ABSTRACT
The goal was to study the cardiotocographic alterations due to abrupt oligoamnios which follows the premature rupture of membranes. In this way, 96 antepartum cardiotocograms were analysed in 72 pregnant women with premature rupture of membranes, between the gestational ages of 28 weeks and 41 weeks and 6 days, constituing the studied group. The cardiotocograms of the these patients were compared to 72 cardiotocograms of 72 normal pregnant women with integral membranes of gestational ages similar to the pregnant women of the studied group, constituing the control group. The compared cardiotocografic variables were: the basal fetal heart rate, periodic and nonperiodic alterations of basal fetal heart rate, and acelerated response to vibroacustic stimulation. In the studied group were still carried ou the correlation between the cardiotocogram and APGAR score in the first and fifith minute, the perinatal underliving, the gestacional age adequacy and also the membrane ruptures time. They have still evaluated the validity ot the antepartum cardiotocography concerning to the sensibility, specificity, positive and negative predictive values. They conclude that the premature rupture of membranes diminishes the variability of basal fetal heart rate the fetal reactivity to fetal corporal movements and to vibroacustic stimulation, and also predisposes to the apperearence of variable desacelarations,contributes to a greater number of subnormal, pahtological cardiotocograms, associates to lower rates fo APGAR score in the fifth minute, suggests a greater incidence fo small for the gestational age infant and finally associates with a large incidence of pathological cardiotocograms after 7 days of rupture of membranes. The antepartum cardiotocography showed to be propedeutic with a good sensibility and specificity, and also a good negative predictive value, even in patients with premature rupture of membranes. At last, before pregnant women with premature rupture of membranes in which the conservative managements is to be taken , the accomplishment of antepartum cardiotocography in imposed, aiming at the perinatal results improvement