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PURPOSE OF REVIEW: To summarize the latest developments in rheumatic fever and rheumatic heart disease (RHD) prevention, (early) diagnosis, and treatment. RECENT FINDINGS: The revised Jones criteria have demonstrated increased sensitivity and specificity for rheumatic fever diagnosis in high-risk populations. The management of rheumatic fever remains symptom-based, with no treatment options proven to alter the disease course or prevent chronic RHD. The revised World Heart Federation (WHF) guidelines for the echocardiographic diagnosis of RHD encourage task-shifting of RHD screening, extending reach in endemic regions. These guidelines also present an A-D classification of RHD and provide recommendations for the management of early disease. Integrated models for RHD screening within existing health structures are emerging and automated intelligence is showing potential to support RHD screening and diagnosis. Innovative strategies to foster adherence and equitable access to secondary prophylaxis, such as re-examination of the efficacy of oral penicillin, trials of longer acting penicillin formulations and implants are underway. There is renewed interest and investment in a well tolerated and effective GAS vaccine. SUMMARY: We are living in a time of possibility with global acceleration to address the prevailing burden of RHD. Together, we can ensure that RHD does not once again fall off the global health agenda, until equitable elimination has been achieved.
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Febre Reumática , Cardiopatia Reumática , Humanos , Cardiopatia Reumática/diagnóstico , Cardiopatia Reumática/terapia , Cardiopatia Reumática/prevenção & controle , Febre Reumática/diagnóstico , Febre Reumática/terapia , Febre Reumática/prevenção & controle , Antibacterianos/uso terapêutico , Diagnóstico Precoce , Guias de Prática Clínica como Assunto , Ecocardiografia , Programas de Rastreamento/métodos , Criança , Vacinas Estreptocócicas/uso terapêuticoRESUMO
Sydenham's chorea (SC), an autoimmune disorder affecting the central nervous system, is a pivotal diagnostic criterion for acute rheumatic fever. Primarily prevalent in childhood, especially in developing countries, SC manifests with involuntary movements and neuropsychiatric symptoms. Predominantly occurring between ages 5 and 15, with a female bias, SC may recur, particularly during pregnancy or estrogen use. The autoimmune response affecting the basal ganglia, notably against dopamine, underlies the pathophysiology. Clinical management necessitates an integrated approach, potentially involving immunomodulatory therapies. To address discrepancies in SC management, a survey was conducted across Italy, targeting specialists in neurology, pediatrics, child neuropsychiatry, and rheumatology. Of the 51 responding physicians, consensus favored hospitalization for suspected SC, with broad support for laboratory tests and brain MRI. Treatment preferences showed agreement on oral prednisone and IVIG, while opinions varied on duration and plasmapheresis. Haloperidol emerged as the preferred symptomatic therapy. Post-SC penicillin prophylaxis and steroid therapy gained strong support, although opinions differed on duration. Follow-up recommendations included neuropsychological and cardiological assessments. Despite offering valuable insights, broader and more studies are needed in order to guide treatment decisions in this well-known yet challenging complication of acute rheumatic fever, which continues to warrant scientific attention and concerted clinical efforts.
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Coreia , Humanos , Coreia/terapia , Coreia/etiologia , Itália , Criança , Feminino , Masculino , Pré-Escolar , Gerenciamento Clínico , Adolescente , Inquéritos e Questionários , Febre Reumática/complicações , Febre Reumática/terapiaRESUMO
Group A Streptococcus causes a variety of clinical manifestations, including pharyngitis and skin and soft tissue infections as well as more invasive disease. There are also multiple nonsuppurative complications of group A Streptococcus infection, including acute rheumatic fever and poststreptococcal glomerulonephritis. Pediatricians should be able to diagnose and treat the various presentations of the infection.
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Glomerulonefrite , Faringite , Febre Reumática , Infecções Estreptocócicas , Humanos , Infecções Estreptocócicas/complicações , Infecções Estreptocócicas/diagnóstico , Infecções Estreptocócicas/terapia , Febre Reumática/complicações , Febre Reumática/diagnóstico , Febre Reumática/terapia , Streptococcus pyogenes , Glomerulonefrite/complicações , Glomerulonefrite/diagnóstico , Faringite/diagnóstico , Faringite/etiologiaRESUMO
Rheumatic fever is an autoimmune disease characterized by recurring acute or chronic systemic connective tissue inflammation caused by group A streptococcal infection in the throat. Although rheumatic fever is common in China, there is a lack of standardized criteria for the diagnosis and treatment of this condition. Based on evidence and guidelines from China and other countries, the Chinese Rheumatology Association developed standardized criteria for the diagnosis and treatment of this disease in China. The aim was to standardize rheumatic fever diagnosis methods, treatment opportunities, and strategies for both short-and long-term treatment, so as to reduce irreversible damage and improve prognosis.
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Doenças Autoimunes , Febre Reumática , Humanos , China , Assistência de Longa Duração , Febre Reumática/diagnóstico , Febre Reumática/terapiaRESUMO
It is a sad reality that although eminently preventable, and despite possessing such knowledge for >70 years, rheumatic heart disease (RHD) remains the most common cause of cardiovascular morbidity and early mortality in young people worldwide. A disease of the poor, RHD is one of the most neglected diseases. Several challenges are unique to the acute rheumatic fever/RHD continuum and contribute to its persistence, including its sequestration among the poorest, its protracted natural history, the erratic availability of penicillin, and the lack of a concerted effort in endemic regions. However, there is cause for optimism following a resurgence in scientific interest over the last 15 years. This review presents the latest advancements in epidemiology, diagnosis, and management. It also discusses pressing research questions on disease pathophysiology, the barriers to implementation of effective management strategies, and pragmatic policy solutions required for translation of current knowledge into meaningful action.
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Febre Reumática , Cardiopatia Reumática , Humanos , Adolescente , Cardiopatia Reumática/diagnóstico , Cardiopatia Reumática/epidemiologia , Cardiopatia Reumática/terapia , Febre Reumática/diagnóstico , Febre Reumática/epidemiologia , Febre Reumática/terapia , Progressão da Doença , Penicilinas , Ecocardiografia/efeitos adversosRESUMO
BACKGROUND: Acute rheumatic fever (ARF) and rheumatic heart disease (RHD) disproportionately affect Aboriginal and Torres Strait Islander people in Australia, with devastating impacts on morbidity, mortality and community wellbeing. Research suggests that general practitioners and primary care staff perceive insurmountable barriers to improving clinical outcomes, including the need for systemic change outside their scope of practice. OBJECTIVE: The aim of this article is to identify constructive, micro-level strategies that primary healthcare clinicians can consider, adopt and sustainably use to improve care for people with ARF and RHD in their routine clinical practice. DISCUSSION: Through skilled clinical care, reflection and culturally safe practices, individual primary healthcare clinicians have substantial capacity to improve care experiences and outcomes for Aboriginal and Torres Strait Islander people and communities affected by ARF and RHD.
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Clínicos Gerais , Febre Reumática , Cardiopatia Reumática , Humanos , Cardiopatia Reumática/terapia , Febre Reumática/terapia , Austrália , Atenção Primária à SaúdeRESUMO
PURPOSE: To create a cohort with high specificity for moderate and severe rheumatic heart disease (RHD) in New Zealand, not reliant on International Classification of Diseases discharge coding. To describe the demography and cardiac profile of this historical and contemporary cohort. DESIGN AND PARTICIPANTS: Retrospective identification of moderate or severe RHD with disease onset by 2019. Case identification from the following data sources: cardiac surgical databases, RHD case series, percutaneous balloon valvuloplasty databases, echocardiography databases, regional rheumatic fever registers and RHD clinic lists. The setting for this study was a high-income country with continued incidence of acute rheumatic fever (ARF). FINDINGS TO DATE: A Registry cohort of 4959 patients was established. The initial presentation was RHD without recognised prior ARF in 41%, and ARF in 59%. Ethnicity breakdown: Maori 38%, Pacific 33.5%, European 21.9%, other 6.7%. Ethnic disparities have changed significantly over time. Prior to 1960, RHD cases were 64.3% European, 25.3% Maori and 6.7% Pacific. However, in contrast, from 2010 to 2019, RHD cases were 10.7% European, 37.4% Maori and 47.2% Pacific.Follow-up showed 32% had changed region of residence within New Zealand from their initial presentation. At least one cardiac intervention (cardiac surgery, transcatheter balloon valvuloplasty) was undertaken in 64% of the cohort at a mean age of 40 years. 19.8% of the cohort had multiple cardiac interventions. At latest follow-up, 26.9% of the cohort died. Of those alive, the mean follow-up is 20.5+19.4 years. Maori and Pacific led governance groups have been established to provide data governance and oversight for the registry. FUTURE PLANS: Detailed mortality and morbidity of the registry cases will be defined by linkage to New Zealand national health data collections. The contemporary cohort of the registry will be available for future studies to improve clinical management and outcomes for the 3450 individuals living with chronic RHD.
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Febre Reumática , Cardiopatia Reumática , Humanos , Adulto , Cardiopatia Reumática/epidemiologia , Cardiopatia Reumática/terapia , Estudos Retrospectivos , Nova Zelândia/epidemiologia , Febre Reumática/epidemiologia , Febre Reumática/terapia , Sistema de RegistrosRESUMO
BACKGROUND: Acute rheumatic fever (ARF) and rheumatic heart disease (RHD) are rare in high-income countries; however, in Aotearoa New Zealand ARF and RHD disproportionately affect Indigenous Maori and Pacific Peoples. This narrative review explores the evidence regarding non-surgical management of patients with clinically significant valve disease or heart failure due to RHD. METHODS: Medline, EMBASE and Scopus databases were searched, and additional publications were identified through cross-referencing. Included were 28 publications from 1980 onwards. RESULTS: Of the available interventions, improved anticoagulation management and a national RHD register could improve RHD outcomes in New Zealand. Where community pharmacy anticoagulant management services (CPAMS) are available good anticoagulation control can be achieved with a time in the therapeutic range (TTR) of more than 70%, which is above the internationally recommended level of 60%. The use of pharmacists in anticoagulation control is cost-effective, acceptable to patients, pharmacists, and primary care practitioners. There is a lack of local data available to fully assess other interventions; including optimal therapy for heart failure, equitable access to specialist RHD care, prevention, and management of endocarditis. CONCLUSION: As RHD continues to disproportionately affect Indigenous and minority groups, pro-equity tertiary prevention interventions should be fully evaluated to ensure they are reducing disease burden and improving outcomes in patients with RHD.
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Insuficiência Cardíaca , Febre Reumática , Cardiopatia Reumática , Humanos , Cardiopatia Reumática/epidemiologia , Cardiopatia Reumática/terapia , Febre Reumática/terapia , Havaiano Nativo ou Outro Ilhéu do Pacífico , Insuficiência Cardíaca/tratamento farmacológico , Anticoagulantes/uso terapêuticoRESUMO
Sydenham's Chorea (SC) is a hyperkinetic movement disorder associated with neuropsychiatric manifestations. It is believed to be caused by the autoimmune response following a group A beta-hemolytic streptococcal (GABHS) pharyngitis, and it is one of the major diagnostic criteria for Acute Rheumatic Fever (ARF) diagnosis. Despite having been known and studied for centuries, there are still no standardized therapies or official guidelines for SC treatment, so that it is necessarily left to physicians' clinical experience. Antibiotic treatment, symptomatic therapies, and immunomodulatory treatment are the three pillars upon which SC patients' management is currently based, but they still lack a solid scientific basis. The aim of this writing is precisely to review the state of the art of SC's treatment, with an overview of the advances made in the last 5 years. However, since the therapeutic uncertainties are a mere reflection of the severe gap of knowledge that concerns SC's pathogenesis and manifestations, the importance of high-quality research studies based on homogenized methodologies, instruments, and measured outcomes will also be stressed.
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Coreia , Febre Reumática , Coreia/diagnóstico , Coreia/tratamento farmacológico , Coreia/etiologia , Humanos , Conhecimento , Febre Reumática/complicações , Febre Reumática/diagnóstico , Febre Reumática/terapia , Incerteza , RedaçãoRESUMO
Rheumatic Fever (RF)/ Rheumatic Heart Disease (RHD) is the result of autoimmune response triggered by group A Beta-haemolytic streptococcal pharyngitis leading to immune-inflammatory injury to cardiac valves. It is practically disappeared in developed countries. However, it continues to be a major cause of disease burden among children, adolescents, and young adults in low-income countries and even in high-income countries with socioeconomic inequalities. For decades, many cases of Acute Rheumatic Fever (ARF) and RHD were missed and were denied the secondary prophylaxis, as a result these patients used to end up with complications and untimely death. Advanced understanding of the echocardiography can prevent both under diagnosis and over diagnosis and thus help in management strategy. Another new advancement in recent past is the mitral valve repair, which is technically demanding, and the results are acceptable in experienced cardiac surgical units. Whenever feasible, valve repair should be preferred over valve replacement since it precludes the need for anticoagulation and future risks of prosthesis dysfunction.
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Faringite , Febre Reumática , Cardiopatia Reumática , Adolescente , Criança , Ecocardiografia , Humanos , Índia/epidemiologia , Sobrediagnóstico , Febre Reumática/diagnóstico , Febre Reumática/epidemiologia , Febre Reumática/terapia , Cardiopatia Reumática/diagnóstico , Cardiopatia Reumática/epidemiologia , Cardiopatia Reumática/terapia , Adulto JovemRESUMO
Background Recent evaluation of rheumatic heart disease (RHD) mortality demonstrates disproportionate disease burden within the United States. However, there are few contemporary data on US children living with acute rheumatic fever (ARF) and RHD. Methods and Results Twenty-two US pediatric institutions participated in a 10-year review (2008-2018) of electronic medical records and echocardiographic databases of children 4 to 17 years diagnosed with ARF/RHD to determine demographics, diagnosis, and management. Geocoding was used to determine a census tract-based socioeconomic deprivation index. Descriptive statistics of patient characteristics and regression analysis of RHD classification, disease severity, and initial antibiotic prescription according to community deprivation were obtained. Data for 947 cases showed median age at diagnosis of 9 years; 51% and 56% identified as male and non-White, respectively. Most (89%) had health insurance and were first diagnosed in the United States (82%). Only 13% reported travel to an endemic region before diagnosis. Although 96% of patients were prescribed secondary prophylaxis, only 58% were prescribed intramuscular benzathine penicillin G. Higher deprivation was associated with increasing disease severity (odds ratio, 1.25; 95% CI, 1.08-1.46). Conclusions The majority of recent US cases of ARF and RHD are endemic rather than the result of foreign exposure. Children who live in more deprived communities are at risk for more severe disease. This study demonstrates a need to improve guideline-based treatment for ARF/RHD with respect to secondary prophylaxis and to increase research efforts to better understand ARF and RHD in the United States.
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Cardiopatia Reumática/epidemiologia , Adolescente , Fatores Etários , Criança , Pré-Escolar , Feminino , Humanos , Masculino , Prognóstico , Estudos Retrospectivos , Febre Reumática/diagnóstico , Febre Reumática/epidemiologia , Febre Reumática/terapia , Cardiopatia Reumática/diagnóstico , Cardiopatia Reumática/terapia , Medição de Risco , Fatores de Risco , Índice de Gravidade de Doença , Classe Social , Determinantes Sociais da Saúde , Fatores de Tempo , Viagem , Estados UnidosRESUMO
During the 1920s, acute rheumatic fever (ARF) was the leading cause of mortality in children in the United States. By the 1980s, many felt ARF had all but disappeared from the US. However, although ARF and rheumatic heart disease (RHD) rates remain low in the US today, disease burden is unequal and tracks along other disparities of cardiovascular health. It is estimated that 1% to 3% of patients with untreated group A streptococcus (GAS) infection, most typically GAS pharyngitis, will develop ARF, and of these, up to 60% of cases will result in chronic RHD. This article reviews the epidemiology, pathogenesis, diagnosis, and management of ARF/RHD to increase awareness of ARF/RHD for clinicians based in the US. [Pediatr Ann. 2021;50(3):e98-e104.].
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Febre Reumática , Cardiopatia Reumática , Criança , Humanos , Faringite , Febre Reumática/diagnóstico , Febre Reumática/epidemiologia , Febre Reumática/terapia , Cardiopatia Reumática/diagnóstico , Cardiopatia Reumática/epidemiologia , Cardiopatia Reumática/terapia , Streptococcus pyogenes , Estados Unidos/epidemiologiaRESUMO
RHD in pregnancy (RHD-P) is associated with an increased burden of maternal and perinatal morbidity and mortality. A sequellae of rheumatic fever resulting in heart valve damage if untreated, RHD is twice as common in women. In providing an historical overview, this commentary provides context for prevention and treatment in the 21 st century. Four underlying themes inform much of the literature on RHD-P: its association with inequities; often-complex care requirements; demands for integrated care models, and a life-course approach. While there have been some gains particularly in awareness, strengthened policies and funding strategies are required to sustain improvements in the RHD landscape and consequently improve outcomes. As the principal heart disease seen in pregnant women in endemic regions, it is unlikely that the Sustainable Development Goal 3 target of reduced global maternal mortality ratio can be met by 2030 if RHD is not better addressed for women and girls.
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Febre Reumática , Cardiopatia Reumática , Feminino , Humanos , Gravidez , Febre Reumática/terapia , Cardiopatia Reumática/prevenção & controle , Cardiopatia Reumática/terapiaRESUMO
INTRODUCTION: Acute rheumatic fever (ARF) and rheumatic heart disease (RHD) cause significant morbidity and premature mortality among Australian Aboriginal and Torres Strait Islander peoples. RHDAustralia has produced a fully updated clinical guideline in response to new knowledge gained since the 2012 edition. The guideline aligns with major international ARF and RHD practice guidelines from the American Heart Association and World Heart Federation to ensure best practice. The GRADE system was used to assess the quality and strength of evidence where appropriate. MAIN RECOMMENDATIONS: The 2020 Australian guideline details best practice care for people with or at risk of ARF and RHD. It provides up-to-date guidance on primordial, primary and secondary prevention, diagnosis and management, preconception and perinatal management of women with RHD, culturally safe practice, provision of a trained and supported Aboriginal and Torres Strait Islander workforce, disease burden, RHD screening, control programs and new technologies. CHANGES IN MANAGEMENT AS A RESULT OF THE GUIDELINE: Key changes include updating of ARF and RHD diagnostic criteria; change in secondary prophylaxis duration; improved pain management for intramuscular injections; and changes to antibiotic regimens for primary prevention. Other changes include an emphasis on provision of culturally appropriate care; updated burden of disease data using linked register and hospitalisations data; primordial prevention strategies to reduce streptococcal infection addressing household overcrowding and personal hygiene; recommendations for population-based echocardiographic screening for RHD in select populations; expanded management guidance for women with RHD or ARF to cover contraception, antenatal, delivery and postnatal care, and to stratify pregnancy risks according to RHD severity; and a priority classification system for presence and severity of RHD to align with appropriate timing of follow-up.
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Febre Reumática/diagnóstico , Febre Reumática/terapia , Cardiopatia Reumática/diagnóstico , Cardiopatia Reumática/terapia , Austrália , Diagnóstico Diferencial , Medicina Baseada em Evidências , Humanos , Havaiano Nativo ou Outro Ilhéu do Pacífico , Guias de Prática Clínica como Assunto , Prevenção Primária , Febre Reumática/prevenção & controle , Cardiopatia Reumática/prevenção & controle , Prevenção SecundáriaRESUMO
Rheumatic heart disease (RHD) is a serious and long-term consequence of acute rheumatic fever (ARF), an autoimmune sequela of a mucosal infection by Streptococcus pyogenes (Group A Streptococcus, Strep A). The pathogenesis of ARF and RHD is complex and not fully understood but involves host and bacterial factors, molecular mimicry, and aberrant host innate and adaptive immune responses that result in loss of self-tolerance and subsequent cross-reactivity with host tissues. RHD is entirely preventable yet claims an estimated 320 000 lives annually. The major burden of disease is carried by developing nations and Indigenous populations within developed nations, including Australia. This review will focus on the epidemiology, pathogenesis and treatment of ARF and RHD in Australia, where: streptococcal pyoderma, rather than streptococcal pharyngitis, and Group C and Group G Streptococcus, have been implicated as antecedents to ARF; the rates of RHD in remote Indigenous communities are persistently among the highest in the world; government register-based programs coordinate disease screening and delivery of prophylaxis with variable success; and researchers are making significant progress in the development of a broad-spectrum vaccine against Strep A.
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Febre Reumática , Cardiopatia Reumática , Infecções Estreptocócicas , Austrália , Humanos , Pesquisa , Febre Reumática/diagnóstico , Febre Reumática/epidemiologia , Febre Reumática/terapia , Cardiopatia Reumática/diagnóstico , Cardiopatia Reumática/epidemiologia , Cardiopatia Reumática/terapia , Infecções Estreptocócicas/epidemiologia , Streptococcus pyogenesRESUMO
BACKGROUND AND CONTEXT Rheumatic fever inequitably affects Maori and Pacific children in New Zealand. School-based throat swabbing services, such as the South Auckland Mana Kidz programme, are a key element of rheumatic fever prevention interventions. ASSESSMENT OF THE PROBLEM Counties Manukau has the highest national rates of rheumatic fever (4.7 per 100,000 for first recorded rates). Given these disparities, Mana Kidz undertook an exploratory, community-based initiative to improve its service delivery for Pacific Peoples. RESULTS Mana Kidz held a Pacific Leaders' Fono (meeting) to discuss initiatives to improve rheumatic fever outcomes in South Auckland focused around challenges and solutions for addressing rheumatic fever, effective engagement strategies and leadership qualities needed to drive initiatives. Oral and written responses from 66 attendees were collected and thematically analysed. Four key themes were identified around challenges and solutions for rheumatic fever: social determinants of health; cultural responsiveness; health system challenges; and education, promotion and literacy. Three effective engagement strategies were identified: by Pacific for Pacific; developing a rheumatic fever campaign; improving health services. Three key leadership attributes were identified: culturally responsive leaders; having specific expertise and skills; youth-driven leadership. STRATEGIES FOR IMPROVEMENT Mana Kidz has now created Pacific leadership roles in rheumatic fever governance groups, promotes Pacific workforce development and endorses Pacific-led initiatives and partnerships. LESSONS Recognising the value of critical reflection and the importance of good governance and collaborative, right-based partnerships in health services.
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Serviços de Saúde do Indígena/organização & administração , Havaiano Nativo ou Outro Ilhéu do Pacífico , Febre Reumática/etnologia , Serviços de Saúde Escolar/organização & administração , Adolescente , Criança , Competência Cultural , Feminino , Educação em Saúde/organização & administração , Letramento em Saúde , Acessibilidade aos Serviços de Saúde/organização & administração , Humanos , Liderança , Masculino , Nova Zelândia , Melhoria de Qualidade/organização & administração , Febre Reumática/diagnóstico , Febre Reumática/terapia , Determinantes Sociais da SaúdeAssuntos
Progressão da Doença , Doenças das Valvas Cardíacas/fisiopatologia , Hemodinâmica/fisiologia , Faringite/fisiopatologia , Cardiopatia Reumática/fisiopatologia , Infecções Estreptocócicas/fisiopatologia , Doenças das Valvas Cardíacas/epidemiologia , Doenças das Valvas Cardíacas/terapia , Humanos , Faringite/epidemiologia , Faringite/terapia , Febre Reumática/epidemiologia , Febre Reumática/fisiopatologia , Febre Reumática/terapia , Cardiopatia Reumática/epidemiologia , Cardiopatia Reumática/terapia , Infecções Estreptocócicas/epidemiologia , Infecções Estreptocócicas/terapia , Fator de Crescimento Transformador beta1/fisiologiaRESUMO
Although acute poststreptococcal glomerulonephritis (APSGN) and acute rheumatic fever (ARF) are well-known complications of group A streptococcus infection, concomitant occurrence of both diseases is rare. We report an 11-year-old Japanese girl with primary Sjögren's syndrome complicated by acute renal failure about 2 weeks after the onset of pharyngitis. Although histopathological findings of the kidney were not confirmative, APSGN was suggested by the spontaneous recovery of her renal function, typical latent period with high levels of antistreptolysin O and low serum levels of C3 but not of C4. In addition, cardiac hypomotility and regurgitation of the 4 valves progressed in the convalescent phase of APSGN, which was accompanied by elevation of serum C-reactive protein and plasma brain natriuretic peptide (BNP) levels. Myocarditis was suggested by delayed gadolinium-enhancement of cardiac walls on cardiac magnetic resonance imaging. She was diagnosed with APSGN and ARF and was treated with a combination of short course prednisolone and prophylactic penicillin G. There is no relapse of renal or cardiac symptoms during 6 years follow-up. Unexpected elevation of plasma BNP in a convalescent stage of APSGN suggests the development of ARF. Underlying Sjögren's syndrome (SS) may modify the histopathological findings and make it difficult to differentiate APSGN from CTD-associated nephritis such as lupus nephritis (LN) even by renal biopsy.