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Biomedical subjects

T Mantzavinos

Publications and source records attributed to T Mantzavinos.

At least 37 records · Page 2Linked to original sources
PubMed1994

Five years' follow-up in two patients with borderline tumours of the ovary hyperstimulated by gonadotrophin therapy for in-vitro fertilization.

In two women (36 and 30 years old) during infertility evaluation by ultrasound, an ovarian cyst was found on the left side (5 x 7 and 6 x 9 cm respectively). In both cases, it was decided to perform a unilateral salpingo-oophorectomy, keeping the other ovary (after a negative biopsy) for a future in-vitro fertilization (IVF) procedure with their own oocytes. The histology report for each patient showed the cyst was an epithelial borderline tumour. The first woman achieved a pregnancy and delivered a healthy baby after the first IVF attempt, while the second is currently undergoing her third attempt. This paper reports on a follow-up 5 years after the first IVF attempt.

Adult↗
PubMed1993

Assessment of autoantibodies to the zona pellucida in serum and follicular fluid in in-vitro fertilization patients.

Eighty two consecutive IVF patients enrolled in our In-Vitro Fertilization program were investigated on the presence of anti-zona pellucida antibodies in the peripheral blood and follicular fluid, using a haemaglutination test (ovarian zona pellucida HAT) and a zona pellucida slide test, respectively. Overall higher proportion of antibody activity was observed in pregnant patients in both compartments (60% and 53%) in serum and follicular fluid, respectively) than the activity observed in non-pregnant (25% and 48%, respectively). There were no statistically significant differences found for the mean number of oocytes retrieved and fertilized irrespective of the presence of antibodies in serum or in follicular fluid, each one being taken into account separately. However, higher fertilization rates were observed in serum or follicular fluid antibody negative patients (68.2% and 71.2%, respectively) than those who were tested positive (36.6% and 65.4%, respectively). The same was true for the presence of anti-zona pellucida antibodies in serum and in follicular fluid, taking into consideration their presence or absence in both compartments simultaneously.

Adult↗
PubMed1993

Immunoglobulins IgG, IgA, IgM, complement C3, C4 and ferritin and transferrin levels in serum and follicular fluid in IVF patients.

Serum and follicular fluid immunoglobulin (IgG, IgA, IgM) and complement (C3, C4), as well as transferrin and ferritin concentrations were measured in 82 consecutive IVF patients (Pregnant: Group A, and non pregnant: Group B). Higher serum concentrations were observed in complement in all Immunoglobulins but IgM which was found to be significantly lower in follicular fluid in both groups. Also there were no statistically significant differences observed for transferrin and ferritin levels in either compartment or among the groups. No correlation was found for the above parameters and the in vitro fertilization outcome in terms of oocytes retrieved, fertilized and embryos implanted.

Adult↗
PubMed1992

Hormone levels of follicular fluids with and without oocytes in patients who received gonadotropin-releasing hormone analogues and gonadotropins in an in vitro fertilization program.

BACKGROUND: Are follicles where no oocytes are retrieved "empty follicles"? METHODS: The levels of estradiol (E2), progesterone (P), testosterone (T), cortisol (F), and prolactin (PRL) of follicular fluids (FF) aspirated individually from 34 randomly selected IVF patients in whom no oocytes were recovered were compared with the respective hormone levels of FF obtained from the same patients when oocytes were retrieved. Two FF without oocytes of a 35th patient in whom no oocytes were retrieved were analyzed. RESULTS: Hormones did not differ significantly in the paired samples, while in the two FF of the 35th woman they were in agreement with cystic follicles. CONCLUSIONS: It is necessary to differentiate aspirated follicles where no oocytes are retrieved from the "empty follicle syndrome," which was not observed in the IVF series studied and should be rare in IVF patients.

Female↗
PubMed1992

Discordant secretion of pregnancy specific beta 1-glycoprotein and human chorionic gonadotropin by human pre-embryos cultured in vitro.

OBJECTIVE: To study and compare the secretion of pregnancy specific beta 1-glycoprotein (SP1) and human chorionic gonadotropin (hCG) by human pre-embryos, cultured in vitro, with their respective morphological development. DESIGN: Spare human pre-embryos from randomly selected women participating in a program of in vitro fertilization (IVF) were studied prospectively. SETTING: Pre-embryos were cultured, and hormone release was determined in academic research laboratories. PATIENTS, PARTICIPANTS: Pre-embryos (n = 108) cultured for 14 days after fertilization in Ham's F-10 medium (GIBCO Ltd., Paisley, Scotland) were observed, and hCG and SP1 were measured in the culture media at regular intervals. MAIN OUTCOME MEASURES: Discordant secretion of SP1 and hCG. RESULTS: Of the 98 bipronucleate pre-embryos, 53.6% formed blastocysts, 17.3% of which hatched. Human chorionic gonadotropin was detected from day 7 after fertilization concomitantly with blastocyst formation, thereafter showing a logarithmic increase (maximum 10,650 mIU) until the first signs of embryonic disintegration. Pregnancy-specific beta 1-glycoprotein release started 3 to 4 days after fertilization independently of the morphological development and the future production of hCG, thereafter displaying a nonlogarithmic increase (maximum 41 ng). CONCLUSIONS: Hormone secretion and morphological development are unique for each pre-embryo. Human chorionic gonadotropin and SP1 seem to have different biochemical and physiological regulation.

Blastocyst↗
PubMed1992

Secretion of alpha-immunoreactive inhibin by human pre-embryos cultured in vitro.

alpha-Immunoreactive inhibin was measured using an enzyme immunoassay kit in the culture medium (Ham's F-10 medium supplemented with 14% heat-inactivated human serum) from day 3 or 4 to day 14 post-fertilization of 31 surplus pre-embryos from eight women participating in an in-vitro fertilization programme. Inhibition secretion was demonstrated in all of them from the fourth day after fertilization (mean +/- SEM: 3.0 +/- 0.7 U) and was independent of the morphological development of pre-embryos (2-4 cells, n = 4; 6-8 cells, n = 4; 8-10 cells, n = 9; 10-12 cells, n = 4; morulae, n = 5 and blastocysts, n = 4). On days 7, 10, 13 and 14 post-fertilization, mean inhibin values +/- SEM for non-disintegrated pre-embryos were respectively: 6.5 +/- 0.9 U, 12.3 +/- 2.0 U, 16.8 +/- 3.2 U and 20.2 +/- 3.7 U; however, when disintegration was noted on days 10 and 13 after fertilization, inhibin mean values were 9.0 +/- 1.4 U and 8.4 +/- 1.7 U respectively. Inhibin levels were significantly correlated with human chorionic gonadotrophin levels in the same culture media only on day 13, while correlation with pregnancy specific beta 1-glycoprotein occurred on day 7 post-fertilization. In conclusion, early human pre-embryos secrete alpha-immunoreactive inhibin before the cytotrophoblast is formed. This secretion increases significantly with time when development is continued, while disintegration is followed by a net decline in the rate of inhibin release.

Analysis of Variance↗
PubMed1992

Plasma and amniotic fluid concentration of fibronectin during normal and diabetic pregnancy.

Fibronectin is a plasma glycoprotein which is involved in coagulation, platelet function, tissue repair and the vascular endothelial basement membrane. To ascertain the influence of pregnancy on plasma concentrations of fibronectin, we qualified plasma concentrations of fibronectin in normal pregnant women during the first, second and third trimester; at the time of delivery; and on the third day post partum, using a radial immunodiffusion plate procedure. The concentrations of fibronectin found in these samples were compared with the concentration of fibronectin in 20 pregnancies complicated by diabetes. Mean plasma concentrations of fibronectin rose significantly through pregnancy and were significantly higher during delivery. A decrease in the concentrations was noticed on the third post partum day. An even more significant decrease of maternal plasma concentrations was noticed during cesarean section in normal pregnancies as compared to the concentrations found at the time of normal delivery. Of the diabetic group of women studied, higher concentrations of plasma fibronectin were found at the time of cesarean section than at the time of delivery. Maternal plasma concentrations of fibronectin were significantly greater than amniotic fluid and umbilical cord plasma concentrations.

Amniotic Fluid↗
PubMed1992

Pregnancy after in vitro fertilization in a patient with borderline tumor of the ovary.

A 36 year old woman with unilateral tubal disease was found, during infertility evaluation, to have epithelial tumor of borderline malignancy in one ovary. She was treated with salpingo-oophorectomy and three months later she asked to participate in our IVF program. High doses of gonadotropins were given for controlled hyperstimulation and a successful pregnancy and live birth was achieved.

Adult↗
PubMed1991

Serum levels of steroid and placental protein hormones in ectopic pregnancy.

UNLABELLED: The hormonal profiles of extra-uterine pregnancies (EP) were compared with the normal intra-uterine pregnancies (IUP), and threatened abortions (TA) of good outcome. In 45 cases of EP confirmed histologically, maternal serum human chorionic gonadotropin (hCG), pregnancy specific beta 1-glycoprotein (SP1), 17 beta-estradiol (E2) and progesterone (P) were measured serially before treatment by enzyme immunoassays (EIA). The same hormones were also determined in the control groups, 26 with normal IUP and 24 with TA. All four hormone levels in EP were significantly lower (P less than 0.01-P less than 0.0001) than in normal pregnancies and threatened abortions of matched gestational age except the hCG and E2 in the fifth week of pregnancy. The mean values of E2 and P were found in the normal levels of luteal phase or slightly over them (8th-9th and 9th-10th weeks, respectively). No increase in the hormonal profiles of the above two steroids was noticed between 5 and 10 weeks' gestation in EP. IN CONCLUSION: (a) The significantly lower values of hCG and SP1 in EP were confirmed; (b) the serial and concurrent hormonal measurements assure the verification of EP and the differentiation from normal IUP and TA of good outcome; (c) the ectopic implantation of trophoblast critically reduces its vitability to hCG and SP1 synthesis and it can only partially compensate for the reduction of corpus luteum function.

Abortion, Threatened↗
PubMed1991

Comparison of maternal serum estradiol and progesterone levels in pregnancies after induced and spontaneous ovulation.

Maternal serum estradiol and progesterone levels during the early 6th to 15th weeks of gestation, were measured by radioimmunoassay in 140 pregnancies following induction of ovulation with gonadotropins or clomiphene citrate. The levels were compared with those observed in 79 spontaneous pregnancies. Significantly higher levels were observed in gonadotropin and clomiphene citrate induced pregnancies (both P values less than 0.001) between the 6th to 9th week of gestation as compared to spontaneous pregnancies. Steroid levels were similar in the two groups from the 9th week onwards. No statistically significant differences in steroid hormone values were observed in aborted and successful pregnancies within each group studied. We conclude that ovulation induction is associated with higher estradiol and progesterone levels until placental steroidogenesis starts.

Adult↗
PubMed1991

Peritoneal fluid volume parameters in infertile patients.

The peritoneal fluid volume (PFV) and its cellular and acellular components have been repeatedly associated with infertility. The PFV from 88 infertile women was analyzed in relation to endometriosis, pelvic adhesions, tubal patency, luteinization, endometrial cells and macrophages. The independent existence of parameters such as the onset of luteinization, the increased population of macrophages and the presence of endometriosis increase statistically significantly the PFV. In the presence of peritoneal adhesions or/and obstructed tubes the PFV was significantly decreased.

Adult↗
PubMed1991

Plasma and amniotic fluid concentrations of fibronectin during normal and post term pregnancy.

Fibronectin is a plasma glycoprotein which is involved in coagulation, platelet function, tissue repair and the vascular endothelial basement membrane. Increase of plasma fibronectin levels in pre-eclamptic patients have been previously reported. There have been no reports however regarding plasma fibronectin levels during post term pregnancy. A significant decrease of maternal plasma concentration of fibronectin was noticed during third trimester, at the time of delivery, and the third post partum day in post term pregnancies as compared to the concentrations found in normal pregnancies.

Amniotic Fluid↗
PubMed1988

Review of ovarian cancer of the University of Athens.

One hundred and eight patients with cancer of the ovaries were studied retrospectively for a period of seventeen years. All the patients were managed in the Second Department of Obstetrics and Gynecology of the University of Athens. The symptoms of the patients were: pelvic pain in 43, ascites in 27, metrorrhagia in 23 and weight loss in 12. Fifty six per cent of the patients were between 40 to 60 years old and 63% were menopause. The PAP-smear in 40% was class I or II, in 50% was class III and in 10% was class IV-V. The stage of the disease was: 3 patients stage I, stage II 38, stage III 42 and 25 stage IV. No patient had stage 0. Laparotomy was done in all the patients. Thirty eight patients had Co-treatment and 42 patients chemotherapy. The pathology report was: serous cystadeno-Ca in 40, mucinous cystadeno-Ca in 38 of the cases, adenocarcinoma 18 and 12 other types of malignant tumors. The follow up of the patients showed a five years survival rate in 10% for stage I, 25% for stage II, 5% for stage III and none for stage IV.

Adult↗
PubMed1984

In vitro fertilization in Norfolk, Virginia, 1980-1983.

Three years of progress of the Vital Initiation of Pregnancy (VIP) Program in Norfolk is reported. No conception resulted from 41 oocyte aspirations during spontaneous menstrual cycles in 1980. An average of 3.7 oocytes per cycle, or a 73.5% recovery rate, resulted in 362 human menopausal gonadotropin/human chorionic gonadotropin-induced cycles from January 1981 to March 1983. Forty percent of the oocytes recovered from these cycles were preovulatory, 35% atretic, and 25% immature. Immature oocytes were often matured in vitro, fertilized, and found to produce pregnancies. A total of 62 pregnancies occurred, which represents a 17 or 23% pregnancy rate, based on laparoscopies or embryo transfers, respectively. There were 11 preclinical and 7 clinical miscarriages. Twenty-nine normal babies have been delivered, including a set of twins. The remainder appears to be normally progressing pregnancies. Polyspermia was observed in 8.8% of the fertilizable oocytes.

Adult↗
PubMed1984

Correlation of human menopausal gonadotropin/human chorionic gonadotropin stimulation and oocyte quality in an in vitro fertilization program.

One hundred forty-seven cycles in normal ovulatory patients are reported. All were stimulated with human menopausal/human chorionic gonadotropin. Three estrogen responses were identified: normal, high, and low. Patients who achieved pregnancy formed a fourth category, the pregnancy group. The number of preovulatory and immature oocytes, the preovulatory and immature oocytes that fertilized normally or abnormally, the ones that cleaved in culture, and the ones that were transferred were used as parameters to compare quality of the oocytes in each of the estrogen responders. No significant differences were found in any of them. Abnormal zonae pellucidae are described as possibly due to overmaturation of the follicle. No significant difference in the proportion of abnormal zonae in the different categories was found.

Adult↗
PubMed1983

The importance of the follicular phase to success and failure in in vitro fertilization.

One hundred seventy-five cycles in patients with irreparable tubal disease were stimulated by human menopausal gonadotropin/human chorionic gonadotropin for the purpose of in vitro fertilization. As judged by the height of the peripheral estradiol response, the patients were classified as high, intermediate, or low responders. In addition, the estradiol pattern of the response was found to be separable into six categories. The pregnancy rate was found to be related to the height and to the pattern of peripheral response. The overall pregnancy rate in this consecutive series was 19% but varied according to the height and pattern of response from 40% to 0%.

Estradiol↗