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1.
BMC Public Health ; 19(1): 1393, 2019 Oct 28.
Artigo em Inglês | MEDLINE | ID: mdl-31660918

RESUMO

BACKGROUND: Limited research has been conducted on the effectiveness of sexuality education for very young adolescents (VYAs) ages 10-14 years in Sub-Saharan Africa. Furthermore, evaluations of sexuality education programs often report outcomes of risky sexual practices, yet positive aspects of sexuality are hardly studied and rarely reported. This study evaluates the effectiveness of a Comprehensive Sexuality Education (CSE) intervention for VYAs in Uganda, analyzing both positive and negative outcome indicators. METHODS: We conducted a mixed methods study, incorporating a cluster randomized trial (NCT03669913) among pupils in 33 randomly selected primary schools in Mbarara district. This was followed by a qualitative evaluation of the intervention in 4 schools that included 14 in-depth interviews and 3 focus group discussions distributed among pupils, teachers and parents. Quantitative data were analyzed using ordered logistic regression to compare differences in the change from baseline to endline between the intervention and control arms. We conducted bivariate analysis and multiple regression analysis controlling for key covariates, including age, gender, school location (rural vs urban), truancy, and orphanhood. Qualitative data were analyzed by thematic approach using ATLAS TI. RESULTS: Between July 2016 and August 2017, 1096 pupils were recruited. Outcomes were studied among 380 pupils in the intervention arm and 484 pupils in the control arm. The proportion of pupils who ever had sex increased from 9 to 12.1% in intervention compared to 5.2 to 7.4% in the control group between baseline and endline, however the differences between groups were not statistically significant. We found greater improvements in sexual and reproductive health (SRH) knowledge among intervention schools (AOR: 2.18, 95% CI: 1.66-2.86) and no significant differences in self-esteem, body image or gender equitable norms. Qualitative evidence echoes perceived SRH knowledge acquisition, increased their perception of SRH related risks, and intentions to delay sexual intercourse to prevent unwanted pregnancy, HIV and other STIs. CONCLUSION: This study demonstrates that CSE can improve SRH knowledge and behavioral intentions among VYAs in Uganda. These results further emphasize the importance of initiating sexuality education before most adolescents have started engaging in sexual activity, enabling them to make informed decisions in the future. TRIAL REGISTRATION: NCT03669913 , registered retrospectively on September 13th, 2018.


Assuntos
Conhecimentos, Atitudes e Prática em Saúde , População Rural , Serviços de Saúde Escolar , Educação Sexual , Estudantes/psicologia , Adolescente , Criança , Feminino , Humanos , Masculino , Gravidez , Avaliação de Programas e Projetos de Saúde , População Rural/estatística & dados numéricos , Estudantes/estatística & dados numéricos , Uganda
2.
Sex Reprod Healthc ; 21: 51-59, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31395234

RESUMO

BACKGROUND: We present findings of a process evaluation of a Comprehensive Sexuality Education (CSE) program for young adolescents in 15 schools in South-Western Uganda. METHODS: Using the Medical Research Council (UK) framework for process evaluation and the European Expert Group guidance on evaluation of sexuality education programs, we conducted a mixed methods study comprised of a review of relevant implementation documents, qualitative interviews(16), and focus group discussions(4) distributed among 50 participants including pupils, teachers, student educators and parents. RESULTS: Delivery of the anticipated 11 CSE lessons occurred in all target schools with moderate to high pupil attendance, however the duration of sessions was often shorter than planned. Facilitating factors for implementation included establishment of a community advisory board, use of multiple interactive delivery methods and high acceptance of the program by key stakeholders. Socio-cultural norms, geographical access, time constraints and school related factors were barriers. CONCLUSIONS: It was feasible to implement a contextually adapted CSE program for young adolescents in schools successfully with overall high acceptance by key stakeholders. Proper coordination of school activities with the program, ensuring linkages of the school based CSE program with community support systems for adolescent SRH and addressing socio-cultural impedances could be beneficial.


Assuntos
Desenvolvimento de Programas/normas , Avaliação de Programas e Projetos de Saúde , Educação Sexual/normas , Adolescente , Comunicação , Docentes , Feminino , Grupos Focais , Humanos , Entrevistas como Assunto , Idioma , Masculino , Pais , Política , Ensaios Clínicos Controlados Aleatórios como Assunto , Instituições Acadêmicas , Educação Sexual/métodos , Estudantes , Uganda
3.
Parasitol Res ; 118(2): 583-598, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30547247

RESUMO

Differentiating the Eimeria species causing cecal coccidiosis in turkeys is challenging. To obtain benchmark biological data for Eimeria gallopavonis Hawkins 1952 and Eimeria meleagridis Tyzzer 1929 and to support the stability of the species concept for each, genetically typed, single oocyst-derived lines of E. gallopavonis Weybridge strain and E. meleagridis USAR97-01 were used to redescribe the biological, pathological, and morphological features of these parasites. Oocysts of E. meleagridis and E. gallopavonis overlap in dimensions, but oocysts of the former have a single polar granule compared with multiple in the latter. Mature first-generation meronts of E. gallopavonis were observed histologically as early as 48 h post-inoculation alongside the villi in jejunum (before and after Meckel's diverticulum), ileum, cecal neck and rectum, but not cecal pouches. Three asexual cycles were observed suggesting that early workers apparently overlooked one asexual cycle. Examination of endogenous development of a culture labeled "Eimeria adenoeides Weybridge strain" suggested that this strain (found in a number of publications as a large oocyst strain of "Eimeria adenoeides") matched the species description of E. gallopavonis and so has been renamed herein. Macroscopic lesions induced by E. gallopavonis consisted of caseous material distally from posterior of the yolk stalk through the remaining intestinal tract, excluding the cecal pouches. For E. meleagridis, only the first asexual generation was observed outside of the cecal pouches within the jejunum around the yolk stalk. Second- and 3rd-generation asexual stages developed almost exclusively in the cecal pouches (but not cecal necks). Macroscopic lesions described for E. meleagridis were similar to those of E. adenoeides. Marked corrugation of the cecal serosal surface was observed. Cecal pouches contained creamy colored, caseous material varying from loose material to granular. Distinguishing features of the Eimeria species infecting the lower part of the small intestine are summarized in the present study, and new type specimens were designated for E. gallopavonis and E. meleagridis to provide a stable reference for future work with these parasites.


Assuntos
Coccidiose/veterinária , Eimeria/classificação , Eimeria/fisiologia , Intestinos/parasitologia , Doenças das Aves Domésticas/parasitologia , Animais , Coccidiose/parasitologia , Eimeria/genética , Mucosa Intestinal/parasitologia , Oocistos/genética , Oocistos/isolamento & purificação , Especificidade da Espécie , Perus/parasitologia
4.
Parasitol Res ; 116(10): 2661-2670, 2017 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-28785846

RESUMO

The Briston strain of Eimeria dispersa Tyzzer, 1929 was isolated originally from a commercial turkey flock from Briston, Norfolk, UK. A single oocyst-derived line of E. dispersa was propagated and used to re-describe biological and morphological features of E. dispersa in the turkey. Oocysts of the Briston strain measured 26 ± 1.1 µm (24-28) by 21 ± 1 µm (19-23); these were larger than oocysts described originally by Tyzzer in 1929 (22.75 by 18.84 µm) but within dimensions (26.07 by 21.04 µm) reported by Hawkins (1952) in his description of E. dispersa isolated from turkeys. In the present study, endogenous development started mainly in duodenum and upper jejunum and then spread down toward the lower jejunum. A few parasites were detected in the ileum beginning 96 h post-infection; only few gamonts were observed in the cecal neck area at 120 h, and no parasites were detected in cecal pouches or rectum. Four asexual generations were observed before the start of gametogony, and only one large type of first generation meront was detected in duodenum and upper jejunum at 32 h. This strain has a prepatent period of 120 h. The Briston strain of E. dispersa is a mildly pathogenic coccidium. Duodenum and jejunum of infected birds were slightly dilated and paler in color than of uninfected controls. There was whitish green mucoid material in the lumen of the duodenum and jejunum. The mucosa looked slightly congested and edematous with a few scattered petechial hemorrhages.


Assuntos
Coccidiose/veterinária , Eimeria/classificação , Doenças das Aves Domésticas/parasitologia , Perus/parasitologia , Animais , Ceco/parasitologia , Coccidiose/parasitologia , Duodeno/parasitologia , Eimeria/crescimento & desenvolvimento , Eimeria/isolamento & purificação , Íleo/parasitologia , Jejuno/parasitologia , Oocistos
5.
Poult Sci ; 94(2): 262-72, 2015 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-25609693

RESUMO

Unlike with Eimeria species infecting chickens, specific identification and nomenclature of Eimeria species infecting turkeys is complicated, and in the absence of molecular data, imprecise. In an attempt to reconcile contradictory data reported on oocyst morphometrics and biological descriptions of various Eimeria species infecting turkey, we established single oocyst derived lines of 5 important Eimeria species infecting turkeys, Eimeria meleagrimitis (USMN08-01 strain), Eimeria adenoeides (Guelph strain), Eimeria gallopavonis (Weybridge strain), Eimeria meleagridis (USAR97-01 strain), and Eimeria dispersa (Briston strain). Short portions (514 bp) of mitochondrial cytochrome c oxidase subunit I gene (mt COI) from each were amplified and sequenced. Comparison of these sequences showed sufficient species-specific sequence variation to recommend these short mt COI sequences as species-specific markers. Uniformity of oocyst features (dimensions and oocyst structure) of each pure line was observed. Additional morphological features of the oocysts of these species are described as useful for the microscopic differentiation of these Eimeria species. Combined molecular and morphometric data on these single species lines compared with the original species descriptions and more recent data have helped to clarify some confusing, and sometimes conflicting, features associated with these Eimeria spp. For example, these new data suggest that the KCH and KR strains of E. adenoeides reported previously represent 2 distinct species, E. adenoeides and E. meleagridis, respectively. Likewise, analysis of the Weybridge strain of E. adenoeides, which has long been used as a reference strain in various studies conducted on the pathogenicity of E. adenoeides, indicates that this coccidium is actually a strain of E. gallopavonis. We highly recommend mt COI sequence-based genotyping be incorporated into all studies using Eimeria spp. of turkeys to confirm species identifications and so that any resulting data can be associated correctly with a single named Eimeria species.


Assuntos
Coccidiose/veterinária , Eimeria/genética , Doenças das Aves Domésticas/parasitologia , Perus , Animais , Coccidiose/parasitologia , Eimeria/classificação , Genótipo , Filogenia , Especificidade da Espécie
6.
Parasitol Res ; 113(11): 3993-4004, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-25127734

RESUMO

The Guelph strain of Eimeria adenoeides was obtained from a commercial turkey flock in Ontario, Canada, in 1985. Single oocyst derived lines of E. adenoeides were propagated, and one of them used to re-describe biological and morphological features of E. adenoeides in the turkey. Oocysts of this strain are within the lower size ranges in the original species description reported by Moore and Brown (1951); oocysts of the Guelph strain averaged 18.7 ± 1.4 µm (16.7-22.5) by 14.3 ± 0.9 µm (13-16.2, n = 30) with a shape index (SI) of 1.3 ± 0.1. It is possible that the original species description was based, at least in part, on a mixed culture of two or more Eimeria species. Immature first-generation meronts of E. adenoeides Guelph strain were observed histologically at 32 h post-infection in the ileum and cecal neck. Early studies reported only two asexual generations suggested that first asexual cycle observed at 32 h post-infection was overlooked. In the present study, three asexual generations were observed before the start of gametogony. The Guelph strain is also characterized by a prepatent period of 112 h. The Guelph strain of E. adenoeides is a highly pathogenic coccidium that forms classic cecal lesions, including prominent caseous cecal cores, during moderate to severe infections. The maximum output of oocysts (1.77 × 10(7) per bird) was obtained from birds inoculated with 1 × 10(3) oocysts; maximum fecundity (1.55 × 10(5) oocyst shed per oocyst inoculated) was obtained with an inoculation of 1 × 10(2) oocysts, but fecundity dropped dramatically as the inoculation dose increased. To promote stability of the E. adenoeides species concept, neotype specimens (a parahapantotype slides series and phototype) have been designated and deposited for future reference.


Assuntos
Coccidiose/veterinária , Eimeria/classificação , Eimeria/crescimento & desenvolvimento , Perus/parasitologia , Animais , Ceco/patologia , Íleo/patologia , Ontário , Oocistos , Doenças das Aves Domésticas/parasitologia
7.
Nefrologia ; 29(3): 256-62, 2009.
Artigo em Espanhol | MEDLINE | ID: mdl-19554060

RESUMO

INTRODUCTION: In last time it was tried to homogenize the clinical activity and to make the decisions easier. In the field of Nephrology, the Spanish Society of Nephrology has developed different guidelines that have managed an improvement in patient s monitoring. That is the reason why the Quality Working Group in Nephrology was created, whose basic working field was haemodialysis, although its collaboration with an expert group in peritoneal dialysis (PD) has allowed the developement of a Scientific Technical Quality Programme and Constant Quality Improvement in PD. MATERIAL AND METHODS: We checked the clinical histories of all the patients in PD in the course of 2008 in the Peritoneal Dialysis Unit at our institution and we evaluated all the quality indicators that were described in the Scientific Technical Quality Programme and of Constant Quality Improvement in PD. RESULTS: During 2008 a total of 41 patients were treated in the Peritoneal Dialysis Unit at our institution, 43.9% women. Incidence was 14 (51.8%) and 21.4% were diabetics. No patients cames from transplant unit and 2 came from haemodilalysis unit (7.1%). Mean age in incident population was 60 +/- 13 years and in prevalent population was 53.9 +/- 14.4 years. Mean follow-up in PD was 25.9 +/- 19.9 months. Modified Charlson comorbility index average in incident patients was 6 and in prevalent patients was 5. 70.7% were included in transplant programme and 3 were transplanted in the year s course (10.3%). There were 19 hospital admissions (rate: 0.46 admission per patient/year in risk) with a mean stay of 7.3 days (rate: 3.4 days per patient/year in risk). During 2008 6 patients leaved PD (2 transfers to haemodialysis, 3 transplants and 1 death). 16 infective peritonitis (overall rate: 1 episode every 24 months) and 23 exit side infections were reported (rate: 1 episode every 18 months). Mean Kt/V was 2,4 +/- 0.06 (92.7% of patients achieved the stablished standards). All non-anuric patients had measured residual renal function and only 1 patient did not achieve the goal of fluid output > 1000 ml/day. No patient used 3.86-4.25% bags. Stablished standards were achieve by analitic indicators with regard to epoetin resistence index, LDL- cholesterol, phosphate, calcium-phosphate product and PTH. CONCLUSIONS: The application of the Scientific Technical Quality Programme and of Constant Quality Improvement in PD has made possible to know the current situation of our unit and to raise some matters when it is necessary to insist to get a better quality in our assistance.


Assuntos
Diálise Peritoneal/normas , Controle de Qualidade , Indicadores de Qualidade em Assistência à Saúde , Feminino , Humanos , Masculino , Pessoa de Meia-Idade
8.
Nefrología (Madr.) ; 29(3): 256-262, mayo-jun. 2009. ilus, tab
Artigo em Espanhol | IBECS | ID: ibc-104396

RESUMO

Introducción: en los últimos años se ha intentado homogeneizar la actividad clínica y facilitar la toma de decisiones. En el campo de la Nefrología, la SEN ha elaborado diferentes guías de práctica clínica que han conseguido una mejora de la monitorización de los pacientes. Por ello, se ha creado un grupo de trabajo sobre Gestión de la Calidad en Nefrología cuyo ámbito fundamental ha sido la hemodiálisis, aunque su colaboración con un grupo de expertos de Diálisis Peritoneal (DP) ha permitido la elaboración del Plan de Calidad Científico-técnica y de Mejora Continua de Calidad en DP. El objetivo de nuestro trabajo fue evaluar la situación de la Unidad de DP de nuestro centro respecto a dicho plan de calidad valorando cada uno de los indicadores propuestos y compararlos con los estándares recomendados. Material y métodos: revisamos las historias clínicas de todos los pacientes que realizaron DP durante el año 2008 en nuestra Unidad, valorando todos los indicadores de calidad descritos en el Plan de Calidad Científico-técnica y de Mejora Continua de Calidad en DP. Resultados: durante el año 2008, 41 pacientes realizaron DP en nuestro centro; el 43,9% eran mujeres, con una incidencia de 14 (51,8%), y el 21,4% eran diabéticos. Ningún paciente procedía de trasplante y 2 de HD (7,1%). La edad media de la población incidente fue de 60 ± 13 años, y la de la prevalente fue de 53,9 ± 14,4 años, con tiempo medio en DP de 25,9 ± 19,9 meses. La mediana del índice de comorbilidad de Charlson modificado en incidentes fue 6 y en prevalentes 5. El 70,7% estaba incluido en programa de trasplante y se trasplantaron 3 (10,3%). Hubo 19 ingresos (0,46 por paciente/año en riesgo), con estancia media de 7,3 días (3,4 días por paciente/año en riesgo). A lo largo del año abandonaron el tratamiento 6 pacientes (2 transferencias a HD, 3 trasplantes y 1 exitus). Hubo 16 peritonitis (1 episodio cada 24 meses-paciente) y 23 infecciones del OS (1 episodio cada 18 meses-paciente). El Kt/V medio fue de 2,4 ± 0,06, con el 92,7% dentro del objetivo. El 100% de los pacientes no anúricos tenían medida FRR; sólo 1 paciente no alcanzaba el objetivo de eliminación de líquido >1.000 ml/día; en ningún caso se utilizaban bolsas de 3,86-4,25%. Se alcanzaron los estándares de los indicadores analíticos en lo que respecta a índice de resistencia a eritropoyetina, LDL-colesterol, fósforo, producto calcio-fósforo y PTH intacta. Conclusiones: la aplicación del Plan de Calidad Científico-técnica y de Mejora Continua de Calidad en Diálisis Peritoneal nos ha permitido conocer la situación actual de nuestra Unidad y plantearnos aquellas cuestiones en las que es preciso incidir para conseguir una mejor calidad en la asistencia que prestamos (AU)


Introduction: In last time it was tried to homogenize the clinical activity and to make the decisions easier. In the field of Nephrology, the Spanish Society of Nephrology has developed different guidelines that have managed an improvement in patient´s monitoring. That is the reason why the Quality Working Group in Nephrology was created, whose basic working field was haemodialysis, although its collaboration with an expert group in peritoneal dialysis (PD) has allowed the developement of a Scientific Technical Quality Programme and Constant Quality Improvement in PD. Material and methods:We checked the clinical histories of all the patients in PD in the course of 2008 in the Peritoneal Dialysis Unit at our institution and we evaluated all the quality indicators that were described in the Scientific Technical Quality Programme and of Constant Quality Improvement in PD. Results: During 2008 a total of 41 patients were treated in the Peritoneal Dialysis Unit at our institution, 43.9% women. Incidence was 14 (51.8%) and 21.4% were diabetics. No patients cames from transplant unit and 2 came from haemodilalysis unit (7.1%). Mean age in incident population was 60 ± 13 years and in prevalent population was 53.9 ± 14.4 years. Mean follow-up in PD was 25.9 ± 19.9 months. Modified Charlson comorbility index average in incident patients was 6 and in prevalent patients was 5. 70.7% were included in transplant programme and 3 were transplanted in the year´s course (10.3%). There were 19 hospital admissions (rate: 0.46 admission per patient/year in risk) with a mean stay of 7.3 days (rate: 3.4 days per patient/year in risk). During 2008 6 patients leaved PD (2 transfers to haemodialysis, 3 transplants and 1 death). 16 infective peritonitis (overall rate:1 episode every 24 months) and 23 exit side infections were reported (rate: 1 episode every 18 months). Mean Kt/V was 2,4 ± 0.06 (92.7% of patients achieved the stablished standards). All non-anuric patients had measured residual renal function and only 1 patient did not achieve the goal of fluid output > 1000 ml/day. No patient used 3.86-4.25% bags. Stablished standards were achieve by analitic indicators with regard to epoetin resistence index, LDL- cholesterol, phosphate, calcium-phosphate product and PTH.Conclusions: The application of the Scientific Technical Quality Programme and of Constant Quality Improvement in PD has made possible to know the current situation of our unit and to raise some matters when it is necessary to insist to get a better quality in our assistance (AU)


Assuntos
Humanos , Diálise Peritoneal/métodos , Unidades Hospitalares de Hemodiálise/organização & administração , Melhoria de Qualidade/organização & administração , Insuficiência Renal Crônica/epidemiologia , Diálise Renal , Indicadores de Qualidade em Assistência à Saúde , Comorbidade , Fatores de Risco
11.
Artigo em Inglês | MEDLINE | ID: mdl-13129795

RESUMO

OBJECTIVE: To compare characteristics of ALS patients with and without percutaneous endoscopic gastrostomy (PEG). METHODS: Using the ALS Patient Care Database, data from patients with and without PEG with ALS Functional Rating Scale-bulbar subscale (ALSFRSb) scores < or = 5 were analyzed; follow-up data were also collected. RESULTS: PEG use was markedly increased with declining ALSFRSb scores. Demographics did not differ, but ALSFRS composite scores and bulbar and arm subscale scores were lower (P<0.0001). PEG patients used significantly more assistive devices, multidisciplinary care, home care nurses and aides, had more frequent physician and emergency department visits and hospital admissions (P<0.0001), and had lower health status based on the mini-SIP scale (P=0.0047). PEG use varied greatly between ALS centers. In the follow-up study, positive impact of PEG was noted in 79 % of PEG patients but in only 37.5% of patients who received PEG later, based on a small number of patients. PEG use showed no survival benefit. CONCLUSION: Patients did not receive PEG until bulbar function was severely reduced and overall ALS had markedly progressed. PEG may have been performed too late to demonstrate survival benefits. Aggressive proactive nutritional management appears essential in patients with ALS. To determine whether PEG provides benefits, it must be performed at earlier stages of the disease and prospectively studied.


Assuntos
Esclerose Lateral Amiotrófica/terapia , Paralisia Bulbar Progressiva/terapia , Endoscopia/métodos , Gastrostomia/métodos , Esclerose Lateral Amiotrófica/complicações , Esclerose Lateral Amiotrófica/epidemiologia , Paralisia Bulbar Progressiva/complicações , Paralisia Bulbar Progressiva/epidemiologia , Bases de Dados como Assunto , Avaliação da Deficiência , Nutrição Enteral , Feminino , Seguimentos , Pesquisas sobre Atenção à Saúde , Serviços de Assistência Domiciliar , Humanos , Masculino , Pessoa de Meia-Idade , Taxa de Sobrevida , Resultado do Tratamento
12.
Egypt J Immunol ; 10(1): 103-9, 2003.
Artigo em Inglês | MEDLINE | ID: mdl-15719627

RESUMO

This study was conducted on 30 asthmatic patients and 10 healthy controls. They were subjected to complete history talking, thorough clinical examination, and assessment of their ventilatory functions before and after bronchodilator. Two specimens were obtained from each patients, bronchoalveolar lavage and serum samples. Chlamydia pneumoniae antigens and antibodies (IgG and IgM) were detected using microimmunoflourescence technique. Samples giving positive results for C. pneumoniae antigen were examined for apoptosis. A significant correlation between asthma and C. pnumoniae was found especially in moderate and severe, long standing, steroid dependent asthma. In addition there was a significant difference between cases and controls regarding specific IgG and IgM. An association of C. pneumoniae with forced expiratory volume 1 (FEVI) was found. In addition C. pneumoniae was found to induce inhibition of programmed cell death. On conclusion, C. pneumoniae infection is associated with severe long standing asthma, and may be an important factor in acute exacerbation of asthma.


Assuntos
Asma/complicações , Infecções por Chlamydia/complicações , Chlamydophila pneumoniae , Adulto , Anticorpos Antibacterianos/sangue , Antígenos de Bactérias/isolamento & purificação , Asma/imunologia , Asma/microbiologia , Líquido da Lavagem Broncoalveolar/imunologia , Líquido da Lavagem Broncoalveolar/microbiologia , Estudos de Casos e Controles , Infecções por Chlamydia/imunologia , Infecções por Chlamydia/microbiologia , Chlamydophila pneumoniae/imunologia , Chlamydophila pneumoniae/isolamento & purificação , Chlamydophila pneumoniae/patogenicidade , Feminino , Humanos , Imunoglobulina G/sangue , Imunoglobulina M/sangue , Masculino , Pessoa de Meia-Idade
15.
Circulation ; 81(4): 1374-9, 1990 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-2317914

RESUMO

To determine whether venting the left ventricle during coronary reperfusion limits myocardial infarct size, we studied paced (200 beats/min) Langendorff rabbit hearts, perfused with blood from a support rabbit. A left coronary artery was occluded for 60 minutes, followed by 2 hours of reperfusion. Four experimental conditions, as follows, were used: In group 1 (control), the hearts contracted isovolumetrically on a fluid-filled balloon in the left ventricle during both occlusion and reperfusion. In group 2, the balloon was present only during occlusion, and the heart was vented during reperfusion. Hearts in group 3 were vented during occlusion and developed pressure during reperfusion. In group 4, the left ventricle was vented during occlusion and reperfusion. Perfusion pressure (91.2 +/- 0.9 mm Hg) and coronary flow (0.88 +/- 0.03 ml/min/g) were not different between groups. Left ventricular pressures (mean of all groups) were 87.3 +/- 1.5 mm Hg systolic and 6.5 +/- 0.6 mm Hg diastolic. Infarcted myocardium was assessed by triphenyl tetrazolium staining and expressed as a percentage of the area at risk, as measured by fluorescent particles. Venting during both ischemia and reperfusion (n = 10) did result in significantly smaller infarcts than in the unvented controls (n = 10), that is, 13 +/- 5% vs. 41 +/- 6%, respectively. Venting only during reperfusion (n = 10) or occlusion (n = 11) did not significantly limit infarct size (57 +/- 6% and 32 +/- 5%, respectively), as compared with controls. Thus, the clinically feasible intervention of left ventricular venting during reperfusion was not cardioprotective.


Assuntos
Coração/fisiopatologia , Infarto do Miocárdio/patologia , Reperfusão Miocárdica , Animais , Feminino , Ventrículos do Coração , Hemodinâmica , Técnicas In Vitro , Masculino , Infarto do Miocárdio/fisiopatologia , Coelhos , Fatores de Risco
16.
Free Radic Biol Med ; 9(6): 465-71, 1990.
Artigo em Inglês | MEDLINE | ID: mdl-1964145

RESUMO

Limited dose-response curves for superoxide dismutase (SOD) were assessed in isolated and in vivo hearts. SOD at 2.3, 7, 20, or 50 mg/L suppressed CK release in Langendorff rat hearts by 61%, 63%, 72%, and 30%, respectively. SOD at 0.5, 1, 5, and 50 mg/L suppressed LDH release in Langendorff rabbit hearts by 32%, 48%, 54%, and -12%, respectively. In rabbit hearts subjected to coronary artery ligation and reperfusion in vivo, SOD at 2, 5, or 15 mg/kg reduced infarct size by 10%, 30% or 19%, respectively, while 50 mg/kg increased infarct size by 28%. In conclusion, while SOD was protective at low doses in all models, protection was lost at higher doses in the isolated rat and rabbit hearts, and exacerbation of damage was seen in the in vivo rabbit hearts.


Assuntos
Doença das Coronárias/tratamento farmacológico , Superóxido Dismutase/farmacologia , Animais , Creatina Quinase/metabolismo , Modelos Animais de Doenças , Ditiocarb/farmacologia , Relação Dose-Resposta a Droga , Ativação Enzimática/efeitos dos fármacos , Radicais Livres , L-Lactato Desidrogenase/metabolismo , Reperfusão Miocárdica , Oxigênio/metabolismo , Coelhos , Ratos
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