Twins' temperament: early prenatal sonographic assessment and postnatal correlation.

OBJECTIVE: To study inter-twin differences in activity during early pregnancy and to examine their relationship to subsequent infant twins' temperament. STUDY DESIGN: Measures of fetal motor activity (frequency, duration and number of movements) were collected from 26 twin pairs during ultrasound nuchal translucency scan at late first trimester and early second trimester (11 to 14 weeks gestation). In twenty-two patients, the twins were dizygotic (dichorionic); of them, 13 twin pairs were of different sexes, five were both females and four were both males. Of the four monozygotic twin pregnancies, two were dichorionic and two were monochorionic, three were both females.The more active fetus in each pair was noted according to the position and/or sex without reporting to parents. Reported maternal perception of the more active twin was documented at the mid-trimester anatomical scan. Maternally reported postnatal temperament data of the infants were collected at 3 and 6 months, using Rothbarts' Infant Behavior Questionnaire (IBQ). RESULTS: After birth, maternal reports on infants' temperament and the more active twin in each pair were in good correlation with prenatal inter-twin differences in activity. The receiver operating characteristic (ROC) curves shows a better performance of ultrasound compared with maternal perception in prediction of the more active twin. CONCLUSIONS: The features of fetal neurobehavioral activity provide the basis for individual differences in twins' activity in infancy. Differences in activity in early pregnancy even before the emergence of fetal behavioral patterns were followed by temperamental differences postnatally.

Fetal cerebrovascular circulation: a review of prenatal ultrasound assessment.

Antenatal intrauterine cerebrovascular events were found to play an important role in the pathogenesis of perinatal brain damage. Changes in placental vascular resistance, cardiac contractibility, vessel compliance, and blood viscosity alter the normal dynamics of fetal cerebral circulation. The circulatory mechanisms described in animal fetuses also operate in the human fetus. The isthmus of the aorta represents a watershed area reflecting the redistribution of blood during increased peripheral resistance and hypoxia. The fetal cerebrovascular system acts locally within the skull and interacts with the other components of fetal circulation to compensate by redistribution of blood in case of shortage in resources. The introduction of various sonographic techniques and the collection of data from the arterial and venous cerebral circulation have improved our understanding of the regulatory mechanisms involved in fetal cerebral hemodynamic events. Anatomical and physiological considerations of cerebral vasculature in health and disease are relevant in the research of variations in fetal brain blood perfusion. Changes in flow characteristics in fetal cerebral vasculature can be used for clinical decisions. However, caution is advised before applying research data into practice. The clinical utility is well established in situations of fetal compromise such as growth restriction and anemia.

Complication of laparoscopic detorsion of adnexal mass.

Detorsion of an ischemic adnexal mass has recently been advocated for most cases of twisted adnexa. Usually, the affected ovary regains some or all of its vitality and function. However, when the ovary is completely necrotic, it may form an abscess if it contains tissue components that cannot be eliminated by the peritoneal immune system. We report a case of pelvic abscess formation in a detorsed ovary that previously contained an unsuspected dermoid cyst. We call for an extensive inspection of the detorsed ovary before ending the laparoscopic operation, and if it remains necrotic and is suspected of containing a dermoid cyst, it should be removed promptly.

Three-dimensional power Doppler in the evaluation of painful leiomyomas and focal uterine thickening in pregnancy.

OBJECTIVE: To determine the usefulness of 3-dimensional (3D) power Doppler ultrasound in distinguishing painful leiomyomas from focal myometrial contractions or nonpainful leiomyomas in pregnancy. METHODS: A 2D section of the area of interest in the uterine wall was first obtained in 29 patients to determine whether the pain originated from a myoma or a uterine contraction. Then, volume acquisition was activated and Doppler indices (vascularization index, flow index, and vascularization-flow index) were calculated for thickened and normal uterine wall. RESULTS: Of 15 patients found to have uterine myomas, 11 had multiple tumors and 4 had single tumors. In the remaining 14 patients the painful uterine thickening proved to be a focal contraction. Painful segments of uterine thickening were associated with lower Doppler indices. Painful myomas were found to have significantly lower indices than normal uterine wall (P=0.008, 0.03, and 0.01 for VI, FI, and VFI, respectively, vs. 0.001, 0.003, and 0.01). However, the differences in indices between nonpainful myomas and uterine wall on the one hand, and nonpainful myomas and focal uterine contractions on the other, were not statistically significant. CONCLUSION: Three-dimensional power Doppler ultrasound may be a sensitive and reliable tool for distinguishing painful uterine myomas from focal myometrial contractions and nonpainful myomas.

The use of pulsed-wave Doppler in prenatal diagnosis. An update.

Pulsed wave Doppler ultrasound of fetal vessels confirms the similarity of human fetal circulation to the experimental animal physiology, The result of a multitude of research articles in this field is the clinical use of various components of fetal circulation in perinatal medicine. Umbilical, uterine and fetal cerebral arteries as well as the fetal venous circulation show the potential of Doppler ultrasonography.

Second trimester abortion by laminaria followed by vaginal misoprostol or intrauterine prostaglandin F2alpha: a randomized trial.

Intra-amniotic injection, as well as intravaginal application of prostaglandins, have been used to terminate second trimester pregnancies. There is as yet no consensus as to the most efficient protocol of such late abortions. Our goal was to compare the efficacy of intra-amniotic injection of prostaglandin F2 alpha (PGF2alpha) and intravaginal application of misoprostol in terminating second trimester pregnancies after pretreatment with intracervical laminaria. Women with live fetuses and requesting second trimester abortions were randomized into two groups. Eighteen hours following the insertion of intracervical laminaria, women were treated with either intra-amniotic injection of 40 mg PGF2alpha, or 12 hourly doses (to a maximum of 4 doses) of 200 mcg misoprostol. Fifty women were randomly assigned to each group. Failure to abort within 24 h of initiation of treatment occurred in 6 patients (12%) in the misoprostol group and 14 (28%) of the PGF2alpha group (p = 0.04). Mean time of induction of pharmacologic treatment to abortion was 13.6 h in the misoprostol group and 10.7 h in the PGF2alpha group (p = 0.03). The mean number of analgesic injections given were 0.8 in the misoprostol group and 1.6 in the PGF2alpha group (p = 0.0001). Only the method of abortion was predictive of abortion success and not other variables such as patient age, gestational age, gravidity, or parity. Following intracervical laminaria, vaginal misoprostol has been found to be more effective and less painful, compared with intra-amniotic PGF2alpha, for the termination of second trimester pregnancies with live fetuses.

Obstetricians' opinions regarding patient choice in cesarean delivery.

OBJECTIVE: To survey the opinions of Israeli obstetricians regarding their position on patient choice cesarean delivery. METHODS: Short anonymous questionnaires were sent by mail. The questionnaire included basic demographic data followed by three short case presentations of patients requesting cesarean delivery without a medical indication; the respondents were asked if they would consent to the patients' request. Respondents were then asked about their personal preferences on the mode of delivery, their attitude towards women's right to choose cesarean delivery, and whether obstetricians should inform their patients of this right. RESULTS: Of the 650 questionnaires sent, 257 were returned. Most of the respondents were specialists, aged 35 years or older, and worked in hospitals. Seventy-five percent were male, and 27% had a teaching academic degree. The consent rate for patient choice cesarean delivery in the three case presentations ranged from 40% to 79%. Only 9% of the respondents said they would prefer cesarean delivery for themselves (if female) or for their partners. Forty-five percent supported women's right to choose cesarean delivery, and half of them stated that obstetricians should inform their patients of this right. CONCLUSION: Although the vast majority (91%) of the Israeli respondents personally prefer vaginal delivery, almost half of them support women's autonomy to choose cesarean delivery. Consequently, approximately 50% of the respondents were willing to perform cesarean delivery on request because of their support of women's autonomy, despite the fact that they believe that vaginal delivery is a better option.

Ultrasound evaluation of the fetal skull base throughout pregnancy.

OBJECTIVE: To construct nomograms for cranial base parameters of normal fetuses. STUDY DESIGN: A cross-sectional study of 386 normal singleton fetuses at 14-40 weeks' gestation. Measurements of the length and width of the sphenoid bone anteriorly and the otic cartilage posteriorly and of the angles between the ridges were obtained. RESULTS: Nomograms of the length and width of sphenoid ridge and otic cartilage, and of the angles in the cranial fossae are presented. A linear growth function was observed between cranial base measurements (sphenoid ridge length, otic cartilage length, cranial base angles) and gestational age, femur length and biparietal diameter. CONCLUSION: Measurements of the length of cranial base ridges and the angles between them can be obtained easily in the second and third trimesters and might prove useful in the evaluation of pregnancies at high risk for associated fetal abnormalities.

A new guidance system for freehand, obstetric ultrasound-guided procedures.

OBJECTIVE: To assess the performance of the UltraGuide 1000 system, and to compare ultrasound-guided freehand mid-trimester amniocentesis with and without the new guidance system. METHODS: One hundred and sixty-nine women referred for mid-trimester genetic amniocentesis were divided into two groups: a control group of 99 women who underwent the procedure by the freehand technique with scored needles and 70 patients who had the procedure carried out with the aid of a guidance system (UltraGuide 1000) with non-scored needles. The procedures were compared for duration, number of punctures and repositionings of the needle, the visibility of the needle during the puncture and the number of bloody taps. RESULTS: The study group had significantly lower rates of reinsertion (none vs. 7.1%), repositioning (7.1% vs. 17.7%), bloody taps (none vs. 6.1%), touching the fetus (5.7% vs. 22.2%) and prolonged duration of the procedure (4.3% vs. 14.4%) compared with the control group. There was one fetal loss in the control group. Non-visibility of the needle before reaching the amniotic sac occurred in 18.6% of cases in the study group and in 38.4% of cases in the control group. CONCLUSIONS: The new guidance system combines the benefits of an attached guide with the flexibility of the 'freehand' technique. Use of the new guidance system for mid-trimester genetic amniocentesis increases needle visibility and lowers the incidence of common complications.

Sonographic appearance of appendiceal mucocele.

We present a case of the diagnosis of an appendiceal mucocele in a 23-year-old woman. The unusual preoperative sonographic appearance of the lesion is described and its clinical significance and differential diagnosis are discussed.

Cross talk between beta(1) and alpha(V) integrins: beta(1) affects beta(3) mRNA stability.

There is increasing evidence that a fine-tuned integrin cross talk can generate a high degree of specificity in cell adhesion, suggesting that spatially and temporally coordinated expression and activation of integrins are more important for regulated cell adhesive functions than the intrinsic specificity of individual receptors. However, little is known concerning the molecular mechanisms of integrin cross talk. With the use of beta(1)-null GD25 cells ectopically expressing the beta(1)A integrin subunit, we provide evidence for the existence of a cross talk between beta(1) and alpha(V) integrins that affects the ratio of alpha(V)beta(3) and alpha(V)beta(5) integrin cell surface levels. In particular, we demonstrate that a down-regulation of alpha(V)beta(3) and an up-regulation of alpha(V)beta(5) occur as a consequence of beta(1)A expression. Moreover, with the use of GD25 cells expressing the integrin isoforms beta(1)B and beta(1)D, as well as two beta(1) cytoplasmic domain deletion mutants lacking either the entire cytoplasmic domain (beta(1)TR) or only its "variable" region (beta(1)COM), we show that the effects of beta(1) over alpha(V) integrins take place irrespective of the type of beta(1) isoform, but require the presence of the "common" region of the beta(1) cytoplasmic domain. In an attempt to establish the regulatory mechanism(s) whereby beta(1) integrins exert their trans-acting functions, we have found that the down-regulation of alpha(V)beta(3) is due to a decreased beta(3) subunit mRNA stability, whereas the up-regulation of alpha(V)beta(5) is mainly due to translational or posttranslational events. These findings provide the first evidence for an integrin cross talk based on the regulation of mRNA stability.

Cardiac function in fetuses with intracardiac echogenic foci.

OBJECTIVE: To evaluate cardiac dimensions and function in euploid fetuses with intracardiac echogenic foci. STUDY DESIGN: Forty-eight fetuses with a single cardiac echogenic focus situated in the left ventricle had echocardiography performed at 22-24 weeks of gestation. Fifty normal fetuses at 22-24 weeks' gestation served as controls. Two-dimensional and M-mode directed fetal echocardiography were used to exclude cardiac anomalies and measure right and left ventricular free walls and interventricular septal thickness and ventricular systolic and diastolic dimensions. Cardiac size was expressed as a ratio of ventricular wall thickness/biparietal diameter, and cardiac function was expressed as ventricular shortening fraction. Doppler fetal echocardiography measurements included pulmonary and aortic maximum systolic velocities and time to peak velocities as indices of ventricular systolic function, and the ratio between early ventricular filling (E-wave) and active atrial filling (A-wave) peak velocities at the level of the atrioventricular valves as an index of ventricular diastolic function. RESULTS: Early ventricular filling/active atrial filling peak velocity ratios were significantly lower in fetuses with intracardiac echogenic foci than in control fetuses. In the mitral valve the ratio was 0.37 +/- 0.14 (0.039) (mean +/- SD (95% confidence interval for difference between the means)) vs. 0.59 +/- 0.19 (0.052) and in the tricuspid valve it was 0.42 +/- 0.16 (0.045) vs. 0.62 +/- 0.21 (0.058). No significant differences were found in cardiac dimensions, ventricular shortening fraction and Doppler systolic indices. CONCLUSION: Euploid fetuses with intracardiac echogenic foci show low E/A ratio values in midtrimester echocardiography. This finding might indicate cardiac diastolic dysfunction.

Fetal biometry: clinical, pathological, and technical considerations.

Sonographic measurements of fetal ultrasound parameters are the basis for accurate determination of gestational age and detection of fetal growth abnormalities. Selection of the most useful single biometric parameter depends on the timing and purpose of measurement and is influenced by specific limitations. CRL (crown-rump length) is the best parameter for early dating of pregnancy. Biparietal diameter (BPD) maintains the closest correlation with gestational age in the second trimester. In cases of variation in the shape of the skull, head circumference is an effective alternative. Abdominal circumference is the most useful dimension to evaluate fetal growth, and femur length is the best parameter in the evaluation of skeletal dysplasia. Use of multiple predictors improves the accuracy of estimates. An individual approach to each pregnancy is recommended for fetal growth assessment. The various epidemiological factors involved in fetal growth should be considered and specific charts for different communities should be used when possible. The methods of fetal weight estimation with their limitations and potential errors are presented. Clinical application of fetal biometry in abnormal growth is discussed in cases of small- and large-for-gestational-age fetuses, chromosomal aberrations, and skeletal dysplasias.

Early second-trimester low umbilical coiling index predicts small-for-gestational-age fetuses.

OBJECTIVE: To evaluate the role of the early second-trimester Doppler velocimetric studies of the umbilical coiling index and umbilical cord cross-sectional area as tests for the prediction of small-for-gestational age infants. METHODS: Doppler blood flow studies in 147 singleton pregnancies at risk for delivery of a small-for-gestational-age neonate were performed at 15 +/- 1 (SD) weeks' gestation from the uterine artery, umbilical artery, middle cerebral artery, inferior vena cava, and ductus venosus. Pulsatility index values were calculated for the arteries, and preload index values and systolic-atrial contraction ratios were calculated for the veins. The sonographic cross-sectional area of the umbilical cord was measured in a plane adjacent to the insertion into the fetal abdomen. The umbilical coiling index was calculated by using sonographic longitudinal views of cord vessels from several segments antenatally and by dividing the total number of helices by cord length (centimeters) postnatally. Small-for-gestational-age neonates were identified when the birth weight was below the 10th percentile for gestational age. RESULTS: Among 147 pregnancies studied, 124 fulfilled the study criteria. Thirty-nine of the neonates were small for gestational age at birth (31.5%). The mean +/- SD gestational age at delivery of the appropriate-for-gestational-age neonates was 39.7 +/- 1.28 weeks, and that of the small-for-gestational-age neonates was 36.4 +/- 2.9 weeks (range, 28-40 weeks). The best single predictor of a small-for-gestational-age infant was the coiling index, with sensitivity of 79%, specificity of 86%, a positive predictive value of 72%, and a negative predictive value of 90%. CONCLUSIONS: The umbilical coiling index measured in the second trimester is useful in predicting the birth of a small-for-gestational-age infant and may serve as a marker for subsequent growth restriction.

The influence of maternal exercise on placental blood flow measured by Simultaneous Multigate Spectral Doppler Imaging (SM-SDI)

OBJECTIVE: To evaluate the effect of maternal isometric exercise on the placental blood flow as reflected by the velocimetric indices PI and RI derived from placental arteries. SUBJECTS: Thirty-four healthy women with normal singleton pregnancies between 22 and 35 weeks of gestation. METHODS: All subjects underwent an isometric handgrip exercise test. Maternal blood pressure and heart rate together with placental PI and RI were measured at rest, during the exercise and in the post-exercise recovery phase. All Doppler measurements were obtained using the Simultaneous Multigate Spectral Doppler Imaging (SM-SDI) technique, a new ultrasound modality that enables a Doppler study of multiple locations to take place within a very short time. RESULTS: There was a significant increase in the mean values of the maternal blood pressure and heart rate during the exercise and a significant decline in the recovery phase. There was no significant change in the mean values of the Doppler indices throughout the examination. CONCLUSION: Isometric handgrip exercise test during pregnancy does not affect the impedance of the placental circulation.

Association between epidural analgesia and intrapartum fever.

The objective of this paper is to determine whether or not epidural analgesia is an independent risk factor for intrapartum fever. Maternal temperature was measured every 4 h during labor to 1004 consecutive women in term labor. Women with fever or on antibiotics were excluded. Epidural analgesia was administered upon patients' request. Of the 406 (40%) women who received epidural analgesia, 11.8% (n = 48) developed a fever > or = 37.8 degrees C during labor compared with only 0.2% (n = 1) of women not receiving epidural analgesia. Women who received epidural analgesia were more likely to have one or more risk factors for intrapartum infection. Their labor and ruptured membranes were longer, they were more likely to have internal monitoring and have more vaginal examinations. Compared with women who received epidural analgesia and did not develop intrapartum fever, women that did develop fever had longer epidurals and more risk factors for infection. However, in a logistic regression analysis with fever as dependent variable, only the duration of epidural was significantly associated with the occurrence of fever. The rate of fever increased with longer labors, from 5% with labor < 3 h to 28% with labor > 6 h. In 90% of women the fever resolved within a few hours after delivery. Sepsis evaluation was negative in all of the newborns to mother who had intrapartum fever. Our data support a noninfectious etiology for intrapartum fever in the vast majority of our patients. However, infection must be ruled out before a decision is made to withhold antibiotic therapy.

Intrapartum drainage of fetal pleural effusion.

Our objective was to describe our experience with intrapartum thoracocentesis in fetuses with severe bilateral pleural effusion. We describe the outcome of four consecutive cases of fetal pleural effusion due to chylothorax that were managed by intrapartum thoracocentesis. These fetuses were not candidates for pleuro-amniotic shunting either because of the need for prompt delivery (three fetuses) or because of advanced gestational age (one fetus). Thoracocentesis was performed in the operating theatre under ultrasound guidance prior to Caesarean delivery. Gestational age at the time of diagnosis and thoracocentesis ranged between 26-34 weeks and 31-34 weeks respectively. Bilateral thoracocentesis was performed in two fetuses and unilateral in the remaining two fetuses. All four infants were born in a relatively good condition; however, all eventually required intubation, ventilation and chest tubes. Chest tubes were introduced between 2 h and 5 days after delivery in three infants, and immediately after birth in one infant who was hydropic. Two infants survived and are developing normally. One infant died from sepsis following successful pleurodesis and one from aspiration on day 51. Our conclusions are that intrapartum thoracocentesis seems to be a relatively simple procedure, that allows newborns with pleural effusion, to breathe spontaneously or be more easily ventilated. This in turn, reduces the need to introduce chest tubes in an emergency situation.