Impact of elective frozen vs. fresh embryo transfer strategies on cumulative live birth: Do deleterious effects still exist in normal & hyper responders?

Fazilet Kubra Boynukalin, Niyazi Emre Turgut, Meral Gultomruk, Selen Ecemis, Zalihe Yarkiner, Necati Findikli and Mustafa Bahceci

PLOS ONE, 2020, vol. 15, issue 6, 1-15

Abstract: Background: Is freeze-all strategy effective in terms of cumulative live birth rates (CLBRs) in all patients? Methods: This retrospective single-center study analyzed the CLBRs of 2523 patients undergoing fresh or electively frozen blastocyst transfer cycles. In 1047, cycles, the fresh embryo transfer (ET) strategy was applied for the 1st ET, whereas electively frozen ET (e-FET) was performed in 1476 cycles. Female age ≤ 37 and blastocysts frozen via vitrification were included. The patients in each arm were further stratified into four subgroups according to the number of oocytes retrieved as follows: Group A: 1–5, group B: 6–10, group C: 11–15 and group D: 16–25 oocytes retrieved. The primary endpoint was the CLBR. The secondary endpoints were the ovarian hyperstimulation syndrome (OHSS) rate and the live birth rates (LBRs) following fresh ETs and e-FETs for the first transfers. Result(s): The CLBR was similar between the fresh ET and e-FET arms in group A (35/76 (46.1%) vs 29/67 (43.3%), p = 0.74) and group B (165/275 (60%) vs 216/324 (66.7%), p = 0.091), whereas significantly higher rates were detected in favor of the e-FET arm within group C (328/460 (71.3%) vs 201/348 (57.8%), p 10 oocytes retrieved during stimulated cycles.

Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0234481

DOI: 10.1371/journal.pone.0234481

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