[Procoagulant properties of the amniotic fluid. IV. The acceleration time of thromboplastin in the amniotic fluid in pathologic pregnancy]. / Propiedades procoagulantes del líquido amniótico. IV. El tiempo de aceleración de tromboplastina en líquido amniótico en el embarazo patológico.

With the purpose of know the behaviour of the thromboplastic acceleration time in amniotic fluid, there were analized 390 amniotic fluids, 241 from normal pregnancies and 149 from abnormal pregnancies, of these, 52 from diabetic women, and 97 from hypertensive women. It was found an important increase in T.A.T. with the progress of pregnancy and their usefulness as fetal lung maturity test. It was concluded, that this method is easy, cheap, and highly specific, so it can be the first election test for determination of fetal lung maturity in low resources Obstetric Centers.

[Fetal growth in prolonged pregnancy]. / Crecimiento fetal en el embarazo prolongado.

Posterm pregnancy still is a topic full of controversies in many aspects, such as diagnosis, perinatal risk and management. This paper suggests that a great number of fetuses from prolonged pregnancies, still grow after term, secondary to a persistent and adequate placental function; it's demonstrated, by comparing the distribution of newborn weights between term and posterm pregnancies. In the posterm group a significant increase in the incidence of hypertrophic newborns, is found. Dismature newborns, products of the placentary insufficiency in posterm pregnancy, although the point of interest of obstetricians, pediatricians and perinatologists because of its high rates of morbimortality, constitute a minority in comparison with fetus of posterm pregnancies with high newborn weights. It is possible that fetal hypertrophy by it self may be another cause of morbimortality in posterm pregnancies (because of dystocias, prolonged labor, altered fetopelvic relations, increased rates of cesarean sections, and others) that must be determined in future longterm, prospective analysis.