Spectroscopy analysis of endometrial metabolites is a powerful predictor of success of embryo transfer in women with implantation failure: a preliminary study.

Objective: To investigate whether prior endometrium spectroscopy predicts the success of embryo transfer in patients with recurrent implantation failure (RIF).
Materials and Methods: Twenty women with RIF who were scheduled for IVF-ET and six fertile women were included the study. All women with RIF and fertile controls underwent endometrium spectroscopy before embryo transfer. A multi-voxel spectroscopy sequence was used for the detection of choline (Cho), creatine (Cr), lactate, and lipids. Women with RIF were divided into two subgroups as successful ( n  = 8) and unsuccessful RIF ( n  = 12) according to both Cho and Cr metabolite characteristics and whether pregnancy was achieved. Associations between the metabolite intensities of the RIF subjects and the implantation rate (IR) and clinical pregnancy rate (CPR) were assessed.
Results: While 8 of 20 RIF cases became pregnant, pregnancy could not be achieved in 12 cases. The common spectroscopy finding in all 8 cases who conceived was high Cho and low lactate. The main metabolite change detected in 12 patients who could not conceive was the increase in lactate and lipid signals. The cutoff value of Cho, Cr, lactate and lipid were 1.01 ppm, 1.44 ppm, 0.86 ppm and 1.22 ppm respectively in patients who achieved pregnancy following ET. A positive and significant correlation was found between Cho and Cr intensities and IR or CPR.
Conclusions: Receptive endometrium represents some specific metabolites in spectroscopy that can be used for prediction of the success or failure of embryo transfer in women suffering implantation failure.