Zona pellucida removal and vitrified blastocyst transfer outcome: a preliminary study

Hiraoka, Kenichiro; Fuchiwaki, Megumi; Hiraoka, Kaori; Horiuchi, Toshitaka; Murakami, Tomoyo; Kinutani, Masayuki; Kinutani, Kazuo
July 2007
Reproductive BioMedicine Online (Reproductive Healthcare Limited;Jul2007, Vol. 15 Issue 1, p68
Academic Journal
The objective of this study was to investigate whether a change in assisted hatching technique from partial opening to total removal of the zona pellucida improved the outcome of vitrified blastocyst transfer. This was a preliminary observational study conducted from November 2003 to April 2006. Partial opening using acid Tyrode's solution was performed in 45 cycles, while total removal using a laser and mechanical pipetting was performed in 57 cycles. The clinical pregnancy, implantation, and delivery rates were higher in the total removal group than in the partial opening group (67% versus 42%, P < 0,02: 55% versus 30%, P < 0.01; 56% versus 36%, P < 0.04, respectively). These results suggest that total removal of the zona pellucida is associated with higher pregnancy, implantation and delivery rates compared with partial opening for vitrified blastocyst transfer.


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