title: Selective fetoscopic laser photocoagulation of superficial placental anastomoses for the treatment of severe twin-twin transfusion syndrome.
abstract: OBJECTIVE
  To report our initial institutional experience with fetoscopic laser photocoagulation of placental anastomoses in severe twin-twin transfusion syndrome using a 1.0 mm endoscope.
  
  
  METHODS
  Between July 2006 and June 2008, 19 monochorionic diamniotic twin pregnancies complicated by severe TTTS (Quintero stages III and IV) underwent fetoscopic laser therapy. Perinatal data were prospectively collected and compared according to the Quintero stages.
  
  
  RESULTS
  Nine patients were classified as stage III and ten as stage IV. The Mean gestational ages at diagnosis and procedure were 20 (range: 17-25) and 22.0 (range: 19.0-26.0) weeks, respectively, with no statistical difference between the two groups. Preterm premature rupture of the membranes occurred in two cases (10.5%), and spontaneous preterm delivery in eight (42.1%). Overall mean gestational age at delivery was 32.1 (range: 26.0-38.0) weeks. Prematurity was more severe in stage IV patients (p<0.01). Among all cases, the overall survival rate was 52.6%, and the percentages of pregnancies with survival of both babies and at least one twin were 26.3% and 78.9%, respectively. In the case of stage III patients, the overall survival rate was 61.1%. Of the stage III pregnancies, 33.3% resulted in both babies surviving, and 88.9% of these pregnancies resulted in at least one surviving twin. For stage IV, as the corresponding statistics were 45.0%, 20.0% and 70.0% respectively.
  
  
  CONCLUSIONS
  Our initial institutional experience with 1.0 mm fetoscopic laser therapy for severe TTTS showed results similar to those reported in the literature for larger endoscopes.
authors.affiliation: Obstetrics Department, Universidade de São Paulo, Faculdade de Medicina da Universidade de São Paulo/SP, Brazil . rodrigoruano@hotmail.com
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Ruano
authors.forename: Maria de Lourdes
authors.initials: Mde L
authors.lastname: Brizot
authors.forename: Adolfo Wenjaw
authors.initials: AW
authors.lastname: Liao
authors.forename: Marcelo
authors.initials: M
authors.lastname: Zugaib
mesh_terms: D005260:Female; D005330:Fetofetal Transfusion / Q000000981:diagnostic imaging / Q000601:surgery*; D005332:Fetoscopy / Q000379:methods*; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D053685:Laser Therapy / Q000379:methods*; D008028:Light Coagulation / Q000379:methods*; D008297:Male; D011247:Pregnancy; D011256:Pregnancy Outcome; D047928:Premature Birth; D011446:Prospective Studies; D012720:Severity of Illness Index; D015996:Survival Rate; D014430:Twins, Monozygotic; D014463:Ultrasonography