12 results on '"Deficiencia de alfa 1-antitripsina"'
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2. Infected tracheal diverticulum: a rare association with alpha-1 antitrypsin deficiency
- Author
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Cecília Beatriz Alves Amaral, Sónia Silva, and Salvato Feijó
- Subjects
Doenças da traqueia ,Enfisema pulmonar ,Divertículo ,Deficiência de alfa 1-antitripsina ,Diseases of the respiratory system ,RC705-779 - Abstract
Tracheal diverticulum, defined as a benign outpouching of the tracheal wall, is rarely diagnosed in clinical practice. It can be congenital or acquired in origin, and most cases are asymptomatic, typically being diagnosed postmortem. We report a case of a 69-year-old woman who was hospitalized after presenting with fever, fatigue, pleuritic chest pain, and a right neck mass complicated by dysphagia. Her medical history was significant: pulmonary emphysema (alpha-1 antitrypsin deficiency); bronchiectasis; and thyroidectomy. On physical examination, she presented diminished breath sounds and muffled heart sounds, with a systolic murmur. Laboratory tests revealed elevated inflammatory markers, a CT scan showed an air-filled, multilocular mass in the right tracheal wall, and magnetic resonance imaging confirmed the CT findings. Fiberoptic bronchoscopy failed to reveal any abnormalities. Nevertheless, the patient was diagnosed with tracheal diverticulum. The treatment approach was conservative, consisting mainly of antibiotics. After showing clinical improvement, the patient was discharged.
- Published
- 2014
- Full Text
- View/download PDF
3. Validation and development of an immunonephelometric assay for the determination of alpha-1 antitrypsin levels in dried blood spots from patients with COPD
- Author
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Laura Russo Zillmer, Rodrigo Russo, Beatriz Martins Manzano, Ivan Ivanaga, Oliver Augusto Nascimento, Altay Alves Lino de Souza, Gildo Santos Junior, Francisco Rodriguez, Marc Miravitlles, and Jose Roberto Jardim
- Subjects
Deficiencia de alfa 1-antitripsina ,Nefelometria e turbidimetria ,Doenca pulmonar obstrutiva cronica ,Diseases of the respiratory system ,RC705-779 - Abstract
OBJECTIVE: To validate and develop an immunonephelometric assay for the determination of alpha-1 antitrypsin (AAT) levels in dried blood spots from COPD patients in Brazil. METHODS: We determined AAT levels in serum samples and dried blood spots from 192 COPD patients. For the preparation of dried blood spots, a disk (diameter, 6 mm) was placed into a tube, eluted with 200 µL of PBS, and stored overnight at 4ºC. All of the samples were analyzed by immunonephelometry in duplicate. We used the bootstrap resampling method in order to determine a cut-off point for AAT levels in dried blood spots. RESULTS: The correlation coefficient between the AAT levels in serum samples and those in dried blood spots was r = 0.45. For dried blood spots, the cut-off value was 2.02 mg/dL (97% CI: 1.45-2.64 mg/dL), with a sensitivity, specificity, positive predictive value, and negative predictive value of 100%, 95.7%, 27.2%, and 100%, respectively. CONCLUSIONS: This method for the determination of AAT levels in dried blood spots appears to be a reliable screening tool for patients with AAT deficiency.
- Published
- 2013
- Full Text
- View/download PDF
4. Divertículo da traqueia infectado: um caso de associação rara com deficiência de alfa-1 antitripsina.
- Author
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Alves Amaral, Cecília Beatriz, Silva, Sónia, and Feijó, Salvato
- Subjects
TRACHEAL diseases ,DIVERTICULUM ,PULMONARY emphysema ,ALPHA 1-antitrypsin deficiency ,PATIENTS ,DIAGNOSIS ,THERAPEUTICS - Abstract
Copyright of Brazilian Journal of Pulmonology / Jornal Brasileiro de Pneumologia is the property of Sociedade Brasileira de Pneumologia e Tisiologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2014
- Full Text
- View/download PDF
5. Validation and development of an immunonephelometric assay for the determination of alpha-1 antitrypsin levels in dried blood spots from patients with COPD.
- Author
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Zillmer, Laura Russo, Russo, Rodrigo, Manzano, Beatriz Martins, Ivanaga, Ivan, Nascimento, Oliver Augusto, de Souza, Altay Alves Lino, Santos Júnior, Gildo, Rodriguez, Francisco, Miravitlles, Marc, and Jardim, José Roberto
- Subjects
NEPHELOMETRY ,BIOLOGICAL assay ,ALPHA 1-antitrypsin ,OBSTRUCTIVE lung diseases patients ,BLOOD testing - Abstract
Copyright of Brazilian Journal of Pulmonology / Jornal Brasileiro de Pneumologia is the property of Sociedade Brasileira de Pneumologia e Tisiologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2013
- Full Text
- View/download PDF
6. Infected tracheal diverticulum: a rare association with alpha-1 antitrypsin deficiency* **
- Author
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Salvato Feijó, Cecília Beatriz Alves Amaral, and Sónia Silva
- Subjects
Pulmonary and Respiratory Medicine ,medicine.medical_specialty ,Pulmonary emphysema ,medicine.medical_treatment ,Neck mass ,Divertículo ,Physical examination ,Case Report ,Asymptomatic ,alpha 1-antitrypsin deficiency ,Vancomycin ,medicine ,Deficiência de alfa 1-antitripsina ,Humans ,Medical history ,Aged ,lcsh:RC705-779 ,Enfisema pulmonar ,Bronchiectasis ,Tracheal Diseases ,medicine.diagnostic_test ,business.industry ,Thyroidectomy ,lcsh:Diseases of the respiratory system ,Meropenem ,medicine.disease ,Dysphagia ,Magnetic Resonance Imaging ,Surgery ,Anti-Bacterial Agents ,Diverticulum ,Doenças da traqueia ,Female ,Thienamycins ,Radiology ,medicine.symptom ,business ,Tomography, X-Ray Computed - Abstract
Tracheal diverticulum, defined as a benign outpouching of the tracheal wall, is rarely diagnosed in clinical practice. It can be congenital or acquired in origin, and most cases are asymptomatic, typically being diagnosed postmortem. We report a case of a 69-year-old woman who was hospitalized after presenting with fever, fatigue, pleuritic chest pain, and a right neck mass complicated by dysphagia. Her medical history was significant: pulmonary emphysema (alpha-1 antitrypsin deficiency); bronchiectasis; and thyroidectomy. On physical examination, she presented diminished breath sounds and muffled heart sounds, with a systolic murmur. Laboratory tests revealed elevated inflammatory markers, a CT scan showed an air-filled, multilocular mass in the right tracheal wall, and magnetic resonance imaging confirmed the CT findings. Fiberoptic bronchoscopy failed to reveal any abnormalities. Nevertheless, the patient was diagnosed with tracheal diverticulum. The treatment approach was conservative, consisting mainly of antibiotics. After showing clinical improvement, the patient was discharged.Divertículos da traqueia são evaginações benignas da parede traqueal e raramente diagnosticados na prática clínica. Podem ser congênitos ou adquiridos, e na maioria dos casos são assintomáticos, sendo tipicamente diagnosticados em estudos post-mortem. Relatamos o caso de uma mulher de 69 anos que foi hospitalizada após apresentar febre, fadiga, dor torácica pleurítica e uma massa cervical à direita complicada por disfagia. Tinha antecedentes pessoais de enfisema pulmonar (deficiência de alfa-1 antitripsina), bronquiectasias e tireoidectomia. Ao exame físico apresentava murmúrio vesicular diminuído, hipofonese cardíaca e um sopro sistólico. Laboratorialmente apresentava marcadores inflamatórios elevados, e uma TC mostrou uma massa aérea, multiloculada na parede direita da traqueia, achados confirmados por ressonância magnética nuclear. Realizou ainda uma fibrobroncoscopia que se revelou normal. Assumiu-se o diagnóstico de divertículo da traqueia. O tratamento proposto foi conservador, consistindo principalmente de antibioticoterapia. Após melhora clínica, a paciente recebeu alta.
- Published
- 2014
7. Alpha-1 antitrypsin Pi*Z gene frequency and Pi*ZZ genotype numbers worldwide: an update
- Author
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Marc Miravitlles, Cristina Esquinas, I. Diego, S Pérez-Holanda, Francisco Casas-Maldonado, Ignacio Blanco, Patricia Bueno, Institut Català de la Salut, [Blanco I] Alpha1-Antitrypsin Deficiency Spanish Registry (REDAAT), Fundación Respira, Spanish Society of Pneumology and Thoracic Surgery (SEPAR), Barcelona. [Bueno P] Internal Medicine Department, County Hospital of Jarrio. [Diego I] Materials and Energy Department, School of Mining Engineering, Oviedo University. [Pérez-Holanda S] Surgical Department, University Central Hospital of Asturias (HUCA), Oviedo, Principality of Asturias. [Casas-Maldonado F] Pneumology Department, Complejo Hospitalario Universitario de Granada, Granada. [Esquinas C] Servei de Pneumologia, Vall d’Hebron Hospital Universitari, Barcelona, Spain. [Miravitlles M] Servei de Pneumologia, Vall d’Hebron Hospital Universitari, Barcelona, Spain. CIBER de Enfermedades Respiratorias (CIBERES), Barcelona, Spain, Vall d'Hebron Barcelona Hospital Campus, [Blanco,I] Alpha1-Antitrypsin Deficiency Spanish Registry (REDAAT), Fundación Respira, Spanish Society of Pneumology and Thoracic Surgery (SEPAR), Barcelona. [Bueno,P] Internal Medicine Department, County Hospital of Jarrio. [Diego,L] Materials and Energy Department, School of Mining Engineering, Oviedo University. [Pérez-Holanda,S] Surgical Department, University Central Hospital of Asturias (HUCA), Oviedo, Principality of Asturias. [Casas-Maldonado,F] Pneumology Department, Complejo Hospitalario Universitario de Granada, Granada. [Esquinas,C, and Miravitlles,M] Pneumology Department, Hospital Universitari Vall d'Hebron. [Miravitlles,M] CIBER de Enfermedades Respiratorias (CIBERES), Barcelona, Spain.
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Nueva Zelanda ,Global Health ,Geographical Locations::Geographic Locations::Islands::Pacific Islands::New Zealand [Medical Subject Headings] ,Analytical, Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Statistics as Topic::Confidence Intervals [Medical Subject Headings] ,Alfa 1-antitripsina ,Epidemiologia genètica ,0302 clinical medicine ,epidemiología y bioestadística::epidemiología::estudios epidemiológicos::epidemiología molecular [SALUD PÚBLICA] ,Gene Frequency ,Health Care::Environment and Public Health::Public Health [Medical Subject Headings] ,Epidemiology ,Statistics ,Genotype ,Malalties hereditàries ,Prevalence ,Genetic epidemiology ,geographic information system ,Analytical, Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Data Collection::Vital Statistics::Morbidity::Prevalence [Medical Subject Headings] ,Original Research ,alpha-1 antitrypsin deficiency ,education.field_of_study ,Molecular Epidemiology ,Inverse distance weighted interpolation ,Enzyme inhibitors ,Deficiencia de alfa 1-antitripsina ,General Medicine ,Geographic information systems ,Analytical, Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Epidemiologic Research Design::Reproducibility of Results [Medical Subject Headings] ,Phenotype ,Alpha-1 antitrypsin deficiency ,030220 oncology & carcinogenesis ,SERPINA1 ,Phenomena and Processes::Genetic Phenomena::Genotype [Medical Subject Headings] ,Alelos ,Geographic information system ,Genetic diseases ,medicine.medical_specialty ,genetic epidemiology ,Analytical, Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Epidemiologic Research Design::Sample Size [Medical Subject Headings] ,Geographical Locations::Geographic Locations::Africa [Medical Subject Headings] ,Epidemiologia molecular ,Population ,Alpha (ethology) ,International Journal of Chronic Obstructive Pulmonary Disease ,Salud Pública ,protease inhibitor ,03 medical and health sciences ,Región del Caribe ,enfermedades respiratorias::enfermedades pulmonares::deficiencia de alfa 1-antitripsina [ENFERMEDADES] ,alpha 1-Antitrypsin Deficiency ,medicine ,Humans ,Europa (Continente) ,Genetic Predisposition to Disease ,Respiratory Tract Diseases::Lung Diseases::alpha 1-Antitrypsin Deficiency [DISEASES] ,Geographical Locations::Geographic Locations::Asia [Medical Subject Headings] ,Allele ,education ,Allele frequency ,Phenomena and Processes::Genetic Phenomena::Genetic Structures::Genome::Genome Components::Genes::Alleles [Medical Subject Headings] ,Diseases::Congenital, Hereditary, and Neonatal Diseases and Abnormalities::Genetic Diseases, Inborn::alpha 1-Antitrypsin Deficiency [Medical Subject Headings] ,Epidemiology and Biostatistics::Epidemiology::Epidemiologic Studies::Molecular Epidemiology [PUBLIC HEALTH] ,Sistemes d'informació geogràfica ,África ,Intervalos de confianza ,Models, Genetic ,Reproducibilidad de resultados ,business.industry ,Geographical Locations::Geographic Locations::Australia [Medical Subject Headings] ,Geographical Locations::Geographic Locations::Americas::Caribbean Region [Medical Subject Headings] ,inverse distance weighted interpolation ,Tamaño de la Muestra ,Confidence interval ,Genetics, Population ,Inhibidors enzimàtics ,Protease inhibitor ,030228 respiratory system ,Sample size determination ,alpha 1-Antitrypsin ,Mutation ,Geographical Locations::Geographic Locations::Europe [Medical Subject Headings] ,Prevalencia ,business ,Genotipo - Abstract
Ignacio Blanco,1 Patricia Bueno,2 Isidro Diego,3 Sergio Pérez-Holanda,4 Francisco Casas-Maldonado,5 Cristina Esquinas,6 Marc Miravitlles6,7 1Alpha1-Antitrypsin Deficiency Spanish Registry (REDAAT), Fundación Respira, Spanish Society of Pneumology and Thoracic Surgery (SEPAR), Barcelona, 2Internal Medicine Department, County Hospital of Jarrio, 3Materials and Energy Department, School of Mining Engineering, Oviedo University, 4Surgical Department, University Central Hospital of Asturias (HUCA), Oviedo, Principality of Asturias, 5Pneumology Department, Complejo Hospitalario Universitario de Granada, Granada, 6Pneumology Department, Hospital Universitari Vall d’Hebron, 7CIBER de Enfermedades Respiratorias (CIBERES), Barcelona, Spain Abstract: In alpha-1 antitrypsin deficiency (AATD), the Z allele is present in 98% of cases with severe disease, and knowledge of the frequency of this allele is essential from a public health perspective. However, there is a remarkable lack of epidemiological data on AATD worldwide, and many of the data currently used are outdated. Therefore, the objective of this study was to update the knowledge of the frequency of the Z allele to achieve accurate estimates of the prevalence and number of Pi*ZZ genotypes worldwide based on studies performed according to the following criteria: 1) samples representative of the general population, 2) AAT phenotyping characterized by adequate methods, and 3) measurements performed using a coefficient of variation calculated from the sample size and 95% confidence intervals. Studies fulfilling these criteria were used to develop maps with an inverse distance weighted (IDW)-interpolation method, providing numerical and graphical information of Pi*Z distribution worldwide. A total of 224 cohorts from 65 countries were included in the study. With the data provided by these cohorts, a total of 253,404 Pi*ZZ were estimated worldwide: 119,594 in Europe, 91,490 in America and Caribbean, 3,824 in Africa, 32,154 in Asia, 4,126 in Australia, and 2,216 in New Zealand. In addition, the IDW-interpolation maps predicted Pi*Z frequencies throughout the world even in some areas that lack real data. In conclusion, the inclusion of new well-designed studies and the exclusion of the low-quality ones have significantly improved the reliability of results, which may be useful to plan strategies for future research and diagnosis and to rationalize the therapeutic resources available. Keywords: SERPINA1, alpha-1 antitrypsin deficiency, protease inhibitor, genetic epidemiology, inverse distance weighted interpolation, geographic information system
- Published
- 2017
8. DPOC por déficit de alfa1-antitripsina vs. DPOC por outras causas : o mesmo processo, um paradigma diferente
- Author
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Jasmins, Clara Sofia Freitas and Martins, Catarina Venâncio Teles Castro
- Subjects
Deficiência de alfa 1-Antitripsina ,alfa 1-Antitripsina ,Ciências Médicas [Domínio/Área Científica] ,Doença pulmonar obstrutiva crónica (DPOC) - Abstract
Trabalho Final do Curso de Mestrado Integrado em Medicina, Faculdade de Medicina, Universidade de Lisboa, 2015 Submitted by Biblioteca da Faculdade de Medicina da Universidade de Lisboa (repositorio@medicina.ulisboa.pt) on 2016-12-13T12:19:02Z No. of bitstreams: 1 ClaraSFJasmins.pdf: 980852 bytes, checksum: 59c7b1766c97d3d52f8b627b45cc286e (MD5) Made available in DSpace on 2016-12-13T15:54:30Z (GMT). No. of bitstreams: 1 ClaraSFJasmins.pdf: 980852 bytes, checksum: 59c7b1766c97d3d52f8b627b45cc286e (MD5) Previous issue date: 2015
- Published
- 2015
9. Divertículo da traqueia infectado: um caso de associação rara com deficiência de alfa-1 antitripsina
- Author
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Amaral,Cecília Beatriz Alves, Silva,Sónia, and Feijó,Salvato
- Subjects
Pulmonary emphysema ,Diverticulum ,Doenças da traqueia ,Enfisema pulmonar ,Deficiência de alfa 1-antitripsina ,Divertículo ,Tracheal diseases ,alpha 1-antitrypsin deficiency - Abstract
Tracheal diverticulum, defined as a benign outpouching of the tracheal wall, is rarely diagnosed in clinical practice. It can be congenital or acquired in origin, and most cases are asymptomatic, typically being diagnosed postmortem. We report a case of a 69-year-old woman who was hospitalized after presenting with fever, fatigue, pleuritic chest pain, and a right neck mass complicated by dysphagia. Her medical history was significant: pulmonary emphysema (alpha-1 antitrypsin deficiency); bronchiectasis; and thyroidectomy. On physical examination, she presented diminished breath sounds and muffled heart sounds, with a systolic murmur. Laboratory tests revealed elevated inflammatory markers, a CT scan showed an air-filled, multilocular mass in the right tracheal wall, and magnetic resonance imaging confirmed the CT findings. Fiberoptic bronchoscopy failed to reveal any abnormalities. Nevertheless, the patient was diagnosed with tracheal diverticulum. The treatment approach was conservative, consisting mainly of antibiotics. After showing clinical improvement, the patient was discharged. Divertículos da traqueia são evaginações benignas da parede traqueal e raramente diagnosticados na prática clínica. Podem ser congênitos ou adquiridos, e na maioria dos casos são assintomáticos, sendo tipicamente diagnosticados em estudos post-mortem. Relatamos o caso de uma mulher de 69 anos que foi hospitalizada após apresentar febre, fadiga, dor torácica pleurítica e uma massa cervical à direita complicada por disfagia. Tinha antecedentes pessoais de enfisema pulmonar (deficiência de alfa-1 antitripsina), bronquiectasias e tireoidectomia. Ao exame físico apresentava murmúrio vesicular diminuído, hipofonese cardíaca e um sopro sistólico. Laboratorialmente apresentava marcadores inflamatórios elevados, e uma TC mostrou uma massa aérea, multiloculada na parede direita da traqueia, achados confirmados por ressonância magnética nuclear. Realizou ainda uma fibrobroncoscopia que se revelou normal. Assumiu-se o diagnóstico de divertículo da traqueia. O tratamento proposto foi conservador, consistindo principalmente de antibioticoterapia. Após melhora clínica, a paciente recebeu alta.
- Published
- 2014
10. Desenvolvimento e validação de um método de imunonefelometria em amostras de sangue em papel-filtro para a dosagem da alfa-1 antitripsina em pacientes com DPOC
- Author
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Gildo Santos Junior, Laura Russo Zillmer, José Roberto Jardim, Oliver A. Nascimento, Rodrigo Russo, Marc Miravitlles, Beatriz Martins Manzano, Francisco Rodriguez, Altay Alves Lino de Souza, Ivan Ivanaga, Universidade Federal de São Paulo (UNIFESP), Afip Laboratory Department of Molecular Biology, and Vall d'Hebron University Hospital Departments of Biochemistry and Pulmonology
- Subjects
Male ,Pulmonary and Respiratory Medicine ,congenital, hereditary, and neonatal diseases and abnormalities ,Pathology ,medicine.medical_specialty ,Nephelometry and turbidimetry ,Alpha (ethology) ,Immunologic Tests ,Pulmonary disease, chronic obstructive ,alpha 1-antitrypsin deficiency ,Predictive Value of Tests ,Outpatients ,Doença pulmonar obstrutiva crônica ,medicine ,Humans ,Mass Screening ,Deficiência de alfa 1-antitripsina ,Dried blood ,Mass screening ,Aged ,lcsh:RC705-779 ,Nefelometria e turbidimetria ,COPD ,Alpha 1-antitrypsin deficiency ,Chromatography ,Artigos Originais ,Spots ,business.industry ,Original Articles ,lcsh:Diseases of the respiratory system ,Deficiencia de alfa 1-antitripsina ,Middle Aged ,Reference Standards ,medicine.disease ,Predictive value ,Doenca pulmonar obstrutiva cronica ,Cross-Sectional Studies ,alpha 1-Antitrypsin ,Predictive value of tests ,Female ,Dried Blood Spot Testing ,business ,Brazil - Abstract
OBJETIVO: Validar e desenvolver um método de dosagem de alfa-1 antitripsina (AAT) por imunonefelometria em amostras de sangue em papel-filtro em pacientes com DPOC no Brasil.MÉTODOS:Amostras de soro e de sangue em papel-filtro de 192 pacientes com DPOC foram utilizadas para a dosagem de AAT. Para a preparação das amostras de sangue em papel-filtro, um disco do papel com diâmetro de 6 mm foi colocado em um tubo e eluído com 200 µL de PBS, permanecendo por toda a noite a 4ºC. Todas as amostras foram analisadas em duplicata por imunonefelometria. O método de reamostragem bootstrap foi utilizado para a determinação de um ponto de corte para o nível de AAT nas amostras de sangue em papel-filtro.RESULTADOS:O coeficiente de correlação entre os níveis de AAT em soro e em sangue em papel-filtro foi de r = 0,45. Para as amostras em papel-filtro, o ponto de corte foi de 2,02 mg/dL (IC97%: 1,45-2,64 mg/dL), com sensibilidade, especificidade, valor preditivo positivo e valor preditivo negativo de 100%, 95,7%, 27,2% e 100%, respectivamente.CONCLUSÕES:Este método de determinação dos níveis de AAT em sangue em papel-filtro se mostrou uma ferramenta confiável para o rastreamento de pacientes com deficiência de AAT. OBJECTIVE:To validate and develop an immunonephelometric assay for the determination of alpha-1 antitrypsin (AAT) levels in dried blood spots from COPD patients in Brazil.METHODS:We determined AAT levels in serum samples and dried blood spots from 192 COPD patients. For the preparation of dried blood spots, a disk (diameter, 6 mm) was placed into a tube, eluted with 200 µL of PBS, and stored overnight at 4ºC. All of the samples were analyzed by immunonephelometry in duplicate. We used the bootstrap resampling method in order to determine a cut-off point for AAT levels in dried blood spots.RESULTS:The correlation coefficient between the AAT levels in serum samples and those in dried blood spots was r = 0.45. For dried blood spots, the cut-off value was 2.02 mg/dL (97% CI: 1.45-2.64 mg/dL), with a sensitivity, specificity, positive predictive value, and negative predictive value of 100%, 95.7%, 27.2%, and 100%, respectively.CONCLUSIONS:This method for the determination of AAT levels in dried blood spots appears to be a reliable screening tool for patients with AAT deficiency. Universidade Federal de São Paulo (UNIFESP) Department of Pulmonology Pulmonary Rehabilitation Center Universidade Federal de São Paulo (UNIFESP) Escola Paulista de Medicina Department of Pulmonology Universidade Federal de São Paulo (UNIFESP) Escola Paulista de Medicina Department of Psychobiology Afip Laboratory Department of Molecular Biology Vall d'Hebron University Hospital Departments of Biochemistry and Pulmonology UNIFESP, Department of Pulmonology Pulmonary Rehabilitation Center UNIFESP, EPM, Department of Pulmonology UNIFESP, EPM, Department of Psychobiology SciELO
- Published
- 2013
11. Validation of a immune nephelometric method on filter paper for the diagnosis of alpha 1 antitrypsin in Brazil
- Author
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Zillmer, Laura [UNIFESP], Universidade Federal de São Paulo (UNIFESP), and Jardim, José Roberto [UNIFESP]
- Subjects
Testes Diagnósticos de Rotina ,Deficiência de alfa 1-Antitripsina ,Doença Pulmonar Obstrutiva Crônica ,Humanos - Abstract
Associação Fundo de Incentivo à Psicofarmacologia (AFIP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Introdução: A deficiência de alfa-1 antitripsina é uma desordem genética que resulta no aparecimento precoce de enfisema pulmonar e doença hepática. A Organização Mundial de Saúde e American Thoracic Society /European Respiratory Society preconizam que os pacientes com doença pulmonar obstrutiva crônica realizem o rastreamento para deficiência de alfa-1 antitripsina. No entanto, existe a necessidade de exames mais acessíveis para possibilitar a realização dessa orientação em países com extensa dimensão territorial, como o Brasil. A técnica em papel filtro é um procedimento simples, que tem sido amplamente utilizado para o rastreamento genético e diagnóstico de diversas doenças. Objetivo: Validação do método de dosagem de alfa-1 antitripsina por imunonefelometria em amostras de papel filtro em pacientes com doença pulmonar obstrutiva crônica no Brasil. Métodos: Foi analisada a dosagem da alfa-1 antitripsina plasmática e em papel filtro de 192 pacientes com doença pulmonar obstrutiva crônica. Para a análise o papel filtro (WhatmanTM, GE, 903, lot W101, USA) foi picotado em discos com diâmetro de 6 mm e, posteriormente, diluídos em 200 µL de soro fisiológico permanecendo a 4ºC durante 12 horas. Tanto as amostras de papel filtro quanto de plasma foram analisadas no equipamento da Siemens BNII pelo método de imunonefelometria. Resultados: O coeficiente de correlação entre a concentração de alfa-1 antitripsina sérica e no papel filtro foi de r= 0,45. Através da técnica de reamostragem “bootstrap” foi determinado um ponto de corte de 2,02 mg/dl, com um intervalo de confiança de 1,45 – 2,64 mg/dL (97%), para o papel filtro. Com o ponto de corte de 2,02 no papel filtro foi observado sensibilidade de 100%, especificidade de 95,7% e valor preditivo positivo de 27,2% e negativo de 100%. Conclusão: O método em papel filtro se mostrou uma ferramenta confiável para o rastreamento de pacientes com deficiência de alfa-1 antitripsina. Entretanto, recomenda-se que os indivíduos que apresentarem valores da alfa-1 antitripsina no papel filtro abaixo do valor máximo do intervalo de confiança (2,64 mg/dL) sejam investigados por meio de testes mais específicos, garantindo maior confiabilidade ao método. Introduction: The deficiency of alpha-1 antitrypsin is a genetic disorder that results in early onset of emphysema and liver disease. The World Health Organization and American Thoracic Society /European Respiratory Society recommend that patients with chronic obstructive lung disease perform screening for alpha-1 antitrypsin deficiency. However, we see the need for testing more accessible, thus enabling the realization of this approach in countries with extensive territorial dimension, such as Brazil. A technical with dried blood spots is a simple method that has been widely used for genetic screening and diagnosis of various diseases. Objective: to determine the accuracy of the dried blood spots for quantifying alpha-1 antitrypsin concentrations by immunonephelometry in patients with chronic obstructive lung disease in Brazil. Method: Serum and dried blood spots samples were tested for alpha-1 antitrypsin in 192 patients with chronic obstructive lung disease. To prepare the dried blood spots perforated discs with a diameter of 6 mm were obtained from the paper filter (WhatmanTM, GE, 903, lot W101, USA) and then eluted with 200 µmL phosphatebuffered saline (pH 7.4) overnight at 4ºC. Serum and dried blood spots samples were determined using a rate immune nephelometric method (Siemens, BNII). Results: The correlation coefficient between the concentration of alpha-1 antitrypsin in serum and dried blood spots was r = 0.45. By resampling technique "bootstrap" determined a cutoff value of 2.02 mg / dl with a confidence interval 1.45 to 2.64 mg / dL (97%) to the filter paper. With a cutoff of 2.02 observed in dried blood spots sensitivity 100%, specificity 95.7% and positive predictive value of 27.2% and 100% negative. However, we recommend that individuals, who present values of alpha-1 antitrypsin in filter paper below the maximum value of the confidence interval (2.64 mg / dL), are investigated through more specific tests, ensuring greater reliability of the method. Conclusion: In view of the excellent sensitivity and specificity the dried blood spot quantitative assay is a reliable screening tool for the detection of patients with alpha1 antitrypsin deficiency. For the safety of not failing to diagnose a deficient individual we recommend that all individuals with values below the highest of the confidence interval value should be serum tested. BV UNIFESP: Teses e dissertações
- Published
- 2013
12. Titulo em ingles: Allelic frequency of SERPINA1 gene in patients with alpha-1 antitrypsin deficiency and COPD in Brazil
- Author
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Russo, Rodrigo [UNIFESP], Universidade Federal de São Paulo (UNIFESP), and Jardim, José Roberto [UNIFESP]
- Subjects
Doença Pulmonar Obstrutiva Crônica/epidemiologia ,Deficiência de alfa 1-Antitripsina ,Alelos ,Serpinas ,Humanos - Abstract
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Introdução: A defiCiência de alfa 1-antitripsina (DAAT) e um disturbio genetico descoberto ha 50 anos, com diversas implicacoes clinicas, que afeta especialmente pulmao e figado. Esta defiCiência e o fator genetico mais notorio, associado ao aumento do risco do desenvolvimento de doenca pulmonar obstrutiva cronica em fumantes. Seu diagnostico envolve a deteccao de niveis sericos reduzidos e determinacao genotipica. Apesar de sua importancia, nao existem dados epidemiologicos brasileiros a respeito da prevalencia da defiCiência e, ou da frequencia de ocorrencias dos alelos deficientes. Objetivo: Este estudo visa a reconhecer a DAAT, em uma populacao de individuos com DPOC, e a realizar a determinacao dos genotipos encontrados, assim como a frequencia alelica dos alelos envolvidos nesta doenca: Materiais e Metodo: Trata-se de um estudo transversal, envolvendo 1073 pacientes. Destes 926 tinham diagnostico de DPOC, com relacao VEF1/CVF abaixo do limite inferior do normal, em idade superior a 40 anos, de ambos os sexos, pertencentes a cinco estados brasileiros (São Paulo, Pernambuco, Goias, Ceara e Rio Grande do Sul). Caracterizou-se pela dosagem de AAT em eluato de papel filtro, por nefelometria e, nos individuos identificados como possiveis deficientes, pela dosagem de AAT serica. Todos aqueles com dosagem serica de AAT < 113 mg/dL foram submetidos a genotipagem e, nos casos de resultados discordantes, foi realizado o sequenciamento genetico por PCR. Resultados: Dos pacientes incluidos no estudo, 85 tinham dosagem de AAT em eluato de papel filtro ≤ 2,64 mg/dL e 24 (2,8% do total) tinham dosagem serica < 113 mg/dL. Os alelos encontrados neste subgrupo foram: Pi*Z (54,2%), Pi*M (31,3%), Pi*S (12,5%), Pi*M1 (2,1%). Para a populacao total do estudo, a estimativa da defiCiência de AAT intermediaria a grave foi 2,8% e, somente para a defiCiência grave (ZZ) de AAT, a estimativa de prevalencia foi 0,8%. Conclusao: Este e o primeiro estudo destinado a estabelecer a prevalencia da defiCiência de AAT e a frequencia dos alelos envolvidos, em pacientes com DPOC, no Brasil. As frequencias encontradas mostram que a defiCiência de AAT esta presente em pacientes com DOPC, no Brasil, e reforcam as diretrizes mundiais que incentivam sua pesquisa em individuos com doenca pulmonar obstrutiva BV UNIFESP: Teses e dissertações
- Published
- 2013
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