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Biomedical subjects

R O Bahado-Singh

Publications and source records attributed to R O Bahado-Singh.

At least 19 recordsLinked to original sources
PubMed2004

Pregnancy outcomes with increased nuchal translucency after routine Down syndrome screening.

OBJECTIVES: The purpose of this study was to evaluate the outcomes of pregnancies with nuchal translucency greater or equal to 3 mm for routine first trimester screening in unselected populations. METHODS: A total of 2980 pregnant women for first trimester ultrasonography were routinely offered crown-rump length (CRL) and nuchal translucency (NT) for screening for Down syndrome between 11 and 14 weeks' gestation. A complete follow-up was obtained in all cases by a review of medical records. RESULTS: Using a cut-off value of 3 mm, the prevalence of increased fetal NT was 0.7% (n=22). Among the 22 cases, there were five (22.7%) chromosomal abnormalities. Of the 17 chromosomally normal pregnancies, four resulted in fetal demise (spontaneous abortion, intrauterine death or termination of pregnancy due to fetal abnormalities). The remaining 13 pregnancies resulted in live births, including one gestational hypertension and one preterm delivery, respectively. The total incidence of an adverse outcome in the group of increased fetal NT was 45.5%. CONCLUSIONS: In a routine population with first-trimester ultrasonography, fetal NT measuring greater than or equal to 3 mm was associated with a poor pregnancy outcome with not only chromosomal abnormalities and congenital cardiac diseases, but also poor maternal and fetal health or adverse pregnancy outcomes. In addition, this study also demonstrated the necessity for fetal assessment and follow-up in cases where the fetal NT is increased in the first trimester.

Adolescent↗
PubMed2002

The role of hyperglycosylated hCG in trophoblast invasion and the prediction of subsequent pre-eclampsia.

OBJECTIVE: Hyperglycosylated hCG (HhCG) is the predominant form of chorionic gonadotrophin in states characterized by aggressive trophoblast invasion such as early pregnancy or choriocarcinoma. Pre-eclampsia may be the result of failed or inadequate trophoblast invasion. We investigated whether low levels of maternal urine HhCG levels would predict subsequent pre-eclampsia. STUDY DESIGN: Mid-trimester urine (14-21 weeks) was collected and frozen from non-hypertensive women undergoing genetic amniocentesis. Inclusion criteria were: normal singleton pregnancies without a prior history of pre-eclampsia, hypertension, diabetes or other vascular disorders. The specimens were subsequently thawed, and HhCG levels standardized to urine creatinine were measured. Maternal charts were reviewed after delivery to determine the development of pre-eclampsia. There were a total of 568 study subjects. RESULTS: Pre-eclampsia developed in 26 (4.6%) women. There was a significant correlation between low urine HhCG and subsequent pre-eclampsia (Mantel-Haenszel test of linear association: Chi-square 10.52, p=0.001). The mean HhCG level (ng/mg creatinine) was significantly greater in normals than in those destined to develop pre-eclampsia: 42.7 versus 20.3, p=0.002 (Mann-Whitney U-test). There was a progressive increase in the risk of subsequent pre-eclampsia as HhCG levels fell: HhCG < or =0.9 MoM RR (95% CI)=1.51 (1.15-1.98) compared with < or =0.1 MoM 10.42 (2.0-54.3). CONCLUSION: Low maternal mid-trimester urine HhCG predicted subsequent pre-eclampsia. This appears to support the view that pre-eclampsia results at least in part from poor trophoblast invasion. Thus, HhCG may play a role in trophoblast invasion and measurement of this in urine identifies women at high risk for developing pre-eclampsia.

Amniocentesis↗
PubMed2002

Renal artery Doppler investigation of the etiology of oligohydramnios in postterm pregnancy.

OBJECTIVE: To investigate the etiology of oligohydramnios in postterm pregnancy using Doppler velocimetry. METHODS: Renal and umbilical artery Doppler velocimetry were performed in women with singleton postterm (287 days' or more gestation) pregnancies. The renal and umbilical artery Doppler resistance index (RI) and end-diastolic velocity were measured. Stepwise logistic regression and the two-tailed t test were used to determine whether the Doppler indices correlated with oligohydramnios (amniotic fluid index less than 5 cm). RESULTS: We studied 147 well-dated, singleton, postterm pregnancies, of which 21 (14.3%) had oligohydramnios. For the study cohort, the mean (+/-standard deviation) gestational age at Doppler was 41.4 +/- 0.45 weeks and at delivery 41.8 +/- 0.47 weeks. Stepwise logistic regression using renal and umbilical artery Doppler indices found the renal RI to be the only significant predictor of oligohydramnios: beta = -10.4186, P <.05 (odds ratio [95% confidence interval (CI)] = 0, 0.88). The renal artery RI was significantly higher in cases with oligohydramnios (RI: mean (+/-standard error) = 0.8843 +/- 0.11 versus 0.8601 +/- 0.05, P <or= 0.05). A renal artery Doppler end-diastolic velocity below the mean for gestation significantly increased the risk of oligohydramnios: relative risk (95% CI), 1.5 (1.1, 2.0). CONCLUSION: Renal artery Doppler was more predictive of oligohydramnios than the umbilical RI. The reduced renal artery end-diastolic velocity suggests that increased arterial impedance is an important factor in the development of oligohydramnios in prolonged pregnancies.

Adult↗
PubMed2002

Splenic artery Doppler in the prediction of the small-for-gestational age infant.

OBJECTIVES: We hypothesized that, as with other areas of the peripheral circulation, fetal splenic artery blood flow undergoes changes in small-for-gestational age (SGA) fetuses due to a redistribution of cardiac output, and that the Doppler peak systolic velocity (PSV) reflects such changes and thus may be used to predict fetuses being SGA. METHODS: Splenic artery Doppler PSV, end-diastolic velocity (EDV), resistance index (RI) and umbilical artery RI were measured prospectively in fetuses at risk for being SGA at birth. Normal reference data were generated from appropriately grown fetuses delivering at > or = 37 weeks without complications, and SGA was defined as birth weight < 10th percentile. The Doppler indices were expressed as multiples of the normal median (MoM) for gestational age. Using receiver operating characteristic curves, optimal Doppler thresholds for the detection of SGA cases were determined and the areas under the curves calculated. The analysis was limited to singleton pregnancies delivered within 2 weeks of the last Doppler examination. RESULTS: There were 88 study patients of which 60 had SGA babies. The mean gestational age at Doppler examination was 31.4 weeks with a mean interval of 5.6 days from Doppler to delivery. The splenic artery PSV was lower in SGA, compared to normal cases: mean PSV (MoM), 0.93 vs. 1.09, respectively (P = 0.0001). The sensitivity, specificity and area under the curve were 70.0%, 72% and 0.734, respectively (P < 0.003), for the PSV in the prediction of delivery of a SGA fetus. For the splenic artery RI, values were 70%, 46% and 0.539, respectively (not significantly different), and for umbilical artery RI these were 70%, 61% and 0.689, respectively (P < 0.01). Splenic artery EDV was significantly reduced in SGA vs. normally grown fetuses (0.924 MoM vs. 1.145 MoM, P = 0.007). CONCLUSIONS: Fetal splenic artery PSV decreases in SGA infants, and is a strong predictor of the delivery of a SGA infant. It appears to be superior to the standard Doppler index, the RI, in predicting this outcome.

Blood Flow Velocity↗
PubMed2001

The effect of steroids on the biophysical profile and Doppler indices of umbilical and middle cerebral arteries in healthy preterm fetuses.

OBJECTIVE: To examine the effect of antenatal steroids on the biophysical profile and the Doppler parameters of umbilical and middle cerebral arteries of healthy fetuses. STUDY DESIGN: Thiry-five singleton pregnancies between the gestational ages of 28 and 34 weeks, who received two consecutive doses of betamethasone 24h apart to accelerate pulmonary maturation were prospectively studied. Fetal biophysical profile and Doppler assessment were performed at 0 (pre-steroid), 24, 48, 72, 96 and 120 h after the administration of first dose. We compared the percentage of the fetuses with biophysical parameters present for each of the five components of the biophysical profile and the Doppler indices, using Cochran's Q-test, Friedman's test and one way analysis of variance of repeated measures where appropriate. The statistical significance was defined as P<0.05. RESULTS: The mean delivery time was 36.9(+/-1.8) weeks. There was a statistically significant difference in the frequency of the following findings in the pre- compared to post-steroid measurements: absence of body movements (48 h, P<0.05), non-reassuring fetal heart rate tracings (24, 48 and 72 h, P<0.05) and absence of breathing movements (24, 48 and 72 h, p<0.05). Initially none of the biophysical profile score was <or=6, whereas at 24, 48 and 72 h, 13.3, 76.7, 16.7% of them, respectively, were <or=6 (P<0.05). None of the Doppler indices was found to be affected by the steroid administration. CONCLUSION: Maternal betamethasone administration can cause a significant but transient, reduction in biophysical profile scores, however the middle cerebral and umbilical artery Doppler indices were found to be unaffected suggesting the reliability of this modality for the evaluation of the fetuses previously exposed to the antenatal steroids.

Adult↗
PubMed2001

Ratio of nuchal thickness to humerus length for Down syndrome detection.

OBJECTIVE: Ultrasonographic biometry markers are now being used clinically to adjust Down syndrome risk. The limitations are that the definitions of "abnormal" measurements used are arbitrary, thus reducing screening performance, and also that patient-specific Down syndrome risks cannot be calculated. We report a new ultrasonographic algorithm that is sensitive for Down syndrome detection and that estimates individual risk. STUDY DESIGN: Overall in fetal populations with Down syndrome the humerus length is decreased, whereas the nuchal thickness is increased relative to that of a normal population. The nuchal thickness/humerus length ratio therefore shows an even greater increase and magnifies the separation between Down syndrome and healthy groups. Prospective data were collected in midtrimester amniocentesis cases. A regression equation for the median nuchal thickness/humerus length ratio based on biparietal partial diameter was generated. The Down syndrome likelihood ratio, or the odds on the basis of the nuchal thickness/humerus length ratio (multiples of the median), was multiplied by the age-related risk to give the posterior Down syndrome risk. Charts for rapid estimation of individual Down syndrome risk on the basis of maternal age and the nuchal thickness/humerus length ratio were constructed. RESULTS: There were 94 cases of Down syndrome and 4700 cases in which the karyotype was normal. The mean (+/-SD) gestational age of the study population was 16.1 +/- 1.6 weeks. Thirty-three fetuses with Down syndrome and 68 karyotypically normal fetuses had gross anomalies. The equation for the expected median nuchal thickness/humerus length ratio was as follows: 10e(1.7163 - 0.0292) x BPD + 0.0003 x BPD2, where BPD is the biparietal diameter. In the overall study population the nuchal thickness/humerus length ratio and maternal age had a 79.8% detection rate at a 22.1% false-positive rate, compared with maternal age plus humerus length (sensitivity, 55.1%) or maternal age plus nuchal thickness (sensitivity, 66.7%) at the same false-positive rate. For women > or =35 years old the values were 80% and 22.0%, respectively. CONCLUSIONS: We report an ultrasonographic biometry algorithm that, in combination with maternal age, detects 79.6% of Down syndrome cases in a high-risk group. Individual Down syndrome risk can be quickly calculated at the bedside and made available to women who desire this information before making a decision on amniocentesis. On the basis of published standards, ultrasonographic biometry as described would be a cost-effective alternative to amniocentesis in this high-risk group.

Algorithms↗
PubMed2001

Perinatal morbidity and mortality rates in severe twin-twin transfusion syndrome: results of the International Amnioreduction Registry.

OBJECTIVE: Serial aggressive amnioreduction is the most widely used therapy for pregnancies that are complicated by twin-twin transfusion syndrome. Survival rates reported with this therapy are 33% to 83%, the wide range attributable to the small number of patients in these case series. Similarly, data on morbidity in survivors are imprecise. We instituted the international twin-twin transfusion syndrome registry to determine the perinatal survival and morbidity rates and the factors that influence perinatal outcome in patients with twin-twin transfusion syndrome who were treated with serial aggressive amnioreduction from 1990 to 1998. STUDY DESIGN: A total of 223 sets of twins who were diagnosed with twin-twin transfusion syndrome before 28 weeks' gestation from 20 fetal medicine referral centers were analyzed, with follow-up data until 4 weeks after birth. RESULTS: Three hundred forty-six twins (78%; 182 recipients and 164 donors) were born alive. Two hundred sixty-six twins (60%; 144 recipients and 122 donors) were alive 4 weeks after birth. Both fetuses survived to 4 weeks in 108 pregnancies (48.4%), whereas, at least 1 fetus survived in 158 pregnancies (70.8%). The interval between the last amnioreduction and delivery ranged from zero to 138 days (median, 17.5 days). In the infants who survived to 4 weeks after birth, abnormalities on neonatal cranial scan were diagnosed in 24% of recipients and in 25% of donors. Logistic regression analysis indicated that the survival rate was significantly related to gestational age at diagnosis, presence of end-diastolic blood flow in the umbilical artery velocity waveforms, presence of hydrops, mean volume of amniotic fluid removed per week, larger birth weight, and gestational age at delivery. The hemoglobin level difference at birth was the only significant parameter to predict abnormal cranial ultrasonography in newborns. CONCLUSION: These data document perinatal survival and neonatal morbidity rates in severe twin-twin transfusion syndrome that were treated by serial aggressive amnioreduction. Outcome was influenced by several perinatal risk factors, which may be used to counsel patients before and during therapy.

Amnion↗
PubMed2001

Doppler ultrasound velocimetry for timing the second intrauterine transfusion in fetuses with anemia from red cell alloimmunization.

OBJECTIVE: Middle cerebral artery peak systolic velocity has been successfully used for timing the first cordocentesis in fetuses who are at risk for anemia because of maternal red cell alloimmunization. The effects on Doppler velocimetry after the intrauterine transfusion of adult blood to these fetuses are unknown. The objective of this study was to assess the applicability of Doppler methods for the prediction of severe anemia in fetuses who had undergone 1 previous intrauterine transfusion. STUDY DESIGN: Doppler examination of middle cerebral artery peak systolic velocity was performed before cordocentesis in 64 fetuses who had undergone 1 previous intrauterine transfusion. Timing of the second intrauterine transfusion was based on traditional criteria. Anemia was defined as mild (hemoglobin value between 0.84 and 0.65 multiples of the median), moderate (hemoglobin value <0.65-0.55 multiples of the median), and severe (hemoglobin value <0.55 multiples of the median). Receiver operator characteristic curves were created to select threshold values to identify the 3 degrees of anemia with a sensitivity of 100%. RESULTS: Gestational age at the Doppler study ranged from 19 to 36 weeks. Forty-six fetuses (72%) were not or mildly anemic; 7 fetuses (11%) were moderately anemic, and 11 fetuses (17%) were severely anemic. Middle cerebral artery peak systolic velocity for the prediction of severe, moderate, and mild anemia at a sensitivity of 100% showed false-positive rates of 6%, 37%, and 70%, respectively. CONCLUSION: In fetuses who have undergone 1 previous intrauterine transfusion because of maternal red cell alloimmunization, timing the second intrauterine transfusion can be determined noninvasively by Doppler ultrasonography on the basis of an increase in the peak velocity of systolic blood flow in the middle cerebral artery.

Anemia↗
PubMed2000

Combined ultrasound biometry, serum markers and age for Down syndrome risk estimation.

OBJECTIVE: To compare Down syndrome screening efficiency of the standard serum triple analyte screen to that of a four-component screen consisting of ultrasound biometry and serum markers in the second trimester. METHODS: The Down syndrome screening efficiency of the triple screen, i.e. alpha-fetoprotein (AFP), unconjugated estriol (E3), hCG and maternal age, was compared with the four-marker algorithm, i.e. humerus length, nuchal thickness, AFP and hCG plus maternal age. A quadrivariate Gaussian algorithm was used to calculate individual Down syndrome odds. Receiver operating characteristic (ROC) curves plotting sensitivity against false-positive rate were constructed for each algorithm and the areas under the curves were compared to determine which was superior. Sensitivity and false-positive rates at different Down syndrome risk thresholds were also compared. RESULTS: There were 46 cases of Down syndrome (1.9%) with 2391 normal singleton pregnancies in a referral population in which triple screen, fetal biometry and karyotype had been done. The gestational age range for the study was 14-24 completed weeks. The median maternal age for the study group was 35.0 years (14.0-46.0 years). The areas (SE) under the ROC curves were 0.75(0.04) and 0.93(0.02) for the standard triple and the four-marker screen, respectively (P < 0.001). At a 10% false-positive rate, detection was 45.7% for the triple and 80.4% for the four-marker screen. CONCLUSIONS: A new algorithm combining humerus length and nuchal thickness measurement with serum AFP, hCG and maternal age substantially improved Down syndrome screening efficiency compared with the traditional triple screen. The model appears promising and should be evaluated in an independent data set.

Adolescent↗
PubMed2000

Middle cerebral artery Doppler velocimetric deceleration angle as a predictor of fetal anemia in Rh-alloimmunized fetuses without hydrops.

OBJECTIVE: The purpose of this study was to evaluate the screening performance of a new middle cerebral artery Doppler velocimetric index for the prediction of fetal anemia. STUDY DESIGN: Doppler velocimetry of the middle cerebral artery was performed before cordocentesis in 24 Rh-alloimmunized fetuses without hydrops on 52 occasions. The angle between the line describing the average slope during the diastolic phase of the cardiac cycle and the vertical, the middle cerebral artery standardized deceleration angle, was measured. The deceleration angle values were expressed in multiples of the median for gestational age. The screening performances of deceleration angle for the prediction of anemia (difference between expected mean hemoglobin level and measured value >/=2 g/dL) and severe anemia (hemoglobin deficit >/=5 g/dL) were determined. RESULTS: The mean (+/-SD) gestational age at cordocentesis was 28.6 +/- 5.7 weeks' gestation. The risk of fetal anemia increased with decreasing deceleration angle values. The sensitivity and false-positive rate for the detection of anemia in cases with no previous transfusions (one measurement per patient) were 72.0% and 13.3%, respectively; among those with one previous transfusion the values were 90.0% and 0.0%, respectively. For severe anemia the corresponding values were 100% and 0%, respectively, among those with no previous transfusions and 100.0% and 16.7%, respectively, among those with one previous transfusion. There was no risk of severe anemia when the angle was >0.9 multiples of the median. The risk of anemia was significantly reduced with an angle greater than the median for gestational age (deceleration angle >1.0 multiples of the median; relative risk, 0.09; 95% confidence interval, 0.02-0.37). The risk was significantly increased with an angle less than the median for gestational age (deceleration angle <1.0 multiples of the median; relative risk, 30.0; 95% confidence interval, 5.9-158.4). CONCLUSION: The risk of fetal hydrops is remote in the absence of severe anemia. With a new Doppler velocimetric index in the middle cerebral artery the risk of severe anemia was found to be low when the deceleration angle was >0.9 multiples of the median. Anemia can also be predicted with this index. The high sensitivities and acceptable false-positive rates support the potential clinical applicability of the method to reduce the reliance on cordocentesis in Rh alloimmunization. Our findings appear to validate the utility of the deceleration angle for the prediction of fetal anemia.

Anemia↗
PubMed2000

Comparison of urinary hyperglycosylated human chorionic gonadotropin concentration with the serum triple screen for Down syndrome detection in high-risk pregnancies.

OBJECTIVE: Both modest screening performance and declining patient and physician acceptance have stimulated interest in alternative markers to the triple screen for the detection of Down syndrome. Our purpose was to compare the concentration of a single urinary analyte, hyperglycosylated human chorionic gonadotropin, with the serum triple screen (alpha-fetoprotein, human chorionic gonadotropin, and unconjugated estriol concentrations combined with age) for second-trimester Down syndrome detection. STUDY DESIGN: Urine and blood were obtained from pregnant women in the second trimester undergoing genetic amniocentesis. Urinary hyperglycosylated human chorionic gonadotropin concentration and serum triple-screen values were measured. Individuals undergoing amniocentesis because of abnormal triple-screen results were excluded. Individual Down syndrome risks on the basis of urinary hyperglycosylated human chorionic gonadotropin concentration plus maternal age and on the basis of the triple-screen results were calculated. For each algorithm the sensitivity and false-positive rate for Down syndrome detection at different risk thresholds were determined. From these values receiver operating characteristic curves were constructed, and the area under the curve was determined for each algorithm. Finally, the performance of a new combination in which urinary hyperglycosylated human chorionic gonadotropin concentration replaced serum human chorionic gonadotropin concentration in the triple screen was ascertained. RESULTS: We studied 24 pregnancies complicated by Down syndrome and 500 unaffected pregnancies between 14 and 22 weeks' gestation in a mostly white (93.5%) population undergoing amniocentesis primarily because of advanced maternal age. The sensitivity and false-positive rate for urinary hyperglycosylated human chorionic gonadotropin concentration were 75. 0% and 5.6%, respectively, whereas those for the triple screen were 75.0% and 33.2%, respectively. Urinary hyperglycosylated human chorionic gonadotropin concentration was superior to the triple screen (area under the curve, 0.9337 vs 0.7887; P =.02). The substitution of urinary hyperglycosylated human chorionic gonadotropin concentration for serum human chorionic gonadotropin concentration in the triple screen resulted in a 91.7% sensitivity at a 10.0% false-positive rate, versus a 54.2% sensitivity for the traditional triple screen at the same false-positive rate. CONCLUSION: The performance of urinary hyperglycosylated human chorionic gonadotropin concentration was statistically superior to that of the serum triple screen in a high-risk population. The use of urinary hyperglycosylated human chorionic gonadotropin concentration as an alternative test or substitution of this measurement for serum human chorionic gonadotropin concentration in the triple screen would improve diagnostic accuracy and address many current concerns related to the triple screen.

Chorionic Gonadotropin↗
PubMed1999

Urinary screening tests for fetal Down syndrome: I. Fresh beta-core fragment.

Variable results have been reported using urine beta-core fragment as a marker for fetal Down syndrome. Initial studies by Cuckle et al. (1994) and Canick et al. (1995) indicated that beta-core fragment was an outstanding marker, detecting >80 per cent of Down syndrome cases. Since these reports, widely varying results have been published, indicating between 20 per cent and 66 per cent detection of cases at 5 per cent false-positive rate. The wide variation in the reported data has led to a loss of enthusiasm for this marker as a useful test for Down syndrome screening. Here we report the results of a three-year prospective study in which urine samples were collected daily from women undergoing fetal karyotype analysis for advanced maternal age. Samples were tested within one week of collection and then frozen. We also investigated the likely causes of the variability observed in beta-core fragment data. We collected 1157 urine samples over 955 days. Beta-core fragment levels were measured. A regression line was calculated for the weekly medians of the 1134 control samples and multiples of the control median (MoM) were determined. The median MoM for the controls was 1.0 and the logarithmic standard deviation (log SD) was 0.41. The median MoM for the 23 Down syndrome cases was 5.44 and the log SD was 0.45. Over the study period, 65 per cent of Down syndrome cases exceeded the 95th centile of the control group. The median MoM of control samples and the proportion of Down syndrome cases detected by the test was relatively constant during the study period. The unaffected cases were divided into three equal divisions, corresponding to approximately the first, second and third year of sample collection. No trend was found in the median control MoM values in three sample collection periods (r2=0.04). A similar number of cases exceeded the 95th centile of control samples in the three sample collection periods, 63 per cent, 66 per cent and 66 per cent. Consistent results were indicated during the three years of sample testing. Levels of total oestriol were determined in urine samples and MoM statistics derived. The median oestriol level in Down syndrome cases was 0.59 MoM. Only 12 per cent of cases had MoM levels below the fifth centile. Gaussian models were prepared combining biochemical data and maternal age distribution. While beta-core fragment by itself detected 65 per cent of Down syndrome cases, beta-core fragment modelled with maternal age detected 66 per cent, and modelled with age and total oestriol levels detected 82 per cent of cases at 5 per cent false-positive rate. At the completion of the study, we thawed and reassayed 20 random urine samples (10 control and 10 Down syndrome) collected at different times during the study period. While the control samples (74-1700 ng/ml) had slightly increased values when reassayed (mean value 137 per cent of original prospective value), the Down syndrome samples (360-20,500 ng/ml) all had decreased values when reassayed (mean=53 per cent, t-test, controls versus cases, p = 0.0003). The Down syndrome samples were decreased to between 93 per cent and 12 per cent of the original value. A relationship was identified between the magnitude of the original beta-core fragment value and the change in immunoreactivity when reassayed (r2=0.998). The higher the initial beta-core fragment value the greater the loss of immunoreactivity. We considered the possibility that the beta-core fragment molecules aggregate upon storage in the freezer. We repeated the assay of the 20 samples after treatment with a high salt buffer. Down syndrome samples recovered half of the lost beta-core fragment immunoreactivity (mean increase in beta-core fragment levels 56 per cent, t-test, controls versus cases, p=0.004). We infer that aggregation of beta-core fragment upon storage interferes with beta-core fragment measurements. This may be the cause of the poor beta-core fragment screening performance reported using sto

Biomarkers↗
PubMed1999

Nuchal thickness, urine beta-core fragment level, and maternal age for down syndrome screening.

OBJECTIVE: Our purpose was to report the midtrimester Down syndrome screening efficiency of a 2-analyte algorithm, urine beta-core fragment (a metabolite of human chorionic gonadotropin) and nuchal thickness, along with maternal age in a high-risk population undergoing genetic amniocentesis. METHOD: Nuchal thickness, humerus length, and maternal urine beta-core fragment levels were measured prospectively before genetic amniocentesis in 1360 singleton pregnancies, 21 (1.5%) of which had fetal Down syndrome. All analyte levels were expressed as multiples of the normal medians based on biparietal diameter. Backward-stepwise logistic regression was used to determine whether the markers were significant independent predictors of fetal Down syndrome. Matrix analysis was used to calculate an adjusted Down syndrome likelihood ratio for each patient based on the significant screening markers. Multiplication by age-related midtrimester risk gave the adjusted Down syndrome risk. The sensitivity and false-positive rates at different Down syndrome screening thresholds were used to generate a receiver-operator characteristics curve. The area under the curve was used to assess the value of this screening test. RESULTS: On the basis of logistic regression, beta-core fragment level (P 1/60 the sensitivity and false-positive rate for Down syndrome were 85.7% and 4.9%, respectively, when beta-core fragment level, nuchal thickness, and maternal age were used. Correspondence screening values at a risk threshold > 1/150 were 95.2% and 10.8%, respectively. The area under the receiver-operator characteristics curve was 0.9357 (SE = 0. 0137), indicating that the algorithm is excellent for Down syndrome screening. CONCLUSION: In this study, a combination algorithm consisting of nuchal thickness, urine beta-core fragment level, and maternal age had a high screening efficiency for Down syndrome. This algorithm should be investigated as a new option for women at high risk of having a fetus with Down syndrome.

Adolescent↗
PubMed1999

The Doppler cerebroplacental ratio and perinatal outcome in intrauterine growth restriction.

OBJECTIVE: Our purpose was to determine whether the Doppler cerebroplacental ratio predicts perinatal outcome in fetuses at risk for intrauterine growth restriction. STUDY DESIGN: The middle cerebral and umbilical artery pulsatility index values were measured in 203 fetuses at risk for intrauterine growth restriction, of which 123 were delivered <3 weeks after the last Doppler examination. Perinatal outcome was categorized as (1) birth weight <10th percentile, (2) birth weight <5th percentile, (3) perinatal complications (meconium-stained fluid, cesarean section for fetal distress, 5-minute Apgar score <7, perinatal death, neonatal intensive care unit stay >24 hours, hypoglycemia, or polycythemia), (4) birth weight <10th percentile plus complications, and (5) birth weight <5th percentile plus complications. The cerebroplacental ratio (middle cerebral artery pulsatility index divided by umbilical artery pul-satility index) values were expressed as multiples of the normal median. Receiver-operator characteristic curves (sensitivity vs false-positive rates) were plotted for the prediction of each category of perinatal outcome and the areas under the curves were determined. Stepwise logistic regression analyses were used to determine whether the cerebroplacental ratio improved outcome prediction over umbilical artery Doppler imaging alone. RESULTS: There was a statistically significant increase in perinatal morbidity and mortality in cases with an abnormal cerebroplacental ratio. The areas under the receiver-operator curves characteristics for the prediction of perinatal outcome with use of the cerebroplacental ratio were statistically very significant. For birth weight <10th percentile we noted P <.001, with P <.0001 for each of the other 4 outcome categories. As shown by regression analyses, the cerebroplacental ratio appeared to improve the prediction of perinatal outcome compared with umbilical artery velocimetry alone. An interesting finding was that the cerebroplacental ratio did not appear to correlate significantly with outcome in fetuses at >34 weeks. CONCLUSION: Doppler identification of the fetal "brain-sparing" effect strongly predicts outcome in fetuses at risk for intrauterine growth restriction. The brain-sparing effect predicted perinatal problems only in fetuses <34 weeks' gestation at the Doppler examination.

Birth Weight↗
PubMed1999

Pseudoaneurysm of the uterine artery.

BACKGROUND: Preexisting aneurysms in several arterial locations have been associated with an increased risk of rupture in pregnancy. We report a rare case of uterine artery pseudoaneurysm that presented during the puerperium. CASE: A 31-year-old woman had moderate suprapubic pain on postpartum day 8. The diagnosis of uterine artery aneurysm was made by duplex Doppler sonography and confirmed by arteriography. It was successfully treated by embolization of the left uterine artery. CONCLUSION: In a rare case of pseudoaneurysm of the uterine artery, the complications of pregnancy-related aneurysmal rupture were prevented by prompt sonographic diagnosis and embolization therapy.

Adult↗