Prognostic Factors for adverse outcome

Prognostic Factors for adverse outcome

Absent or reversed end-diastolic flow in the donor umbilical artery, abnormal pulsatility of the venous system in the recipient, and absence of an arterioarterial anastomosis are predictive of fetal mortality. Preoperative absent or reversed end-diastolic velocity in the umbilical Doppler, but not other Doppler studies, may predict demise in the donor twin following laser therapy. 

Short cervical length, parity, and intrauterine demise of one twin have been shown to be predictors of preterm delivery in pregnancies identified with TTTS following laser coagulation of vascular anastomoses.