Publications by authors named "Oosterhuis G"

Study Question: Is a strategy starting with transvaginal hydrolaparoscopy (THL) cost-effective compared to a strategy starting with hysterosalpingography (HSG) in the work-up for subfertility?

Summary Answer: A strategy starting with THL is cost-effective compared to a strategy starting with HSG in the work-up for subfertile women.

What Is Known Already: Tubal pathology is a common cause of subfertility and tubal patency testing is one of the cornerstones of the fertility work-up. Both THL and HSG are safe procedures and can be used as a first-line tubal patency test.

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Previous research has shown that personal, neighborhood, and mobility characteristics could influence life satisfaction and loneliness of people and that exposure to public spaces, such as green spaces, may also affect the extent to which people feel lonely or satisfied with life. However, previous studies mainly focused on one of these effects, resulting in a lack of knowledge about the simultaneous effects of these characteristics on loneliness and life satisfaction. This study therefore aims to gain insights into how public-space use mediates the relations between personal, neighborhood, and mobility characteristics on the one hand and loneliness and life satisfaction on the other hand.

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Objective: To assess the capacity of transvaginal hydrolaparoscopy (THL) versus hysterosalpingography (HSG) as a primary tool to diagnose tubal pathology.

Study Design: We performed a multicenter RCT (NTR3462) in 4 teaching hospitals in the Netherlands, comparing THL and HSG as first line tubal test in subfertile women. The primary outcome of the trial was cumulative live birth rate at 24 months.

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Background: The prevalence of obesity, an important cardiometabolic risk factor, is rising in women. Lifestyle improvements are the first step in treatment of obesity, but the success depends on factors like timing and motivation. Women are especially receptive to advice about lifestyle before and during pregnancy.

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Study Question: Does a reduced FSH dose in women with a predicted hyper response, apparent from a high antral follicle count (AFC), who are scheduled for IVF/ICSI lead to a different outcome with respect to cumulative live birth rate and safety?

Summary Answer: Although in women with a predicted hyper response (AFC > 15) undergoing IVF/ICSI a reduced FSH dose (100 IU per day) results in similar cumulative live birth rates and a lower occurrence of any grade of ovarian hyperstimulation syndrome (OHSS) as compared to a standard dose (150 IU/day), a higher first cycle cancellation rate and similar severe OHSS rate were observed.

What Is Known Already: Excessive ovarian response to controlled ovarian stimulation (COS) for IVF/ICSI may result in increased rates of cycle cancellation, the occurrence of OHSS and suboptimal live birth rates. In women scheduled for IVF/ICSI, an ovarian reserve test (ORT) can be used to predict response to COS.

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Study Question: Are there treatment selection markers that could aid in identifying couples, with unexplained or mild male subfertility, who would have better chances of a healthy child with IVF with single embryo transfer (IVF-SET) than with IUI with ovarian stimulation (IUI-OS)?

Summary Answer: We did not find any treatment selection markers that were associated with better chances of a healthy child with IVF-SET instead of IUI-OS in couples with unexplained or mild male subfertility.

What Is Known Already: A recent trial, comparing IVF-SET to IUI-OS, found no evidence of a difference between live birth rates and multiple pregnancy rates. It was suggested that IUI-OS should remain the first-line treatment instead of IVF-SET in couples with unexplained or mild male subfertility and female age between 18 and 38 years.

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Study Question: Do age, ovulatory status, severity of obesity and body fat distribution affect the effectiveness of lifestyle intervention in obese infertile women?

Summary Answer: We did not identify a subgroup in which lifestyle intervention increased the healthy live birth rate however it did increase the natural conception rate in anovulatory obese infertile women.

What Is Known Already: Obese women are at increased risk of infertility and are less likely to conceive after infertility treatment. We previously demonstrated that a 6-month lifestyle intervention preceding infertility treatment did not increase the rate of healthy live births (vaginal live birth of a healthy singleton at term) within 24 months of follow-up as compared to prompt infertility treatment in obese infertile women.

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Background And Objective: Subfertility represents a multidimensional problem associated with significant distress and impaired social well-being. In the Netherlands, an estimated 50,000 couples visit their general practitioner and 30,000 couples seek medical specialist care for subfertility. We conducted an economic evaluation comparing recombinant human follicle-stimulating hormone (follitropin alfa, r-hFSH, Gonal-F) with two classes of urinary gonadotrophins-highly purified human menopausal gonadotrophin (hp-HMG, Menopur) and urinary follicle-stimulating hormone (uFSH, Fostimon)-for ovarian stimulation in women undergoing in vitro fertilization (IVF) treatment in the Netherlands.

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Study Question: What is the feasibility of performing transvaginal hydrolaparoscopy (THL) in an outpatient setting?

Summary Answer: It is feasible to perform THL in an outpatient setting, reflected by a low complication and failure rate and a high patients' satisfaction.

What Is Known Already: THL is a safe method to investigate tubal patency and exploring the pelvis in subfertile women.

Study Design, Size, Duration: Retrospective cohort study of 1127 subfertile women who underwent THL as primary diagnostic method for testing tubal patency in an outpatient setting.

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Background: Small lifestyle-intervention studies suggest that modest weight loss increases the chance of conception and may improve perinatal outcomes, but large randomized, controlled trials are lacking.

Methods: We randomly assigned infertile women with a body-mass index (the weight in kilograms divided by the square of the height in meters) of 29 or higher to a 6-month lifestyle intervention preceding treatment for infertility or to prompt treatment for infertility. The primary outcome was the vaginal birth of a healthy singleton at term within 24 months after randomization.

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Study Question: What is the cost-effectiveness of in vitro fertilization (IVF) with conventional ovarian stimulation, single embryo transfer (SET) and subsequent cryocycles or IVF in a modified natural cycle (MNC) compared with intrauterine insemination with controlled ovarian hyperstimulation (IUI-COH) as a first-line treatment in couples with unexplained subfertility and an unfavourable prognosis on natural conception?.

Summary Answer: Both IVF strategies are significantly more expensive when compared with IUI-COH, without being significantly more effective. In the comparison between IVF-MNC and IUI-COH, the latter is the dominant strategy.

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Objectives: To compare the effectiveness of in vitro fertilisation with single embryo transfer or in vitro fertilisation in a modified natural cycle with that of intrauterine insemination with controlled ovarian hyperstimulation in terms of a healthy child.

Design: Multicentre, open label, three arm, parallel group, randomised controlled non-inferiority trial.

Setting: 17 centres in the Netherlands.

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Objective: To assess the impact of elevated early follicular progesterone (P) levels in gonadotropin-releasing hormone (GnRH) antagonist cycles on clinical outcome using prospective data in combination with a systematic review and meta-analysis.

Design: Nested study within a multicenter randomized controlled trial and a systematic review and meta-analysis.

Setting: Reproductive medicine center in an university hospital.

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Objective: To assess long-term effects of laparoscopic electrocautery of the ovaries compared with ovulation induction with gonadotropins in women with clomiphene citrate (CC)-resistant polycystic ovary syndrome (PCOS) on the incidence of pregnancy complications like gestational diabetes, hypertensive disorders, and metabolic or cardiovascular disease.

Design: Long-term follow-up study.

Setting: Twenty-eight hospitals within the Netherlands.

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Study Question: What is the impact of initiating GnRH antagonist co-treatment for in vitro fertilization (IVF) on cycle day (CD) 2 compared with CD 6 on live birth rate (LBR) per started cycle and on the cumulative live birth rate (CLBR)?

Summary Answer: Early initiation of GnRH antagonist does not appear to improve clinical outcomes of IVF compared with midfollicular initiation.

What Is Known Already: During ovarian stimulation for IVF, GnRH antagonist co-treatment is usually administered from the midfollicular phase onwards. Earlier initiation may improve the follicular phase hormonal milieu and therefore overall clinical outcomes.

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Objective: To summarize the evidence for the use of commonly accepted fertility tests in subfertile women with ovulation problems.

Design: Systematic review.

Setting: Not applicable.

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The gold standard of semen analysis is still an manual method, which is time-consuming, labour intensive and needs thorough quality control. Microfluidics can also offer advantages for this application. Therefore a first step in the development of a microfluidic chip has been made, which enables the man the semen analysis at home.

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Background: Laparoscopic electrocautery of the ovaries and ovulation induction with gonadotrophins are both second line treatments for women with clomiphene citrate-resistant polycystic ovary syndrome (PCOS). Long-term follow-up after electrocautery versus ovulation induction with gonadotrophins has demonstrated at least comparable chances for a first live born child with a reduced need for ovulation induction or assisted reproduction treatment and increased chances for a second live born child. In this study, we report on the long-term economic consequences of both treatment modalities.

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Background: In the Netherlands, 30% of subfertile women are overweight or obese, and at present there is no agreement on fertility care for them. Data from observational and small intervention studies suggest that reduction of weight will increase the chances of conception, decrease pregnancy complications and improve perinatal outcome, but this has not been confirmed in randomised controlled trials. This study will assess the cost and effects of a six-months structured lifestyle program aiming at weight reduction followed by conventional fertility care (intervention group) as compared to conventional fertility care only (control group) in overweight and obese subfertile women.

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Background: Obesity is increasing rapidly among women all over the world. Obesity is a known risk factor for subfertility due to anovulation, but it is unknown whether obesity also affects spontaneous pregnancy chances in subfertile, ovulatory women.

Methods: We evaluated whether obesity affected the chance of a spontaneous pregnancy in a prospectively assembled cohort of 3029 consecutive subfertile couples.

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In a 34-year-old woman with uterine fibroids, one of the fibroids was calcified and was therefore visible on a conventional radiograph.

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A 32-year-old woman with oligomenorrhoea/amenorrhoea and a 30-year-old woman with oligomenorrhoea as a result of the polycystic ovary syndrome (PCOS), with an active desire for children, were considered eligible for in-vitro fertilisation (IVF) because the semen of their partners was of inferior quality. However, the patients' polycystic ovaries proved to be difficult to stimulate. There was either no response to stimulation with gonadotropins or an excessive response, as a result of which treatment had to be stopped prematurely.

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After the introduction of assays determining apoptosis in human ejaculated spermatozoa, several studies have been published about the relationship between apoptosis in spermatozoa and semen quality. Apoptosis in spermatozoa is significantly correlated with conventional semen quality parameters, but also with the outcome of assisted reproductive techniques. The apoptotic process is probably set in motion before ejaculation.

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Background: A method was previously described to measure FSH reliably in unextracted urine. The aim of the current study was to establish the course of FSH measured in urine throughout the cycle.

Method: Daily urinary FSH (uFSH) concentrations were determined in 14 regularly menstruating volunteers aged 23-39 years during one complete menstrual cycle.

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