Cryopreservation is a cornerstone of modern ART, allowing for the storage of oocytes and embryos for future use. Vitrification has largely replaced traditional slow-freezing techniques, offering significantly higher survival rates and better clinical outcomes.
The Science of Glass Transition
Vitrification involves ultra-rapid cooling (thousands of degrees per minute) combined with high concentrations of cryoprotectants. This rapid process prevents the formation of intracellular ice crystals, which are the primary cause of cellular damage during freezing. Instead, the liquid solidifies into a glass-like state.
Clinical Benefits
The implementation of vitrification has revolutionized fertility preservation, elective single embryo transfer (eSET) strategies, and donor egg programs. It offers patients greater flexibility and improved cumulative pregnancy rates.