Complex endometrial wave-patterns in IVF.

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.

Design: Descriptive study.

Setting: University hospital-based fertility clinic.

Patient(s): Twenty-four patients undergoing IVF.

Intervention(s): Ultrasound examination was performed on the day of hCG administration.

Main Outcome Measure(s): Endometrial wave type and intraobserver and interobserver agreement.

Result(s): 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.

Conclusion(s): 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.