Transvaginal color Doppler offers a closer look at blood flow within the reproductive organs. Recent literature using this technique demonstrates that 1) blood flow in the uterine and ovarian arteries is related inversely to estrogen levels, 2) no significant difference is seen between right and left uterine arteries among fertile and infertile patients, and 3) high resistance in uterine and ovarian arteries is correlated directly with poor pregnancy outcome. The question remains: Is there an resistive index or pulsatility index value, representing a cut-off point, for predicting successful outcome in the patient undergoing in vitro fertilization?
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