The edition · Obstetrics & Gynaecology
Confirmed fetal parvovirus infection carries a 39% risk of intrauterine death
Pooled across 44 studies, the outcome depends entirely on whether infection is maternal or fetal — and the 2023-24 wave was no worse than earlier ones. Plus rising preterm prelabour rupture in France, a quarter of pregnancies anaemic in an insured US cohort, how closure technique may shape the caesarean scar, and what expert review does to a CIN2 diagnosis.
The edition in brief
A systematic review of 44 studies covering 3,221 women and 748 fetuses with parvovirus B19 infection found intrauterine demise in 38.7% of confirmed fetal infections but 7.3% of maternal infections, with intrauterine transfusion performed in 34.9% and 15.3% respectively. Hydrops was present in 58.7% of infected fetuses and abnormal neuroimaging in 28.6% of those who had fetal MRI. Outcomes in the 2023-24 outbreak did not differ significantly from earlier waves. A French national administrative study of 150,615 cases found preterm prelabour rupture of membranes rising by 2.3% a year from 2015 to 2023, from 2.2% to 2.7% of live births, with a dip in 2020 and marked geographical variation. In a US commercially insured cohort using trimester-specific haemoglobin standards, 25.6% of pregnancies met criteria for anaemia at some point, 4.3% in the first trimester and 24.5% by 22-30 weeks. A review of caesarean scar defects argues that hysterotomy placement and unlocked, interrupted or endometrium-free closure may reduce defect formation, while noting that the evidence is heterogeneous and that repair itself carries theoretical risk. In 437 Danish women under active surveillance for CIN2, expert review reclassified 40% of diagnoses, and subsequent CIN3 or worse ranged from 22.5% where experts downgraded to grade 1 or normal, to 64.3% where they upgraded to grade 3.
Parvovirus B19 in pregnancy: the number depends on who is infected
Quote 7.3% risk of intrauterine death for maternal parvovirus infection and 38.7% once fetal infection is confirmed, and consider fetal MRI in any fetus that has been transfused.
Preterm prelabour rupture is becoming commoner in France
Preterm prelabour rupture of membranes rose from 2.2% to 2.7% of French births over eight years with marked regional variation, which is a signal for local audit rather than a change in management.
A quarter of pregnancies anaemic — in an insured US population
Anaemia appeared in a quarter of pregnancies in a well-resourced insured cohort, almost all of it emerging after the booking screen — so act on the mid-pregnancy haemoglobin, not the first one.
The caesarean scar you leave behind
Closure technique at caesarean plausibly shapes the scar defect that causes later ectopic, accreta and bleeding, but the evidence is too heterogeneous to name a best method — record what you do so it can be studied.
Give the anti-D within 72 hours, and give it again after every sensitising event
Give anti-D within 72 hours of every sensitising event in an RhD-negative woman, and do not treat routine 28-week prophylaxis as cover for anything that happens afterwards.
Nearly half of CIN2 diagnoses change on expert review
Choose active surveillance for CIN2 on cytology grade and HPV genotype as well as histology, because expert review reclassifies about 40% of these diagnoses and misclassification explains much of the apparent progression.
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