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Comparative Study
Journal Article
Overnight incubation improves selection of frozen-thawed blastocysts for transfer: preliminary study using supernumerary embryos.
Theriogenology 2003 November
A study was undertaken to determine whether the interval between thawing and transfer influences both biological and clinical outcomes of cryopreserved blastocysts, using supernumerary embryos cultured in sequential media. One hundred and seventy-two patients who underwent blastocyst thawing without any exclusion criteria were included in this single center prospective study of blastocyst thawing cycles. Outcome of 338 blastocysts originating from culture of supernumerary embryos in sequential media was analyzed after 4 or 20 h of culture between thawing and transfer. Survival rate, re-expansion and hatching rates for surviving blastocysts, implantation rates (IRs), pregnancy and miscarriage rates were studied. Blastocyst survival was not influenced by the incubation time after thawing; however both re-expansion and hatching rates were increased after 20-h incubation. Moreover, the IR per thawed or transferred blastocyst was increased three-fold after 20-h incubation compared to 4-h incubation. Increasing the interval between thawing and transfer appears to be beneficial in order to better select for transfer frozen-thawed blastocysts.
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