Ejaculate oxidative stress is related with sperm DNA fragmentation and round cells.

Oxidative stress (OS) plays an essential role in male infertility aetiology by affecting sperm quality, function, and also the integrity of sperm DNA. The assessment of oxidative stress in semen may be an important tool to improve the evaluation of sperm reproductive capacity. The purpose of this study was the evaluation of any possible relation between the unbalance of oxidative stress caused by superoxide anion in the ejaculate with the presence of sperm DNA fragmentation and high concentration of round cells.

Comparative analysis of fetal and neonatal outcomes of pregnancies from fresh and cryopreserved/thawed oocytes in the same group of patients.

Objective: To analyze the fetal and neonatal outcomes of pregnancies achieved with fresh and/or frozen oocytes in the same group of patients.

Design: Observational study and comparative analysis.

Setting: Research unit of an academic medical center.

Experimental contamination assessment of a novel closed ultravitrification device.

Objective: To evaluate the safety of a new ultravitrification closed device.

Design: Ultravitrification research.

Setting: Private assisted reproduction center.