Biomedical subjects

M Metzenbauer

Publications and source records attributed to M Metzenbauer.

14 recordsLinked to original sources

PubMed2006

Comparison between three-dimensional placental volume at 12 weeks and uterine artery impedance/notching at 22 weeks in screening for pregnancy-induced hypertension, pre-eclampsia and fetal growth restriction in a low-risk population.

OBJECTIVES: To compare the value of three-dimensional placental volume at 12 weeks and uterine artery Doppler at 22 weeks for predicting pregnancy-induced hypertension (PIH), pre-eclampsia and fetal growth restriction in a low-risk population. METHODS: Over a 20-month period we calculated the placental quotient (PQ = placental volume/crown-rump length) at 11-13 weeks' gestation in all women with singleton pregnancies who booked for delivery in our hospital. At 22 weeks, in the same population, we calculated the mean pulsatility index (PI) of both uterine arteries and the presence of an early diastolic notch was noted. Logistic regression models, the PQ and Doppler parameters were used to compare the two screening methods for subgroups of pregnancy outcome. RESULTS: Complete outcome data were obtained in 2489 consecutive singleton pregnancies. Logistic regression models for the detection of pre-eclampsia had a sensitivity of 38.5% (PQ) vs. 44.8% (Doppler); for the detection of small-for-gestational age (SGA) the sensitivity was 27.1% (PQ) vs. 28.1% (Doppler) at a specificity of 90%. Taking a PQ of or= 90th centile and a bilateral notch, the sensitivity for detection of SGA was 25.0%, 20.2% and 22.0%, respectively; for PIH it was 9.5%, 4.8% and 4.8%; for pre-eclampsia without SGA it was 20.0%, 28%, 12%; for PIH/pre-eclampsia with SGA it was 30.8%, 46.1% and 69.2%. In the group with the most severe complications, in which delivery took place before 34 weeks, the sensitivity was 50.0%, 50.0% and 38.9%, respectively. CONCLUSIONS: PQ at 12 weeks and uterine artery Doppler at 22 weeks have similar sensitivities for predicting pre-eclampsia and fetal growth restriction, although uterine artery Doppler is marginally more sensitive for the prediction of pre-eclampsia. While both methods are insufficient for screening in a low-risk population, the PQ method has the potential advantage of being performed in the first trimester.

Adolescent↗

PubMed2003

Increased nuchal translucency and congenital heart defects in a low-risk population.

OBJECTIVE: Increased first-trimester nuchal translucency (NT) is a possible marker for congenital heart defects in euploid fetuses. In this study, we wanted to determine the sensitivity for congenital heart defects using the 95th centile of the NT as a cut-off point. METHODS: All women who booked for delivery in our hospital in the first trimester underwent NT measurement at a crown-rump length (CRL) of between 35 and 75 mm. In all euploid fetuses and newborns with isolated or associated CHD, NT was examined retrospectively and classified as normal (<95th centile according to CRL-dependent centiles in our own data) or increased (> or =95th centile). RESULTS: From a total of 12,978 euploid fetuses screened, 27 had CHD (22 isolated and 5 cases associated with additional malformations). Moreover, 7 of the 27 fetuses also had increased NT (26%). Increased NT was significantly more frequent in fetuses with associated CHD (4/5) than in those with isolated CHD (3/22, Yates corrected chi2 p=0.012). In fact, the relative risk for CHD was 6.6 times higher in fetuses with increased NT compared to those with normal NT. CONCLUSION: Increased NT for the detection of CHD performed less well than in other studies. Nevertheless, it can be used as an indication for fetal echocardiography.

Adolescent↗

PubMed2003

Placental growth from the first to the second trimester of pregnancy in SGA-foetuses and pre-eclamptic pregnancies compared to normal foetuses.

The aim of this study was to determine placental growth between 12-22 weeks in normal pregnancies compared to pregnancies complicated by foetal SGA and maternal pre-eclampsia (PE). The placentae of 1199 women were measured 3D sonographically at 12, 16 and 22 weeks of gestation. Placental volume growth was then calculated. Neonatal birthweight, birth centile and the occurrence of pre-eclampsia were recorded in every woman and correlated with placental growth (four groups: normals, SGA, PE, SGA+PE). SGA-placentae are already smaller at 12 weeks but then develop in a similar way to normal placentae. PE placentae are slightly, but significantly, larger at 12 weeks, grow rapidly until 16 weeks and then stop growing normally between 16 and 22 weeks. If SGA goes together with PE, both placental volume (PV) at 12 weeks as well as growth is reduced significantly. Nevertheless, placental growth between week 12 and 22 is too heterogeneous to justify using this method as a clinical tool, but it can provide new information on placental physiology underlying unfavourable obstetric outcomes.

Adult↗

PubMed2002

The first trimester 'combined test' for the detection of Down syndrome pregnancies in 4939 unselected pregnancies.

The high detection rate (DR) for Down syndrome (DS) pregnancies which can be achieved by measuring fetal nuchal translucency (NT) early in pregnancy can be improved by combining it with placental hormones [pregnancy-associated plasma protein A (PAPP-A) and free beta-human chorionic gonadotrophin (fbeta-hCG)] and maternal age ('combined test'). In this study we wanted to assess the DR using the 'combined test' in an unselected population of self-referred pregnant women at a false-positive rate (FPR) of about 5%. NT, PAPP-A, fbeta-hCG and maternal age were measured in all women with singleton pregnancies who booked for delivery in our hospital from 1 December 1997 to 31 April 2000 and who were between 10 and 13 completed weeks of gestation [crown-rump length (CRL) 35-70 mm]. The specific DS risk was calculated using the computer program Alpha Version 5aa (Logical Medical Systems, London, UK). A total of 4939 women were tested. Out of 14 DS pregnancies that occurred during this period of time, 12 were detected with the test. A total of 246 women had a false-positive test result in a non-DS pregnancy (FPR 5.0%). This makes the 'combined test' by far the best test for the detection of DS pregnancies in a low-risk population. The constant increase in maternal age at the time of delivery can also lead to an improved DR if a simple age-dependant protocol for DS detection is used, but only at the price of a much higher number of amniocenteses and subsequent abortions. The DR for DS can be increased much more markedly using the 'combined test' with a FPR that still remains at the level as it was in the early 1970s.

Abortion, Spontaneous↗

PubMed2002

First-trimester placental volume as a marker for chromosomal anomalies: preliminary results from an unselected population.

OBJECTIVE: To compare first-trimester placental volume in chromosomally abnormal and normal pregnancies. METHODS: Placental volumes were routinely recorded at the time of nuchal translucency thickness measurement at 10-13 weeks of gestation. This was done using customized three-dimensional ultrasound equipment and measurements were then converted to the placental quotient (placental volume/fetal crown-rump length). The possible difference in placental quotient between chromosomally normal and abnormal pregnancies was examined. RESULTS: A total of 2863 pregnancies was evaluated, including 17 with major chromosomal defects (nine cases of trisomy 21, four of trisomy 18, two of trisomy 13, and one each of Turner syndrome and 48,XXY + 21). The median placental quotient in the chromosomally abnormal group (0.67) was significantly lower than that in the normal fetuses (0.98). In nine of the 17 affected pregnancies the quotient was below the 10th centile of the normal range. CONCLUSIONS: Assessment of placental volume may prove to be useful in first-trimester risk assessment for chromosomal anomalies.

Adolescent↗

PubMed2001

Uterine artery Doppler and placental volume in the first trimester in the prediction of pregnancy complications.

OBJECTIVE: To evaluate placental volume and uterine artery Doppler in the first trimester in the prediction of pregnancies that subsequently develop pre-eclampsia, pregnancy-induced hypertension, preterm placental abruption or fetal growth restriction. METHODS: In 380 singleton pregnancies attending our center for nuchal translucency screening at 11-14 weeks of gestation, Doppler assessment of both uterine arteries was carried out for measurement of the pulsatility index and the mean pulsatility index of the two vessels was calculated. In addition, three-dimensional ultrasound was used to obtain images for subsequent measurement of placental volume. The 90th centile of the uterine artery mean pulsatility index and the 10th centile of the placental volume for crown-rump length (placental quotient) were calculated. These cut-offs were used for the prediction of pregnancy complications. RESULTS: Complications occurred in 36 (9.5%) of the 380 pregnancies, including 31 cases of fetal growth restriction, two of pregnancy-induced hypertension and abruption, two of pregnancy-induced hypertension, and one of abruption. The uterine artery mean pulsatility index was > or =90th centile in 38 (10%) pregnancies and this group contained nine (25%) of those that developed complications. The placental quotient was < or =10th centile in 39 (10%) pregnancies and this group contained eight (22%) of those that developed complications. In eight (2%) pregnancies the uterine artery mean pulsatility index was > or =90th centile and the placental quotient was < or =10th centile and this group contained six (17%) of those that developed complications. CONCLUSION: The combination of placental volume measurement and uterine artery Doppler in the first trimester may identify women at risk for subsequent development of pregnancy complications.

Female↗

PubMed2001

Three-dimensional sonographic volumetry of the placenta and the fetus between weeks 15 and 17 of gestation.

OBJECTIVES: Three-dimensional sonographic volume measurement enables for the first time direct comparison of the increase in size of different but closely interacting structures like the placenta and fetus. Our aim was to calculate the fetal and placental volumes between weeks 15 and 17 of gestation, to monitor the difference in the increase of the fetal and placental sizes and to determine their mutual relationship. METHODS: Fetal and placental sonographic volume measurements were made in 356 singleton pregnancies. To measure the relationship between fetal and placental volumes, a quotient was calculated. Regression analyses were performed to analyze the dependence of the fetal and placental volumes and placental quotient on the week of gestation and other influencing variables. RESULTS: The mean of the fetal volume increased markedly from 67.8 to 76.6 mL (by 13%) within the 3 weeks of observation, whereas placental volume increased only slightly (111.1 to 114 mL (by 2.6%)). The random variation of placental volumes around the mean in all three gestational weeks was considerably higher than that of fetal volumes, indicating that in this early period of gestation there is little correlation between fetal and placental sizes. Fetal volume correlated better to gestational week than did placental volume. CONCLUSION: The quotient of fetal and placental volume might assist in the diagnosis of high-risk pregnancies and the assessment of a normal or large fetus with a small placenta.

Anthropometry↗

PubMed2001

Three-dimensional ultrasound measurement of the placental volume in early pregnancy: method and correlation with biochemical placenta parameters.

Placental size has been an interesting topic of research for many years. The main aim of this study was to investigate the feasibility of measuring the placental volume at the end of the first trimester using three-dimensional (3D) ultrasound and to correlate these volumes to known placental functional indices and to factors affecting the placenta. Women with singleton pregnancies at the end of the first trimester were included into this study. The volume data of the placentae were correlated to the crown-rump length (CRL), placenta-associated plasma protein A (PAPP-A), free beta-human chroangiogonadotropin (f-beta-hCG) and other factors that may affect the placental size or function. A total of 1462 pregnancies could be evaluated. Comparison between CRL and placental volume proved a significant correlation (r=0.43, P< 0.001). Due to the observed proportional growth of CRL and placental volume, a quotient (placental volume/CRL) was calculated for each case. There were no differences between placenta/CRL-quotients in relation to gravidity, parity or smoking. Correlations could be established between the placental volume and PAPP-A and f-beta-hCG (PAPP-A: r=0.28, P< 0.001, f-beta-hCG: r=0.10, P< 0.001). The measurement of the placenta in the first trimester can be performed in a high percentage of cases. The placenta/CRL quotient represents a simple method to compare placentae from different gestational days. The correlation between placental volume and maternal serum screening parameters might provide a chance to refine first trimester Down's syndrome serum screening. Future studies will be needed to evaluate the possible clinical use of first trimester placental volume measurements.

Chorionic Gonadotropin, beta Subunit, Human↗

PubMed2000

p53 expression in fallopian tube carcinomas.

Sixty-three women treated for primary carcinoma of the fallopian tube (PFTC) from 1980-1995 were retrospectively analyzed to study the impact of p53 expression on survival in primary carcinoma of the fallopian tube. The mean age of the patients was 61.2 years (range 37.3-80.2). Twenty-four (38%) patients were FIGO stage I, 11 (18%) stage II, 19 (30%) stage III and nine (14%) stage IV. Complete radical resection was achieved in 45 (71%) patients. In 56 (89%) women, surgery involved removal of the uterus, the adnexa, and/or the omentum or lymph nodes. Adjuvant therapy consisted of either chemotherapy (n: 31; 49%) or irradiation (n: 21; 33%). The 5-year survival rate for all cases was 43%. For stages I+II and III+IV the 5-year survival rate was 59 and 19%, respectively (P<0.00001). Twelve samples (19%) were p53-negative (tumours with <10% of nuclear staining) and 51 (81%) samples were p53 positive tumours with >10% of nuclear staining. The median survival for the p53-negative group was 40 and 21 months for the p53 positive group. No statistical significance between p53 expression and different FIGO stages was observed, however, a trend for a slightly better survival for the p53-negative group was observed.

Adult↗

PubMed2000

Uterine artery Doppler perfusion in the first and second pregnancies.

OBJECTIVE: To compare blood perfusion expressed as pulsatility index (PI) and 'notching' of the left and right uterine arteries measured in the same woman in her first and second pregnancies. METHODS: Data from 1102 women's uterine perfusion in their first and second pregnancies were evaluated. Bilateral data, PI and early diastolic notch in both pregnancies were collected. A notch and a PI > or = 1 were deemed to be pathologic. Statistical mean and standard deviation together with the frequency of pathological uterine perfusion in the first and second pregnancies were compared (t-test, chi 2-test). RESULTS: PI values did not differ significantly in the first and second pregnancies whereas there was a small but marked difference in the right uterine artery compared to the left. Early diastolic notch behaved differently, being more frequently found in the first pregnancy. This discrepancy was highly significant. However in subsequent pregnancies a notch was found more frequently on the left than on the right side. Women with pathologic flow patterns in the first pregnancy were significantly more likely to develop pathologic flow patterns in their second pregnancy. CONCLUSION: Although uterine perfusion in the same woman is similar in the first and second pregnancies, 'notching' appears much more frequently in the first pregnancy reflecting the fact that the decidual embedding of the trophoblast is less problematic in the second pregnancy. Nevertheless the subgroup with an early diastolic notch in their first pregnancy is four times more likely to develop a notch in a second pregnancy.

Arteries↗

PubMedDate not supplied

The influence of leptin on placental and fetal volume measured by three-dimensional ultrasound in the second trimester.

For a couple of years mechanisms influencing placental and fetal growth and the functioning of leptin, the protein product of the ob/ob gene, have been subjects of intensive research. This study's aim was to investigate whether maternal serum leptin and amniotic fluid leptin have an influence on placental and fetal size measured by three-dimensional ultrasound in the second trimester. To determine this, 40 women with a singleton intrauterine pregnancy at the time of the amniocentesis were included in the study. Placental and fetal volume measurements were obtained and correlated to maternal serum leptin, amniotic fluid leptin, body mass index and gestational age. Multiple regression analysis identified amniotic fluid leptin as an independent negative predictor of placental and fetal volume (r = -2.29, p = 0.032 and r = -0.95, p = 0.011, respectively). In contrast, there was no correlation between maternal serum leptin and placental or fetal volume. The median leptin level in amniotic fluid (9.5 ng/ml) was significantly lower than in maternal blood (18.6 ng/ml). However, there was no significant correlation between maternal serum leptin and amniotic fluid leptin (r = 0.208, n.s.). Body mass index did not reveal any significant influences on placental or fetal volume. The relatively high level of amniotic fluid leptin and its inverse correlation on placental and fetal volume in the second trimester suggest that it possibly plays a role as an anti-placental growth hormone or feedback modulator of substrate supply to the fetus and placenta.

Adult↗

PubMedDate not supplied

Correlation of first trimester placental volume and second trimester uterine artery Doppler flow.

Uterine artery Doppler examination can identify impaired trophoblast invasion in the second trimester of pregnancy. High resistance and an early diastolic 'notch' show insufficient physiological conversion of the spiral arteries. Uterine artery Doppler is routinely performed between 22-24 weeks which is relatively late for treatment. In this study we wanted to find out whether women with increased uterine blood flow resistance at 22 weeks already have reduced placental volumes in the first trimester measured with 3D sonography.A total of 1060 women with singleton pregnancies had three dimensional (3D) volume measurements of their placentae between 11-13 weeks and uterine Doppler scans between 21-22 weeks. Stepwise logistic and linear regression analyses were used to show a correlation between placental volume (PV) and a CRL dependent placental quotient (PQ) with uterine perfusion parameters. Uterine perfusion at 21-22 weeks depends significantly on PV or PQ at 11-13 weeks (P< 0.0001 for both) and smoking behaviour (P=0.006). The occurrence of a notch also depends significantly on PV and PQ (P< 0.0001 for both) and also on gravidity (P< 0.0001) and age (P=0.0007) as well as on smoking behaviour (P=0.0094). PV and PQ did not show any dependency on age, gravidity, BMI or smoking habits. Placentae of women with high resistance uterine perfusion in the second trimester are already remarkably small in the first trimester. Placental volumetry is probably an efficient method for early and simple identification of impaired trophoblast invasion.

Age Factors↗

PubMedDate not supplied

[Combined test in the first trimester of pregnancy in 3,316 unselected pregnant patients for diagnosing Down syndrome].

UNLABELLED: The high detection rate (DR) for Down syndrome pregnancies which can be achieved by measuring fetal nuchal translucency (NT) early in pregnancy can be improved by combining it with placental hormones (PAPP-A, f beta hCG) and maternal age ("combined test"). In this study we wanted to assess the DR using the "combined test" in an unselected population of self-referred pregnant women at a false positive rate (FPR) of about 5%. MATERIALS AND METHODS: NT, PAPP-A, f beta hCG and maternal age were measured in all women with singleton pregnancies who booked for delivery in our hospital from 1.12.97 to 31.12.99 and who were between 10 and 13 completed weeks of gestation (crown-rump-length 35-70 mm). Calculation of the specific Down risk was done with the computer program Alpha, Version 5aa (Logical medical systems, London). RESULTS: A total of 3316 women were tested. Out of 10 Down pregnancies, which occurred in this period of time 9 could be detected with the test. 137 women had a positive test result but a non-Down pregnancy (FPR 4.1%). CONCLUSIONS: The combined test is an excellent test for the detection of Down syndrome pregnancies in a low-risk population. DISCUSSION: The constant increase in maternal age at the time of delivery can also lead to an improved DR if a simple age dependant protocol for Down-detection is used, but only at the price of a much higher number of amniocenteses and subsequent abortions. The DR for Down syndrome can be increased much more markedly using the "combined test" at a much lower FPR (approximately 5%).

Abortion, Eugenic↗

PubMedDate not supplied

[Associations between birth weight and placental volume in the first trimester].

INTRODUCTION: Associations between the size of the placenta and birth weight have been described before. This connection has also been found in (sonographically estimated) second trimester placental size. The aim of this study was to find out if there are any differences in first trimester placental volume between various birth weight groups. METHODS: Placental volume was obtained from non-smoking women at the end of the first trimester during a period of eight months. After birth, the newborns were divided into four groups: below the 10th, 10th to 50th 50th to 90th and above the 90th centile. As is known from previous research, placenta size changes in proportion to crown-rump-length. Therefore, the medians of the "placenta quotients" (placental volume/CRL) of each group were compared in order to correct for differences in gestational age. RESULTS: Data from 1476 pregnancies could be evaluated. The overall median of the placenta quotient was 0.98. It was 0.85 in the group below the 10th, 0.92 between 10th and 50th, 1.02 between 50th and 90th and 1.10 above the 90th centile (p < 0.0001, median test). DISCUSSION: The finding of associations between early pregnancy placental size and birth weight at term gives hope for the development of new diagnostic methods for the recognition of placenta-associated problems. Further research is required to estimate the clinical possibilities for the detection of pregnancies at risk of severe growth retardation and other conditions.

Austria↗