oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 2 )

2018 ( 4 )

2016 ( 2 )

2015 ( 14 )

Custom range...

Search Results: 1 - 10 of 1150 matches for " ILEANA HOLST "
All listed articles are free for downloading (OA Articles)
Page 1 /1150
Display every page Item
Disminución en la prevalencia de anticuerpos contra Toxoplasma gondii en adultos del valle central de Costa Rica
ZAPATA,MELISSA; REYES,LILLIANA; HOLST,ILEANA;
Parasitología latinoamericana , 2005, DOI: 10.4067/S0717-77122005000100004
Abstract: this is a study of the seroprevalence of toxoplasma gondii in a representative sample of individuals from the central valley of costa rica. four hundred volunteers aged 20 to 40 years old participated in this survey. the influence of age, gender, socioeconomic condition and urban or rural origin of the subjects on the seroprevalence rate was evaluated. the determination of igg antibodies for t. gondii was carried out with a qualitative enzyme-linked-immunosorbent-assay (elisa) trademark human (germany). the general prevalence of antibodies in the studied population was 58%, lower than the ones published in previous reports in our country. a significant increase in the seropositivity was found as the age increased (p=0,002). male individuals and those of rural origin showed a higher seroprevalence than women (61,5% vs 55%; p=0,225) and adults of urban origin (62,7% vs 56,4%; p=0,394) respectively, although these differences were not statistically significant. a higher proportion of positive individuals for t. gondii of low socioeconomic status was found (67,1%) in comparison with those in middle (55,6%; p=0,048) or high status (48,7%; p= 0,014). the present study reveals an important decrease in the seroprevalence for t. gondii in the population of the central valley of costa rica, therefore, increasing the number of susceptible people to the infection. it is quite important to focus on a better clinical and epidemiological surveillance toward the detection and prevention of the infection in the seronegative pregnant women
Disminución en la prevalencia de anticuerpos contra Toxoplasma gondii en adultos del valle central de Costa Rica DECREASED PREVALENCE OF Toxoplasma gondii ANTIBODIES IN ADULTS FROM THE CENTRAL VALLEY OF COSTA RICA
MELISSA ZAPATA,LILLIANA REYES,ILEANA HOLST
Parasitología latinoamericana , 2005,
Abstract: Este estudio analiza la seroprevalencia contra Toxoplasma gondii en una muestra representativa de individuos del Valle Central de Costa Rica. Participaron voluntariamente 400 adultos costarricenses con edades entre 20 y 40 a os. Se valoró la influencia de la edad, sexo, condición socioeconómica y procedencia de los sujetos (urbana o rural) sobre la tasa de seroprevalencia. La determinación de anticuerpos IgG contra T.gondii se realizó con una técnica de ELISA cualitativa marca Human (Alemania). La prevalencia general de anticuerpos en la población estudiada fue de 58%, inferior a las reportadas en estudios anteriores realizados en el país. Se encontró un aumento significativo en la seropositividad al aumentar la edad (p = 0,002). Los hombres y aquellos individuos de procedencia rural mostraron una mayor seroprevalencia con respecto a las mujeres (61,5% vs 55%; p = 0,225) y los adultos de origen urbano (62,7% vs 56,4%; p = 0,394) respectivamente, aunque estas diferencias no mostraron ser significativas. Se observaron diferencias significativas entre la proporción de individuos positivos por T. gondii con un nivel socioeconómico bajo (67,1%) con respecto a los de niveles medio (55,6%; p = 0,048) y alto (48,7%; p = 0,014). El presente estudio refleja una importante disminución de la seroprevalencia contra T. gondii en la población del Valle Central de Costa Rica, incrementando el número de personas susceptibles a la infección This is a study of the seroprevalence of Toxoplasma gondii in a representative sample of individuals from the Central Valley of Costa Rica. Four hundred volunteers aged 20 to 40 years old participated in this survey. The influence of age, gender, socioeconomic condition and urban or rural origin of the subjects on the seroprevalence rate was evaluated. The determination of IgG antibodies for T. gondii was carried out with a qualitative enzyme-linked-immunosorbent-assay (ELISA) trademark Human (Germany). The general prevalence of antibodies in the studied population was 58%, lower than the ones published in previous reports in our country. A significant increase in the seropositivity was found as the age increased (p=0,002). Male individuals and those of rural origin showed a higher seroprevalence than women (61,5% vs 55%; p=0,225) and adults of urban origin (62,7% vs 56,4%; p=0,394) respectively, although these differences were not statistically significant. A higher proportion of positive individuals for T. gondii of low socioeconomic status was found (67,1%) in comparison with those in middle (55,6%; p=0,048) or high status (48,7%;
Seroprevalencia de los virus de la Hepatitis A y B en grupos etarios de Costa Rica
Mayra L. Taylor,Zaida García,Ileana Holst,Teresita Somogye
Acta Médica Costarricense , 2001,
Abstract: Justificación y Objetivos: Debido a la persistencia de casos y brotes de hepatitis viral A y B en el país, junto con la observación de un aumento importante de infecciones por el tipo A en la población de adultos, se planteó la necesidad de establecer la prevalencia de estos dos tipos de hepatitis en diferentes grupos etarios en nuestro país. Métodos: La seroprevalencia de los virus de la hepatitis A (VHA) y de hepatitis (VHB); fueron investigadas en 873 muestras de ni os pre-escolares menores de 7 a os de la encuesta nacional de nutrición en 1996; 614 ni os escolares de 9 a 15 a os de una encuesta de nutrición de la Universidad de Costa Rica realizada en 1997 y 996 muestras en adultos, estudiantes y funcionario de esta misma universidad recolectadas en 1994. Las muestras se analizaron por anticuerpos totales contra al VHA (anti-VHA total), VHB antígeno de superficie (HbsAG) y anticuerpos totales contra la proteína del núcleo o "core" (anti-HBc total). Resultados: Se encontró un 6.8%, 13.2% y 71.7% de anti-VHA total en los prescolares, escolares y adultos, respectivamente, con una creciente prevalencia en relación con la edad. La presencia de estos anticuerpos en los escolares estuvo asociada con la escolaridad de los padres y su condición socieconómica; siendo mayor cuando los padres tenían un menor nivel de escolaridad (24% con secundaria incompleta versus 7.6% con nivel educativo superior) y entre padres sin capacitación técnica o profesionales (16% versus 8.7% en los padres con estudios superiores). También se encontró una diferencia en la prevalencia de anti-VHA entre estudiantes de escuelas públicas (19.5%) versus privadas (6.9%). En los preescolares, el único grupo con representación estadística geográfica; la provincia de Guanacaste presentó un riesgo de 2 a 3 veces mayor de tener anticuerpos contra el VHA (21%) que los ni os procedentes de otras provincias, lo cual es concordante con los datos relacionados con condiciones socioeconómicas más bajas, falta de agua potable, letrinización y hacinamiento en las áreas rurales. En cuanto a los marcadores de VHB, se encontró una prevalencia de 0.5%, 0.2% para HbsAG y 2.8%, 0.3% y 4.0% para el anti-HBc total en preescolares, escolares y adultos, respectivamente. No hubo ninguna relación entre las condiciones socioeconómicas o la edad, para estas prevalencias, pero el anti-HBc fue más alto en los hombres (6.9% en hombres y 2.3% en mujeres). Conclusiones: Al comparar los datos obtenidos en décadas en Costa Rica sobre estos dos tipos de hepatitis se encontró que la hepatitis B, sigue teniendo un patrón epid
Seroprevalencia de los virus de la Hepatitis A y B en grupos etarios de Costa Rica
Taylor,Mayra L.; García,Zaida; Holst,Ileana; Somogye,Teresita; Cunningham,Lowella; Visoná,Kristen A.;
Acta Médica Costarricense , 2001,
Abstract: justification and objetives: due to persistence of acute cases and outbreaks of viral hepatitis a and b in our country and the observation of an important increase of type a infections in the adult population, it was considered necesary to establish the prevalence of these two types of hepatitis in different age groups in our country. methods: seroprevalence of viral hepatitis a (hav) and viral hepatitis b (hbv), was studied in a population which included 873 pre-scholar children < 7 years from a national nutritional survey in 1996; 614 scholar children 9-15 years from a national nutritional survey carried out by the university of costa rica during 1996 and 1997, and 996 samples from students and personnel from this same university collected during 1994. these samples were analyzed for total antibodies to hav (anti-hav total), hbv surface antigen (hbsag) and total antibodies against core (anti-hbc total). results: the percentage of anti-hav was established to be 6.8%, 13.2% and 71.7% for the pre-scholar children, scholars and adults, respectively, with an increasing prevalence related to age. the presence of antibodies in the "scholar group" was associated with education level of the parents and their socioeconomic status, being higher for parents with a lower education level (24% with incomplete high school versus 7.6% with higher education level) and among parents with-out technical or professional training (16% versus 8.7% in the parents with higher education level). also, it was a difference between the presence of anti-hav among students from public schools (19.5%) versus private schools (6.9%). in the prescholar children, which was the only group with geographic statistical significance, the province of guanacaste showed a 2-3 times higher risk to have hav antibodies (21%) than in children from other provinces. this is in concordance with data related to low socio-economical status, lack of potable water and poor sanitary conditions. the study shower a prevale
Perfil de lípidos y lipoproteínas en inmigrantes chinos residentes en Costa Rica
Holst,Ileana; Monge-Rojas,Rafael; Marín,Rita Ma; Hidalgo,Karol; Kelly,Mónica;
Archivos Latinoamericanos de Nutrición , 2002,
Abstract: lipid profile of chinese immigrants living in costa rica. the lipid profile and food pattern of 50 chinese immigrants living in san josé, costa rica were studied during 1999. the results showed that 35% of the immigrants had high levels of total cholesterol (3 5,16 mmol/l) and 51% had high concentrations of ldl-cholesterol (3 2,84 mmol/l). moreover, 36% of them had high levels of triglycerides (> 1,69 mmol/l) and only the 15% had low concentrations of hdl-cholesterol (£ 0,90 mmol/l). the ratio of men with high levels of total cholesterol, ldl-cholesterol and triglycerides and low levels of hdl-cholesterol was larger that the one in women; although this difference was not significant. 41% of the studied population presented castelli?s indexes (tc/hdl-c) above 4,5. in general, around 80% of the chinese immigrants consume vegetables 5-6 times/week and 50% consume fruits with the same frequency. a high percentage of the immigrants eat food with animal protein more than 3 times/week and around 23% eat frequently snacks and fast foods. our data suggest that the chinese immigrants still keep some characteristics of their nutritional culture. nevertheless, they have changed their food pattern to a more atherogenic one. it?s important that nutritionists and other health professionals evaluate in detail the factors associated with the change in the food pattern of the immigrants, in order to avoid an increase in the rates of morbi-mortality of coronary disease in this group of population.
Niveles séricos de homocisteína total y lipoproteínas en adultos jóvenes de áreas rurales y urbanas de Costa Rica
Holst -Schumacher,Ileana; Monge-Rojas,Rafael; Barrantes-Santamaría,Mauro;
Archivos Latinoamericanos de Nutrición , 2006,
Abstract: this study evaluated the lipid profile and the serum levels of total homocysteine of 400 adults aged 20 to 40 years, residents of rural and urban areas of the central valley of costa rica. the results showed that the proportion of subjects from urban areas with high levels of ldl-c (= 4,13 mmol/l) was 11% higher than the proportion of adults from rural areas (29,2% y 18,0%, p=0,045). on the contrary, the proportion of rural subjects with low hdl-c levels (< 1,03 mmol/ l) was higher 19% than the proportion of urban adults (56,0% y 75,3%, p=0,001). rural residents also showed higher serum levels of triglycerides and total homocysteine than the urban residents, although the differences were not significant (tg: 1,94 mmol/l y 2,02 mmol/l, p=0,529; th: 9,33 ìmol/l y 9,84 ìmol/l, p=0,145). the prevalences of hyperhomocysteinemia (>15 ìmol/l), hypercholesterolemia (= 5,17 mmol/l) and hypertriglyceridemia (=1,69 mmol/l) in the studied population were 5,8%, 53,6% y 50,1% respectively. 82% of the studied population had ldl-c levels above 2,58 mmol/l and approximately 61% of the adults had hdl-c levels lower than 1,03 mmol/l. our data suggest that the studied costarrican population has a very high cardiovascular risk. the prevalence of low levels of hdl-c (< 1,03 mmol/l), marginal levels of total homocysteine and a tendency to have high levels of triglycerides were the most outstanding cardiovascular risk factors found in this population, specially in rural subjects, which could be associated with the quality of the diet of these habitants. it is necessary to develop effective intervention strategies to promote healthy lifestyles in the population in order to reduce the cardiovascular mortality rates in costa rica.
Determinación del dímero D en pacientes con anticoagulante lúpico
Salazar,Lisbeth; Jiménez,Rafael; Holst,Ileana; Madrigal,Fernando; Fonsecaz,Jorge;
Revista Costarricense de Ciencias Médicas , 1997,
Abstract: the determination of dimer-d has a great value establishing the diagnosis of deep venous thrombosis. however, in patients that present lupic anticoagulant, its importance and discovery are still not well defined. because of these reasons, an investigation was planned to evaluate its presence in 80 patients with descriptions suggesting the antiphospholipid syndrome. all patients were aged 20 and 40 years. from the total sample estudied only 13 cases (16%), showed a positive test for the mentioned syndrome. five cases (1 man and 4 women) had positive lupic anticoagulant and 8 cases (2 men and 6 women) had positive the anticardiolipin antibodies. to the whole group of 13 patients the dermination of dimer-d was made by 2 different methods. the levels of fibrinogen and the presence of the fibrinogen degradation products were also realized. the methods used to determine dimer-d were: indirect agglutination with latex particles, and an elisa test. the results obtained show that the patients with a positive lupic anticoagulant and/or a positive anticardiolipin antibodies, together with the presence of dimer-d, describes cases with venous oclussion wich contributes to the genesis of the trombotic problem.
Prevalence of mild serum vitamin B12 deficiency in rural and urban Costa Rican young adults
Holst-Schumacher,Ileana; Monge-Rojas,Rafael; Barrantes-Santamaría,Mauro;
Revista Panamericana de Salud Pública , 2007, DOI: 10.1590/S1020-49892007001100005
Abstract: objective: recent studies have shown an increase of mild serum cobalamin (vitamin b12) deficiency in some latin american countries; however, no data are available from costa rica. the purpose of this work was to establish the prevalence of serum vitamin b12 deficiency among costa rican young adults and to study some factors that may help explain the serum cobalamin concentrations. methods: a cross-sectional survey was conducted among 400 adults aged 20 to 40 years old from urban and rural areas of the central valley of costa rica to determine serum vitamin b12 levels. additionally, cobalamin dietary intake and the detection of helicobacter pylori igg antibodies were studied as possible determinants of the serum vitamin b12 concentrations. results: the mean serum concentration of vitamin b12 was 268 ± 125 pmol/l, and no significant differences were found by gender or area. study data indicate an overall prevalence of inadequate serum cobalamin levels of 42.4% (11.2% deficient and 31.2% marginal); more than 50% but less than 75% of individuals had an intake of vitamin b12 below the u.s. estimated average requirement (ear) and 61.2% had igg antibodies to h. pylori. conclusions: the prevalence of mild serum vitamin b12 deficiency in young costa rican subjects is as high as in other latin american countries. more investigation should be done to elucidate the etiological factors that are generating deficient and marginal serum cobalamin levels in costa rican adults in order to define appropriate public health actions.
Genetic, dietary, and other lifestyle determinants of serum homocysteine levels in young adults in Costa Rica
Holst-Schumacher,Ileana; Monge-Rojas,Rafael; Cambronero-Gutiérrez,Priscilla; Brenes,Gilbert;
Revista Panamericana de Salud Pública , 2005, DOI: 10.1590/S1020-49892005000400007
Abstract: objective: elevated serum total homocysteine (thcy) is considered an independent risk factor for cardiovascular disease. the objective of this study was to develop the first-ever information on the prevalence of hyperhomocysteinemia and its determinants in a population in costa rica. methods: a cross-sectional study was conducted to determine serum levels of thcy, vitamin b12, folate, and creatinine, as well as the presence of the genotype tt for the methylenetetrahydrofolate reductase (mthfr) enzyme. additionally, dietary vitamin intakes and other lifestyle risk factors were assessed. a total of 399 costa rican adults from the central valley of the country (where the capital city, san josé, is located), aged 20 to 40 years, participated in this study in the year 2000. analyses of variance were performed for continuous variables, and the chi-square test was used for categorical data. spearman correlation tests were calculated to determine associations between variables. three linear regression analyses and one binary logistic model were developed in order to determine the predictors for homocysteine levels in the population studied. results: the overall prevalence of hyperhomocysteinemia (> 15 μmol/l) in the population was 6%, 31% of the population were in the range of 10 to 15 μmol/l, 29% had the genotype tt for the enzyme mthfr, 18% presented a vitamin b12 deficiency (< 165 pmol/l), and none of the persons had low serum folate levels (< 7.0 nmol/l). no significant associations were found between thcy and age, smoking, consuming alcohol, or dietary vitamin intake. conclusions: only serum vitamin b12 levels and the genotype tt of the enzyme mthfr were considered significant predictors of high serum thcy levels in the costa rica population studied.
Socio-Demographic, Biopsychosocial and Lifestyle Behaviors Related with Eating Disorders of Children and Adolescents of Costa Rica  [PDF]
Nú?ez-Rivas Hilda Patricia, Holst-Schumacher Ileana, Campos-Saborío Natalia
Food and Nutrition Sciences (FNS) , 2019, DOI: 10.4236/fns.2019.108073
Abstract: The objective of the study was to evaluate the association of sociodemographic, biopsychosocial and lifestyle behaviors (diet, sedentarism and physical activity) with eating disorders (ED) in a national sample of Costa Rican children and adolescents. This was a cross-sectional and descriptive study. A total of 2667 students of elementary, middle and high school from sixty-four educative centers (40 schools and 24 high schools) of Costa Rica participated in the study. The predictive factors associated with ED are: body image dissatisfaction (β = 0.367; p < 0.001), lifetime addictive behaviors (β = 0.131; p < 0.001), to be a girl (β = 0.109; p < 0.001), intentionally hurt or harm itself (β = 0.074; p < 0.001), BMI (β = 0.053; p < 0.001), socioeconomic index (β = 0.052; p < 0.001) and sedentary behaviors (β = 0.051; p < 0.001). While the frequency of physical activity (β
Page 1 /1150
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.