Luis A Bracero

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Uterine artery velocimetry was performed by means of a continuous-wave Doppler ultrasound. Serial studies were done on 12 nonpregnant and 79 normal pregnant women. Measurements were made on both uterine arteries and averaged. From the proliferative phase of the menstrual cycle through 40 weeks of pregnancy, four developmental phases are described. These(More)
Treatment of preterm labor with beta-sympathomimetics has been questioned because of the many maternal and fetal complications associated with its use. Nifedipine, a calcium antagonist, has been shown to suppress uterine activity in vitro and in vivo. A randomized prospective study was performed to compare the efficacy of nifedipine to ritodrine in the(More)
Uterine and umbilical artery velocimetry was carried out on 71 women with hypertensive disorders in pregnancy. Three categories of hypertensive disease were diagnosed: chronic hypertension, preeclampsia, and chronic hypertension with superimposed preeclampsia. Clinical classifications describe the severity of disease effectively, primarily because the(More)
Ultrasound and Doppler umbilical artery velocimetry have been used to diagnose the small-for-gestational-age (SGA) fetus. Both techniques are relatively inefficient for this diagnosis. The aim of the present study was to see whether their serial use improved diagnostic accuracy. Forty women with an ultrasound diagnosis of SGA within three weeks of delivery(More)
A continuous-wave Doppler unit was used to obtain umbilical artery velocity waveforms and to calculate the peak-systolic/diastolic ratio, a reflection of vascular resistance distal to the point of measurement. A total of 587 examinations were performed on 189 women between 18 to 42 weeks' gestation. The neonates were divided in four groups based on their(More)
The aim of this study was to determine whether there is a gender-related difference in the morbidity and mortality of infants of diabetic mothers. We also wanted to identify risk factors associated with adverse pregnancy outcome, and create a perinatal morbidity index. We performed a retrospective review of 107 women whose pregnancies were singleton and(More)
The purpose of this study was to determine which test is best for predicting adverse outcomes in pregnancies complicated by diabetes: the nonstress test, biophysical profile, or umbilical artery velocimetry. We evaluated 207 singleton pregnancies complicated by diabetes within 1 week of delivery using the afore-mentioned pregnancy surveillance tests.(More)
Doppler umbilical artery velocimetry has been used to study high-risk pregnancies. The most extreme waveform abnormality is the absence of end-diastolic velocity. To examine the significance of this finding, events outcome was evaluated in 161 women studied between 31 and 36 weeks. Ten had absence of end-diastolic velocity. When compared with fetuses with(More)
OBJECTIVE This study tested the null hypothesis that the number of fetal surveillance tests and perinatal outcomes would not differ statistically between pregnancies randomized to visual or computerized interpretation of antepartum nonstress test results. STUDY DESIGN A prospective, randomized controlled trial was conducted, which required a sample size(More)
Fifty-four women who were delivered of small for gestational age infants were studied antenatally by serially continuous-wave Doppler velocimetry. Outcomes were compared in the normal and abnormal systolic/diastolic ratio groups. Seventy-eight percent had an abnormal systolic/diastolic ratio. The group with an elevated systolic/diastolic ratio had a(More)