Assessment of endometrial receptivity by transvaginal color Doppler and three‐dimensional power Doppler ultrasonography in patients undergoing in vitro fertilization procedures.

The objective of this study was to investigate the usefulness of transvaginal color Doppler and three‐dimensional power Doppler ultrasonography for the assessment of endometrial receptivity. A total of 89 patients undergoing in vitro fertilization procedures were evaluated for endometrial thickness and volume, endometrial morphology, and subendometrial perfusion on the day of embryo transfer. Neither the volume nor the thickness of the endometrium on the day of embryo transfer had a predictive value for conception during in vitro fertilization cycles (P > .05). Patients who became pregnant were characterized by a significantly lower resistance index, obtained from subendometrial vessels by transvaginal color Doppler ultrasonography (resistance index = 0.53 +/‐ 0.04 versus 0.64 +/‐ 0.04, pregnant versus not pregnant, respectively; P < .05), and a significantly higher flow index (13.2 +/‐ 2.2 versus 11.9 +/‐ 2.4; P < .05), as measured by a three‐dimensional power Doppler histogram. No difference was found in the predictive value of scoring systems analyzing endometrial thickness and volume, endometrial morphology, and subendometrial perfusion by color Doppler and three‐dimensional power Doppler ultrasonography. The high degree of endometrial perfusion shown by color Doppler ultrasonography and on three‐dimensional power Doppler histograms on the day of embryo transfer can indicate a more favorable endometrial milieu for successful in vitro fertilization.

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