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Grand RoundsWeekly Evidence Brief

Obstetrics & Gynecology

Edition

30-Second Takeaway

  • Natural or modified natural endometrial preparation increases live‑births after frozen embryo transfer.
  • Continuing GLP‑1 receptor agonists into the first trimester did not show definitive large harms but estimates were imprecise.

Week ending June 13, 2026

Grand Rounds: Selected recent evidence affecting reproductive‑age care and trial generalizability

GLP‑1 receptor agonist continuation into first trimester not clearly harmful, estimates imprecise

ANNALS OF INTERNAL MEDICINEJun 8, 2026

In a U.S. claims target‑trial emulation of 3,572 pregnancies with GLP‑1RA dispensed before LMP, continuation into the first trimester yielded a weighted nonlive birth risk of 29.7% versus 27.1% with noncontinuation (adjusted RR 1.09, 95% CI 0.98–1.23). Among 2,529 live births, continuation showed no definitive increases in SGA, LGA, or major congenital malformations, but confidence intervals were wide and compatible with clinically important differences. The study is applicable to patients exposed to GLP‑1RAs in early pregnancy but may have residual confounding by prior glycemic control.

Pivotal device trials report demographics but rarely embed equity analyses

JOURNAL OF CLINICAL EPIDEMIOLOGYJun 13, 2026

This scoping review of 74 pivotal device investigations found age and sex were almost always reported, but race/ethnicity appeared in only 35.1% of studies and other PROGRESS‑Plus variables in 9.5%. Few trials incorporated EDI framing in design or analysis (2.7%), and none used CONSORT‑Equity or population benchmarking to assess representativeness. For clinicians and regulators, limited equity integration constrains external validity of device evidence, especially for marginalized groups.

Vaginal estradiol with progesterone increases implantation and clinical pregnancy but not live birth

HUMAN REPRODUCTION OPENJun 10, 2026

In a single‑center RCT of 518 normal responders on GnRH antagonist IVF/ICSI, adding vaginal 17β‑estradiol to progesterone increased implantation and clinical pregnancy rates. Ongoing pregnancy and live birth did not differ significantly between estradiol plus progesterone versus progesterone alone. Intracytoplasmic pregnancy (ICP) risk was higher with estradiol, so benefits for early pregnancy markers did not translate into clear live‑birth advantage and warrant safety caution.

References

Numbered in order of appearance. Click any reference to view details.

Additional Reads

Optional additional studies from this edition.

Edition context

Clinical signal

  • Discuss uncertainty and residual confounding when counseling pregnant patients on GLP‑1 RA continuation.
  • Prefer natural/modified natural cycle preparation for FET when feasible and appropriate.
  • Interpret device and oncology trial results cautiously when demographics or sex representation are limited.