Association between oocyte donors' or recipients' body mass index and clinical outcomes after first single blastocyst transfers-the uterus is the most affected.

Objective: To assess whether high body mass index (BMI) in either oocyte donors or recipients is associated with poorer outcomes after the first single blastocyst transfer.

Design: Retrospective study including 1,394 first blastocyst single embryo transfers (SETs) conducted by 1,394 recipients during oocyte donation cycles with the gametes retrieved from 1,394 women (January 2019-July 2021). Four BMI clusters were defined for both donors and recipients (underweight: <18.

Live birth after replacement of an embryo obtained from a spontaneously in vitro matured metaphase-I oocyte.

This case report describes a live birth after the fresh replacement of an embryo obtained from a spontaneously in vitro matured oocyte. The patient was subjected to controlled ovarian stimulation for IVF treatment, obtaining two oocytes. One was found to be immature at the time of denudation, at metaphase-I.

Hydroxypropyl cellulose supplementation in vitrification solutions: a prospective study with donor oocytes.

Purpose: Hydroxypropyl cellulose (HPC), a polysaccharide that forms a viscous gel under low temperatures, is a promising substitute of the blood-derived macromolecules traditionally used in cryopreservation solutions. The performance of a protein-free, fully synthetic set of vitrification and warming solutions was assessed in a matched pair analysis with donor oocytes.

Methods: A prospective study including 219 donor MII oocytes was carried out, comparing the laboratory outcomes of oocytes vitrified with HPC-based solutions and their fresh counterparts.

Thermal and clinical performance of a closed device designed for human oocyte vitrification based on the optimization of the warming rate.

Although it was qualitatively pointed out by Fahy et al. (1984), the key role of the warming rates in non-equillibrium vitrification has only recently been quantitatively established for murine oocytes by Mazur and Seki (2011). In this work we study the performance of a closed vitrification device designed under the new paradigm, for the vitrification of human oocytes.

Seminal quality in the first fraction of ejaculate.

Semen samples from 40 patients were collected in consecutive fractions. The variability in semen quality of each fraction was then determined. The first ejaculated fraction (FEF) primarily contained prostatic secretions, while the second ejaculate fraction (SEF) held the majority of the spermatozoa suspended in the secretions from the seminal vesicle.