Embryo implantation rates in oocyte donation: a prospective comparison of tubal versus uterine transfers.
OBJECTIVE
To compare pregnancy and implantation rates in tubal and uterine transfers during a hormonal replacement cycle in an oocyte donation program.


METHODS
Prospective randomized.


METHODS
Forty-two consecutive patients who entered an oocyte donation program.


METHODS
Twenty-two patients were assigned for uterine transfer and 20 for tubal embryo transfer (ET).


RESULTS
Twenty-three pregnancies were achieved, 12 (54.5%) after uterine transfers and 11 (57.9%) after tubal transfers. Implantation rates in both groups are not significantly different (17.4% uterine transfers versus 21.5% tubal ETs).


CONCLUSIONS
Our results suggest that in hormonal replacement cycles (uniform endometrial stimulation) there is no advantage in transferring embryos to the fallopian tube. Furthermore, embryo quality and endometrial receptivity appear to be significantly more important than the time of entrance of an embryo to the uterine cavity in determining its chances of implantation.
Balmaceda
J P
JP
Division of Reproductive Endocrinology and Infertility, University of California, Irvine, Orange.
Alam
V
V
Roszjtein
D
D
Ord
T
T
Snell
K
K
Asch
R H
RH
D010064:Embryo Implantation; D004624:Embryo Transfer / Q000379:methods*; D005187:Fallopian Tubes; D005260:Female; D006801:Humans; D009865:Oocytes; D011247:Pregnancy; D011446:Prospective Studies; D014019:Tissue Donors; D014599:Uterus