after the Guatemala grant ended, and the specimens were used in conjunction with those from the Tuskegee syphilis experiments for ongoing research. We argue there should be a public accounting of whether there are still biospecimens from the Guatemala and Tuskegee experiments held in US government biorepositories today. If such specimens exist, they should be retired from US government research archives because they were collected unethically as understood at the time. CONTEXT: The US Public Health Service's Guatemala STD experiments (1946-1948) included intentional exposure to pathogens and testing of postexposure prophylaxis methods for syphilis, gonorrhea, and chancroid in over 1,300 soldiers, commercial sex workers, prison inmates, and psychiatric patients. Though the experiments had officially ended, the biospecimens collected from these subjects continued to be used for research at least into the 1950s. METHODS: We analyzed historical documents-including clinical and laboratory records, correspondence, final reports, and medical records-for information relevant to these biospecimen experiments from the US National Archives. In addition, we researched material from past governmental investigations into the Guatemala STD experiments, including those of the US Presidential Commission for the Study of Bioethical Issues and the Guatemalan Comisión Presidencial para el Esclarecimiento de los Experimentos Practicados con Humanos en Guatemala. FINDINGS: Identified spinal fluid, blood specimens, and tissue collected during the Guatemala diagnostic methodology and intentional exposure experiments were subsequently distributed to laboratories throughout the United States for use in ongoing research until at least 1957. Five psychiatric patient subjects involved in these biospecimen experiments died soon after experimental exposure to STDs. The same US government researchers working with the Guatemala biospecimens after the exposure experiments ended were also working with specimens taken from the Tuskegee syphilis study. CONCLUSIONS: There should be a complete public accounting of whether biospecimens from the Guatemala and Tuskegee experiments are held in US government biorepositories today. If they still exist, these specimens should be retired from such biorepositories and their future disposition determined by stakeholders, including representatives from the communities from which they were derived.


Assuntos
Ética em Pesquisa/história , Experimentação Humana/ética , Experimentação Humana/história , Infecções Sexualmente Transmissíveis , Manejo de Espécimes/ética , Manejo de Espécimes/métodos , Adulto , Feminino , Guatemala , História do Século XX , História do Século XXI , Humanos , Masculino , Pessoa de Meia-Idade , Estados Unidos
20.
J Physiol ; 596(23): 5965-5975, 2018 12.
Artigo em Inglês | MEDLINE | ID: mdl-29508407

RESUMO

KEY POINTS: Preterm birth occurs when the heart muscle is immature and ill-prepared for the changes in heart and lung function at birth. MRI imaging studies show differences in the growth and function of the heart of young adults born preterm, with the effects more pronounced in the right ventricle. The findings of this study, conducted in sheep, showed that following moderate preterm birth the right ventricular wall was thinner in adulthood, with a reduction in the number and size of the heart muscle cells; in addition, there was impaired blood flow in the main artery leading from the right ventricle to the lungs. The findings indicate that being born only a few weeks early adversely affects the cellular structure of the right ventricle and blood flow to the lungs in adulthood. The reduced number of heart muscle cells has the potential to deleteriously affect right ventricular growth potential and function. ABSTRACT: Preterm birth prematurely exposes the immature heart to the haemodynamic transition at birth, which has the potential to induce abnormal cardiac remodelling. Magnetic resonance imaging studies in young adults born preterm have shown abnormalities in the gross structure of the ventricles (particularly the right ventricle; RV), but the cellular basis of these alterations is unknown. The aim of this study, conducted in sheep, was to determine the effect of moderate preterm birth on RV cellular structure and function in early adulthood. Male singleton lambs were delivered moderately preterm (132 ± 1 days; n = 7) or at term (147 ± 1 days; n = 7). At 14.5 months of age, intra-arterial blood pressure and heart rate were measured. Pulmonary artery diameter and peak systolic blood flow were determined using ultrasound imaging, and RV stroke volume and output calculated. Cardiomyocyte number, size, nuclearity and levels of cardiac fibrosis were subsequently assessed in perfusion-fixed hearts using image analysis and stereological methods. Blood pressure (systolic, diastolic and mean), heart rate, levels of myocardial fibrosis and RV stroke volume and output were not different between groups. There was, however, a significant reduction in RV wall thickness in preterm sheep, and this was accompanied by a significant reduction in peak systolic blood flow in the pulmonary artery and in RV cardiomyocyte number. Cellular changes in the RV wall and reduced pulmonary artery blood flow following preterm birth have the potential to adversely affect cardiac and respiratory haemodynamics, especially when the cardiovascular system is physiologically or pathologically challenged.


Assuntos
Artéria Pulmonar/fisiologia , Função Ventricular Direita , Animais , Animais Recém-Nascidos , Pressão Sanguínea , Feminino , Frequência Cardíaca , Ventrículos do Coração/anatomia & histologia , Ventrículos do Coração/fisiopatologia , Masculino , Gravidez , Ovinos
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