Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 227
Filtrar
4.
BMC Med Ethics ; 25(1): 72, 2024 Jun 20.
Artigo em Inglês | MEDLINE | ID: mdl-38902648

RESUMO

BACKGROUND: While the number of emergency patients worldwide continues to increase, emergency doctors often face moral distress. It hampers the overall efficiency of the emergency department, even leading to a reduction in human resources. AIM: This study explored the experience of moral distress among emergency department doctors and analyzed the causes of its occurrence and the strategies for addressing it. METHOD: Purposive and snowball sampling strategies were used in this study. Data were collected through in-depth, semi-structured interviews with 10 doctors working in the emergency department of a tertiary general hospital in southwest China. The interview data underwent processing using the Nvivo 14 software. The data analysis was guided by Colaizzi's phenomenological analysis method. STUDY FINDINGS: This study yielded five themes: (1) imbalance between Limited Medical Resources and High-Quality Treatment Needs; (2) Ineffective Communication with Patients; (3) Rescuing Patients With no prospect of treatment; (4) Challenges in Sustaining Optimal Treatment Measures; and (5) Strategies for Addressing Moral Distress. CONCLUSION: The moral distress faced by emergency doctors stems from various aspects. Clinical management and policymakers can alleviate this distress by enhancing the dissemination of emergency medical knowledge to the general public, improving the social and economic support systems, and strengthening multidisciplinary collaboration and doctors' communication skills.


Assuntos
Serviço Hospitalar de Emergência , Princípios Morais , Médicos , Pesquisa Qualitativa , Humanos , China , Médicos/psicologia , Médicos/ética , Feminino , Masculino , Adulto , Serviço Hospitalar de Emergência/ética , Atitude do Pessoal de Saúde , Estresse Psicológico/etiologia , Comunicação , Relações Médico-Paciente/ética , Pessoa de Meia-Idade , População do Leste Asiático
5.
J Emerg Med ; 67(1): e99-e104, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38797612

RESUMO

BACKGROUND: The changing hospital business model has raised ethical issues for emergency physicians (EPs) in a healthcare system that often prioritizes profits over patient welfare. For-profit hospitals, driven by profit motives, may prioritize treating patients with lucrative insurance plans and those who can afford expensive treatments. Private equity investors, who now own many for-profit hospitals, focus on short-term financial gains, leading to cost-cutting measures and pressure on EPs to prioritize financial goals over patient welfare. Nonprofit hospitals, mandated to provide charity care to the underserved, may fail to meet their community service obligations, resulting in disparities in healthcare access. OBJECTIVE: This review examines the ethical challenges faced by emergency physicians (EPs) in response to the evolving hospital business model, which increasingly prioritizes profits over patient welfare. DISCUSSION: Emergency physicians face ethical dilemmas in this changing environment, including conflicts between patient care and financial interests. Upholding professional ethics and the principle of beneficence is essential. Another challenge is equitable access to healthcare, with some nonprofit hospitals reducing charity care, thus exacerbating disparities. EPs must uphold the ethical principle of justice, ensuring quality care for all patients, regardless of financial means. Conflicts of interest may arise when EPs work in hospitals owned by private equity firms or with affiliations with pharmaceutical companies or medical device manufacturers, potentially compromising patient care. CONCLUSION: Emergency physicians must navigate these ethical issues while upholding professional ethics and advocating for patients' best interests. Collaboration with hospital administrators, policymakers, and stakeholders is vital to address these concerns and prioritize patient welfare in healthcare delivery.


Assuntos
Serviço Hospitalar de Emergência , Humanos , Serviço Hospitalar de Emergência/ética , Serviço Hospitalar de Emergência/organização & administração , Serviço Hospitalar de Emergência/economia , Medicina de Emergência/ética , Médicos/ética , Conflito de Interesses , Acessibilidade aos Serviços de Saúde/ética , Modelos Organizacionais
7.
Pediatrics ; 149(1)2022 01 01.
Artigo em Inglês | MEDLINE | ID: mdl-34972220

RESUMO

In this Ethics Rounds we present a conflict regarding discharge planning for a febrile infant in the emergency department. The physician believes discharge would be unsafe and would constitute a discharge against medical advice. The child's mother believes her son has been through an already extensive and painful evaluation and would prefer to monitor her well-appearing son closely at home with a safety plan and a next-day outpatient visit. Commentators assess this case from the perspective of best interest, harm-benefit, conflict management, and nondiscriminatory care principles and prioritize a high-quality informed consent process. They characterize the formalization of discharge against medical advice as problematic. Pediatricians, a pediatric resident, ethicists, an attorney, and mediator provide a range of perspectives to inform ethically justifiable options and conflict resolution practices.


Assuntos
Serviço Hospitalar de Emergência/ética , Alta do Paciente , Recusa de Participação/ética , Recusa do Paciente ao Tratamento/ética , Tomada de Decisão Compartilhada , Febre de Causa Desconhecida , Humanos , Lactente , Masculino , Urinálise , Infecções Urinárias/complicações , Infecções Urinárias/diagnóstico
8.
PLoS One ; 16(9): e0256513, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34473754

RESUMO

INTRODUCTION: Reducing aggressive tendencies among care receivers in the emergency department has great economic and psychological benefits for care receivers, staff, and health care organizations. In a study conducted in a large multicultural hospital emergency department, we examined how cultural factors relating to ethnicity interact to enhance care receivers' satisfaction and reduce their aggressive tendencies. Specifically, we explored how care receivers' cultural affiliation, individual cultural characteristics, and the cultural situational setting interact to increase care receivers' satisfaction and reduce their aggressive tendencies. METHOD: Data were collected using survey responses from 214 care receivers. We use structural equation models and the bootstrap method to analyze the data. RESULTS: Care receivers' openness to diversity (an individual cultural characteristic) was positively related to their satisfaction that was associated with lower aggressive tendencies, only when they were affiliated with a cultural minority group and when the cultural situational setting included language accessibility. CONCLUSION: Our results demonstrate that cultural affiliation, individual cultural characteristics, and cultural situational setting can affect care receivers' satisfaction and aggressive tendencies in a multicultural emergency department context. In particular, high cultural openness of care receivers, and making information accessible in their native language, increased satisfaction and reduced aggressive tendencies among cultural minority care receivers in our study.


Assuntos
Agressão/psicologia , Diversidade Cultural , Serviço Hospitalar de Emergência/ética , Relações Enfermeiro-Paciente/ética , Satisfação do Paciente/estatística & dados numéricos , Relações Médico-Paciente/ética , Árabes/psicologia , Humanos , Israel , Judeus/psicologia , Satisfação do Paciente/etnologia , Inquéritos e Questionários
9.
Ann Emerg Med ; 78(6): 738-748, 2021 12.
Artigo em Inglês | MEDLINE | ID: mdl-34332806

RESUMO

STUDY OBJECTIVE: We sought to examine how physicians understand the role of law enforcement in the emergency department (ED) and to identify how the presence of law enforcement officers may impact the delivery of emergency medical care. METHODS: In this qualitative study, we conducted semistructured interviews with 20 emergency physicians practicing in county EDs across 3 health care systems in Northern California between November 2017 and September 2018. Participants were recruited using snowball sampling and included 10 board-certified physicians and 10 resident physicians. We analyzed the interview content using grounded theory, where concepts from interview data were coded, grouped by theme, and compared over consecutive interviews to identify recurrent themes. RESULTS: Participants reported interacting frequently with law enforcement officers while treating patients. Most participants characterized their experiences with law enforcement as "mixed" or "variable." Positive interactions with officers, who were described as helpful and collegial, contrasted with instances in which respondents felt police presence led to interruptions in treatment, breaches in health privacy, and potentially diminished patient trust. Participants reported that, at times, the authority of officers in the ED felt unclear and ill-defined, leading to contentious interactions between officers and health care personnel. CONCLUSION: Lack of clear definition of the role of law enforcement officers in the ED may lead to contentious interactions with emergency physicians. Further research on the medical impacts of police presence in health care settings and on best practices for mitigating negative impacts is needed.


Assuntos
Tratamento de Emergência , Aplicação da Lei , Assistência ao Paciente , Médicos/psicologia , Polícia , Adulto , Idoso , Serviço Hospitalar de Emergência/ética , Humanos , Entrevistas como Assunto , Masculino , Pessoa de Meia-Idade , Relações Médico-Paciente , Pesquisa Qualitativa , Inquéritos e Questionários
10.
Emerg Med J ; 38(11): 851-854, 2021 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33687992

RESUMO

Millions of patients present to US EDs each year with symptoms concerning for acute coronary syndrome (ACS), but fewer than 10% are ultimately diagnosed with ACS. Well-tested and externally validated accelerated diagnostic protocols were developed to aid providers in risk stratifying patients with possible ACS and have become central components of current ED practice guidelines. Nevertheless, the fear of missing ACS continues to be a strong motivator for ED providers to pursue further testing for their patients. An ethical dilemma arises when the provider must balance the risk of ACS if the patient is discharged compared with the potential harms caused by a cardiac workup. Providers should be familiar with the ethical principles relevant to this dilemma in order to determine what is in the best interests of the patient.


Assuntos
Síndrome Coronariana Aguda/diagnóstico , Serviço Hospitalar de Emergência/ética , Síndrome Coronariana Aguda/complicações , Dor no Peito/etiologia , Dor no Peito/terapia , Eletrocardiografia/métodos , Serviço Hospitalar de Emergência/organização & administração , Humanos , Autonomia Pessoal , Fatores de Risco , Justiça Social
11.
Am J Emerg Med ; 39: 114-120, 2021 01.
Artigo em Inglês | MEDLINE | ID: mdl-32037122

RESUMO

BACKGROUND: Informed consent for procedures in the emergency department (ED) challenges practitioners to navigate complex ethical and medical ambiguities. A patient's altered mental status or emergent medical problem does not negate the importance of his or her participation in the decision-making process but, rather, necessitates a nuanced assessment of the situation to determine the appropriate level of participation. Given the complexities involved with informed consent for procedures in the ED, it is important to understand the experience of key stakeholders involved. METHODS: For this review, we searched Medline, the Cochrane database, and Clinicaltrials.gov for studies involving informed consent in the ED. Inclusion and exclusion criteria were designed to select for studies that included issues related to informed consent as primary outcomes. The following data was extracted from included studies: Title, authors, date of publication, study type, participant type (i.e. adult patient, pediatric patient, parent of pediatric patient, patient's family, or healthcare provider), number of participants, and primary outcomes measured. RESULTS: Fifteen articles were included for final review. Commonly addressed themes included medical education (7 of 15 studies), surrogate decision-making (5 of 15 studies), and patient understanding (4 of 15 studies). The least common theme addressed in the literature was community notification (1 of 15 studies). CONCLUSIONS: Studies of informed consent for procedures in the ED span many aspects of informed consent. The aim of the present narrative review is to summarize the work that has been done on informed consent for procedures in the ED.


Assuntos
Compreensão , Serviço Hospitalar de Emergência/ética , Consentimento Livre e Esclarecido/ética , Procedimentos Cirúrgicos Operatórios , Humanos , Ensaios Clínicos Controlados Aleatórios como Assunto
12.
Emerg Med Clin North Am ; 39(1): 217-225, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-33218659

RESUMO

The emergency department is where the patient and potential ethical challenges are first encountered. Patients with acute neurologic illness introduce a unique set of dilemmas related to the pressure for ultra-early prognosis in the wake of rapidly advancing treatments. Many with neurologic injury are unable to provide autonomous consent, further complicating the picture, potentially asking uncertain surrogates to make quick decisions that may result in significant disability. The emergency department physician must take these ethical quandaries into account to provide standard of care treatment.


Assuntos
Lesões Encefálicas Traumáticas/terapia , Assistência Terminal/ética , Manuseio das Vias Aéreas/ética , Manuseio das Vias Aéreas/métodos , Beneficência , Morte Encefálica/diagnóstico , Lesões Encefálicas Traumáticas/diagnóstico , Serviço Hospitalar de Emergência/ética , Procedimentos Endovasculares/ética , Ética Médica , Humanos , Consentimento Livre e Esclarecido/ética , Prognóstico , Acidente Vascular Cerebral/terapia , Obtenção de Tecidos e Órgãos/ética
13.
Gac Med Mex ; 156(5): 366-372, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33372921

RESUMO

INTRODUCTION: Mexico is the country with the highest mortality due to ST-elevation acute myocardial infarction (STEMI), and the IMSS has therefore developed the protocol of care for emergency departments called Código Infarto (Infarction Code). In this article, aspects of translational medicine are discussed with a bioethical and comprehensive perspective. OBJECTIVE: To analyze the Código Infarto protocol from the perspective of translational bioethics. METHOD: A problem-centered approach was carried out through reflective equilibrium (or Rawls' method), as well as by applying the integral method for ethical discernment. RESULTS: The protocol of care for emergency services Código Infarto is governed by evidence-based medicine and value-based medicine; it is guided by a principle of integrity that considers six dimensions of quality for the care of patients with STEMI. CONCLUSION: The protocol overcomes some adverse social determinants that affect STEMI medical care, reduces mortality and global economic disease burden, and develops medicine of excellence with high social reach.


INTRODUCCIÓN: México es el país con mayor mortalidad por infarto agudo de miocardio con elevación del segmento ST (IAM CEST), por lo que el Instituto Mexicano del Seguro Social desarrolló el protocolo de atención para los servicios de urgencias denominado Código Infarto. En este artículo se discuten aspectos de la medicina traslacional con una perspectiva bioética e integral. OBJETIVO: Analizar el protocolo Código Infarto desde la perspectiva de la bioética traslacional. MÉTODO: Se realizó una aproximación centrada en el problema a través del equilibrio reflexivo, así como la aplicación del método integral para el discernimiento ético. RESULTADOS: El protocolo de atención para los servicios de urgencias Código Infarto se rige por la medicina basada en la evidencia y la medicina basada en valores; se orienta por el principio de integridad que considera las seis dimensiones de la calidad para la atención de pacientes con IAM CEST. CONCLUSIÓN: El protocolo supera algunos determinantes sociales adversos que afectan la atención médica del IAM CEST, disminuye la mortalidad, la carga económica global de la enfermedad y desarrolla una medicina de excelencia de alto alcance social.


Assuntos
Temas Bioéticos , Protocolos Clínicos , Serviço Hospitalar de Emergência/ética , Reperfusão Miocárdica/ética , Infarto do Miocárdio com Supradesnível do Segmento ST/diagnóstico , Infarto do Miocárdio com Supradesnível do Segmento ST/terapia , Pesquisa Translacional Biomédica/ética , Medicina Baseada em Evidências , Fibrinolíticos/administração & dosagem , Humanos , México , Reperfusão Miocárdica/métodos , Reperfusão Miocárdica/estatística & dados numéricos , Reprodutibilidade dos Testes , Infarto do Miocárdio com Supradesnível do Segmento ST/mortalidade , Participação dos Interessados , Tempo para o Tratamento
14.
BMC Med Ethics ; 21(1): 117, 2020 11 19.
Artigo em Inglês | MEDLINE | ID: mdl-33213445

RESUMO

BACKGROUND: The Authors have laid out an analysis of Italian COVID-19 confirmed data and fatality rates, pointing out how a dearth of health care resources in northern regions has resulted in hard, ethically challenging decisions in terms of granting patient access to intensive care units (ICU). MAIN TEXT: Having to make such decisions certainly entails substantial difficulties, and that has led many health care professional to seek ethical guidance. The Italian Society of Anesthesia, Analgesia, Resuscitation and Intensive Care (SIAARTI) has attempted to meet that growing need by a set of recommendations, applying "clinical soundness" as a beacon standard; that approach tends to prioritize patients with higher life expectancy, which could be characterized as a "moderately utilitarian" approach. Yet, such a selection has engendered daunting ethical quandaries. The authors believe it can only be warranted and acceptable if rooted in a transparent decision-making process and verifiable, reviewed criteria. Moreover, the authors have stressed how clinical experimentation in a pandemic setting is a subtext of great interest from an ethical perspective. In Italy, no drug therapy and trials were undertaken for COVID-19 patients for a rather long period of time. When the epidemic was already circulating, an intervention proved necessary on the system of administrative procedures, aimed at expediting the authorization and validation of protocols, then bogged down by bureaucracy. A new system has since been instituted by a government decree that was signed about one month after the first Covid-19 case was officially recorded in the country. Such a swift implementation, which took just a few weeks, is noteworthy and proves that clinical trials can be initiated in a timely fashion, even with a pandemic unfolding. The concerted, action of supportive care and RCTs is the only way to attain effective forms of treatments for COVID-19 and any other future outbreak. CONCLUSIONS: The authors have arrived at the conclusion that the most effective and ethically sound response on the part of any national health care system would be to adequately reconfigure its organizational mechanisms, by making clinical trials and all related administrative procedures consistent with the current state of emergency.


Assuntos
Atitude do Pessoal de Saúde , COVID-19/epidemiologia , Serviço Hospitalar de Emergência/ética , Ética Médica , Alocação de Recursos para a Atenção à Saúde/ética , Estado Terminal/epidemiologia , Humanos , Itália
16.
J Law Med Ethics ; 48(3): 527-534, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-33021161

RESUMO

An estimated 6,500 undocumented immigrants in the United States have been diagnosed with end-stage renal disease (ESRD). These individuals are ineligible for the federal insurance program that covers dialysis and/or transplantation for citizens, and consequently are subject to local or state policies regarding the provision of healthcare. In 76% of states, undocumented immigrants are ineligible to receive scheduled outpatient dialysis treatments, and typically receive dialysis only when presenting to the emergency center with severe life-threatening symptoms. 'Emergency-only hemodialysis' (EOHD) is associated with higher healthcare costs, higher mortality, and longer hospitalizations. In this paper, we present an ethical critique of existing federal policy. We argue that EOHD represents a failure of fiduciary and professional obligations, contributes to moral distress, and undermines physician obligations to be good stewards of medical resources. We then explore potential avenues for reform based upon policies introduced at the state level. We argue that, while reform at the federal level would ultimately be a more sustainable long-term solution, state-based policy reforms can help mitigate the ethical shortcomings of EOHD.


Assuntos
Serviço Hospitalar de Emergência/ética , Política de Saúde/legislação & jurisprudência , Acessibilidade aos Serviços de Saúde/ética , Falência Renal Crônica/etnologia , Falência Renal Crônica/terapia , Diálise Renal/ética , Imigrantes Indocumentados/legislação & jurisprudência , Humanos , Estados Unidos
17.
Gac. méd. Méx ; 156(5): 372-378, sep.-oct. 2020. graf
Artigo em Espanhol | LILACS | ID: biblio-1249934

RESUMO

Resumen Introducción: México es el país con mayor mortalidad por infarto agudo de miocardio con elevación del segmento ST (IAM CEST), por lo que el Instituto Mexicano del Seguro Social desarrolló el protocolo de atención para los servicios de urgencias denominado Código Infarto. En este artículo se discuten aspectos de la medicina traslacional con una perspectiva bioética e integral. Objetivo: Analizar el protocolo Código Infarto desde la perspectiva de la bioética traslacional. Método: Se realizó una aproximación centrada en el problema a través del equilibrio reflexivo, así como la aplicación del método integral para el discernimiento ético. Resultados: El protocolo de atención para los servicios de urgencias Código Infarto se rige por la medicina basada en la evidencia y la medicina basada en valores; se orienta por el principio de integridad que considera las seis dimensiones de la calidad para la atención de pacientes con IAM CEST. Conclusión: El protocolo supera algunos determinantes sociales adversos que afectan la atención médica del IAM CEST, disminuye la mortalidad, la carga económica global de la enfermedad y desarrolla una medicina de excelencia de alto alcance social.


Abstract Introduction: Mexico is the country with the highest mortality due to ST-elevation acute myocardial infarction (STEMI), and the IMSS has therefore developed the protocol of care for emergency departments called Código Infarto (Infarction Code). In this article, aspects of translational medicine are discussed with a bioethical and comprehensive perspective. Objective: To analyze the Código Infarto protocol from the perspective of translational bioethics. Method: A problem-centered approach was carried out through reflective equilibrium (or Rawls' method), as well as by applying the integral method for ethical discernment. Results: The protocol of care for emergency services Código Infarto is governed by evidence-based medicine and value-based medicine; it is guided by a principle of integrity that considers six dimensions of quality for the care of patients with STEMI. Conclusion: The protocol overcomes some adverse social determinants that affect STEMI medical care, reduces mortality and global economic disease burden, and develops medicine of excellence with high social reach.


Assuntos
Humanos , Reperfusão Miocárdica/ética , Protocolos Clínicos , Temas Bioéticos , Serviço Hospitalar de Emergência/ética , Infarto do Miocárdio com Supradesnível do Segmento ST/diagnóstico , Infarto do Miocárdio com Supradesnível do Segmento ST/terapia , Reperfusão Miocárdica/estatística & dados numéricos , Reprodutibilidade dos Testes , Medicina Baseada em Evidências , Fibrinolíticos/administração & dosagem , Infarto do Miocárdio com Supradesnível do Segmento ST/mortalidade , Participação dos Interessados , México
18.
Hastings Cent Rep ; 50(3): 15-16, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32596903

RESUMO

Over the past year, our ethics service has had numerous consultations involving patients who use the emergency department for regular dialysis. Sometimes, they have access to outpatient hemodialysis that they forgo; other times, they've been "fired" from this kind of outpatient facility, and so the ED is their last option. In most of these cases, we're called because the patient is disruptive once admitted to the ICU and behavior plans haven't helped. But the call from a resident this March 2020 morning was different, the patient had end-stage renal disease and often missed hemodialysis, but he wasn't disruptive. "It's just that he comes in after using cocaine, and given scarcity with the coronavirus and ICU beds…." I have come to think that this is one of the more insidious effects of the pandemic: that there will be a resurgence of the view that some patients deserve health care by virtue of their compliant behavior and that those who are nonadherent don't.


Assuntos
Infecções por Coronavirus/epidemiologia , Serviço Hospitalar de Emergência/ética , Falência Renal Crônica/terapia , Pneumonia Viral/epidemiologia , Diálise Renal/ética , Betacoronavirus , COVID-19 , Transtornos Relacionados ao Uso de Cocaína/epidemiologia , Consultoria Ética , Alocação de Recursos para a Atenção à Saúde/ética , Humanos , Falência Renal Crônica/epidemiologia , Pandemias , Diálise Renal/métodos , SARS-CoV-2
20.
Emerg Med Australas ; 32(3): 520-524, 2020 06.
Artigo em Inglês | MEDLINE | ID: mdl-32275805

RESUMO

EDs fulfil a frontline function during public health emergencies (PHEs) and will play a pivotal role during the COVID-19 pandemic. This perspective article draws on qualitative data from a longitudinal, ethnographic study of an Australian tertiary ED to illustrate the clinical and ethical challenges faced by EDs during PHEs. Interview data collected during the 2014 Ebola Virus Disease PHE of International Concern suggest that ED clinicians have a strong sense of professional responsibility, but this can be compromised by increased visibility of risk and sub-optimal engagement from hospital managers and public health authorities. The study exposes the tension between a healthcare worker's right to protection and a duty to provide treatment. Given the narrow window of opportunity to prepare for a surge of COVID-19 presentations, there is an immediate need to reflect and learn from previous experiences. To maintain the confidence of ED clinicians, and minimise the risk of moral injury, hospital and public health authorities must urgently develop processes to support ethical healthcare delivery and ensure adequate resourcing of EDs.


Assuntos
Infecções por Coronavirus/diagnóstico , Coronavirus , Surtos de Doenças/ética , Medicina de Emergência/ética , Serviço Hospitalar de Emergência/ética , Pandemias/prevenção & controle , Pneumonia Viral/epidemiologia , Ventiladores Mecânicos/ética , Betacoronavirus , COVID-19 , Coronavirus/isolamento & purificação , Infecções por Coronavirus/epidemiologia , Infecções por Coronavirus/terapia , Tomada de Decisões , Surtos de Doenças/prevenção & controle , Serviços Médicos de Emergência , Doença pelo Vírus Ebola/epidemiologia , Humanos , Pneumonia Viral/diagnóstico , Pneumonia Viral/terapia , Saúde Pública , SARS-CoV-2 , Ventiladores Mecânicos/estatística & dados numéricos
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA