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Biomedical subjects

I Gull

Publications and source records attributed to I Gull.

At least 19 recordsLinked to original sources
PubMed2005

Feto-feto-fetal transfusion syndrome in monozygotic monochorionic triamniotic triplets: vascular evaluation by a cast model.

A unique cast model of the placenta in a rare case of feto-feto-fetal triplet transfusion syndrome (FFFTTS) allowed the demonstration of why the transfusion syndrome developed in one fetus and not in the other two in that single placenta. The vasculature anatomy of a monochorionic triamniotic triplet placenta with FFFTTS of three healthy infants (one donor, two recipients) born in the 35th week of gestation was cast by means of dental casting materials. After the cast hardened, the tissue was corroded, revealing the cast blood vessels. The diameters and lengths of the chorionic blood and intraplacental vessels of the cast placenta were measured with a digital caliper. The cast revealed two artery-artery (A-A) anastomoses on the chorionic plate between the two recipients and the donor. Seven artery-vein (A-V) deep anastomoses connected only the arteries of the donor and the veins of the two recipients. The blood vessel connections among the fetuses allowed the evaluation of a pathologic case with its own control in a single placenta. From the vascular appearance, we speculate that the A-A anastomoses between the two fetuses protected them from developing blood transfusions, but that the A-V anastomoses contributed to their development.

Adult↗
PubMed2002

Persistent right umbilical vein: incidence and significance.

OBJECTIVES: To conduct a prospective evaluation of the incidence and neonatal outcome of fetuses with persistent right umbilical vein. This condition had traditionally been considered to be extremely rare and to be associated with a very poor neonatal prognosis, but later evidence has raised some doubts about the veracity of these contentions. METHODS: Between August 1995 and November 1998, 8950 low-risk patients were prospectively evaluated at two medical centers. The sonographic diagnosis of a persistent right umbilical vein was made in a transverse section of the fetal abdomen when the portal vein was curved toward the stomach, and the fetal gall bladder was located medially to the umbilical vein. RESULTS: Persistent right umbilical vein was detected in 17 fetuses during the study. Four of them had additional malformations, of which three had been detected antenatally. CONCLUSIONS: We established that the incidence of persistent right umbilical vein in a low-risk population is 1 : 526. We believe that the sonographic finding of this anomaly is an indication for conducting targeted fetal sonography and echocardiography. When the persistent right umbilical vein is connected to the portal system and other anomalies are ruled out, the prognosis can generally be expected to be favorable.

Congenital Abnormalities↗
PubMed2002

Prediction of fetal weight by ultrasound: the contribution of additional examiners.

OBJECTIVES: To assess the contribution of additional examiners to: the average discrepancy between estimated and actual fetal weights; the correlation between estimated and actual fetal weights; the reduction in major (> 10%) discrepancies between estimated and actual fetal weights. DESIGN: Three experienced sonographers independently measured fetal biparietal diameter, head circumference, abdominal circumference and femur length in 39 fetuses at term. The estimated fetal weights were calculated for each examiner. Fetal biometric measurements were analyzed to obtain the source of differences in estimations among the examiners. Discrepancy, correlation and number of major (> 10%) discrepancies between the estimated and actual fetal weights were calculated for each examiner, and the contribution of additional examiners was analyzed. RESULTS: The differences in measurements of the biparietal diameter and femur length were lower than those of the head and abdominal circumferences. For each of the three examiners, the average discrepancy between the estimated and actual fetal weights was 6.1%, 5.9% and 6.3%. When the estimation was based on two examiners, the discrepancy decreased to 4.8-5.6%. The contribution of a third examiner was nil. Major (> 10%) discrepancies between estimated fetal weight and actual birth weight were found in seven, eight and nine estimations of the examiners. Estimation by two examiners decreased the number of major discrepancies, and estimation by all three examiners further decreased by approximately 50% the number of major discrepancies between the estimated and actual fetal weights. CONCLUSION: Measurements by multiple examiners changes only slightly the average number of discrepancies between estimated and actual fetal weights. However, the reduction in major (> 10%) discrepancies is statistically and clinically significant.

Anthropometry↗
PubMed2001

The mechanism of hydrosalpinx in embryo implantation.

BACKGROUND: Hydrosalpinx adversely affects embryo implantation and contributes to poor implantation rates post embryo transfer. Embryo transport depends on concomitant intrauterine fluid motion induced by uterine wall motility, the result of spontaneous myometrial contractions towards the fundus. METHODS AND RESULTS: The uterine dynamics of five patients with hydrosalpinx were recorded and analysed by image-processing techniques: the frequency was higher while the amplitudes and passive widths were lower compared with healthy volunteers. The existing peristaltic activity should have induced intrauterine fluid flow; however, the recordings failed to show the expected transport of fluid bolus. This observation was supported by mathematical simulations based on the hypothesis that fluid accumulation in the Fallopian tube of a patient with hydrosalpinx increases tubal pressure and thereby induces a pressure gradient between the fundus and the cervix. This pressure gradient acts adversely to the cervix-to-fundus intrauterine peristalsis and generates reflux currents that may thrust embryos away from the implantation site. CONCLUSIONS: The reflux phenomenon could explain the reduced implantation rate associated with hydrosalpinx. Resolution of the issue of whether the removal of a Fallopian tube with hydrosalpinx should be undertaken for improving IVF pregnancy rates should be accompanied by prospective randomized clinical trials.

Adult↗
PubMed2001

Effect of the supine position on uterine and umbilical blood flow during the third trimester of uncomplicated pregnancies in multiparous patients.

We established the effects of the supine position on umbilical blood flow when measured during the third trimester in 30 multiparous, normotensive patients. Blood flow in the umbilical and uterine arteries and blood pressure in the brachial and popliteal arteries were blindly taken by two different observers: first in the lateral and 5 min later in the supine position. There was a significant difference in mean blood pressure between the two postures. However, there was no statistical difference in the pulse pressure or in systolic/diastolic ratio in the umbilical and uterine arteries between the two positions. Postural changes in normotensive multiparous patients do not affect uterine and umbilical blood flow during the third trimester of uncomplicated pregnancies.

Adult↗
PubMed2000

Is amniotic fluid volume influenced by a 24-hour fast?

OBJECTIVE: To assess the influence of fasting for 24 hours on the amniotic fluid index (AFI). STUDY DESIGN: The AFI of 22 parturients in the second trimester of uncomplicated pregnancy was evaluated on the morning after a 24-hour fast. Patients were prospectively matched to another group of 25 patients who did not fast. Both groups were reevaluated after one week. Two different observers, blind to each other's results, performed the examinations. RESULTS: A statistically significant difference was found in the AFI between the two groups on the day after fasting (11.73 +/- 2.12 versus 15.4 +/- 1.2, respectively; P < .01). After one week there was no difference in AFI between the two groups (15.35 +/- 1.2 and 15.42 +/- 1.2, respectively; P > .01). CONCLUSION: Fasting may reduce the amniotic fluid volume as shown by the AFI, and fluid intake may restore the normal amount of amniotic fluid volume.

Amniotic Fluid↗
PubMed1999

Anaerobic glycolysis. The metabolism of the preovulatory human oocyte.

OBJECTIVES: The aim of the study was to investigate the process of glycolysis in gonadotropic, hyperstimulated, human ovarian follicles. STUDY DESIGN: Follicular fluid (FF) lactate and glucose concentrations were measured in 26 patients with tubal factor infertility undergoing in vitro fertilization treatment. RESULTS: The mean FF lactate and glucose concentrations were 3.17+/-0.90 mM with positive, and 3.39+/-0.91 mM with negative correlations to follicular size. FF lactate concentration correlated negatively to glucose levels. CONCLUSIONS: Our study confirms in vivo the anaerobic glycolysis in gonadotropic, hyperstimulated human ovarian follicles.

Anaerobiosis↗
PubMed1999

Antenatal sonographic diagnosis of epignathus at 15 weeks of pregnancy.

Epignathus is a rare, benign, congenital teratoma of the hard palate. Most of these teratomas are unidirectional and protrude through the mouth. Hence, the prognosis depends on the size of the tumor and the degree of face distortion and airway obstruction that it causes. However, some epignathi protrude bidirectionally, involving and destroying the brain tissue, resulting in a poor prognosis. This report presents a case of ultrasonographic detection of a bidirectional epignathus at 15 weeks of pregnancy.

Abortion, Induced↗
PubMed1998

Breech delivery: the value of X-ray pelvimetry.

OBJECTIVE: The study was conducted to compare maternal and neonatal outcome of two groups of nulliparae with breech presentations, who were selected for vaginal delivery by protocols differing only in their use of X-ray pelvimetry. STUDY DESIGN: We reviewed all term singleton breech deliveries of nulliparous patients who were eligible for vaginal trial of labour in our Centre between 1992 and 1994. In Group A (n=85) X-ray pelvimetry was performed, and in Group B (n=70) it was not. Obstetric management was otherwise similar. Admission to the two departments was on alternate days. RESULTS: The rate of caesarean section was similar in both groups (Group A, 36.4% vs. Group B, 42.8%; P>0.05), however, the indications for caesarean section differed. Neonatal outcome was similar in both groups. Maternal febrile morbidity was higher in Group B patients, especially those who underwent caesarean section after a trial of labour. CONCLUSION: X-ray pelvimetry in nulliparae with breech presentation is associated with reduced maternal febrile morbidity, but does not improve neonatal outcome.

Birth Injuries↗
PubMed1998

Can labor with breech presentation be induced?

Our objective was to evaluate the efficacy and safety of labor induction in women with a breech presentation, and an unripe cervix. We conducted a retrospective, matched-paired study on patients with breech presentation and an unripe cervix (n = 23), who underwent induction of labor using extra-amniotic saline instillation. The women were compared to three matched control groups: 46 women with vertex presentation and an unripe cervix, whose labor was induced by the same method, 23 with breech presentation who underwent a vaginal trial of labor, and 23 women with breech presentation who underwent a cesarean section without a trial of labor. In the study group, 12 women (52.2%) delivered vaginally. Rates of Apgar score, birth trauma, and maternal morbidity were similar in all groups. Induction of labor in patients with a breech presentation and an unripe cervix may be attempted in selected cases as it seems to be efficacious (vaginal delivery rate of 52.2%) and safe for both fetus and mother.

Adult↗
PubMed1998

Reproducibility of transvaginal ultrasonographic measurements of endometrial thickness in patients with postmenopausal bleeding.

The aim of the study was to establish the reproducibility of transvaginal sonographic measurements of endometrial thickness in patients with postmenopausal bleeding (PMB). In a prospective blind study, two examiners measured the endometrial thickness in 48 patients presenting with PMB by transvaginal sonography on two separate occasions, 30 min apart. The analysis of variance performed at each endometrial thickness measured by the two examiners revealed no statistical difference. However, it was shown that the most accurate measurements are up to the level of 4 mm (mean deviation of 0.1 +/- 0.2 mm, range 0.7). Once the endometrial thickness reaches 5-6 mm the mean deviation becomes 0.3 +/- 1.2 mm with a range of variation of 4 mm. In conclusion, measurements of endometrial thickness in patients presenting with PMB can be repeated quite accurately up to a level of 4 mm thickness.

Endometrium↗
PubMed1998

Umbilical cord blood acid-base values in uncomplicated term vaginal breech deliveries.

BACKGROUND: This prospective study was conducted to compare the umbilical cord blood acid-base values of uncomplicated, assisted, vaginal-breech-delivery term neonates with those of uncomplicated, cephalic-vaginal delivery term neonates and to determine whether a different metabolic status should be expected in neonates born by way of uncomplicated vaginal breech delivery. METHODS: Umbilical cord artery and vein blood samples were obtained from 30 term neonates with frank or complete breech presentations who were born by uncomplicated assisted vaginal breech delivery. All these neonates had an Apgar score of >7 at 5 min and an uneventful neonatal course (study group). For each neonate in the study group the two consecutive term neonates who were delivered by uncomplicated cephalic spontaneous vaginal delivery, and had uneventful neonatal courses, served as controls (control group). RESULTS: The umbilical cord artery blood pH and pO2 were significantly lower (p<0.001 and <0.01, respectively) and the pCO2 was significantly higher (p<0.001) in newborns of the study group, compared to the controls. The umbilical cord vein blood pH was significantly lower (p<0.01), and the pCO2 significantly higher (p<0.01) in the study group. CONCLUSIONS: The umbilical cord blood acid-base values of uncomplicated, vaginal-breech-delivery term neonates differ significantly from those of uncomplicated, cephalic-vaginal delivery neonates. These differences may represent a greater degree of acute cord compression that reflects the different mechanisms of labor in vaginal breech delivery.

Adult↗
PubMed1998

Intrauterine irrigation with prostaglandin F2-alpha for management of severe postpartum hemorrhage.

BACKGROUND: Severe postpartum hemorrhage is a significant contributor to maternal morbidity and mortality. The use of prostaglandin F2-alpha to control severe postpartum hemorrhage may avert surgery for the control of bleeding. METHODS: After ruling out the possibility of genital tract injuries, 18 patients with severe postpartum hemorrhage caused by uterine atony were enrolled in the study. None of the patients responded to treatment with oxytocin, methylergonovine, or uterine massage. A Foley catheter was introduced into the uterine cavity and the balloon was inflated with 5 ml sterile saline solution. The catheter was connected to an infusion line of 500 ml saline solution containing 20 mg prostaglandin F2-alpha. The solution was infused at a rate of 3-4 ml/minute for the first 10 min, and then reduced to 1 ml/minute for a period of 12 24 hours. RESULTS: In 17 patients (94.4%) bleeding ceased within several minutes of initiation of intrauterine prostaglandin F2-alpha infusion, the uterus was firmly contracted and uterine bleeding did not recur. In one patient with placenta increta bleeding continued and hysterectomy was performed. None of the patients had any side effects. CONCLUSIONS: Intrauterine irrigation with low concentrations of prostaglandin F2-alpha is a simple, rapid and effective treatment for severe postpartum hemorrhage and facilitates constant and continuous hemostasis. Moreover, the minute dosage used eludes potentially complicating side effects.

Dinoprost↗