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Gallardo M, Hebles M, Migueles B, Dorado M, Aguilera L, González M, Piqueras P, Montero L, Sánchez-Martín P, Sánchez-Martín F, Risco R. Thermal and clinical performance of a closed device designed for human oocyte vitrification based on the optimization of the warming rate. Cryobiology 2016; 73:40-6. [PMID: 27312427 DOI: 10.1016/j.cryobiol.2016.06.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 06/09/2016] [Accepted: 06/11/2016] [Indexed: 11/27/2022]
Abstract
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. The vitrification carrier consists of a main straw in which a specifically designed capillary is mounted and where the oocytes are loaded by aspiration. It can be hermetically sealed before immersion in liquid nitrogen for vitrification, and it is warmed in a sterile water bath at 37 °C. Measured warming rates achieved with this design were of 600.000 ºC/min for a standard DMEM solution and 200.000 ºC/min with the vitrification solution for human oocytes. A cohort of 143 donor MII sibling human oocytes was split into two groups: control (fresh) and vitrified with SafeSpeed device. Similar results were found in both groups: survival (97.1%), fertilization after ICSI (74.7% in control vs. 77.3% in vitrified) and good quality embryos at day three (54.3% in control vs. 58.1% in vitrified) were settled as performance indicators. The pregnancy rate was 3/6 (50%) for the control, 2/3 (66%) for vitrified and 4/5 (80%) for mixed transfers.
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Affiliation(s)
- Miguel Gallardo
- University of Seville, C/ Camino de los Descubrimientos s/n, 41092, Seville, Spain; Ginemed Clínicas, C/ Farmacéutico Murillo Herrera nº 3-5, 41010, Seville, Spain
| | - María Hebles
- Ginemed Clínicas, C/ Farmacéutico Murillo Herrera nº 3-5, 41010, Seville, Spain
| | - Beatriz Migueles
- Ginemed Clínicas, C/ Farmacéutico Murillo Herrera nº 3-5, 41010, Seville, Spain
| | - Mónica Dorado
- Ginemed Clínicas, C/ Farmacéutico Murillo Herrera nº 3-5, 41010, Seville, Spain
| | - Laura Aguilera
- Ginemed Clínicas, C/ Farmacéutico Murillo Herrera nº 3-5, 41010, Seville, Spain
| | - Mercedes González
- Ginemed Clínicas, C/ Farmacéutico Murillo Herrera nº 3-5, 41010, Seville, Spain
| | - Paloma Piqueras
- Ginemed Clínicas, C/ Farmacéutico Murillo Herrera nº 3-5, 41010, Seville, Spain
| | - Lorena Montero
- Ginemed Clínicas, C/ Farmacéutico Murillo Herrera nº 3-5, 41010, Seville, Spain
| | | | | | - Ramón Risco
- University of Seville, C/ Camino de los Descubrimientos s/n, 41092, Seville, Spain; National Accelerator Centre, C/ Thomas Alva Edison 7, 41092, Seville, Spain.
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