استكشف المجموعة الواسعة من العناوين المتاحة.

Background The optimal time at which to perform a frozen-thawed embryo transfer (FET) following a failed in-vitro fertilization-embryo transfer (IVF-ET) attempt remains elusive to most reproductive experts. Physicians often delay the introduction of FET due to concerns related to potential residual effects of ovarian hyperstimulation which may interfere with the regular menstrual cycle. Moreover, given that most of the published studies on the topic are retrospective and have inconsistent findings, it is crucial to develop evidence-based randomized control guides for clinical practice. Therefore, this well-designed randomized controlled trial (RCT) was conducted to determine whether it is necessary to delay FET for at least one menstrual cycle after the failure of fresh embryo transfer. Methods Infertile women eligible for IVF-ET were invited to participate in this multicenter, randomized, non-inferiority, parallel-group, unblinded, controlled trial at the academic fertility centers of four public hospitals in Chinese Mainland. Infertile women scheduled to receive their first FET cycle after a failed IVF-ET attempt were randomly assigned to either (a) the immediate FET group in which FET was performed in the first menstrual cycle following the failed IVF-ET cycle (n = 366) or (b) the delayed FET group in which FET was performed in the second or subsequent menstrual cycle following the failed IVF-ET cycle (n = 366). All FET cycles were performed during hormone replacement cycles for endometrial preparation. The primary outcome was the ongoing pregnancy, defined as a detectable fetal heart beat beyond twelve weeks of gestation. Secondary outcomes were other pregnancy-related outcomes, maternal and neonatal complications. Analysis was performed by both intention-to-treat and per-protocol principles. Results A total of 646 FETs were completed. The frequency of moderate to severe depression and high stress level prior to FET in delayed FET group were significantly higher than that in immediate FET group (10.6% vs 6.1%, p  = 0.039; 30.3% vs 22.4%, p  = 0.022, respectively). Immediate FET resulted in a higher frequency of clinical pregnancy than did delayed FET (41.7% vs 34.1%), for a relative risk (RR) of 1.23 (95% confidence interval [CI], 1.00–1.50; p  = 0.045). Women who underwent immediate FET also had a lower frequency of biochemical pregnancy loss (11.7% vs. 30.6%), with a RR of 0.28 (95% CI 0.23–0.63, p  < 0.001), and a higher frequency of embryo implantation (25.2% vs. 20.2%), with a RR of 1.25 (95% CI 1.01–1.53; p  = 0.038). Although the ongoing pregnancy and live birth rates did not differ significantly between the immediate FET and delayed FET groups (37.1% vs 30.3%, RR 1.22, 95% CI 0.99–1.52, p  = 0.067; 36.5% vs 30.0%, RR 1.22, 95% CI 0.98–1.52, p  = 0.079, respectively), a multivariate logistic regression analysis adjusted for potential confounders such as depression and stress levels revealed that the immediate FET group had a significantly higher ongoing pregnancy and live birth rates than the delayed FET group (odds ratio 0.68, 95% CI 0.47–0.99, p  = 0.041; odds ratio 0.67, 95% CI 0.46–0.96, p  = 0.031). The risks of maternal and neonatal complications were comparable between the two groups. Conclusions In women with a previous failed IVF-ET attempt, immediate FET resulted in higher ongoing pregnancy and live birth rates than delayed FET. These findings warrant caution in the indiscriminate application of a delayed FET strategy when apparent risk of high stress level is perceived. Trial registration ChiCTR2000033313 .

BackgroundPhosphorous-containing flame-retardants (PFRs) are widely detected. They are used both as a flame retardant as well as plasticizer.MethodsA subset of 230 women and 229 men were recruited from Massachusetts General Hospital fertility clinic between 2005 and 2015. At each visit, participants completed a questionnaire of personal care product (PCP) and household product (HP) use. Metabolites [bis(1,3-dichloro-2-propyl) phosphate, diphenyl phosphate (DPHP), isopropylphenyl phenyl phosphate (ip-PPP), tert-butylphenyl phenyl phosphate and bis(1-chloro-2-propyl) phosphate] were measured in urine (1–5 samples; n = 638 women, n = 335 men). Associations were assessed using generalized mixed models, adjusted for SG, age, BMI, smoking, education, and season.ResultsIn women, moisturizer (60%), nail polish remover (77%), and nail polish (134%) use were associated (p < 0.05) with an increase in DPHP concentrations, while ip-PPP concentrations increased 21–27% with conditioner, cosmetics, deodorant, and hair product use. Mouthwash and vinyl glove use were associated with a respective 31% and 92% increase in DPHP among men.ConclusionsOur exploratory analysis suggests PFRs may be used as a plasticizer in consumer products, and nail polish use contributes to internal DPHP exposure. Further research is needed to understand how PFRs are used in these products and how it relates to exposure.

Background: Infertility is one of the critical health issues in Iran. There are more than 70 specialized infertility treatment centers in Iran, of which the Yazd Reproductive Sciences Institute, is one of the most important ones. Objective: This study aimed to determine the factors influencing infertile couples’ choice of Yazd Reproductive Sciences Institute. Materials and Methods: This cross-sectional study was conducted on 275 infertile couples aged 18 and older, referring to Yazd Reproductive Sciences Institute, Yazd, Iran from September 2021 to March 2022. Data were gathered using a 2-part questionnaire. Data analysis was done through SPSS software. We used descriptive statistics, Kruskal- Wallis, Mann-Whitney, and t test for data analysis. Results: Most participants were individuals who came from other provinces of Iran (74.9%) and were referred to the Yazd Reproductive Sciences Institute. Among the 4 categories that influenced couples’ decision to choose this center, factors related to the personnel and treatment staff received the highest score (75.83), while personal factors received the lowest score (65.76). The average score for factors related to doctors was 72.90, and for factors related to the center, it was 73.65. The satisfaction with personnel and treatment staff varied based on participants’ education levels, with those who had lower levels of education reporting higher levels of satisfaction (p < 0.001). Conclusion: The primary factors contributing to the success of the Yazd Reproductive Sciences Institute in attracting clients were the dedication and expertise of the staff, as well as the esteemed reputation of the doctors at the center. Key words: Infertility, Fertility clinics, Yazd, Iran.

IntroductionStandard survey measures of fertility preferences, such as the desire for and preferred timing of future births, do not capture the complexity of individuals’ preferences. New research focuses on additional dimensions of emotions and expectations surrounding childbearing. Few quantitative studies, however, consider the influence of all three dimensions of fertility preferences concurrently.MethodsUsing longitudinal survey data from the Tsogolo la Thanzi project (2009–2012) in Malawi, this study employed logistic regression analysis to investigate the influence of young women’s emotions, expectations, and a standard measure of fertility preferences on pregnancy and modern contraceptive use.ResultsYoung women experienced high unmet need; across survey waves, over three-quarters of women who desired a child in more than 2 years were not currently using modern contraceptives and over three-quarters of women who thought a pregnancy in the next month would be bad news (garnered from a measure of emotions surrounding pregnancy) were not currently using modern contraceptives. In regression models including all three measures of fertility preferences, each was significantly associated with the likelihood of a future pregnancy. The standard measure and emotions measure were significantly associated with modern contraceptive use.DiscussionEmotions and expectations surrounding pregnancy and childbirth appear to be distinct and salient aspects of fertility preferences in addition to the standard measure. A better understanding of the multidimensional nature of fertility preferences will help individuals define and achieve their reproductive goals and obtain appropriate services. Furthermore, future research should incorporate new measures of fertility preferences into surveys internationally.

Assisted reproduction using donor gametes is a procedure that allows those who are unable to produce their own gametes to achieve gestational parenthood. Where conception is achieved using donor sperm, the child lacks a genetic link to the intended father. Where it is achieved using a donor egg, the child lacks a genetic link to the intended mother. To address this lack of genetic kinship, some fertility clinics engage in the practice of matching the ethnicity of the gamete donor to that of the recipient parent. The intended result is for the child to have the phenotypic characteristics of the recipient parents. This paper examines the philosophical and ethical problems raised by the policy of ethnic matching in gamete donation. I consider arguments for the provision of ethnic matching based on maximising physical resemblance and fostering ethnic identity development. I then consider an argument against ethnic matching based on the charge of racialism. I conclude that while the practice of ethnic matching in gamete donation could promote positive ethnic identity development in donor-conceived children from historically subjugated ethnic minorities, it also risks endorsing the problematic societal attitudes and assumptions regarding ethnicity that enabled such subjugation in the first place.

One of the important developments in assisted reproductive technology is the technique of oocyte preservation, which enables women to preserve their eggs when there is a threat of becoming infertile in the future. In spite of the still experimental status of this procedure, fertility clinics widely recommend it to healthy women who wish to postpone childbearing for social reasons. Since in fertility clinic's websites appear extensive recommendations and promotion about this technology, it seems important to analyze their online persuasive communication. Our analysis applies a mixed methodology of content and discourse analysis from a framing theory perspective. It provides an in-depth analysis of the content of fertility clinics' websites in Spain, describing their communication/information strategies regarding fertility preservation for social reasons. The present article confirms the inconsistency that exists in terms of the clarity of the information given by these websites, since the information is framed intending to attract more women to the egg freezing services.

[This corrects the article DOI: 10.1371/journal.pone.0240033.].[This corrects the article DOI: 10.1371/journal.pone.0240033.].

Recently, childfree people have been foregrounded in mainstream media. More than seven percent of Western women choose to remain childfree and this figure is increasing. Being childfree challenges the ‘procreation imperative’ residing at the center of our hetero-normative understandings, occupying an uneasy position in relation to—simultaneously—traditional academic ideologies and prevalent social norms. After all, as Adi Avivi recognizes, if a woman is not a mother, the patriarchal social order is in danger. This collection engages with these (mis)perceptions about childfree people: in media representations, demographics, historical documents, and both psychological and philosophical models. Foundational pieces from established experts on the childfree choice--Rhonny Dam, Laurie Lisle, Christopher Clausen, and Berenice Fisher--appear alongside both activist manifestos and original scholarly work, comprehensively brought together. Academics and activists in various disciplines and movements also riff on the childfree life: its implications, its challenges, its conversations, and its agency—all in relation to its inevitability in the 21st century. Childfree across the Disciplines unequivocally takes a stance supporting the subversive potential of the childfree choice, allowing readers to understand childfreedom as a sense of continuing potential in who—or what—a person can become.