RESUMO
BACKGROUND: The present study aimed to demonstrate the applicability of a flow cytometry-based serology approach to identify spontaneous cure by the detection of immunoglobulin G, and also, the diagnosis and cure criterion by the IgG1 isotype in American Tegumentary Leishmaniasis - ATL caused by L. (V.) braziliensis. Also, a comparison between flow cytometry with the serological conventional technique was performed. METHODS: Forty five individuals were included in study. They were assessed in two moments: First, 8 subjects spontaneously cured of ATL, 8 healthy individuals and 15 patients who had a positive diagnosis for ATL were selected before treatment to identify spontaneous cure by immunoglobulin G detection. Secondly, 14 patients who were positive for ATL were selected and had their blood collected before and 1, 2 and 5 years after treatment, respectively, for the diagnostic tests (ELISA and flow cytometry) and cure criterion evaluation using the IgG1 isotype. RESULTS: The analysis of the mean percentage of positive fluorescent parasites (PPFP) along with the titration curves of IgG anti-fixed promastigotes of L.(V.)braziliensis, confirmed the applicability of this method for monitoring spontaneous cure in ATL with outstanding co-positivity (100%) and co-negativity (100%) performance indexes. Regarding the results of the comparison between flow cytometry and ELISA it was seen that there was a better accuracy of the first one in relation to the other. When IgG1 applicability was evaluated, it was observed that before treatment, 36.8% of the patients were negative; in patients 1 year post-treatment, 82.3%; 2 years post-treatment, 27.2% and in patients 5 years post-treatment, 87.5%. The overall analysis of the results suggests that flow cytometry can be applied to ATL detection, and that the use of IgG1 isotype has possibilities to contribute as a more specific diagnostic method. CONCLUSIONS: Therefore, this area has great perspectives use for the diagnosis and cure criterion, and also it can be scaled up with the possibility to characterize the different clinical stages of the disease. Together, these findings demonstrate the applicability of a flow cytometry-based serology approach and opens up new avenues of research with this technique, such as the understanding the humoral response in ATL patients.
Assuntos
Leishmania braziliensis/imunologia , Leishmaniose Cutânea/diagnóstico , Anticorpos Antiprotozoários/sangue , Antiprotozoários/uso terapêutico , Área Sob a Curva , Ensaio de Imunoadsorção Enzimática , Citometria de Fluxo , Humanos , Imunoglobulina G/sangue , Leishmania braziliensis/isolamento & purificação , Leishmaniose Cutânea/tratamento farmacológico , Curva ROC , Remissão EspontâneaRESUMO
An acute case of Chagas disease was studied in 1944, with clinical and laboratory follow-up until 2007, in Bambuí, Minas Gerais, Brazil. A five-year-old girl living in a rural hut that was highly infested with Triatoma infestans presented a febrile clinical condition compatible with the acute form of trypanosomiasis. She presented a positive thick blood smear, but never again showed serological and/or parasitological evidence of Trypanosoma cruzi infection, on several occasions. This patient never received any specific treatment and, to this day, she remains completely asymptomatic, with normal findings from clinical, electrocardiographic, X-ray and echocardiographic examinations.
Um caso agudo de doença de Chagas foi estudado em 1944, com seguimento clínico e laboratorial até 2007, em Bambuí, Minas Gerais, Brasil. Vivendo em rancho rural altamente infestado por Triatoma infestans, e apresentando um quadro clínico febril compatível com forma aguda da tripanossomíase, uma menina de cinco anos teve gota espessa positiva, nunca mais apresentando evidências sorológicas ou parasitológicas de infecção pelo Trypanosoma cruzi, em variadas oportunidades. A paciente nunca foi tratada especificamente e permanece, até o presente, completamente assintomática, com exames clínicos eletrocardiográficos, radiológicos e ecocardiográficos normais.
Assuntos
Idoso , Pré-Escolar , Feminino , Humanos , Doença de Chagas , Doença Aguda , Estudos Longitudinais , Remissão EspontâneaRESUMO
Objetivo: El síndrome de Brown (SB) se caracteriza por restricción activa y pasiva de la elevación en adducción. Puede ser congénito o adquirido, intermitente o permanente, uni o bilateral; este último se presenta en el 10 por ciento de los casos. Nuestro objetivo es describir 9 casos de SB bilateral y revisar la literatura al respecto. Pacientes: se describen características clínicas de 9 casos y se revisa la literatura. Resultados: De los 9 casos, 2 eran de sexo masculino, y 7 de sexo femenino. Edad promedio: 5.7 años. 1 caso intermitente. Los casos publicados en diferentes series son: 13/126 (Brown), 3/8 (Clark y Noel), 7/36 (Waddell ) y 1/30 (Eustis). Entre los casos bilaterales hay alta incidencia de casos familiares. Conclusión: Se confirma que el cuadro es más común en mujeres. 7/9 tenía alineamiento en posición primaria. Todos tenían déficit bilateral de elevación y anisotropía en V. Frente a un caso de SB bilateral es conveniente examinar a los familiares en busca de casos asintomáticos.
Objective: The motility defect known as Brown´s síndrome is characterized by active and passive restriction of elevation in adduction. It may be either congenital or acquired, intermittent or permanent, uni or bilateral. It is bilateral in 10 percent of cases. Our purpose is to report 9 cases with bilateral Brown´s syndrome and review the cases previously published. Patients: 9 cases are described: 2 males and 7 females, average age 5,7 years who had bilateral Brown´s syndrome and review. Results: 9 cases are described: 2 males and 7 females, average age 5,7 years who had bilateral Brown´s syndrome, 1 of them was intermittent. Bilateral cases published are: 13/126 in Brown´s series, 3/28 in Clark and Noel´s, 7/36 in Waddell´s and 1/30 in that of Eustis. Among bilateral cases there is a striking incidence of familial cases. Conclusion: Brown´s statement that the disorder is more common in females than in males is confirmed in our series. It should be noted that 7 out of 9 of these patients had normal alignment in primary gaze. All cases had bilateral elevation deficit and V pattern. In bilateral cases examination of the relatives should be performed in order to detect asymptomatic familial cases.