Abstract
Increased contractility at the time of embryo transfer (ET) adversely affects embryo implantation and pregnancy rates in IVF (1). It has been postulated that the high uterine contraction frequency seen on the day of ET resulted from an insufficient response to the uterorelaxing properties of progesterone (2). Therefore, we decided to investigate the effectiveness of increasing luteal progesterone support based on endometrial contractility (EC) prior to programmed frozen embryo transfer (FET).
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