RESUMO
OBJECTIVE: The purpose of this study was to examine 6-keto-prostaglandin F(1)(alpha) and thromboxane B(2) plasma levels throughout normotensive and preeclamptic pregnancies and to analyze the predictive values of these quantifications for the detection of preeclampsia during the second trimester of pregnancy. STUDY DESIGN: Blood samples were collected from 30 healthy, nonpregnant women and at 4-week intervals from a cohort of nulliparous women who were recruited before 16 weeks of gestation. Preeclampsia developed in 26 patients; 52 normotensive control subjects were matched from the same cohort. The 6-keto-prostaglandin F(1)(alpha) and thromboxane B(2) were assayed by radioimmunoassay. Trends were compared between pregnancy groups and with the nonpregnant women. Predictive values were determined with the second-trimester assessments. RESULTS: The 6-keto-prostaglandin F(1)(alpha)/thromboxane B(2) ratio decreased throughout pregnancy in women with preeclampsia; there were no significant changes in normotensive women. We found higher thromboxane B(2) levels within the group with preeclampsia during the first gestational trimester (preeclampsia, 188 +/- 17 pg/mL; control, 119 +/- 4.8 pg/mL [mean +/- SEM]; P =.001). During the third trimester, patients with preeclampsia had lower 6-keto-prostaglandin F(1)(alpha) levels than did control subjects (preeclampsia, 191 +/- 9.8 pg/mL; control, 288 +/- 10 pg/mL; P =.001). The 6-keto-prostaglandin F(1)(alpha)/thromboxane B(2) ratio was suitable to calculate predictive values; the best cutoff point and time interval were 3.0 and 22 to 26 weeks of gestation, respectively. Sensitivity, specificity, and positive and negative predictive values were 88%, 97%, 69%, and 99%, respectively; the odds ratio was 14.6 (95% CI, 6.9-30.4). CONCLUSION: The prostacyclin/thromboxane ratio favored vasoconstriction early in gestation in women in whom preeclampsia developed. A 6-keto-prostaglandin F(1)(alpha)/thromboxane B(2) ratio of Assuntos
6-Cetoprostaglandina F1 alfa/sangue
, Pré-Eclâmpsia/sangue
, Tromboxano B2/sangue
, Adulto
, Biomarcadores/sangue
, Estudos de Casos e Controles
, Estudos de Coortes
, Feminino
, Humanos
, Estudos Longitudinais
, Razão de Chances
, Valor Preditivo dos Testes
, Gravidez
, Segundo Trimestre da Gravidez
, Terceiro Trimestre da Gravidez
, Valores de Referência
, Sensibilidade e Especificidade
RESUMO
Se ha demostrado que las concentraciones de moléculas asociadas con el daño endotelial, la coagulación y la vasoconstricción están alteradas en la preeclampsiaeclampsia, sin haberse evaluado su relación con los diferentes grados de severidad de esta entidad. Objetivo. Determinar el grado de asociación entre las concentraciones plasmáticas de fibronectina ED1+, antitrombina III, prostaciclina y tromboxano y la severidad de la preeclampsia. Métodos. Se tomó una muestra de sangre periférica en 215 mujeres en el tercer trimestre de la gestación, que ingresaron al Hospital de Ginecología y Obstetricia 4 "Luis Castelazo Ayala" con los diagnósticos de preeclampsia leve (n=103), preeclampsia severa (n=71), síndrome de HELLP (n=25) o eclampsia (n=16). Los plasmas se almacenaron a -70ºC hasta su análisis. La fibronectina ED1+ se midió mediante análisis inmunoenzimático; la actividad de antitrombina III mediante análisis amidolítico automatizado y los metabolitos estables 6cetoprostaglandina F1a y tromboxano B2 se cuantificaron mediante radioinmunoanálisis