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Table 2 Clinical outcome of ICSI using frozen-thawed oocytes in comparison with fresh oocytes in previous ICSI cycles in patients with severe azoospermia or oligoasthenoteratozoospermia

From: Slow oocyte freezing and thawing in couples with no sperm or an insufficient number of sperm on the day of in vitrofertilization

  ICSI in patients with severe azoospermia or oligoasthenoteratozoospermia
  Fresh oocytes Frozen-thawed oocytes
Patients 13 13
ICSI cycles 22 14
Injected oocytes 171 111
Fertilized oocytes 85 (50.0%) 51 (67.1%)
Non-cleaved or triploid zygotes 10 (11.8%)* 17 (33.3%)*
Embryos 78 34
Blastocysts 20 8
Blastocyst rate 25.6% 23.5%
Embryo transfers (ET) 18 7
Pregnancies 3 2
Clinical pregnancy rate per ET 17.0% 28.6%
Clinical pregnancy rate per cycle 13.6% 14.2%
Birth of a child 3 2
  1. *Statistically significant difference as evaluated by the Chi-Square test at P < 0.01.