Publications by authors named "Chjr Jansen"

Hypothermia is a relatively rare condition in pregnancy and has been associated with fetal bradycardia. The management of maternal hypothermia resulting in fetal bradycardia presents a challenging dilemma for healthcare professionals. Currently, no evidence exists to advise on the duration of this condition before obstetric interventions are necessary for a safe outcome for both mother and infant.

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Objectives: To assess the risk of intrauterine fetal death (IUFD) and fetal growth restriction (FGR) in fetuses with an isolated fetal intra-abdominal umbilical vein varix (i-FIUVV).

Methods: A retrospective cohort study combined with a systematic review and meta-analysis of the literature was performed. In the retrospective cohort study, all singleton fetuses with an i-FIUVV in the fetal medicine units of the Amsterdam UMC (between 2007 and 2023) were analyzed.

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Article Synopsis
  • The study aims to investigate the risk of preterm birth in women with placenta previa or low-lying placenta at various gestational ages and evaluate preventive interventions.
  • A comprehensive search identified 34 studies, revealing that women with placenta previa had higher rates of preterm birth compared to those with low-lying placentas; specific percentages of preterm births were reported for various gestational cut-offs.
  • Preventive measures like intramuscular progesterone and cerclage showed promise in prolonging pregnancies for women at risk, highlighting the importance of targeted interventions.
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Article Synopsis
  • The study aimed to investigate how oestrogen and oestrogen deprivation affect vaginal wound healing, particularly after prolapse surgery, which can impact future surgery success.
  • A systematic review identified 14 original studies, with 11 included in a meta-analysis, highlighting that oestrogen significantly improves various wound healing metrics in women and female animals.
  • The findings indicate that oestrogen therapy positively influences vaginal wound healing, suggesting potential benefits for surgical outcomes, and calls for more research in this area.
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Angiogenesis is required in cancer, including gynecological cancers, for the growth of primary tumors and secondary metastases. Development of anti-angiogenesis therapy in gynecological cancers and improvement of its efficacy have been a major focus of fundamental and clinical research. However, survival benefits of current anti-angiogenic agents, such as bevacizumab, in patients with gynecological cancer, are modest.

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Objective: The far majority of women with a placenta previa in the second trimester will no longer have a placenta that overlies the internal os in the third trimester. Women with a placenta previa in the third trimester are at risk for complication such as preterm birth and blood loss. Four counselling purposes we aim to identify which women with a second trimester placenta previa have a low-risk and a high-risk for persistence of the placenta previa.

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Low-lying placentas, placenta previa and abnormally invasive placentas are the most frequently occurring placental abnormalities in location and anatomy. These conditions can have serious consequences for mother and fetus mainly due to excessive blood loss before, during or after delivery. The incidence of such abnormalities is increasing, but treatment options and preventive strategies are limited.

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Objectives: The majority of cases of placenta previa or a low-lying placenta in the second trimester will have a normal placental position in the third trimester. The aim of this study was to assess the accuracy of the distance between the placenta and the internal os of the cervix (IOD) in the second trimester for the prediction of third-trimester low-positioned placenta, and to define a cut-off value at which all cases of third-trimester low-positioned placenta are identified.

Methods: This was a prospective cohort study including women undergoing a transvaginal ultrasound examination between 18 and 24 weeks' gestation who had a low-positioned placenta, defined as an IOD of < 20 mm.

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Low-positioned placentas which are located in the lower uterine segment (LUS), either a low-lying placenta or a placenta previa, are associated with increased obstetric risks. However, most second trimester low-positioned placentas resolve during pregnancy and have a higher position in the third trimester, without posing any risks. We performed a systematic review and meta-analysis to evaluate the proportion of second trimester low-positioned placentas that have a position towards the fundus in the third trimester.

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Objective: This study investigates whether noninvasive focal depth (FD) measurements correlate with vaginal wall epithelial thickness (ET). If FD accurately reflects ET of the vaginal wall, this would allow noninvasive longitudinal assessment of (newly developed) treatment modalities aiming to increase ET, without the need for invasive biopsies.

Methods: Fourteen women, median age 62 years (inter quartile ranges: 57-65), undergoing vaginal prolapse surgery because of anterior and/or posterior compartment pelvic organ prolapse were included.

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Background: Low-lying placentas are positioned close to the internal os of the cervix. The preferred way of delivery within this group is unclear.

Objectives: To review the literature on the success of a vaginal delivery with a low-lying placenta.

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Objective: To study whether the pregnancy outcome of intrauterine insemination (IUI) is affected by a longer time interval between semen processing and insemination.

Design: Retrospective cohort.

Setting: Teaching hospital.

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