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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.