title: Ultrasound-guided embryo transfer improves pregnancy rates and increases the frequency of easy transfers.
abstract: BACKGROUND
  Recent reports have suggested that ultrasound (US) guidance during embryo transfer might improve pregnancy rates.
  
  
  METHODS
  A prospective randomized (computer-generated random table) trial was performed to compare embryo transfer under abdominal US guidance (n = 255 women) with clinical touch embryo transfer (n = 260).
  
  
  RESULTS
  The clinical pregnancy rate was 26.3% (67/255) in the US-guided transfer group compared with 18.1% (47/260) in the clinical touch transfer group (P < 0.05). The implantation rate was 11.1% (100/903) in the US group compared with 7.5% (66/884) in the clinical touch group (P < 0.05). US-guided transfer was associated with a decrease in the difficulty of the transfers: 97% of transfers were easy in the US-guided group compared with 81% in the clinical touch group (P < 0.05).
  
  
  CONCLUSIONS
  US-guided embryo transfer increased pregnancy and implantation rates in IVF cycles, as well as the frequency of easy transfers. It is suggested that the decrease in cervical and uterine trauma can play a role in the increase in pregnancy rates associated with US-guided transfer. It is recommended that embryo transfer should be performed under US guidance.
authors.affiliation: Department of Obstetrics and Gynecology, Hospital of Cruces, País Vasco University, Baracaldo, Vizcaya, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Matorras
authors.forename: E
authors.initials: E
authors.lastname: Urquijo
authors.forename: R
authors.initials: R
authors.lastname: Mendoza
authors.forename: B
authors.initials: B
authors.lastname: Corcóstegui
authors.forename: A
authors.initials: A
authors.lastname: Expósito
authors.forename: F J
authors.initials: FJ
authors.lastname: Rodríguez-Escudero
mesh_terms: D000328:Adult; D010064:Embryo Implantation; D004624:Embryo Transfer; D005260:Female; D006801:Humans; D011247:Pregnancy; D018873:Pregnancy Rate; D011446:Prospective Studies; D014463:Ultrasonography