High rates of abnormalities in hysterosalpingography in couples with male factor infertility.

The rate of anatomical abnormalities in infertile couples with obvious male factor is unknown. For this purpose the authors retrospectively analyzed 376 hysterosalpingographies (HSG) of couples with severe male factor. Patients were subdivided into four groups according to the woman's age, and primary or secondary infertility: A--less than 35-years-old, primary infertility, B--less than 35-years-old, secondary infertility, C--35-years-old or more, primary infertility, and D--35-years-old or more, secondary infertility. Overall, abnormalities in HSG were demonstrated in 25.5% of the patients, and in 18, 21, 52, and 40 percent of patients in groups A, B, C and D, respectively. Age was found to be a significant independent risk factor (p < 0.05) while primary or secondary infertility was not. The adjusted odds ratio for woman who were 35-years-old or more to have any abnormalities in HSG were 3.7-fold greater (95% CI 2.2- 6.23), than women who were less than 35-years-old. In conclusion, relatively high rates of female mechanical abnormalities may be found even in infertile couples with obvious male factor and are significantly more prevalent in older women.

Serum retinol-binding protein-4 levels in polycystic ovary syndrome patients undergoing controlled ovarian hyperstimulation for in-vitro fertilization cycle.

AIMS: To determine serum retinol-binding rotein 4 (RBP-4) levels in polycystic ovary syndrome (PCOS) patients undergoing controlled ovarian hyperstimulation (COH) for an in vitro fertilization-embryo transfer (IVF-ET) cycle and the possible correlation to COH variables. PATIENTS AND METHODS: 11 consecutive PCOS patients undergoing our routine IVF flexible multidose gonadotropin-releasing hormone (GnRH)-antagonist protocol. Blood was drawn three times during the COH cycle: (1) day 1 or 2 of menstruation, and prior to gonadotropin administration (Day-S) (Day-S); (2) day of or prior to human chorionic gonadotropin (hCG) administration (Day-hCG); and (3) day of ovum pick-up (Day-OPU). Levels of estradiol and serum RBP-4 were compared among the three time points. Serum RBP-4 was measured with a commercial immunoassay. RESULTS: Results showed significantly lower levels of serum RBP-4 on Day-OPU and Day-hCG than on Day-S. Though significant correlations were observed between serum RBP-4 and body mass index, fasting glucose or glucose to insulin ratio, no correlations were found between serum RBP-4 and IVF treatment variables or pregnancy rate. CONCLUSION: While serum RBP-4 decreases during COH for IVF, there is apparently no correlation of serum RBP-4 levels with IVF treatment variables or outcome.

The possible influence of increased body mass index on the clinical efficacy of standard human chorionic gonadotropin dosage.

OBJECTIVES: To evaluate whether the efficacy of standard (10,000 IU) hCG dosage is BMI dependent. PATIENTS & METHODS: During the study period, body mass index (BMI) was recorded in 261 consecutive women enrolled in our ICSI program. Women in the 90th BMI percentile were compared with those in the 10th percentile. The number and percent of mature metaphase-II (M-II) oocytes were considered as the outcome measure. RESULTS: Mean BMI of the 10th and 90th percentile groups were 18.2 +/- 0.7 kg/m2 (n = 26) and 32.8 +/- 2.2 kg/m2 (n = 27), respectively. There were no differences between the groups in mean patients age, number of gonadotropin ampoules used, mean number of oocytes retrieved or the number and percentage of mature M-II oocytes. CONCLUSIONS: Standard (10,000 IU) hCG dosage is adequate to induce final oocyte maturation in IVF patients regardless of their BMI. This may imply that this hCG dosage is much higher than the dosage that is actually required.

The outcome of patients with stage I endometrial cancer involving the lower uterine segment.

The objective of this study was to evaluate whether lower uterine segment involvement (LUSI) correlates with recurrence and survival in women with stage I endometrial adenocarcinoma and whether it is associated with poor prognostic histopathologic features. Three hundred seventy-five consecutive patients with endometrial carcinoma stage I compromised the study population. The patients were divided into two groups according to the presence of LUSI with endometrial carcinoma. The two groups were compared with regard to prognostic factors and outcome measures by using the Pearson chi(2) test, log-rank test, and Cox proportional hazards model. LUSI was present in 89 (24%) patients with stage I endometrial carcinoma. LUSI was significantly associated with grade 3 tumor (P = 0.022), deep myometrial invasion (P < 0.0001), and the presence of capillary space-like involvement (CSLI) (P = 0.003). Kaplan-Meier survival curves demonstrated that patients with LUSI had a lower recurrence-free survival (log-rank test; P = 0.009) and a worse overall survival (log-rank test; P = 0.0008). In the Cox proportional hazards model, only a trend toward higher recurrence rate (HR = 2.4, 95% CI 0.7, 8.2; P = 0.16) and a trend toward poorer overall survival (HR = 1.54, 95% CI 0.82, 2.91; P = 0.18) were noted when LUSI was present. In patients with stage I endometrial cancer, the presence of LUSI is associated with grade 3 tumor, deep myometrial invasion, and the presence of CSLI. A larger group of patients is necessary to conclude whether higher recurrence rate and poorer overall survival are associated with the presence of LUSI.

Early endometrial changes following successful implantation: 2 and 3-dimensional ultrasound study.

OBJECTIVE: To study of the possible role of ultrasound (US) measurements of the endometrium in the prediction of IVF outcome. PATIENTS AND METHODS: 28 infertile women underwent US measurements of endometrial thickness and volume on day of ET and two weeks later. US measurements were compared between day of ET and two weeks later, and between those who conceived and those who did not. RESULTS: While in the group of patients who conceived (n = 7) endometrial thickness and volume rose significantly between day of hCG and two weeks later, no differences were observed in patients (n = 21) who did not. CONCLUSION: The dynamic changes in endometrial volume and thickness between day of ET and two weeks later may predict IVF treatment outcome.

Lymphvascular space involvement compromises the survival of patients with stage I endometrial cancer: results of a multicenter study.

AIMS: To quantify the relative risk associated with lymphvascular space involvement (LVSI) on outcome measures in patients with apparent stage I endometrial cancer. METHODS: Six hundred and ninety nine consecutive patients with endometrial carcinoma apparent stage I, who underwent surgery in one of four gynecological oncology centers in Israel, comprised the study population. Forty cases with and 659 without LVSI were followed for a median time of 39 months. Recurrence free, disease specific and overall survival was compared between the two groups. The effect of LVSI, adjusted for other clinical and histo-pathological prognostic factors, was assessed by multivariate analysis. RESULTS: The univariate Kaplan-Meier procedure for survival analysis showed that patients with LVSI had lower recurrence free survival (p=0.0003), worse disease specific (p=0.0007) and overall survival (p<0.0001). Cox proportional hazards model demonstrated a trend toward shorter recurrence free survival (HR=2.0, 95% CI 0.9, 4.5; p=0.08), a worse disease specific survival (HR=2.8, 95% CI 1.1, 7.4; p=0.04) and decreased overall survival (HR=2.0, 95% CI 1.1, 3.8; p=0.03) in cases with LVSI. CONCLUSIONS: In patients with apparent stage I endometrial cancer the presence of LVSI, an independent poor prognostic factor, is associated with a two fold increased risk of death. The presence of LVSI warrants consideration when deciding upon post operative management.

Luteal phase support for patients undergoing frozen-thawed embryo transfer cycles--the required progesterone dose.

OBJECTIVE: With the recent trend toward single-embryo transfer (ET), cryopreservation of extraneous embryos is becoming increasingly prevalent. Several replacement protocols for frozen-thawed ET exist, with no consensus regarding the dosage or delivery mode of progesterone. PATIENTS AND METHODS: Hormonal replacement with only estrogen and progesterone is the most frequently used protocol in women with and without functioning ovaries in our unit. Since August 2005, we have doubled the usual daily dose of progesterone for luteal support due to a high prevalence of patients experiencing withdrawal bleeding 11-13 days after ET. We compared the outcome of frozen-thawed ET cycles using different doses of progesterone for luteal support. RESULTS: While the prevalence of embryos that survived the thawing process was significantly higher in the earlier (69%) as compared to the later period (58%), positive b-hCG pregnancy rates (17.5% vs 44.8%, respectively) and clinical pregnancy rates per transfer (7.9% vs 41.4%, respectively) were significantly higher in the later period. CONCLUSION: We conclude that high-dose progesterone supplementation in the luteal phase of frozen-thawed ET cycles results in a significantly higher clinical pregnancy rate.

GnRH agonist versus GnRH antagonist in ovarian stimulation: is the emperor naked?

OBJECTIVE: The aim of the study was to evaluate the influence of type of GnRH-analog used during controlled ovarian hyperstimulation (COH) on the outcome of in vitro fertilization (IVF) cycles. PATIENTS AND METHODS: All consecutive women aged < or = 35 years admitted to our IVF unit from January 2001 to December 2004 were enrolled in the study. Only patients undergoing up to their third IVF cycle attempt were included. Ovarian stimulation characteristics, number of oocytes retrieved, number of embryos transferred, and clinical pregnancy rate were compared between women given GnRH-agonist or GnRH-antagonist during COH. RESULTS: Four hundred and eighty-seven consecutive IVF cycles were evaluated, 226 in the agonist group and 261 in the antagonist group. A clinical pregnancy was achieved in 93 patients in the agonist group (pregnancy rate 41.2% per cycle) and 66 patients in the antagonist grup (pregnancy rate 25.3%); this difference was statistically significant (p < 0.01). The agonist group also used significantly more gonadotropin ampoules, required longer stimulation, and had higher estradiol levels on the day of human chorionic gonadotropin administration. CONCLUSION: The midluteal long GhRH-agonist suppressive protocol should be the protocol of choice in young patients in their first three IVF cycle attempts.

Human placental Hofbauer cells express sprouty proteins: a possible modulating mechanism of villous branching.

The development of the chorionic villous tree into a complex and organized ramified tubular network can be termed branching morphogenesis. Studying the molecular mechanisms involved in this process may contribute to the understanding of pregnancy complications such as preeclampsia. Sprouty (Spry) proteins are important regulators of branching morphogenesis and growth factor signaling. We analyzed the expression of Spry genes in human placenta. RT-PCR and immunohistochemistry were employed to detect placental Spry expression. Quantitative RT-PCR was used to assess the effect of FGF and reduced oxygen fraction on Spry gene expression. Spry 1, 2 and 3 expression was observed in placental tissue from all three trimesters. Our results reveal for the first time that Spry proteins are localized in the stroma of the chorionic villi, adjacent to cytotrophoblasts in areas of villous sprouting. Immunofluorescent double staining with anti-Spry and anti-CD68 confirmed that placental macrophages (Hofbauer cells) express Spry. Reduced oxygen fraction, FGF-4 and FGF-10 stimulated Spry-2 expression. Hofbauer cells also expressed c-Cbl, a protein that interacts with Spry. Placental expression of Spry and c-Cbl implies an important role for Hofbauer cells in placental development, possibly through a mesenchymal-epithelial interaction with trophoblasts. Regulation of Spry-2 expression by FGF-4 and FGF-10 suggests an orchestrated regulatory system that modulates villous branching.

Transcriptional regulation of prostaglandin-H synthase-2 gene in human trophoblasts.

Abnormal PG production by placental PG-H synthase (PGHS) is associated with preeclampsia. There are two PGHS isozymes, and their regulation in trophoblasts is presently unknown. We hypothesized that the PGHS isozymes are differentially regulated in human trophoblasts. To test this hypothesis, we transfected primary trophoblasts and JEG3 cells with promoter constructs of either PGHS-1 or PGHS-2 genes. We found that in both cell systems, the basal activity of PGHS-2 promoter was 10- to 30-fold higher than the activity of PGHS-1 promoter. In response to either 12-0-tetradecanoylphorbol-13-acetate (TPA) or 8-bromo-cAMP, we observed an increase in PGHS-2 promoter activity but no change in activity of PGHS-1 promoter. Similarly, both agents enhanced PGHS-2 expression, as well as prostaglandin E2 production. The activity of PGHS-2 promoter was potentiated by coexpression of protein kinase A and inhibited by coexpression of kinase A inhibitor. Aspirin attenuated the stimulatory effect of TPA on PGHS-2 promoter. We conclude that both PGHS-1 and PGHS-2 promoters are active in trophoblasts. The activity of PGHS-2 promoter is stimulated by either TPA or cAMP, and the stimulatory effect of TPA is attenuated by aspirin. These pathways may play a role in modulation of prostanoid synthesis by trophoblasts.

Interleukin-1 stimulates prostaglandin E production by human trophoblast cells from first and third trimesters.

Prostaglandins (PGs) play a major role during implantation and labor, and their level is regulated by various cytokines. Interleukin-1 (IL-1) is a known mediator of prostaglandin E (PGE) production in various cell types, including endothelial, amniotic, and endometrial cells; however, its role in the regulation of PGE production in the trophoblast cells is yet unknown. As IL-1 and PGE are both known to be synthesized in the human trophoblast cells, we examined the possibility that IL-1 regulates PG production in human trophoblast cells. To this end, use was made of first and third trimester trophoblast cells, obtained from first trimester terminations of pregnancies and elective cesarean sections. The trophoblast cells were separated by trypsin degradation and fractionation on Percoll gradients, and cultured for 18 h under serum-free conditions in the absence or presence of IL-1 (10 ng/mL). IL-1 induced a 5-fold increase in PGE production, a response that was cell density, time, and dose dependent. IL-1-induced PGE biosynthesis was prevented in the presence of either IL-1 receptor antagonist or the soluble IL-1 receptor, suggesting a receptor-mediated response. Significantly, de novo production of PGE by trophoblast cells in the absence of IL-1 was also markedly (50%) reduced by either the IL-1 receptor antagonist or the soluble IL-1 receptor, further supporting the notion that IL-1 is involved in PGE synthesis even under basal conditions. Transforming growth factor-beta 1, a putative modulator of the effects of IL-1, significantly attenuated IL-1-stimulated PGE production, supporting the possibility that transforming growth factor-beta 1 may serve as a regulator of the effects of IL-1 in trophoblast cells. These observations suggest a pivotal role of IL-1 in the regulation of PGE economy by trophoblast cells. As trophoblast cells are in intimate contact with maternal cells, understanding the regulation of PGE levels may explain crucial processes at the feto-maternal interface, including implantation of the developing blastocyst, immunosurveilance, and the initiation of labor.

Cytokine-mediated regulation of type IV collagenase expression and production in human trophoblast cells.

The invasive property of trophoblast cells is dependent on the activity of proteolytic enzymes of the metallo- and serine proteases family. Interleukin-1 (IL-1) was found to be involved in the regulation of these proteases in various systems, serving as an important modulator in trophoblast physiology (e.g. induction of hCG beta, cytokines, and others). Therefore, consideration is given in this report to the role of IL-1 in the regulation of metalloprotease activity in human trophoblasts. Human trophoblast cells were isolated from first trimester placentas by trypsin degradation and Percoll fractionation. Primary cell cultures of first trimester trophoblasts constitutively elaborated two species of collagenase type IV (92 and 72 kDa), as assessed in gelatin matrix. Treatment with IL-1 further augmented the 92-kDa type IV collagenase secretion in a dose-dependent manner. Furthermore, IL-1 significantly (P < 0.01) increased 92-kDa collagenase gene expression by trophoblast cells, as determined by solution hybridization/ribonuclease protection assay. Both the increase in gene expression and protein biosynthesis of the 92-kDa collagenase type IV were neutralized by the soluble IL-1 receptor, indirectly suggesting a receptor-mediated response. Interestingly, transforming growth factor-beta a putative modulator of IL-1 induced effects, was shown to induce the 92-kDa collagenase type IV secretion as well. These results provide indirect evidence supporting the idea that IL-1 and transforming growth factor-beta may play an intermediary role in trophoblast invasion at the feto-maternal interface by regulating trophoblast expression of 92-kDa type IV collagenase, a protease of prime importance in trophoblast invasion.

The expression and activity of prostaglandin H synthase-2 is enhanced in trophoblast from women with preeclampsia.

Preeclampsia is associated with altered biosynthesis of vasoactive prostanoids in placental villi. The two isozymes of prostaglandin H synthase (PGHS) are essential for prostanoid synthesis. We tested the hypothesis that PGHS-2 expression is elevated in trophoblast from preeclamptic women, compared with trophoblast from healthy women. Using immunofluorescent staining, we demonstrated a higher PGHS-2 expression in villi from preeclampsia, compared with normal pregnancy. Cytotrophoblasts cultured from placentas of preeclamptic women expressed higher levels of PGHS-2 compared with cytotrophoblasts from normal placentas. This enhanced expression of PGHS-2 correlated with increased media levels of both thromboxane and prostaglandin E2, two products of PGHS activity. The increased prostanoid production by trophoblast from preeclamptic women was markedly reduced by NS-398, a specific inhibitor of PGHS-2. We conclude that both expression and activity of PGHS-2 are enhanced in trophoblasts from preeclamptic women compared with trophoblast from normal pregnancies. The increased production of prostanoids may contribute to the clinical syndrome of preeclampsia. Our data suggest that a selective inhibitor of PGHS-2 might provide a therapeutic alternative to prophylactic low-dose aspirin in modifying the prostanoid profile in preeclampsia.

Eph and ephrin expression in normal placental development and preeclampsia.

Eph receptors and their ephrin ligands play a fundamental role in embryogenesis. Their functions include cell targeting and angiogenesis. In placental development, trophoblasts migrate and invade maternal tissue and spiral arteries, where they play a role in both anchoring the placenta to the uterus and increasing blood flow to the developing fetus (interstitial and endovascular invasions). We investigated the cellular distribution and expression patterns of representative Eph and ephrin RNA and protein in an effort to identify the molecules involved in trophoblast migration during normal placental development and placental pathologies. We found ephrin-A1 expressed exclusively in the invasive extravillous trophoblast (EVT) cell lineage. We therefore proceeded to investigate ephrin-A1 in placental pathologies with defects in EVT invasion. In preeclampsia, where trophoblast invasion is shallow, we observed ephrin-A1 expression similar to normal placenta. Furthermore, in initial experiments on the deeply invading trophoblasts of placenta accreta, which lacks decidua, ephrin-A1 is found to be expressed highly in extravillous trophoblasts that have invaded the myometrium. In addition, we found the prototype ephrin-A1 receptor, EphA2, localized in several placental cell types. EphB4 and ephrin-B2 molecules, which have specific expression patterns during artery and vein development, respectively, were also expressed in the placenta. The cell specific distribution of ephrin-A1 suggests that it may play a role in targeting and migration of trophoblasts, and in the vascular remodeling induced by the invading extravillous trophoblasts. Failure of ephrin-A1 expression is unlikely to be the primary cause in defective migration of trophoblasts observed in preeclampsia. Specific roles for other Eph and ephrin proteins remain to be investigated.

Ocular manifestations in children born after in vitro fertilization.

OBJECTIVE: To report the ocular abnormalities found in children born after in vitro fertilization. METHODS: Forty-seven children (25 girls and 22 boys) born after an in vitro fertilization pregnancy (mean +/- SD birth weight, 2335 +/- 817 g; range, 924-4300 g) and referred for ophthalmic evaluation were included in the study. All underwent a thorough ocular examination. Obstetric history was gathered following a detailed questionnaire with the mothers. RESULTS: Of 70 eyes among nonverbal children, visual acuity was "normal for age" in 60 (86%), "fair" in 4 (6%), and "poor" in 6 (9%). Visual acuity in 24 eyes in verbal children ranged from 6/6 to no light perception, with 4 (17%) having poor vision. Cycloplegic refraction disclosed an emmetropia in 22 (27%), hypermetropia in 47 (57%), and myopia in 13 (16%) of the eyes. Anisometropia of more than 1.0 diopters was found in 8 children. Major ocular malformations were observed in 12 (26%) of the 47 children. These malformations included Coats disease, congenital cataract, congenital glaucoma, hypoplastic optic nerve head, idiopathic optic atrophy, coloboma with microphthalmos, and retinoblastoma. CONCLUSIONS: Ocular anomalies were frequently observed in this cohort of offspring born after in vitro fertilization. A diligent and prospective prenatal search for such malformations should unveil the real prevalence of ocular malformations in children born after in vitro fertilization.

Germ cell tumors of the ovary arising after dermoid cyst resection: a long-term follow-up study.

OBJECTIVE: To study the long-term ovarian neoplastic consequences of resection of a dermoid cyst. METHODS: The study population comprised 99 patients who were operated on for an ovarian dermoid cyst. Follow-up information was obtained for 91 women for a mean period of 5.06 +/- 2.46 years. RESULTS: Of the 99 women, 18 had bilateral dermoid cysts. Multiple dermoid cysts in a single ovary were found in nine of the women with bilateral cysts and in one of the remaining patients. Two patients developed malignant germ cell tumors, and three developed a recurrent dermoid cyst in an ovary from which a dermoid cyst had previously been extracted. Bilateral or multiple ovarian dermoid cysts were present at the initial operation in four (80%) of these patients. CONCLUSIONS: Women with bilateral or multiple dermoid cysts may include a subgroup of patients with a greater tendency to develop future ovarian germ cell neoplasms.

Risk of fetal loss in twin pregnancies undergoing second trimester amniocentesis(1).

OBJECTIVE: To assess the rate of fetal loss among bichorionic twin gestations undergoing genetic amniocentesis compared with singletons undergoing the procedure and untested twins. METHODS: In a retrospective cohort study, three groups were compared: 476 women with twins undergoing amniocentesis, 489 women with singleton gestations undergoing amniocentesis, and 477 women with twins presenting at a similar gestational age for ultrasound studies only. All subjects were scanned at 17-18 weeks' gestation and again approximately 4 weeks after the procedure or first ultrasound scan. Excluded were twin pregnancies after fetal reduction or chorionic villus sampling, fetuses with structural anomalies, and cases in which one fetus had died at the time of examination or after fetal reduction. RESULTS: Thirteen twin gestations in the tested group (2.73%) aborted spontaneously up to 4 weeks after the procedure compared with three twin controls (0.63%, P =.01) and three post-procedure singleton controls (0.6%, P =.01). An abnormal karyotype was discovered in 15 tested twin pregnancies (3%) and in six tested singletons (1.23%). All affected twin pairs were discordant for the chromosomal anomaly. CONCLUSION: The risk of early fetal loss in twins undergoing amniocentesis appears to be higher than that of exposed singletons or unexposed twins.

Intrauterine device failure: relation to its location within the uterine cavity.

OBJECTIVE: To investigate the possible role of position of the intrauterine device (IUD) in accidental pregnancies. METHODS: We examined the location of the IUD in 97 normal women 45-60 days post-insertion, and in 25 pregnant women with the device in situ. RESULTS: A cervically located IUD was identified in seven of 97 women (7.2%) after insertion and in 13 of 25 pregnant women (52%) with the device in situ. The odds ratio for a woman with an intracervical IUD to be pregnant compared with a woman with an IUD in the uterus was 13.93 (95% confidence limits 4.13-48.96). Sonographic follow-up of the pregnant women revealed no change in IUD location during early gestation. CONCLUSIONS: We suggest that cases of failed contraceptive action of the IUD may be secondary to a malpositioned device. A sonographic survey can identify displaced devices. Reinsertion of the IUD in such cases is recommended.

The effect of ethinyl estradiol on endometrial thickness and uterine volume during ovulation induction by clomiphene citrate.

OBJECTIVE: To assess the deleterious effect of clomiphene citrate (CC) on the development of the endometrium and its improvement by the addition of ethinyl estradiol (E2). PARTICIPATING PATIENTS: Infertility-treated patients, monitored for induction of ovulation or timing of insemination (control group). DESIGN: We studied four groups of women during an ovulatory cycle with various treatment schedules. Group 1: untreated patients; group 2: patients treated by CC; group 3: patients treated by CC + ethinyl E2; group 4: patients treated by human menopausal gonadotropin. Follow-up of the patients was done by vaginal ultrasonography and measurements of blood E2. RESULTS: In the group treated by CC, both endometrial thickness and uterine volume growth during the follicular phase were lower as compared with untreated controls and menotropin-treated patients. The addition of ethinyl E2 to these patients reversed this deleterious effect of CC without interfering with ovulation. CONCLUSION: Ethinyl E2 may reverse the deleterious effect of CC on endometrial development during the follicular phase.

Characterization of intraperitoneal cytokines and nitrites in women with severe ovarian hyperstimulation syndrome.

OBJECTIVE: To assess the potential involvement of cytokines and nitrites in the hyperpermeability characterizing the ovarian hyperstimulation syndrome (OHSS). DESIGN: A controlled clinical study comparing peritoneal fluid (PF) from patients with severe OHSS and from non-OHSS controls. SETTING: Women hospitalized with severe OHSS in three tertiary medical centers. PATIENTS: Twelve patients with severe OHSS necessitating paracentesis and 20 non-OHSS controls. INTERVENTIONS: The criteria for ultrasound-guided paracentesis were tense ascites, hydrothorax, hemoconcentration, or oliguria. MAIN OUTCOME MEASURES: Interleukin (IL) 1 beta IL-1 receptor agonist, IL-2, IL-6, IL-8, and tumor necrosis factor alpha (TNF alpha) levels in PF were assayed by ELISA; nitrites were measured by the "Griess" reaction. Estradiol and P were determined by RIA. RESULTS: Ovarian hyperstimulation syndrome patients had significantly higher PF IL-6 (3,523 versus 30 pg/mL), TNF alpha (14 versus 4.2 pg/mL), and IL-8 (1,695 versus 900 pg/mL). In the serum, only IL-6 levels were significantly higher (375 versus 11 pg/mL). Conversely, nitrite levels were significantly lower in PF of OHSS patients (0.5 versus 34 nmol/mL). Interleukin 1 levels were higher and IL-1 receptor antagonist levels were lower in OHSS patients, suggesting potentially increased biologic potency of IL-1. CONCLUSION: These findings suggest that these substances could be involved in mediating the capillary hyperpermeability characterizing this syndrome.