Trocar-assisted selective laser photocoagulation of communicating vessels: A technique for the laser treatment of patients with twin-twin transfusion syndrome with inaccessible anterior placentas

Materials and methods. TA-SLPCV was performed through a single port in TTTS patients with an anterior placenta in whom the anastomoses were inaccessible with a standard technique (inaccessible anterior placentas). The anastomoses were first identified using a 25 or 70-degree rigid diagnostic endoscope. The anastomoses were then targeted with a zero-degree operating rigid endoscope by withdrawing it within the sheath a short distance and using the sheath to gently indent the placenta (trocar assistance). The technique was compared with patients with a posterior placenta treated with a standard technique. Surgeries were approved by the Institutional Review Boards and all patients signed informed consent. Results. Of 267 patients who met the criteria for the study, 143 (53.6%) had an anterior placenta and 124 (46.4%) had a posterior placenta. Perinatal survival (88.1% vs. 91.9%, p = 0.3), residual patent anastomoses (4.3% vs. 2.7%, p = 0.6), or premature rupture of membranes within 3 weeks of the procedure (7.7% vs. 4%, p = 0.2), was no different relative to placental location (anterior vs. posterior, respectively). Operating time was significantly different between the groups (median 46 min vs. 36 min, p < 0.05). Conclusion. Trocar assistance allows treatment of TTTS patients with inaccessible anterior placentas using a single port and a rigid endoscope with similar results as patients with a posterior placenta and a standard technique.