Benefit of Amlodipine in HRT Cycle for Frozen Embryo Transfer in the Correction of Uterine Pulsatility Index

Embryo implantation depends on two main factors: embryo grading quality and endometrial receptivity.Numerous tools have been suggested to evaluate these two factors. Measurement of the pulsatility index (PI) of the uterine arteries is associated with extremely low chances of pregnancy when it is high, especially higher than 3. A pilot study of women with premature ovarian failure with at least one of the uterine PIs greater than 3 showed the efficiency of nifedipine in uterine vascularization. This calcium channel blocker, used sublingually in this study, significantly lowered uterine PI in nearly half an hour. We are therefore interested in exploring this accessible, non-invasive and inexpensive tool, in the evaluation of endometrial receptivity before an embryo transfer.