Introduction
Materials and methods
Stimulation protocol for IVF
Vitrification methods
Slow-freezing method
Embryo survival assessment and handling
Statistics
Results
Vitrification Irvine | Vitrification Vitrolife | Slow-freezing | Total | |
---|---|---|---|---|
Cryopreserved embryos | 575 | 524 | 699 | 1798 |
Warmed embryos | 330 | 330 | 395 | 1055 |
Survived embryos (%) | 295/330 (89.4 %)a
| 289/330 (87.6 %)b
| 252/395 (63.8 %)a, b
| 836/1055 (79.2 %) |
Fully intact embryos (%) | 267/330 (80.1 %)a
| 251/330 (76.1 %)b
| 175/395 (44.3 %)a, b
| 693/1055 (65.7 %) |
Cleaved embryos (%) | 259/295 (87.8 %)a, c
| 235/289 (81.3 %)c, d
| 182/252 (72.2 %)a, d
| 676/836 (80.9 %) |
Transferred embryos (%) | 259/330 (78.5 %)a, c
| 235/330 (71.2 %)b, c
| 182/395 (46.1 %)a, b
| 676/1055 (64.1 %) |
IR/transferred embryo (%) | 41/259 (15.8 %) | 40/235 (17 %) | 39/182 (21.4 %) | 120/676 (17.7 %) |
IR/warmed embryo (%) | 41/330 (12.4 %) | 40/330 (12.1 %) | 39/395 (9.8 %) | 120/1055 (11.3 %) |
LB/transferred embryo (%) | 26/259 (10 %) | 25/235 (10.6 %) | 24/182 (13.2 %) | 75/676 (11.1 %) |
LB/warmed embryo (%) | 26/330 (7.8 %) | 25/330 (7.5 %) | 24/395 (6.1 %) | 75/1055 (7.1 %) |
Vitrification Irvine | Vitrification Vitrolife | Slow-freezing | |
---|---|---|---|
Initiated warming cycles | 255 | 261 | 260 |
Transfer rate per initiated warming cycle | 86.3 % a,c
| 77.4 % b,c
| 61.1 % a, b
|
Mean number of embryos transferred | 1.2 ± 0.4 | 1.2 ± 0.5 | 1.1 ± 0.4 |