title: Complex endometrial wave-patterns in IVF.
abstract: OBJECTIVE
  To reanalyze ultrasound images from IVF cycles with the aim of developing a refined endometrial wave classification system, which will allow description as well of the more complex endometrial wave patterns.
  
  
  METHODS
  Descriptive study.
  
  
  METHODS
  University hospital-based fertility clinic.
  
  
  METHODS
  Twenty-four patients undergoing IVF.
  
  
  METHODS
  Ultrasound examination was performed on the day of hCG administration.
  
  
  METHODS
  Endometrial wave type and intraobserver and interobserver agreement.
  
  
  RESULTS
  Two new wave types were added to the endometrial wave types that were described in the existing wave classification system: recoiling CF waves and a standing wave. Furthermore, an alternation between CF waves and FC waves in the same fragment was described. Calculation of interobserver and intraobserver agreement resulted in a kappa value reflecting strong agreement.
  
  
  CONCLUSIONS
  The refined endometrial wave classification system makes it possible to describe the more complex wave types that can be detected in IVF cycles on the day of hCG administration.
authors.affiliation: Department of Obstetrics and Gynaecology, Research Institute Grow, Academisch ziekenhuis Maastricht and Maastricht University, Maastricht, The Netherlands. irisvangestel@wanadoo.nl <irisvangestel@wanadoo.nl>
authors.forename: Iris
authors.initials: I
authors.lastname: van Gestel
authors.forename: Marga M
authors.initials: MM
authors.lastname: IJland
authors.forename: Johannes L H
authors.initials: JL
authors.lastname: Evers
authors.forename: Henk J
authors.initials: HJ
authors.lastname: Hoogland
mesh_terms: D002584:Cervix Uteri / Q000187:drug effects / Q000503:physiopathology; D006063:Chorionic Gonadotropin / Q000627:therapeutic use; D004717:Endometrium / Q000000981:diagnostic imaging* / Q000187:drug effects / Q000503:physiopathology; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D015588:Observer Variation; D014463:Ultrasonography
chemical_list: D006063:Chorionic Gonadotropin