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Slater C, Camanho LEM, Saad EB, Inacio Jr LAO, Dias LC, Santos GV, Mourilhe-Rocha R. Safety and effectiveness of His-bundle pacing and left bundle branch pacing (conduction system pacing) as a first option for cardiac pacing – results of a single-center. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Conduction system pacing (CSP) (His bundle pacing and left bundle pacing) is a group of techniques intended to achieve cardiac pacing with a narrow QRS complex through a lead directly inserted in conduction system structures. The safety and effectiveness of this technique are not yet fully understood.
Purpose
To describe the short-term implant findings and safety profile of CSP as a first option after 4 years in a single center.
Methods
In a period of 42 months, 214 patients were submitted to CSP as a first strategy to restore AV synchrony (pacemakers for AV block or sinus node dysfunction) or as a resynchronization (CRT) strategy (for patients with heart failure and bundle branch block). CSP lead was implanted in lieu of a conventional right ventricular lead in pacemaker cases, and in addition or in lieu of a coronary sinus lead, in CRT cases, depending on the technical and anatomical possibilities.
Results
The mean age was 76.7±16.4 years, 65% males. 162 patients implanted a CSP lead for a dual-chamber pacemaker, 3 patients for a single chamber pacemaker, 32 patients for CRT-D (CSP lead replacing the coronary sinus lead with a defibrillator), and 13 patients for an optimized CRT (CSP lead plus coronary sinus lead). In 16 patients (7.4%) the technique of choice was His bundle pacing, two of them presented with subacute elevated thresholds, requiring new lead implantation at the moment of generator pulse replacement. One patient submitted to left bundle branch pacing (0.4%) had subacute lead dislodgement, being submitted to lead revision. Four patients intended for CRT (1.8%) didn't meet the criteria for His bundle pacing or left bundle branch pacing, being submitted to conventional coronary sinus lead placement. There were 10 cases (4.6%) of confirmed lead perforation during the lead septum insertion, with prompt repositioning, all uneventful. No pericardium effusion related to lead perforation was observed. One patient (0.4%) had a pneumothorax, requiring chest tube drainage.
Conclusion
Conduction system pacing as a first strategy is a feasible, effective and safe technique, both for pacing and for resynchronization purposes, with a complication rate comparable to conventional implantation.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- C Slater
- State University of Rio de Janeiro (UERJ) , Rio de Janeiro , Brazil
| | - L E M Camanho
- State University of Rio de Janeiro (UERJ) , Rio de Janeiro , Brazil
| | - E B Saad
- Hospital Pro Cardiaco , Rio de Janeiro , Brazil
| | | | - L C Dias
- State University of Rio de Janeiro (UERJ) , Rio de Janeiro , Brazil
| | - G V Santos
- Hospital Pro Cardiaco , Rio de Janeiro , Brazil
| | - R Mourilhe-Rocha
- State University of Rio de Janeiro (UERJ) , Rio de Janeiro , Brazil
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2
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Lima RME, Reis LDA, Lara FSTD, Dias LC, Matsumoto M, Mizubuti GB, Hamaji A, Cabral LW, Mathias LADST, Lima LHNE. [Recommendations for local-regional anesthesia during the COVID-19 pandemic]. Rev Bras Anestesiol 2020; 70:159-164. [PMID: 32600800 PMCID: PMC7286242 DOI: 10.1016/j.bjan.2020.05.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 05/25/2020] [Accepted: 05/28/2020] [Indexed: 12/14/2022] Open
Abstract
Desde o início da pandemia de COVID‐19, muitas questões surgiram referentes à segurança do manejo anestésico de pacientes acometidos pela doença. A anestesia regional, seja esta periférica ou neuroaxial, é alternativa segura no manejo do paciente COVID‐19, desde que o emprego de modalidades que minimizam o comprometimento da função pulmonar seja escolhido. A adoção dessa técnica anestésica minimiza os efeitos adversos no pós‐operatório e oferece segurança para o paciente e equipe, desde que sejam respeitados os cuidados com proteção individual e de contágio interpessoal. Respeito às contraindicações e emprego criterioso das técnicas e normas de segurança são fundamentais. Este manuscrito tem por objetivo revisar as evidências disponíveis sobre anestesia regional em pacientes com COVID‐19 e oferecer recomendações práticas para sua realização segura e eficiente.
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Affiliation(s)
- Rodrigo Moreira E Lima
- Queens University, Department of Anesthesia and Perioperative Medicine, Kingston, Ontario, Canada
| | | | | | - Lino Correa Dias
- Hospital Beneficência Portuguesa de Ribeirão Preto, Serviço de Anestesiologia, Ribeirão Preto, SP, Brasil
| | - Márcio Matsumoto
- Hospital Oswaldo Cruz, São Paulo, SP, Brasil; Hospital Samaritano, São Paulo, SP, Brasil; Hospital Sírio Libanês, Serviços Médicos de Anestesia (SMA), São Paulo, SP, Brasil
| | | | - Adilson Hamaji
- Universidade de São Paulo (USP), Hospital das Clínicas da Faculdade de Medicina, Serviço de Anestesia do Instituto de Ortopedia e Traumatologia, São Paulo, SP, Brasil
| | - Lucas Wynne Cabral
- Universidade Federal de Sergipe, Hospital Universitário, Serviço de Anestesia, Aracaju, SE, Brasil
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3
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Lima RME, Reis LDA, Thyrso de Lara FS, Dias LC, Matsumoto M, Mizubuti GB, Hamaji A, Cabral LW, Mathias LADST, Lima LHNE. Recommendations for local-regional anesthesia during the COVID-19 pandemic. Braz J Anesthesiol 2020; 70:159-164. [PMID: 32834193 PMCID: PMC7286225 DOI: 10.1016/j.bjane.2020.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 05/28/2020] [Indexed: 11/25/2022] Open
Abstract
Since the beginning of the COVID-19 pandemic, many questions have come up regarding safe anesthesia management of patients with the disease. Regional anesthesia, whether peripheral nerve or neuraxial, is a safe alternative for managing patients with COVID-19, by choosing modalities that mitigate pulmonary function involvement. Adopting regional anesthesia mitigates adverse effects in the post-operative period and provides safety to patients and teams, as long as there is compliance with individual protection and interpersonal transmission care measures. Respecting contra-indications and judicial use of safety techniques and norms are essential. The present manuscript aims to review the evidence available on regional anesthesia for patients with COVID-19 and offer practical recommendations for safe and efficient performance.
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Affiliation(s)
- Rodrigo Moreira E Lima
- Queens University, Department of Anesthesia and Perioperative Medicine, Kingston, Ontario, Canada
| | | | | | - Lino Correa Dias
- Hospital Beneficência Portuguesa de Ribeirão Preto, Serviço de Anestesiologia, Ribeirão Preto, SP, Brazil
| | - Márcio Matsumoto
- Hospital Oswaldo Cruz, São Paulo, SP, Brazil.,Hospital Samaritano, São Paulo, SP, Brazil.,Hospital Sírio Libanês, Serviços Médicos de Anestesia (SMA), São Paulo, SP, Brazil
| | | | - Adilson Hamaji
- Universidade de São Paulo (USP), Hospital das Clínicas da Faculdade de Medicina, Serviço de Anestesia do Instituto de Ortopedia e Traumatologia, São Paulo, SP, Brazil
| | - Lucas Wynne Cabral
- Universidade Federal de Sergipe, Hospital Universitário, Serviço de Anestesia, Aracajú, SE, Brazil
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4
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Fonseca-Silva T, Santos CCO, Alves LR, Dias LC, Brito M, De Paula AMB, Guimarães ALS. Detection and quantification of mast cell, vascular endothelial growth factor, and microvessel density in human inflammatory periapical cysts and granulomas. Int Endod J 2012; 45:859-64. [PMID: 22486765 DOI: 10.1111/j.1365-2591.2012.02043.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AIM To identify and quantify mast cell (MC), vascular endothelial growth factor (VEGF) expression and microvessel density (MVD) in human periapical cysts and granulomas. METHODOLOGY Archived samples of cysts (n = 40) and granulomas (n = 28) were sectioned and stained with toluidine blue. MCs were identified and counted. Immunohistochemical reactions were employed to evaluate the tissue expression of VEGF and vessels. MVD was estimated by determining the areas of tissue labelled with CD31 antibody. The data were analysed using the Mann-Whitney test (P < 0.05). RESULTS MCs were observed in the peripheral regions of both lesion types, whilst VEGF and MVD were distributed in the stroma. The presence of MCs was higher in cysts than in granulomas (P < 0.05). VEGF and MVD expression were similar in these lesions. CONCLUSIONS The highest number of MCs was observed in cysts. Moreover, the identification of VEGF and MVD was consistent with the immune mechanisms involved in the lesions.
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Affiliation(s)
- T Fonseca-Silva
- Department of Dentistry, State University of Montes Claros, Montes Claros, MG, Brazil
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5
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Coles GC, Bruce JI, Kinoti GK, Mutahi WT, Dias LC, Rocha RS, Katz N. The potential for drug resistance in schistosomiasis. ACTA ACUST UNITED AC 2005; 3:349-50. [PMID: 15462884 DOI: 10.1016/0169-4758(87)90121-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Abstract
The total synthesis of (+)-crocacin C is described. The convergent asymmetric synthesis relies on the use of a regio- and diastereoselective epoxidation of an allylic alcohol with m-CPBA followed by epoxide opening with Me(2)CuCNLi(2) and a Stille cross-coupling between E-vinyl stannane 5 and E-vinyl iodide 6 to establish the (E,E)-dienamide moiety. [structure: see text]
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Affiliation(s)
- L C Dias
- Instituto de Química, Universidade Estadual de Campinas, UNICAMP, C.P. 6154, 13083-970 Campinas, SP, Brazil.
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Zukerman-Schpector J, Vega M, Caracelli I, Dias LC, Fernandes AM. Two intermediates in the synthesis of decahydroisoquinolines with NMDA and AMPA receptor antagonist activity. Acta Crystallogr C 2001; 57:1089-91. [PMID: 11588380 DOI: 10.1107/s0108270101009702] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2001] [Accepted: 06/12/2001] [Indexed: 11/10/2022] Open
Abstract
In 6-methyl-N-(4-nitrobenzoyl)-5,6-dihydropyridin-2(1H)-one, C(13)H(12)N(2)O(4), (I), the piperidone ring is in a distorted half-chair conformation. In 8-methoxy-3-methyl-N-(4-nitrobenzoyl)-1,2,3,4,5,6,7,8-octahydroisoquinoline-1,6-dione, C(18)H(20)N(2)O(6), (II), the heterocyclic ring is in a slightly distorted half-boat conformation, while the other six-membered ring is in a distorted chair conformation. Compound (II) presents a strong intramolecular C-H...O hydrogen bond. In both (I) and (II), the molecules interact through C-H...O interactions.
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Camargo-Neves VL, Kanamura HY, Vellosa SA, Gargioni C, Dias LC. IgM antibodies to Schistosoma mansoni gut-associated antigens for the study of schistosomiasis transmission in Ribeirão Pires, São Paulo. Mem Inst Oswaldo Cruz 1999; 93 Suppl 1:273-8. [PMID: 9921369 DOI: 10.1590/s0074-02761998000700053] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The potential of an immunofluorescence test for detection of IgM antibodies against Schistosoma mansoni gut-associated antigens (IgM-IFT) was evaluated as a tool for studying aspects related to the schistosomiasis transmission in Ribeirão Pires, in the metropolitan area of the capital of the State of São Paulo, Brazil. Children from a school with about 400 students, 6 to 18 years, were followed-up for two years. In the five surveys, carried out at 6-month intervals, from October 92 to October 94, serological (IgM-IFT) prevalence indices of 5.3%, 5.8%, 6.2%, 2.9% and 3.3% were obtained. These indices were 7 to 10 times higher than the parasitological prevalence indices of 0.5%, 0.5%, 0.7%, 0.4% and 0% determined by the Kato-Katz method. Seroconversion from IFT negative to positive was indicating possible newly acquired S. mansoni infection in three children. But confirmation of infection by fecal examination was possible in only one child. The IgM-IFT can constitute a valuable tool for the improvement of the vigilance program in low endemic areas for schistosomiasis, better characterizing the S. mansoni transmission in such areas.
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Affiliation(s)
- V L Camargo-Neves
- Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Brasil
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9
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Lima VL, Guercio VM, Rangel O, Kanamura HY, Dias LC. Immunofluorescence test on Schistosoma mansoni worm paraffin sections (IgM-IFT) for the study of schistosomiasis transmission in Campinas, São Paulo, Brazil. Mem Inst Oswaldo Cruz 1999; 93 Suppl 1:283-7. [PMID: 9921371 DOI: 10.1590/s0074-02761998000700055] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The detection of IgM antibodies for Schistosoma mansoni using gut-associated antigens (IgM-IFT) was compared to the parasitological Kato-Katz method for study of the transmission of schistosomiasis in an urban area in Campinas. About 400 schoolchildren whose ages ranged from 6 to 18 years, were observed for a period of two years. Blood samples on filter paper and fecal samples were collected, at intervals of six months. Serological (IgM-IFT) prevalence rates of 1.2%, 4.3%, 3.6%, 2.9% and 3.4% were obtained in five surveys carried out. S. mansoni eggs were detected in only one child out of the 225 children (0.4%) who were submitted to the Kato-Katz method (three slides for each fecal sample) in the 1st survey. Sixty eight children who submitted five blood samples, one for each survey, were found IFT negative throughout the study. No child was found to be IFT positive in all five surveys, and only four children showed IFT positive results in at least four surveys. Seroconversion from IFT negative to positive was observed from the 1st to the 2nd survey in six children, from the 2nd to the 3rd survey in three children, from the 3rd to the 4th survey in four children, and from the 4th to the 5th survey in two cases. However, confirmation of S. mansoni infection using the fecal examination was not possible in any of the cases. Also, in most of them the IFT result oscillated from negative to positive and vice versa. Our data implied that recent transmission of schistosomiasis in the study area was not possible.
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Affiliation(s)
- V L Lima
- Instituto Adolfo Lutz, Campinas, SP, Brasil.
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10
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Kanamura HY, Dias LC, Glasser CM, da Silva RM, Patucci RM, Chiodelli SG, Addiss DG. Detection of IgM antibodies to Schistosoma mansoni gut-associated antigens for the study of the dynamics of schistosomiasis transmission in an endemic area with low worm burden. Rev Inst Med Trop Sao Paulo 1998; 40:225-31. [PMID: 9876435 DOI: 10.1590/s0036-46651998000400004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
For a period of 2 years, five follow-up measures of prevalence and incidence rates were estimated in a prospective study of S. mansoni infection in a group of schoolchildren who were living in a rural area of the Municipality of Itariri (São Paulo, Brazil), where schistosomiasis is transmitted by Biomphalaria tenagophila. Infection was determined by the examination of three Kato-Katz stool slides, and the parasitological findings were analyzed in comparison to serological data. In the five surveys, carried out at 6-month intervals (March-April and September-October), the prevalences were, respectively, 8.6, 6.8, 9.9, 5.8 and 17.2% by the Kato-Katz, and 56.5, 52.6, 60.8, 53.5 and 70.1% by the immunofluorescence test (IFT). Geometric mean egg counts were low: 57.8, 33.0, 35.6, 47.3 and 40.9 eggs per gram of feces, respectively. Of the total of 299 schoolchildren, who submitted five blood samples at 6-month intervals, one for each survey, 40% were IFT-positive throughout the study, and 22% were IFT-negative in all five surveys. Seroconversion from IFT negative to positive, indicating newly acquired S. mansoni infection, was observed more frequently in surveys carried out during March-April (after Summer holidays), than during September-October. Seasonal trends were not statistically significant for detection of S. mansoni eggs in stool. The results indicate that the use of IgM-IFT is superior to parasitological methods for detection of incidence of S. mansoni infection in areas with low worm burden.
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Affiliation(s)
- H Y Kanamura
- Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Brazil.
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11
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Kanamura HY, Dias LC, da Silva RM, Glasser CM, Patucci RM, Vellosa SA, Antunes JL. A comparative epidemiologic study of specific antibodies (IgM and IgA) and parasitological findings in an endemic area of low transmission of schistosoma mansoni. Rev Inst Med Trop Sao Paulo 1998; 40:85-91. [PMID: 9755561 DOI: 10.1590/s0036-46651998000200004] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The diagnostic potential of circulating IgM and IgA antibodies against Schistosoma mansoni gut-associated antigens detected by the immunofluorescence test (IFT) on adult worm paraffin sections was evaluated comparatively to the fecal parasitological method, for epidemiological purposes in low endemic areas for schistosomiasis. Blood samples were collected on filter paper from two groups of schoolchildren living in two different localities of the municipality of Itariri (São Paulo, Brazil) with different histories and prevalences of schistosomiasis. The parasitological and serological data were compared to those obtained for another group of schoolchildren from a non-endemic area for schistosomiasis. The results showed poor sensitivity of the parasitological method in detecting individuals with low worm burden and indicate the potential of the serological method as an important tool to be incorporated into schistosomiasis control and vigilance programs for determining the real situation of schistosomiasis in low endemic areas.
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Affiliation(s)
- H Y Kanamura
- Faculdade de Ciências Farmacêuticas, Universidade de S. Paulo, Brazil.
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12
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Abstract
Despite the success of control programmes, schistosomiasis is still a serious public health problem in the world. More than 70 countries where 200 million individuals are evaluated to be infected of a total 600 million at risk. Though there have been important local success in the control of transmission, globally the infection has increased. Economic constrains in developing countries, environmental changes associated with migration and water resources development have been blocking the progress. The main objective of schistosomiasis control is to achieve reduction of disease due to schistosomiasis. We discussed the control measures like: health education, diagnosis and chemotherapy, safe water supplies, sanitation and snail control. We emphasized the need to give priority to school-age children and the importance of integrating the measures of control into locally available systems of health care. The control of schistosomiasis is directly related to the capacity of the preventive health services of an endemic country. The strategy of control requires long-term commitment from the international to the local level.
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Affiliation(s)
- L C Dias
- Departamento de Parasitologia, Universidade Estadual de Campinas, SP, Brasil
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Pica-Mattoccia L, Dias LC, Cioli D. Genetic complementation analysis of two independently isolated hycanthone-resistant strains of Schistosoma mansoni. Mem Inst Oswaldo Cruz 1994; 87 Suppl 4:211-4. [PMID: 1343897 DOI: 10.1590/s0074-02761992000800032] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The objective of this study is to determine whether various hycanthone resistant strains of schistosomes which have been independently isolated are all affected in the same gene. A strain obtained from a Brazilian patient was compared with a strain of Puerto Rican origin selected in the laboratory. If the mutation conferring resistance involved two different genes, one would expect that progeny of a cross between the two strains would show complementation, i.e. it would be sensitive to the drug. We have performed such a cross and obtained F1 hybrid worms which were essentially all resistant, thus suggesting that the mutation conferring resistance in the two strains involves the same gene.
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Dias LC, Glasser CM, Marçal O, Bonesso PI. [Epidemiology of schistosomiasis mansoni in a low endemic area]. CAD SAUDE PUBLICA 1994; 10 Suppl 2:254-60. [PMID: 15042215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023] Open
Abstract
We discuss the epidemiological patterns of schistosomiasis mansoni in areas with low transmission in Brazil. We define as areas of low endemicity those where the prevalence is less than 10%, the number Schistosoma mansoni eggs per gram of feces (epg) is less than 96, and carriers are asymptomatic. Data are from the county of Pedro de Toledo in the Ribeira Valley (São Paulo State) and were collected randomly according to the aggregate pattern of S. mansoni within the hosts. We suggest the replacement of parasitological methods by more sensitive and specific serological techniques. The main risk factor for infection is type of leisure activity. Infection is more frequent in the 10-14, 15-19, and 20-24-year age brackets. Geometric mean epg is 58.5. Intensity of infections correlates well (rs = 0.745) with prevalence. The highest index of potential contamination is in the 5-20-year age bracket (57.6%). Autochthonous cases show close association with Biomphalaria tenagophila, which has a low infection rate (2%). Prevalence, incidence, and intensity of infection patterns are similar to those of moderate and high endemic areas. Social and cultural aspects must be studied in order to obtain a global epidemiological view of schistosomiasis.
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Affiliation(s)
- L C Dias
- Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP, 13083-970, Brasil
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15
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Pica-Mattoccia L, Dias LC, Moroni R, Cioli D. Schistosoma mansoni: genetic complementation analysis shows that two independent hycanthone/oxamniquine-resistant strains are mutated in the same gene. Exp Parasitol 1993; 77:445-9. [PMID: 8253157 DOI: 10.1006/expr.1993.1104] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Two drug-resistant strains of Schistosoma mansoni were compared in this study in order to decide whether they are both mutated in the same gene with respect to drug-sensitive schistosomes. One of the two strains was isolated in the laboratory, while the other one originated from a treated uncured patient and was subsequently drug selected in the laboratory. The approach consisted in a genetic complementation test performed essentially by crossing the two strains and assessing resistance in the progeny. Since no reappearance of drug sensitivity was detected in the progeny, it was concluded that the two strains failed to complement and were therefore mutated in the same gene. This finding suggests that a single step of drug activation operates in sensitive schistosomes and is ineffective in resistant worms.
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16
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Marçal Júnior O, Hotta LK, Patucci RM, Glasser CM, Dias LC. Schistosomiasis mansoni in an area of low transmission. II. Risk factors for infection. Rev Inst Med Trop Sao Paulo 1993; 35:331-5. [PMID: 8115792 DOI: 10.1590/s0036-46651993000400005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Risk factors for Schistosoma mansoni infection were identified using a 1:1 matched case-control design. The work was conducted in the municipality of Pedro de Toledo, São Paulo State, Brazil, an area where the snail host is Biomphalaria tenagophila. Information on water contact patterns, knowledge, attitudes and practices (kap), socioeconomic and sanitary conditions were obtained by mean of questionnaires. The crude odds ratio estimates and the adjusted odds ratio estimates using the logistic regression model are presented. Most of the examined individuals admitted recent water contacts (90.6% of the cases). The most frequent reason for contact was swimming, playing and fishing and the preferential site of contact was the river. According to the logistic regression technique, the main risk factors for infection were: a) water contact through swimming, playing and fishing; b) fording; c) bad hygiene. We concluded that recreational activities are the main reasons for schistosomiasis transmission in Pedro de Toledo and leisure alternatives should be offered to the local population.
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Affiliation(s)
- O Marçal Júnior
- Universidade Estadual de Campinas (UNICAMP), S. Paulo, Brasil
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17
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Drescher KM, Rogers EJ, Bruce JI, Katz N, Dias LC, Coles GC. Response of drug resistant isolates of Schistosoma mansoni to antischistosomal agents. Mem Inst Oswaldo Cruz 1993; 88:89-95. [PMID: 8246759 DOI: 10.1590/s0074-02761993000100014] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The susceptibility of four isolates of Schistosoma mansoni (BH, MAP, MPR-1 and K) to four multiple doses of anti-schistosomal agents (hycanthone, niridazole, oxamniquine, and praziquantel) were evaluated in infected female Swiss albino mice. These schistosomal isolates had been maintained in the laboratory without further drug pressure for 20 to 30 generations. Multiple dosage regimens were used for each drug against each isolate of S. mansoni to generate ED50 (effective dose 50%) values. Results demonstrated that the K isolate is resistant to niridazole, the MPR-1 isolate to oxamniquine, and the MAP isolate to both hycanthone and oxamniquine. The BH isolate was susceptible to all drugs and was used as the reference isolate. All isolates were susceptible to parziquantel. The significance of the difference in response of the MPR-1 and MAP isolates is discussed. These results confirm the resistance of these isolates of S. mansoni to three schistosomicides and demonstrate that the resistance of these isolates are stable over long periods of time without exposure to drugs.
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Affiliation(s)
- K M Drescher
- Center for Tropical Diseases, University of Massachusetts at Lowell 01854
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Figueiredo AC, Dias LC, Marques EH. Biological and morphological characteristics of Schistosoma mansoni from Ribeira Valley, state of São Paulo, Brazil I--Susceptibility of Biomphalaria tenagophila snail to sympatric S. mansoni strain. Rev Inst Med Trop Sao Paulo 1992; 34:199-203. [PMID: 1342070 DOI: 10.1590/s0036-46651992000300003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
In the São Paulo State, Brazil, where the Biomphalaria tenagophila is the intermediate host, the Ribeira Valley is an important endemic schistosomiasis mansoni area. During last eleven years there has been intense control measures focusing on schistosomiasis. The efforts have been concentrated in the municipalities of Pedro de Toledo and Itariri. We determined the susceptibility of B. tenagophila to sympatric strain of S. mansoni, both recently isolated from Itariri field. In 1988, this strain was isolated and maintained in the experimental model: Swiss mice--sympatric B. tenagophila. The second generation of the worm was evaluated. The snail were divided in the three groups of 60 snails each. One group was exposed to 1 miracidium and other to 10. The third group was the control. The mortality and the shedding of cercariae were checked during 78 days. After that, the positive snails were observed until they ceased to shed cercariae. The exposed molluscs showed mortality rates of 23% and 31% and infection indexes were of 8% and 60% to 1 and 10 miracidia respectively. The mortality was of 22% in the control group. The periods of shedding cercariae in the two groups were 82 and 104 days. We can conclude that B. tenagophila is an effective intermediate host to the sympatric strain of S. mansoni sympatric strain.
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Abstract
The schistosomiasis is transmitted by Biomphalaria tenagophila in our study area (Pedro de Toledo, São Paulo, Brazil). From 1980 to 1990 epidemiological surveys in a population of 4,000 inhabitants, has shown that: prevalences by Kato-Katz (KKT), immunofluorescence (FT) and intradermal (IDT) techniques were 22.8%, 55.5% and 51.8%, respectively; intensity of infection was low, 58.5 eggs per gram of faeces (epg); there were no symptomatic cases; prevalences were higher in mates, children and rural zone; index of potential contamination was 57.5% in the age group 5 to 20 years; 2/3 of patients were autochthonous; cases were no-randomly aggregated; transmission was focal and only 0.4% of snails were infected; water contacts through recreation showed the most important odds ratio; knowledge, attitudes and practices were satisfactory. From the epidemiological findings a control programme was carried out: yearly faeces exams, chemotherapy, molluscocide, health education and sanitation. Thus, the prevalence decreased sharply to 3.3% and intensity of infection to 30.3 epg; the incidence rates ranged between 0.4% and 2.5% annually; the sanitation became better and the youngsters were the main target in prophylaxis. To improve control, immunodiagnosis has to be conducted and the involvement of the population should be increase. However, we cannot forget that re-infection, therapeutic failure, etc, could play a major role in the maintenance this residual prevalence.
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Affiliation(s)
- L C Dias
- Instituto de Biologia, Universidade Estadual de Campinas, SP, Brasil
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Abstract
In population surveys in which the Schistosoma mansoni intensity of infection is low, or in localities where the schistosomiasis control program had success, the parasitologic methods lack in sensitivity. Despite of some limitations, the immunological methods are useful to provide valuable information in such field conditions. Thus, the prevalence of schistosomiasis in untreated population can be determined by the detection of IgG or IgM antibodies, as well as the incidence by the IgA antibodies, employing mainly immunofluorescence (IF) and immunoenzymatic (ELISA), and in some extent hemagglutination (HA) or even skin test. The true prevalence and incidence of schistosomiasis can be estimated using a probabilistic model equation, since knowing before-hand the sensitivity and specificity of employed test. The sensitivity and the specificity of serologic test become higher in low aged group, under 14. The geometric mean IF titers also gives a positive correlation with the intensity of infection. Presently, there are need of serologic tests which are economic and practical in seroepidemiologic inquiries, requiring no specialized personnel to collect population blood or serum samples, and also easily interpret the test results. The reagents for such tests are desired to be stable and reproducible. Moreover, it is expected that the tests can distinguish an active infection.
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Marçal Júnior O, Patucci RM, Dias LC, Hotta LK, Etzel A. Schistosomiasis mansoni in an area of low transmission. I. Impact of control measures. Rev Inst Med Trop Sao Paulo 1991; 33:83-90. [PMID: 1844388 DOI: 10.1590/s0036-46651991000200001] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
This work was undertaken in the municipality of Pedro de Toledo (São Paulo State, Brazil) in 1987, to clarify aspects related to the transmission levels of Schistosoma mansoni in a human population where the snail host is Biomphalaria tenagophila. Since 1980 a control programme has been undertaken in this municipality. Urban and rural populations (4,719 subjects) were submitted to faecal examinations (Kato-Katz method). The overall prevalence rate was 4.8% being higher in males (6.2%) and also in the rural zone (5.8%). The geometric mean of S. mansoni eggs was 35.1 eggs per gramme of faeces (epg). Approximately 80.0% of the carriers presented less than 100 epg and only 20 individuals (9.0%) eliminated more than half of total eggs. The highest index of potential contamination (IPC) was in the age group of 5 to 20 years (57.6%). Two thirds of the investigated patients (207) were autochthonous of Pedro de Toledo. The geographical distribution of the carriers showed a clear aggregation of the autochthonous cases and a close association between human contact sites and breeding places of B. tenagophila. This study shows that schistosomiasis subjects were not randomly aggregated, the youngsters should be the main target in the prophylaxis, and the efficacy of the control programme.
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Dias LC, Kawazoe U, Glasser C, Hoshino-Shimizu S, Kanamura HY, Cordeiro JA, Guarita OF, Ishihata GJ. Schistosomiasis mansoni in the municipality of Pedro de Toledo (São Paulo, Brazil) where the Biomphalaria tenagophila is the snail host. I--Prevalence in human population. Rev Inst Med Trop Sao Paulo 1989; 31:110-8. [PMID: 2513633 DOI: 10.1590/s0036-46651989000200009] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Due to the scarce information about the epidemiological features of schistosomiasis in which the vector is Biomphalaria tenagophila, an investigation was carried in Pedro de Toledo in 1980 where such peculiarity is observed. Stool examinations (Kato-Katz method) were performed in 4,741 individuals (22.8% positive to Schistosoma mansoni eggs) of this 583 had previously received chemotherapy and 4,158 remainders, untreated. The schistosomiasis prevalence in those two groups where respectively 31.7% and 21.6%. Epidemiological investigation showed that 83.6% were autochthonous cases from the studied area: the autochthonous prevalence rate, and the intensity of infection in the untreated autochthonous cases were higher in males than in females; the intensity in the latter untreated group was low, 58.5 eggs/g feces (geometric mean). Moreover, according to the age groups the intensity of infections correlated well (rs = 0.745) with the prevalence rates. Schistosomiasis was verified to occur mostly during the leisure time and by the use of water streams for housework in rural zone. Only 0.4% out of 1,137 snails was positive for S. mansoni cercariae, apparently unchanged from the 1978 study when the human prevalence was 12.0%. The studied area presented differences and similarities in relation to the other Brazilian areas were the main intermediate host is B. glabrata.
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Dias LC, Glasser CM, Etzel A, Kawazoe U, Hoshino-Shimizu S, Kanamura HY, Cordeiro JA, Marçal Júnior O, Carvalho JF, Gonçales Júnior FL. The epidemiology and control of schistosomiasis mansoni where Biomphalaria tenagophila is the snail host. Rev Saude Publica 1988; 22:462-3. [PMID: 3150615 DOI: 10.1590/s0034-89101988000500011] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The epidemiology and control of schistosomiasis mansoni in the Municipality of Pedro de Toledo (State of S. Paulo, Brazil) since 1980, has been studied. In 1980 the prevalence evaluated by stool exams (Kato-Katz method) was 22.8% and no statistical difference at 5.0% level was observed between rural and urban zones. The intensity of infection was low (58.5 eggs/g of faeces); the highest prevalence and intensity of infection rates were observed within the group of from 5 to 29 years of age, respectively. The transmission of schistosomiasis usually occurred during leisure time. The majority of the carriers of the parasite were asymptomatic. Of the B. tenagophila examined only 0.4% were found to be infected. The control programme has been intensified from 1981 on resulting in a sharp decrease in the prevalence from 22.8% in 1980 to 6% at the present time. This result shows that, in spite of the control programme there is a residual human prevalence. A beginning has been made on the investigation into the possible causes of this residual prevalence (6.0% was maintained through out 1987).
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Abstract
Five strains of Schistosoma mansoni resistant and susceptible to schistosomicides were studied for infectivity of 2 strains of Biomphalaria glabrata one of Puerto Rican origin and the other of Brazilian origin. Puerto Rican strains of S. Mansoni developed more slowly and had a lower infectivity in Brazilian B. glabrata than did the Brazilian S. mansoni. However, Brazilian S. Mansoni developed as well in Puerto Rican snails as in Brazilian snails, indicating that drug resistant strains could easily be moved by travel of infected persons from one area to another.
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Dias LC, Ueta MT, Guaraldo AM. [Susceptibility of Biomphalaria glabrata, B. straminea and B. tenagophila to various strains of Schistosoma mansoni]. Rev Inst Med Trop Sao Paulo 1987; 29:205-12. [PMID: 3130655 DOI: 10.1590/s0036-46651987000400004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Em condições experimentais foi estudada a suscetibilidade de Biomphalaria glabrata, B. straminea e B. tenagophila a quatro linhagens humanas (MAP, PTH, UPH, e OuH) e duas de roedores silvestres (PTR e VPR) do Schistosoma mansoni. Grupos de 50 moluscos foram expostos individualmente a 10 miracídios e observados durante 70 dias. Avaliou-se a suscetibilidade dos moluscos ao parasito por meio da % de animais com esporocistos, % de moluscos que eliminavam cercárias e mortalidade conjunta dos animais expostos e infectados. Exemplares de B. glabrata mineira infectaram-se com cepa simpátrica (MAP) e com 5 alopátricas do Estado de São Paulo (PTH, VPH, OuH, PTR e VPR). B. glabrata paulista mostrou altas taxas de infecção com as cepas MAP, VPR e OuH do trematódeo. Quatro % dos exemplares B. straminea de São Paulo eliminavam cercárias de cepas simpátricas; com cepa mineira apenas 4% apresentaram esporocistos na vigência de 20 miracídios por molusco; as menores taxas de mortalidade foram registradas com essa espécie de molusco, não sendo maior do que 20%. B. tenagophila paulista foi suscetível apenas às linhagens simpáticas sendo 6% a maior taxa de moluscos que eliminaram cercárias. Os resultados indicam que os movimentos populacionais humanos dentro do território paulista e para fora dele são importantes na disseminação da esquistossomose mansônica.
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Abstract
Drug resistance associated with the treatment of human schistosomiasis appears to be an emerging problem requiring more attention from the scientific community than the subject currently receives. Drug-resistant strains of Schistosoma mansoni have been isolated by various investigators as a result of laboratory experimentation or from a combination of field and laboratory studies. Review of this data appears to indicate that the lack of susceptibility observed for some of the isolated strains cannot be ascribed solely to previous administration of antischistosome drugs and thus further studies are required to elucidate this phenomena. Strains of S. mansoni have now been identified from Brazil which are resistant to oxamniquine, hycanthone and niridazole; from Puerto Rico which are resistant to hycanthone and oxamniquine; and from Kenya which are resistant to niridazole and probably oxamniquine. Strains derived by in vitro selection and resistant to oxamniquine and possibly to oltipraz are also available. All of these strains are currently maintained in the laboratory in snails and mice, thus providing for the first time an opportunity for indepth comparative studies. Preliminary data indicates that S. haematobium strains resistant to metrifonate may be occurring in Kenya. This problem could poise great difficulty in the eventual development of antischistosomal agents. Biomphalaria glabrata from Puerto Rico and Brazil were found to be susceptible to drug-resistant S. mansoni from each country.
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Affiliation(s)
- J I Bruce
- Center for Tropical Diseases, University of Lowell, Massachusetts 01854
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Dias LC, Olivier CE. Failure at inducing resistance to schistosomicidal drugs in a Brazilian human strain of Schistosoma mansoni. Rev Inst Med Trop Sao Paulo 1986; 28:352-7. [PMID: 3589395 DOI: 10.1590/s0036-46651986000500010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
No presente estudo, realizou-se uma tentativa de indução de resistência a 3 drogas esquistossomicidas em uma cepa brasileira de S. mansoni, segundo o esquema de indução de resistência tipo II preconizado por JANSMA et al. em 1977. Houve insucesso nas 3 tentativas realizadas. A geração parental tratada com a droga durante o estágio imaturo do verme mostrou-se menos suscetível aos quimioterápicos do que as gerações F1 e F2 do verme. Uma hipótese é levantada para a explicação do fato.
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Abstract
The susceptibility of the MAP Brazilian strain (F1 to F5 progenies) of S. mansoni to four antischistosomal drugs has been reported in a previous study. In the present investigation, progeny F14 of the same strain, was tested for stability to the same 4 drugs. A new medication, Oltipraz (35,972 RP), was added to the study. Five groups of 12 mice infected with cercariae by tail immersion were treated with hycanthone, oxamniquine, niridazole, praziquantel and Oltipraz. An untreated group was used as control. Schistosomal activity was assessed by the localization of worms in the portal vein system, by oogram changes, and percentage of parasite reduction. The stability of the susceptibility of progeny F14 did not change in relation to generations F1 to F5; the progeny was resistant to hycanthone and oxamniquine; but sensitive to niridazole, praziquantel and Oltipraz. We emphasize the importance of the phenomenon of resistance of the worm in view of the fact that oxamniquine has been widely used in Brazilian areas where mansonic schistosomiasis is endemic.
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Carreirão S, Correa WE, Dias LC, Pitanguy I. Treatment of abdominal wall eventrations associated with abdominoplasty techniques. Aesthetic Plast Surg 1984; 8:173-9. [PMID: 6240198 DOI: 10.1007/bf01597522] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
An experimental and clinical study using alloplastic materials (Marlex and Prolene mesh) for repairing large defects of the abdominal wall is reported. A defect was created in the experimental model to simulate an anatomical disarrangement of the musculo-aponeuroticfascial complex of the abdominal wall and the surgical correction of this deformity. Macroscopic and microscopic observations of the operated area were done to demonstrate the good integration of the surrounding tissues with the mesh. In a clinical study, 16 patients, presenting large eventrations of the abdominal wall, were surgically treated using Marlex or Prolene mesh to reinforce the abdominal wall. Two techniques of abdominoplasty, vertical and horizontal, were performed on these patients, according to the location of previous scars. The advantages of using alloplastic materials to reinforce the abdominal wall and the cosmetic results of both abdominoplasty techniques are discussed.
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Branchini ML, Pedro RDJ, Dias LC, Deberaldini ER. Double-blind clinical trial comparing praziquantel with oxamniquine in the treatment of patients with schistosomiasis mansoni. Rev Inst Med Trop Sao Paulo 1982; 24:315-21. [PMID: 6762635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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Rodrigues VL, Rocha e Silva EO, Teodoro U, Dias LC. [A new finding on Trypanosoma (Herpetosoma) forattinii Coutinho et Pattoli 1964 in the State of São Paulo, Brazil]. Rev Bras Biol 1982; 42:171-5. [PMID: 6753050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Dias LC. [Soil-transmitted helminths in Brazil (author's transl)]. Bol Chil Parasitol 1981; 36:27-8. [PMID: 7344711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Dias LC, Piedrabuena AE. Morphological aspects of Schistosoma mansoni in naturally infected Holochilus brasiliensis leucogaster. Trans R Soc Trop Med Hyg 1980; 74:690. [PMID: 7210119 DOI: 10.1016/0035-9203(80)90173-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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Pedro RD, Dias LC, Amato Neto V, De Carvalho SA. Observations on the treatment of mansoni schistosomiasis with oxamniquine. Rev Bras Pesqui Med Biol 1979; 12:207-11. [PMID: 515473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Guimarães RX, Tchakerian A, Dias LC, de Almeida FM, Vilela MP, Cabeca M, Takeda AK. [Resistance to hycanthone and oxamniquine in patients with a clinical hepato-intestinal form of schistosomiasis]. AMB Rev Assoc Med Bras 1979; 25:48-50. [PMID: 314642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Dias LC, Pedro RJ, Rigo E, Goto MM, Mafra GL. [A human strain of Schistosoma mansoni resistant to schistosomicides]. Rev Saude Publica 1978; 12:110. [PMID: 675134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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Dias LC, Avila-Pires FD, Pinto AC. Parasitological and ecological aspects of Schistosomiasis mansoni in the valley of the Paraíba do Sul River (São Paulo State, Brazil) I. Natural infection of small mammals with Schistosoma mansoni. Trans R Soc Trop Med Hyg 1978; 72:496-500. [PMID: 725994 DOI: 10.1016/0035-9203(78)90169-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Small mammals naturally infected with Schistosoma mansoni were studied in the valley of the Paraíba do Sul river (São Paulo State, Brazil). 192 animals of 12 species were examined post mortem. Cavia aperea, Holochilus brasiliensis leucogaster, Nectomys squamipes squamipes, Oryzomys nigripes eliurus and Zygodontomys brachyurus were found infected. Most schistosome eggs found in the faeces were mature but no eggs were found in the faeces of C. aperea although adults were recovered. In the other infected animals the number of eggs per gram of faeces showed a marked daily variation. Perfusion of the portal system demonstrated that in H. b. leucogaster worms usually remained in the mesenteric veins. In C. aperea 75.7% of worms were found in the portal and intra-hepatic veins. H. b. leucogaster seems to be the rodent most likely to play a role in the epidemiology of schistosomiasis mansoni in the valley of the Paraíba do Sul river.
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Magalhães LA, Dias LC. [Study of the susceptibility of Biomphalaria glabrata from Ourinhos (São Paulo), to Schistosoma mansoni from Belo Horizonte (Minas Gerais) and São José dos Campos (São Paulo)]. Rev Saude Publica 1973; 7:295-7. [PMID: 4789392 DOI: 10.1590/s0034-89101973000300011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Foi estudada a suscetibilidade da Biomphalaria glabrata de um foco de Schistosoma mansoni no município de Ourinhos, (SP, Brasil). Concluiu-se pela alta capacidade desses moluscos à infecção pelas cepas de S. mansoni de Belo Horizonte, Minas Gerais e de São José dos Campos, São Paulo.
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Magalh aes LA, Dias LC, Piza JT, Takaku L, Pereira AA. [Epidemiological aspects of schistosomiasis mansoni in the Americana reservoir area, State of S ao Paulo, Brazil]. Rev Saude Publica 1973; 7:21-8. [PMID: 4725262 DOI: 10.1590/s0034-89101973000100002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Após conhecimento de casos humanos de esquistossomose mansônica supostamente autóctones da Represa de Americana (São Paulo, Brasil) procedeu-se ao estudo epidemiológico da região. Foram constatados seis focos localizados junto à Represa. Foram encontradas as seguintes espécies de moluscos: Biomphalaria tenagophila; B. straminea; B. peregrina; Drepanotrema cimex; D. lucidum; |Lymnaeidae; Ancylidae e Physidae. Exemplares de Biomphalaria tenagophila coletados nos focos apresentaram índices de infecção para cercárias de S. mansoni que variaram de 0,9 a 45%. Mus musculus albinos foram infectados com cercárias no laboratório e nos focos, sendo reproduzido o ciclo do S. mansoni em ambas as condições. Foram registrados 82 casos humanos autóctones de esquistossomose mansônica, na região da Represa de Americana.
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Corrêa RDR, Murgel JM, Piza JDT, Ramos ADS, Dias LC, Morais LV, do Rosário FF. [The spreading of Biomphalaria steaminea, intermediate host of Schistosoma mansoni, through the distribution of fishes]. Rev Saude Publica 1970; 4:117-27. [PMID: 5533752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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Fróes E, Piza JDT, Dias LC, Pinto AC. [Epidemiologic and preventive aspects of schistosomiasis Mansoni in San Jose de Campos]. Hospital (Rio J) 1970; 77:1587-98. [PMID: 5311597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Dias LC, de São Paulo MDC, de Carvalho HT. [Nursing studies of tetanus]. Rev Bras Enferm 1970; 22:49-63. [PMID: 5202329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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