Mode of delivery in chorioamnionitis: impact on neonatal and maternal outcomes.

BACKGROUND: The impact of mode of delivery in chorioamnionitis on neonatal outcomes is unclear. This retrospective cohort study compares the rate of early onset neonatal sepsis between vaginal delivery and cesarean section. METHODS: Singleton pregnancies at greater than 24 + 0 weeks gestation with live birth and clinically-diagnosed chorioamnionitis from January 1, 2019 to December 31, 2021 were included. Cases with multiple gestations, terminations or histological chorioamnionitis alone were excluded. Rates of early onset neonatal sepsis, select secondary neonatal outcomes and a composite outcome of maternal infectious morbidity were compared using propensity score weighting. Subgroup analysis was done by indication for cesarean section. RESULTS: After chart review, 378 cases were included with 197 delivering vaginally and 181 delivering via cesarean section. The groups differed on age, parity, hypertension, renal disease, gestational age, corticosteroid use, magnesium sulfate use, presence of meconium and percentage meeting Gibbs criteria before propensity score weighting. Rate of early onset neonatal sepsis was greater in the cesarean section group (13.8% versus 3.1%, adjusted risk difference 8.3% [3.5-13.1], p < 0.001). Secondary neonatal outcomes were similar between groups. When compared by indication, the rate of early onset neonatal sepsis was greater in the cesarean section for abnormal fetal surveillance group compared to vaginal delivery but not in the cesarean section for other reasons group. Adjusted rates of secondary neonatal outcomes did not differ between groups. The rate of maternal infectious morbidity was greater with cesarean section. (13.8% versus 1.5% [adjusted risk difference 13.0% [7.1-18.9], p < 0.0001). No other difference in maternal secondary outcomes was identified. CONCLUSIONS: The rate of early onset neonatal sepsis was highest in the cesarean section group, particularly in those with abnormal fetal surveillance. Fetuses affected by or vulnerable to sepsis likely have a greater need for cesarean section.

Characteristics and Management of Chorioamnionitis at an Academic Centre in Ontario Before and After Implementation of an Order Set.

OBJECTIVES: Chorioamnionitis has implications for parturient and neonatal outcomes but is difficult to diagnose accurately. The particulars of management also differ between providers and between institutions. Clinical order sets have been shown to standardize and improve care. This study compares characteristics of chorioamnionitis and aspects of management before and after implementation of an order set. METHODS: Chart review facilitated comparison of 76 cases occurring prior to implementation of the order set and 66 cases occurring after. Characteristics of chorioamnionitis used for diagnosis and particulars of management were assessed. RESULTS: There was no significant difference in baseline characteristics between the groups. Parturient tachycardia was more prevalent in cases occurring after implementation of the order set but there was no difference in the percentage of cases meeting Gibb's criteria. Management of cases pre- and post-implementation of the order set differed only in antibiotic choice. Percentage of cases with blood cultures or placental examination performed did not differ. CONCLUSIONS: Overall, implementation of the order set did not significantly impact diagnosis of chorioamnionitis and altered management only with respect to antibiotic choice.

The impact on complication rates of delayed routine pessary reviews during the COVID-19 pandemic.

INTRODUCTION AND HYPOTHESIS: During the COVID-19 pandemic, guidance was issued in the United Kingdom advising a delay in routine pessary reviews. The impact of this has not been fully explored. The null hypothesis for this study is that delayed routine pessary reviews during the COVID-19 pandemic did not result in a statistically significant increase in complication rate. METHODS: A retrospective comparative cohort study was conducted in NHS Tayside, Scotland, involving 150 patients pre-pandemic and 150 patients during the COVID-19 pandemic (before exclusions). Their notes were reviewed identifying age, care provider, pessary type, length of pessary usage, review date, time elapsed since the previous review, bleeding/infection/ulceration, removal issues, pessary replacement and outcome. Patients excluded were those with no pessary in situ at review, reviews at ≤4 months and >8 months (pre-pandemic) and reviews at ≤8 months (COVID-19 pandemic). RESULTS: The pre-pandemic group (n=106) had average review times of 10.1,6.2 and 6.2 months for cubes, rings and all others. Overall rates of bleeding/infection/ulceration; reported removal issues; and pessary subsequently not replaced were 9.4%, 11.3% and 5.7% respectively. The COVID-19 pandemic group (n=125) had average review times of 14.7, 10.8 and 11.4 months for cubes, rings and all others. Overall rates of bleeding/infection/ulceration; reported removal issues; and pessary subsequently not replaced were 21.6%, 16.0%, and 12.0% respectively. CONCLUSIONS: Overall, there was a significant increase in rates of bleeding/ulceration/infection (p=0.01). When individual pessaries were considered, this only remained true for rings (p=0.02). Our data would suggest that routine ring pessary reviews should not be extended beyond 6 months or risk bleeding/ulceration/infection.

Introducing assisted reproductive technologies in The Gambia, a survey on the perspectives of Gambian healthcare professionals and medical students.

BACKGROUND: Infertility remains a global reproductive health burden with the highest prevalence in low and middle-income countries. In sub-Saharan Africa, the ability to procreate holds great societal importance. Couples, and particularly women, with infertility can face devastating challenges, leading to social stigma, isolation and/or divorce. However, attention to addressing infertility is lacking in sub-Saharan Africa. In The Gambia, where this study is based, little is known about the potential for introduction of assisted reproductive technologies (ART) in the public health sector. METHODS: A quantitative survey was conducted using detailed questionnaires on infertility services available, staff knowledge, perceived barriers, and personal motivation to support assisted reproductive technologies. Data was collected electronically between April and June 2021 from healthcare providers (n = 70) in eleven health facilities throughout the country, as well as from medical students (n = 55) enrolled at The University of The Gambia. RESULTS: Basic infertility services were found to be lacking in the rural areas. Furthermore, 39% of staff (n = 27) providing fertility care had not receive any formal training on the topic. However, 91% of staff (n = 64) showed interest in acquiring additional knowledge and had a positive attitude towards supporting the introduction of ART. Perceived challenges of doing so included: (i) the competing importance of other health priorities; and (ii) religious and cultural barriers. CONCLUSION: This survey highlights that expansion of infertility services is needed, especially in rural areas. Staff perceived the introduction of ART as important, but this should be coupled with specialized training, as most medical staff had not received any formal infertility training. Future care providers (current medical students) showed both interest in ART and reported having received some basic training in infertility management. Given the reported lack of infrastructure and services, additional targeted investment in infertility care, including ART, will be needed to improve reproductive health for all, countrywide.

In Sub-Saharan Africa, the prevalence of involuntary childlessness (infertility) is high. However, services to help address this problem are inconsistent or lacking ­ including in the West African country of The Gambia, where this study was conducted. There is currently limited information on the infrastructure available and the level of knowledge and training among healthcare providers in the country to help address this issue. To address this gap in knowledge, we conducted a survey with health staff from different hospitals and with medical students at the University of The Gambia. The survey focused on the reported availability of services as well as participants' knowledge and training in both basic and advanced treatments for infertility. We found a major lack of infertility care services in rural areas. Furthermore, staff knowledge about infertility was minimal, and there was little knowledge about more advanced infertility care services, such as in vitro fertilization (IVF). The survey also found that staff and students perceived other health priorities and religion as major barriers for ART introduction. Staff noted that government funding for infertility treatment is minimal. In conclusion, this survey found a lack of reported infrastructure for infertility in rural areas of The Gambia, as well as a lack of formal training by staff. However, both staff and students showed interest in the potential introduction of ART. Overall, this survey highlights that more investment and training is needed to implement changes in order to modernize reproductive healthcare in The Gambia, in particular for those who face infertility.

Methodological and Reporting Quality of Noninferiority Randomized Controlled Trials Comparing Antibiotic Therapies: A Systematic Review.

BACKGROUND: Antibiotic noninferiority randomized controlled trials (RCTs) are used for approval of new antibiotics and making changes to antibiotic prescribing in clinical practice. We conducted a systematic review to assess the methodological and reporting quality of antibiotic noninferiority RCTs. METHODS: We searched MEDLINE, Embase, the Cochrane Database of Systematic Reviews, and the Food and Drug Administration drug database from inception until November 22, 2019, for noninferiority RCTs comparing different systemic antibiotic therapies. Comparisons between antibiotic types, doses, administration routes, or durations were included. Methodological and reporting quality indicators were based on the Consolidated Standards of Reporting Trials reporting guidelines. Two independent reviewers extracted the data. RESULTS: The systematic review included 227 studies. Of these, 135 (59.5%) studies were supported by pharmaceutical industry. Only 83 (36.6%) studies provided a justification for the noninferiority margin. Reporting of both intention-to-treat (ITT) and per-protocol (PP) analyses were done in 165 (72.7%) studies. The conclusion was misleading in 34 (15.0%) studies. The studies funded by pharmaceutical industry were less likely to be stopped early because of logistical reasons (3.0% vs 19.1%; odds ratio [OR] = 0.13; 95% confidence interval [CI], .04-.37) and to show inconclusive results (11.1% vs 42.9%; OR = 0.17; 95% CI, .08-.33). The quality of studies decreased over time with respect to blinding, early stopping, reporting of ITT with PP analysis, and having misleading conclusions. CONCLUSIONS: There is room for improvement in the methodology and reporting of antibiotic noninferiority trials. Quality can be improved across the entire spectrum from investigators, funding agencies, as well as during the peer-review process.There is room for improvement in the methodology and reporting of antibiotic noninferiority trials including justification of noninferiority margin, reporting of intention-to-treat analysis with per-protocol analysis, and having conclusions that are concordant with study results.Clinical Trials Registration PROSPERO registration number CRD42020165040.

Family History of Hypertension, Cardiovascular Disease, or Diabetes and Risk of Developing Preeclampsia: A Systematic Review.

Preeclampsia is a severe pregnancy complication with high potential for adverse effects on maternal and fetal health during the perinatal period. It is also associated with an increased risk of maternal cardiovascular disease later in life. Development of preeclampsia can be decreased by prescribing low-dose aspirin to high-risk women. At present, maternal and pregnancy factors are used to assess the risk of preeclampsia. One additional factor that could add to the assessment of risk is a family history of hypertension, cardiovascular disease, or diabetes, especially for nulliparous women who do not have a pregnancy history to inform treatment decisions. Therefore, we conducted a systematic review to assess the association between family history of the aforementioned conditions and preeclampsia. Four databases including MEDLINE, EMBASE, the Cochrane Library, and CINAHL/pre-CINAHL were searched for observational studies that examined a family history of hypertension, cardiovascular disease, or diabetes in women with preeclampsia and in a control population. Studies were evaluated for quality using the Newcastle-Ottawa Scale. A total of 84 relevant studies were identified. A meta-analysis was not conducted due to suspected heterogeneity in the included studies. Most studies reported a positive association between a family history of hypertension or cardiovascular disease and the development of preeclampsia. The majority of studies examining family history of diabetes reported non-significant associations. Overall, family history of hypertension or cardiovascular disease is associated with a higher risk for developing preeclampsia and should be considered when assessing women in the first trimester for low-dose aspirin.

Preeclampsia may influence offspring neuroanatomy and cognitive function: a role for placental growth factor†.

Preeclampsia (PE) is a common pregnancy complication affecting 3-5% of women. Preeclampsia is diagnosed clinically as new-onset hypertension with associated end organ damage after 20 weeks of gestation. Despite being diagnosed as a maternal syndrome, fetal experience of PE is a developmental insult with lifelong cognitive consequences. These cognitive alterations are associated with distorted neuroanatomy and cerebrovasculature, including a higher risk of stroke. The pathophysiology of a PE pregnancy is complex, with many factors potentially able to affect fetal development. Deficient pro-angiogenic factor expression is one aspect that may impair fetal vascularization, alter brain structure, and affect future cognition. Of the pro-angiogenic growth factors, placental growth factor (PGF) is strongly linked to PE. Concentrations of PGF are inappropriately low in maternal blood both before and during a PE gestation. Fetal concentrations of PGF appear to mirror maternal circulating concentrations. Using Pgf-/- mice that may model effects of PE on offspring, we demonstrated altered central nervous system vascularization, neuroanatomy, and behavior. Overall, we propose that development of the fetal brain is impaired in PE, making the offspring of preeclamptic pregnancies a unique cohort with greater risk of altered cognition and cerebrovasculature. These individuals may benefit from early interventions, either pharmacological or environmental. The early neonatal period may be a promising window for intervention while the developing brain retains plasticity.

Effects of placental growth factor deficiency on behavior, neuroanatomy, and cerebrovasculature of mice.

Preeclampsia, a hypertensive syndrome occurring in 3-5% of human pregnancies, has lifelong health consequences for fetuses. Cognitive ability throughout life is altered, and adult stroke risk is increased. One potential etiological factor for altered brain development is low concentrations of proangiogenic placental growth factor (PGF). Impaired PGF production may promote an antiangiogenic fetal environment during neural and cerebrovascular development. We previously reported delayed vascularization of the hindbrain, altered retinal vascular organization, and less connectivity in the circle of Willis in Pgf-/- mice. We hypothesized Pgf-/- mice would have impaired cognition and altered brain neuroanatomy in addition to compromised cerebrovasculature. Cognitive behavior was assessed in adult Pgf-/- and Pgf+/+ mice by four paradigms followed by postmortem high-resolution MRI of neuroanatomy. X-ray microcomputed tomography imaging investigated the three-dimensional cerebrovascular geometry in another cohort. Pgf-/- mice exhibited poorer spatial memory, less depressive-like behavior, and superior recognition of novel objects. Significantly smaller volumes of 10 structures were detected in the Pgf-/- compared with Pgf+/+ brain. Pgf-/- brain had more total blood vessel segments in the small-diameter range. Lack of PGF altered cognitive functions, brain neuroanatomy, and cerebrovasculature in mice. Pgf-/- mice may be a preclinical model for the offspring effects of low-PGF preeclampsia gestation.

Influences of placental growth factor on mouse retinal vascular development.

BACKGROUND: Placental growth factor (PGF) is important for wound-healing and vascular collaterogenesis. PGF deficiency is associated with preeclampsia, a hypertensive disease of human pregnancy. Offspring born to preeclamptic mothers display cognitive impairments and brain vascular and neurostructural deviations. Low PGF production during development may contribute to alterations in offspring cerebrovascular beds. Retina is a readily accessible part of the central nervous system with a well-described pattern of vascular development in mice. Impacts of PGF deficiency were addressed during mouse retinal vascularization. RESULTS: Retinal vessels were compared between Pgf-/- and congenic C57BL/6 (B6) mice. PGF deficiency altered neonatal retinal vascularization patterns. Some anatomic alterations persisted into adulthood, particularly in males. Greater arterial wall collagen IV expression was found in adult Pgf-/- females. Pregnancy (studied in adult females at gestational days 11.5 or 18.5) induced subtle changes upon the mother's retinal vasculature but these pregnancy-induced changes did not differ between genotypes. Significant sex-related differences occurred between adult male and female B6 although sexually dimorphic retinal vascular differences were absent in B6 neonates. CONCLUSIONS: Overall, PGF has a role in retinal vascular angiogenesis and vessel organization during development but does not affect retinal vessel adaptations in adult females during pregnancy. Developmental Dynamics 246:700-712, 2017. © 2017 Wiley Periodicals, Inc.

An audit of Ninewells Hospital fertility preservation service.

BACKGROUND: Infertility is a devastating consequence of some medical and surgical interventions. Men can protect their fertility by storing or 'banking' sperm before beginning treatment. This is called fertility preservation. Fertility preservation is traditionally offered to cancer patients undergoing gonadotoxic therapy. AIMS: This study reports the results of an audit of the Ninewells Hospital fertility preservation service. It aims to characterise the patients who attended our service and assess their utilisation rate and outcome of treatment. METHOD: A retrospective study carried out between January 2000 and March 2017. Data was collected using a combination of laboratory and clinical records. RESULTS: A total of 296 patients attended for fertility preservation, of which 264 banked sperm. The number of men referred for sperm banking increased during the study period from 3 in 2000 to 26 in 2016. Testicular cancer (41.7%) was the most common indication followed by, haematological malignancies (33.0%), other malignancies (15.2%) and benign disease (10.2%). The proportion of men with benign disease increased over-time and accounted for 15% of all patients since 2015. At the time of sperm banking, the median age was 29.8 years. Fourteen men (5.3%) returned for fertility treatment with their banked sperm after an average of 40.8 months. After a total of 32 treatment cycles, 12 babies were born (6 singletons and 3 twins). Eight of the fourteen couples succeeded in having at least one child (57.1%). A small proportion of men engaged in fertility monitoring (9.5%) or disposed of their banked sperm (5.7%). CONCLUSIONS: There is an increasing demand for fertility preservation, especially from patients with benign disease. Only a small proportion of men utilised their banked sperm, however, those that did had a good chance of becoming fathers. Data from this study will be used to review our referral pathways and inform our future practice.

Placental growth factor deficiency is associated with impaired cerebral vascular development in mice.

STUDY HYPOTHESIS: Placental growth factor (PGF) is expressed in the developing mouse brain and contributes to vascularization and vessel patterning. STUDY FINDING: PGF is dynamically expressed in fetal mouse brain, particularly forebrain, and is essential for normal cerebrovascular development. WHAT IS KNOWN ALREADY: PGF rises in maternal plasma over normal human and mouse pregnancy but is low in many women with the acute onset hypertensive syndrome, pre-eclampsia (PE). Little is known about the expression of PGF in the fetus during PE. Pgf  (-/-) mice appear normal but recently cerebral vascular defects were documented in adult Pgf  (-/-) mice. STUDY DESIGN, SAMPLES/MATERIALS, METHODS: Here, temporal-spatial expression of PGF is mapped in normal fetal mouse brains and cerebral vasculature development is compared between normal and congenic Pgf  (-/-) fetuses to assess the actions of PGF during cerebrovascular development. Pgf/PGF, Vegfa/VEGF, Vegf receptor (Vegfr)1 and Vegfr2 expression were examined in the brains of embryonic day (E)12.5, 14.5, 16.5 and 18.5 C57BL/6 (B6) mice using quantitative PCR and immunohistochemistry. The cerebral vasculature was compared between Pgf  (-/-) and B6 embryonic and adult brains using whole mount techniques. Vulnerability to cerebral ischemia was investigated using a left common carotid ligation assay. MAIN RESULTS AND THE ROLE OF CHANCE: Pgf/PGF and Vegfr1 are highly expressed in E12.5-14.5 forebrain relative to VEGF and Vegfr2. Vegfa/VEGF is relatively more abundant in hindbrain (HB). PGF and VEGF expression were similar in midbrain. Delayed HB vascularization was seen at E10.5 and 11.5 in Pgf  (-/-) brains. At E14.5, Pgf  (-/-) circle of Willis showed unilateral hypoplasia and fewer collateral vessels, defects that persisted post-natally. Functionally, adult Pgf  (-/-) mice experienced cerebral ischemia after left common carotid arterial occlusion while B6 mice did not. LIMITATIONS, REASONS FOR CAUTION: Since Pgf  (-/-) mice were used, consequences of complete absence of maternal and fetal PGF were defined. Therefore, the effects of maternal versus fetal PGF deficiency on cerebrovascular development cannot be separated. However, as PGF was strongly expressed in the developing brain at all timepoints, we suggest that local PGF has a more important role than distant maternal or placental sources. Full PGF loss is not expected in PE pregnancies, predicting that the effects of PGF deficiency identified in this model will be more severe than any effects in PE-offspring. WIDER IMPLICATIONS OF THE FINDINGS: These studies provoke the question of whether PGF expression is decreased and cerebral vascular maldevelopment occurs in fetuses who experience a preeclamptic gestation. These individuals have already been reported to have elevated risk for stroke and cognitive impairments. LARGE SCALE DATA: N/A. STUDY FUNDING AND COMPETING INTERESTS: This work was supported by awards from the Natural Sciences and Engineering Research Council, the Canada Research Chairs Program and the Canadian Foundation for Innovation to B.A.C. and by training awards from the Universidade Federal de Pernambuco and Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Brazil to R.L.L.; Queen's University to V.R.K. and the Canadian Institutes of Health Research to M.T.R. The work of P.C. is supported by the Belgian Science Policy BELSPO-IUAP7/03, Structural funding by the Flemish Government-Methusalem funding, and the Flemish Science Fund-FWO grants. There were no competing interests.

Uterine natural killer cells: supervisors of vasculature construction in early decidua basalis.

Mammalian pregnancy involves tremendous de novo maternal vascular construction to adequately support conceptus development. In early mouse decidua basalis (DB), maternal uterine natural killer (uNK) cells oversee this process directing various aspects during the formation of supportive vascular networks. The uNK cells recruited to early implantation site DB secrete numerous factors that act in the construction of early decidual vessels (neoangiogenesis) as well as in the alteration of the structural components of newly developing and existing vessels (pruning and remodeling). Although decidual and placental development sufficient to support live births occur in the absence of normally functioning uNK cells, development and structure of implantation site are optimized through the presence of normally activated uNK cells. Human NK cells are also recruited to early decidua. Gestational complications including recurrent spontaneous abortion, fetal growth restriction, preeclampsia, and preterm labor are linked with the absence of human NK cell activation via paternally inherited conceptus transplantation antigens. This review summarizes the roles that mouse uNK cells normally play in decidual neoangiogenesis and spiral artery remodeling in mouse pregnancy and briefly discusses changes in early developmental angiogenesis due to placental growth factor deficiency.

Reproductive and developmental effects of phthalate diesters in males.

Phthalate diesters are a diverse group of chemicals used to make plastics flexible and are found in personal care products, medical equipment, and medication capsules. Ubiquitous in the environment, human exposure to phthalates is unavoidable; however, the clinical relevance of low concentrations in human tissues remains uncertain. The epidemiological literature was inadequate for prior reviews to conclusively evaluate the effects of phthalates on male reproductive tract development and function, but recent studies have expanded the literature. Therefore, we conducted a systematic review of the literature focused on the effects of phthalate exposure on the developing male reproductive tract, puberty, semen quality, fertility, and reproductive hormones. We conclude that although the epidemiological evidence for an association between phthalate exposure and most adverse outcomes in the reproductive system, at concentrations to which general human populations are exposed, is minimal to weak, the evidence for effects on semen quality is moderate. Results of animal studies reveal that, although DEHP was the most potent, different phthalates have similar effects and can adversely affect development of the male reproductive tract with semen quality being the most sensitive outcome. We also note that developmental exposure in humans was within an order of magnitude of the adverse effects documented in several animal studies. While the mechanisms underlying phthalate toxicity remain unclear, the animal literature suggests that mice are less sensitive than rats and potentially more relevant to estimating effects in humans. Potential for chemical interactions and effects across generations highlights the need for continued study.

The clinical significance of calcium-signalling pathways mediating human sperm hyperactivation.

STUDY QUESTION: What is the prevalence of defects in the Ca(2+)-signalling pathways mediating hyperactivation (calcium influx and store mobilization) among donors and sub-fertile patients and are they functionally significant, i.e. related to fertilization success at IVF? SUMMARY ANSWER: This study identifies, for the first time, the prevalence of Ca(2+) store defects in sperm from research donors, IVF and ICSI patients. It highlights the biological role and importance of Ca(2+) signalling (Ca(2+) store mobilization) for fertilization at IVF. WHAT IS KNOWN ALREADY: Sperm motility and hyperactivation (HA) are important for fertility, mice with sperm incapable of HA are sterile. Recently, there has been significant progress in our knowledge of the factors controlling these events, in particular the generation and regulation of calcium signals. Both pH-regulated membrane Ca(2+) channels (CatSper) and Ca(2+) stores (potentially activating store-operated Ca(2+) channels) have been implicated in controlling HA. STUDY DESIGN, SIZE, AND DURATION: This was a prospective study examining a panel of 68 donors and 181 sub-fertile patients attending the Assisted Conception Unit, Ninewells Hospital Dundee for IVF and ICSI. Twenty-five of the donors gave a second sample (∼4 weeks later) to confirm consistency/reliability of the recorded responses. Ca(2+) signalling was manipulated using three agonists, NH4Cl (activates CatSper via pH), progesterone (direct activation of CatSper channels, potentially enhancing mobilization of stored Ca(2+) by CICR) and 4-aminopyridine (4-AP) (effect on pH equivalent to NH4Cl and mobilizes stored Ca(2+)). The broad-spectrum phosphodiesterase inhibitor 3-isobutyl-1-methyxanthine (IBMX), a potent activator of HA was also used for comparison. For patient samples, an aliquot surplus to requirements for IVF/ICSI treatment was examined, allowing direct comparison of Ca(2+) signalling and motility data with functional competence of the sperm. MATERIALS, SETTING, METHODS: The donors and sub-fertile patients were screened for HA (using CASA) and changes in intracellular Ca(2+) were assessed by loading with Fura-2 and measuring fluorescence using a plate reader (FluoStar). MAIN RESULTS AND THE ROLE OF CHANCE: The relative efficacy of the stimuli in inducing HA was 4-AP >> IBMX > progesterone. NH4Cl increased [Ca(2+)]i similarly to 4-AP and progesterone but did not induce a significant increase in HA. Failure of samples to generate HA (no significant increase in response to stimulation with 4-AP) was seen in just 2% of research donors but occurred in 10% of IVF patients (P = 0.025). All donor samples generated a significant [Ca(2+)]i increase when stimulated with 4-AP but 3.3% of IVF and 28.6% of ICSI patients failed to respond. Amplitudes of HA and [Ca(2+)]i responses to 4-AP were correlated with fertilization rate at IVF (P= 0.029; P = 0.031, respectively). Progesterone reliably induced [Ca(2+)]i responses (97% of donors, 100% of IVF patients) but was significantly less effective than 4-AP in inducing HA. Twenty seven per cent of ICSI patients failed to generate a [Ca(2+)]i response to progesterone (P= 0.035). Progesterone-induced [Ca(2+)]i responses were correlated with fertilization rate at IVF (P= 0.037) but induction of HA was not. In donor samples examined on more than one occasion consistent responses for 4-AP-induced [Ca(2+)]i (R(2) = 0.97) and HA (R(2) = 0.579) were obtained. In summary, the data indicate that defects in Ca(2+) signalling leading to poor HA do occur and that ability to undergo Ca(2+) -induced HA affects IVF fertilizing capacity. The data also confirm that release of stored Ca(2+) is the crucial component of Ca(2+) signals leading to HA and that Ca(2+) store defects may therefore underlie HA failure. LIMITATIONS, REASONS FOR CAUTION: This is an in vitro study of sperm function. While the repeatability of the [Ca(2+)]i and HA responses in samples from the same donor were confirmed, data for patients were from 1 assessment and thus the robustness of the failed responses in patients' needs to be established. The focus of this study was on using 4AP, which mobilizes stored Ca(2+) and is a potent inducer of HA. The n values for other agonists, especially calcium assessments, are smaller. WIDER IMPLICATIONS OF THE FINDINGS: Previous studies have shown a significant relationship between basal levels of HA, calcium responses to progesterone and IVF fertilization rates. Here, we have systematically investigated the ability/failure of human sperm to generate Ca(2+) signals and HA in response to targeted pharmacological challenge and, related defects in these responses to IVF success. [Ca(2+)]i signalling is fundamental for sperm motility and data from this study will lead to assessment of the nature of these defects using techniques such as single-cell imaging and patch clamping. STUDY FUNDING/COMPETING INTEREST(S): Resources from a Wellcome Trust Project Grant (#086470, Publicover and Barratt PI) primarily funded the study. The authors have no competing interests.

Reproductive and developmental effects of phthalate diesters in females.

Phthalate diesters, widely used in flexible plastics and consumer products, have become prevalent contaminants in the environment. Human exposure is ubiquitous and higher phthalate metabolite concentrations documented in patients using medications with phthalate-containing slow release capsules raises concerns for potential health effects. Furthermore, animal studies suggest that phthalate exposure can modulate circulating hormone concentrations and thus may be able to adversely affect reproductive physiology and the development of estrogen sensitive target tissues. Therefore, we conducted a systematic review of the epidemiological and experimental animal literature examining the relationship between phthalate exposure and adverse female reproductive health outcomes. The epidemiological literature is sparse for most outcomes studied and plagued by small sample size, methodological weaknesses, and thus fails to support a conclusion of an adverse effect of phthalate exposure. Despite a paucity of experimental animal studies for several phthalates, we conclude that there is sufficient evidence to suggest that phthalates are reproductive toxicants. However, we note that the concentrations needed to induce adverse health effects are high compared to the concentrations measured in contemporary human biomonitoring studies. We propose that the current patchwork of studies, potential for additive effects and evidence of adverse effects of phthalate exposure in subsequent generations and at lower concentrations than in the parental generation support the need for further study.

Human oocytes express ATP-sensitive K(+) channels.

BACKGROUND: ATP-sensitive K(+) (K(ATP)) channels link intracellular metabolism with membrane excitability and play crucial roles in cellular physiology and protection. The K(ATP) channel protein complex is composed of pore forming, Kir6.x (Kir6.1 or Kir6.2) and regulatory, SURx (SUR2A, SUR2B or SUR1), subunits that associate in different combinations. The objective of this study was to determine whether mammalian oocytes (human, bovine, porcine) express K(ATP) channels. METHODS: Supernumerary human oocytes at different stages of maturation were obtained from patients undergoing assisted conception treatments. Bovine and porcine oocytes in the germinal vesicle (GV) stage were obtained by aspirating antral follicles from abattoir-derived ovaries. The presence of mRNA for K(ATP) channel subunits was determined using real-time RT-PCR with primers specific for Kir6.2, Kir6.1, SUR1, SUR2A and SUR2B. To assess whether functional K(ATP) channels are present in human oocytes, traditional and perforated patch whole cell electrophysiology and immunoprecipitation/western blotting were used. RESULTS: Real-time PCR revealed that mRNA for Kir6.1, Kir6.2, SUR2A and SUR2B, but not SUR1, were present in human oocytes of different stages. Only SUR2B and Kir6.2 mRNAs were detected in GV stage bovine and porcine oocytes. Immunoprecipitation with SUR2 antibody and western blotting with Kir6.1 antibody identified bands corresponding to these subunits in human oocytes. In human oocytes, 2,4-dinitrophenol (400 µM), a metabolic inhibitor known to decrease intracellular ATP and activate K(ATP) channels, increased whole cell K(+) current. On the other hand, K(+) current induced by low intracellular ATP was inhibited by extracellular glibenclamide (30 µM), an oral antidiabetic known to block the opening of K(ATP) channels. CONCLUSIONS: In conclusion, mammalian oocytes express K(ATP) channels. This opens a new avenue of research into the complex relationship between metabolism and membrane excitability in oocytes under different conditions, including conception.

Clinical biochemistry of assisted conception.

Assisted reproductive technology has shown rapid advancement since the birth of the first 'test-tube' baby in Oldham, UK, in 1978. Since April 2005, women between the ages of 23 and 39, who meet the described eligibility criteria, are able to get one free in vitro fertilization cycle funded by the National Health Service. Private treatment costs anything from pound4000 to pound8000 for a single cycle of treatment. Almost 15% of the couples in UK are affected by fertility problems and undergo detailed investigations before being offered assisted conception. Assisted reproduction is the collective name for treatments designed to lead to conception by means other than sexual intercourse. These include intrauterine insemination, in vitro fertilization, intracytoplasmic sperm injection and gamete donation. This review is intended to summarize the principles of assisted conception and examine the role of the biochemistry laboratory in: (A) the diagnosis and subsequent management of ovulatory disorders; (B) assessing ovarian reserve before initiating fertility treatment and (C) monitoring fertility treatment. It touches on the screening of potential gamete donors and follow-up of children born after assisted conception. This article was prepared at the invitation of the Clinical Sciences Reviews Committee of the Association of Clinical Biochemistry.

Adult Pgf-/- mice behaviour and neuroanatomy are altered by neonatal treatment with recombinant placental growth factor.

Offspring of preeclamptic pregnancies have cognitive alterations. Placental growth factor (PGF), is low in preeclampsia; reduced levels may affect brain development. PGF-null mice differ from normal congenic controls in cerebrovasculature, neuroanatomy and behavior. Using brain imaging and behavioral testing, we asked whether developmentally asynchronous (i.e. neonatal) PGF supplementation alters the vascular, neuroanatomic and/or behavioral status of Pgf-/- mice at adulthood. C57BL/6-Pgf-/- pups were treated intraperitoneally on postnatal days 1-10 with vehicle or PGF at 10 pg/g, 70 pg/g or 700 pg/g. These mice underwent behavioral testing and perfusion for MRI and analysis of retinal vasculature. A second cohort of vehicle- or PGF-treated mice was perfused for micro-CT imaging. 10 pg/g PGF-treated mice exhibited less locomotor activity and greater anxiety-like behavior relative to vehicle-treated mice. Depressive-like behavior showed a sex-specific, dose-dependent decrease and was lowest in 700 pg/g PGF-treated females relative to vehicle-treated females. Spatial learning did not differ. MRI revealed smaller volume of three structures in the 10 pg/g group, larger volume of seven structures in the 70 pg/g group and smaller volume of one structure in the 700 pg/g group. No cerebral or retinal vascular differences were detected. Overall, neonatal PGF replacement altered behavior and neuroanatomy of adult Pgf-/- mice.

Controlled ovarian stimulation for in-vitro fertilization.

Controlled ovarian stimulation with gonadotrophins is an essential part of in-vitro fertilization treatment. The aim is to produce an optimum number of oocytes to maximize success in the safest possible way. Pituitary downregulation with a gonadotrophin-releasing hormone agonist and stimulation with recombinant follicle-stimulating hormone is used widely. However, there are many different protocols in use with little evidence to determine the optimum regimen. Markers of ovarian reserve and patient characteristics are used in an attempt to individualize treatment. However, these do not necessarily reflect the quality of the oocytes and resultant embryos. Inadequate doses of gonadotrophins can lead to a poor response resulting in treatment failure. However, higher doses can lead to a hyper response, resulting in ovarian hyperstimulation syndrome which is potentially life-threatening. Both poor and hyper response are associated with reduced pregnancy rates. Various strategies, such as electively freezing all the embryos, are being introduced to optimize outcomes while ensuring patient safety.

The Immunopathophysiology of Endometriosis.

Endometriosis is a chronic, inflammatory, estrogen-dependent disease characterized by the growth of endometrial tissue outside of the uterine cavity. Although the etiology of endometriosis remains elusive, immunological dysfunction has been proposed as a critical facilitator of ectopic lesion growth following retrograde menstruation of endometrial debris. However, it is not clear whether this immune dysfunction is a cause or consequence of endometriosis. Thus, here we provide in-depth insights into our current understanding of the immunopathophysiology of endometriosis and highlight challenges and opportunities for future research. With the explosion of successful immune-based therapies targeting various chronic inflammatory conditions, it is crucial to determine whether immune dysfunction can be therapeutically targeted in endometriosis.