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All obstetrics & gynaecology briefings

The edition · Obstetrics & Gynaecology

Hip extension at crowning did not protect the perineum in a 1,206-woman trial

A pragmatic trial found no difference in significant tears when women lowered their legs at crowning. Also: a UK national cohort of pregnancy with cardiomyopathy, a post hoc look at DHA dose by genotype, an extended truncal block for caesarean pain, and a sharp rise in US hypertensive disorders.

The edition in brief

In a pragmatic randomised trial of 1,206 nulliparous women delivering vaginally at term, directing hip extension at crowning did not reduce second- to fourth-degree tears on intention to treat (66.6% vs 66.2%). As-treated differences in anal sphincter injury did not survive adjustment, and a quarter of the intervention group did not adhere. A UK Obstetric Surveillance System cohort of 210 pregnancies in women with pre-existing cardiomyopathy recorded no maternal deaths, median delivery at 38.1 weeks, heart failure in 10% and arrhythmia in 8%, with one in five babies admitted to the neonatal unit. A post hoc ADORE analysis suggests the FADS Indel genotype may predict who gains from 1,000 mg/day DHA: early preterm birth was 1.1% with high dose versus 4.3% with low dose in I-allele carriers, but numbers were small. A single-centre Chinese trial of 150 women found an ilioinguinal-transversus abdominis plane block with liposomal bupivacaine cut 24-hour sufentanil use by 37% against a standard TAP block. US vital statistics show age-standardised hypertensive disorders of pregnancy rose 74% between 2016 and 2024. The pearl: postpartum blood pressure often peaks days after birth, so follow-up after pre-eclampsia cannot stop at discharge.

In this edition
01
Clinical update

Pregnancy with known cardiomyopathy: a national UK picture

Counsel women with known cardiomyopathy that most pregnancies go well under planned joint care, but heart failure affected one in ten.

2 min · BJOG : an international journal of obstetrics and gynaecologyRead →
Primary outcome
Obstetric, neonatal and cardiovascular outcomes
Effect
No maternal deaths; heart failure 10%, arrhythmia 8%; median delivery 38.1 weeks; 20% neonatal unit admission
02Research

Liposomal bupivacaine I-TAP block reduced opioid use after caesarean

Consider the I-TAP approach a promising refinement of truncal blocks after caesarean, pending replication.

2 min · Drug design, development and therapyRead →
03Research

DHA dose and preterm birth may depend on a single genotype

Treat genotype-guided DHA dosing as a hypothesis worth a trial, not a practice.

2 min · PLoS medicineRead →
04Research

US hypertensive disorders of pregnancy rose 74% in nine years

Expect more hypertensive pregnancies, and build postpartum and long-term cardiovascular follow-up into routine care.

1 min · Obstetrics and gynecologyRead →
05Pearl

Postpartum blood pressure often peaks after discharge

Follow up blood pressure in the first postpartum week after any hypertensive pregnancy, not just at discharge.

1 minRead →
06
Practice changer

Directing hip extension at crowning did not reduce tears

Do not direct women to extend their hips at crowning to protect the perineum — the trial showed no benefit on intention to treat.

2 min · Obstetrics and gynecologyRead →
Primary outcome
Second- to fourth-degree perineal laceration
Effect
66.6% intervention vs 66.2% usual care (P=0.89)

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