Ectopic pregnancy risk factors for ART patients undergoing the GnRH antagonist protocol: a retrospective study.

Endometrial thickness was numerically lower in the ectopic pregnancy group but this did not reach statistical significance ( P = 0.0965) Recently, Rombauts et al. found that a combined endometrial thickness under 9 mm engenders a 4-fold risk of ectopic pregnancy compared with an endometrial thickness over 12 mm [ 37 ], which he attributes to the directionality of uterine peristalsis waves.

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