RESUMO
La apolipoproteina B (apoLp B) es el principal constituyente proteico de la vía aferente del colesterol a los tejidos periférico. Se ha propuesto que sea un mejor marcador de enfermedad cardiovascular que el colesterol LDL(cLDL). El objetivo de este trabajo es determinar las concentraciones plasmáticas de apoLp B, su relación con el cLDL, el valor deseable y de alto riesgo, y evaluar las hiperapolipoproteinemias B en pacientes con cLDL por debajo del valor de riesgo (cLDL<160 mg/dl). Se estudiaron 265 muestras de pacientes en el Hospital Universitario. Se determinó apolipoproteina B, CT, TG, cHDL y cálculo de cLDL. Cuando el valor de cLDL fue < 130 mg/dl, el valor de apoLp B fue < 98 mg/dl, un valor deseable. Para un valor de cLDL > 160 mg/dl, el valor de apoLp B fue > 120 mg/dl, un valor de riesgo alto. De los pacientes con cLDL<160 mg/dl (n=202), un 3,5% tuvieron valores de apoLp B mayores de 120 mg/dl. Encontramos un valor deseable de apoLp B de 98 mg/dl y un valor de riesgo alto de 120 mg/dl. Un 3,5% de pacientes que teniendo valores de cLDL de 160 mg/dl presentaron apolipoproteina B>120 mg/dl, que podría corresponder a pacientes con hiperapolipoproteinemia B. Es en estos pacientes con sospecha de alto riesgo coronario pero que presentan cLDL por debajo del nivel de riesgo, en quienes se recomienda dosificar apoLp B, como factor emergente de riesgo coronario.
Apolipoprotein B (apoLp B) is the main protein component of the cholesterol delivery route to peripheral tissues. It has been proposed as a better predictor of cardiovascular disease than LDL cholesterol. The aims of this study were to determine the serum concentration of apoLp B, its relation with LDL cholesterol, its "desirable" and "high risk" limits and to evaluate patients with hyperapolipoproteinemia B and cLDL below risk values. A total of 265 subjects were randomly selected from a population referred for lipid studies to the Hospital Universitario. We measured concentrations of apoLp B, total cholesterol, triglycerides, HDL cholesterol and calculated LDL cholesterol. When LDL cholesterol was < 130 mg/dl, apoLp B value was < 98 mg/dl, which corresponds to a "desirable" limit. When LDL cholesterol was >160 mg/dl, apoLp B value was > 120 mg/dl, corresponding to a "high risk" limit. Of all patients with LDL cholesterol < 160 mg/dl (n=202), 3.5% had apolipoprotein B > 120 mg/dl. We found a desirable apoLp B value of 98 mg/dl and high risk apoLp B value of 120 mg/dl. In the patients with LDL cholesterol below 160 mg/dl, 3.5% showed apoLp B values above 120 mg/dl and they were considered patients with hyperapolipoproteinemia B. In this population with suspicion of coronary disease but without risk LDL cholesterol values, the measurement of apoLp B, as an emerging coronary risk factor, is strongly recommended.
Assuntos
AbetalipoproteinemiaRESUMO
A study of the prevalence of asthma in schoolchildren in Montevideo was undertaken with the use of an appropriate questionnaire. Data consisted of cumulative prevalence, point-prevalence, variations referred to sexes, the age of onset of symptoms and their variation of frequency, the duration of symptoms, personal and family history of atopy and the limitation attributed to asthma in schooling, sporting and physical activities. In the study entered 4,296 children, with a mean age of 12.3 years. Cumulative prevalence was 12.4% for the group with no difference between boys and girls. A tendency for a significant difference in cumulative prevalence was noted comparing industrial and suburban zones. Point-prevalence was 7.5% with no difference between sexes. The mean age of onset of asthma was 3.7 years for boys and 3.5 years for girls. Mean duration of symptoms was 7.6 years for boys and 7.4 years for the girls. Fourteen percent had a personal history and 11% a family history of eczema. Fifty-six percent had a personal history, while 55% a family history of rhinitis and 58% had a family history of asthma. These figures differ significantly from the non-asthmatic population sampled. Limitation in physical and sporting activities attributed to asthma was found in 35% of the boys and 41% of the girls.
