Table 4. Our criteria for performing fetoscopic laser surgery.
| Criteria | Description | |
|---|---|---|
| Conventional criteria | 0. Twin-twin transfusion syndrome at 16–26 weeks | |
| • Oligohydramnios with an MVP ≤2.0 cm in the donor | ||
| • Polyhydramnios with an MVP ≥8.0 cm in the recipient | ||
| • Gestational age between 16.0 and 25.6 weeks | ||
| Non-conventional criteria | 1. Triplets | |
| • Dichorionic triamniotic triplets or monochorionic triamniotic triplets | ||
| • Feto-fetal transfusion syndrome (MVP ≤2.0 cm in the donor and ≥8.0 cm in the recipient) | ||
| • Gestational age between 16.0 and 25.6 weeks | ||
| 2. Twin-twin transfusion syndrome after 26 weeks | ||
| • Oligohydramnios with an MVP ≤2.0 cm in the donor | ||
| • Polyhydramnios with an MVP ≥10.0 cm in the recipient | ||
| • Gestational age between 26.0 and 27.6 weeks | ||
| 3. Selective intrauterine growth restriction with oligohydramnios | ||
| • Estimated fetal weight ≤−1.5 SD or intertwin estimated fetal weight discordance ≥25% | ||
| • Absent or reverse end-diastolic velocity in the umbilical artery in the smaller twin | ||
| • Oligohydramnios with an MVP ≤2.0 cm in the smaller twin | ||
| • Gestational age between 16.0 and 25.6 weeks | ||
MVP, maximum vertical pocket; SD, standard deviation.