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Rose B.I.,Infertility Solutions | Rose B.I.,Bethlehem University
Journal of Assisted Reproduction and Genetics | Year: 2014

Purpose: To evaluate the minutiae associated with oocyte retrieval for use in human in vitro maturation IVF cycles. Many of the relevant features of oocyte retrieval were identified by the Trounson group in the first publication on successful in vitro maturation using transvaginal oocyte harvesting and these were a major focus of this review.Methods: Published human and animal studies, together with topics from mathematics and mechanics, were used to try to understand the importance of different choices that could be made in structuring a transvaginal oocyte retrieval procedure in humans.Results: The published literature suggests that the highest oocyte recovery rate occurs using higher pressures and thicker needles, but this comes at the cost of damaging the cumulus oocyte complex. It is likely that this damage is caused by the sheer stress forces exerted on the cumulus oocyte complex due to parabolic forces associated with laminar flow within the needle and is likely worsened by irregular forces during intervals of turbulent flow occurring with entry into the needle. Larger needles also cause more pain and may be associated with more blood loss. Higher velocity entry into the follicle, needle rotation to prevent premature blockage of the lumen, and carefully timed applications of aspiration pressure theoretically optimize oocyte retrieval technique.Conclusions: Oocyte retrieval for in vitro maturation is effected by the interaction of the many choices that need to be made in planning for the procedure. The most difficult decision involves aspiration pressure or fluid flow rate and needle size. © 2014, Springer Science+Business Media New York. Source

Rose B.I.,Infertility Solutions | Rose B.I.,Bethlehem University | Laky D.,Infertility Solutions
Journal of Assisted Reproduction and Genetics | Year: 2013

Purpose: The significance of finding a fragmented first polar body in an oocyte prepared for ICSI is controversial with most recent publications suggesting that it is not prognostic for oocyte fertilization or embryo development. Our purpose was to look at this question in the context of oocytes not stimulated for conventional IVF. Methods: Oocytes obtained for IVM and obtained from follicles at most 12 mm in diameter were evaluated for their polar body morphology soon after they entered metaphase II when they were denuded in preparation for ICSI. Records were evaluated retrospectively for the fertilization rate and the embryo growth rate (cell number) on each day of development for embryos with normal appearing polar bodies or fragmented polar bodies, but no other cytoplasmic dysmorphisms. Results: Oocytes with fragmented polar bodies were significantly less likely to fertilize than oocytes with normal appearing polar bodies (p < 0.0001). Embryos which developed from oocytes with fragmented polar bodies had significantly impaired growth compared to embryos that developed from oocytes with normal appearing polar bodies (p = 0.0328). Conclusions: Fragmented polar bodies likely reflect cytoplasmic incompetence. © 2013 Springer Science+Business Media New York. Source

Rose B.I.,Infertility Solutions | Rose B.I.,Bethlehem University | Laky D.,Infertility Solutions
Journal of Assisted Reproduction and Genetics | Year: 2013

Purpose: This study compared the impact of using the Steiner-Tan pseudo double lumen needle for antral follicle oocyte retrieval to using a conventional non-flushing needle. The Steiner-Tan needle has a much smaller dead space than the needles commonly used for IVM oocyte retrievals. Methods: This was a retrospective cohort study. The patient population was determined by the time period in which a patient underwent IVM in a single physician's IVF practice. The following data was abstracted from clinical and embryology records: oocytes retrieved, oocytes matured, early maturing oocytes, oocytes fertilized, embryo quality measures, retrieval time, needle punctures, clot formation, and clinical pregnancy rate. Results: The Steiner-Tan needle did not increase the number of oocytes retrieved. It also did not increase the time required for retrieval. However, flushing of antral follicles significantly decreased clot formation in fluid aspirates. Use of the Steiner-Tan needle also significantly decreased the number of vaginal needle punctures during each case. There was a trend toward improved embryo quality, but statistical power was inadequate to show a difference. Conclusions: The primary benefit of the Steiner-Tan needle was on the embryological aspects of IVM. Decreased blood and blood clots in the aspirates made an IVM retrieval more like conventional IVF for the embryologist. The patient also experienced less tissue trauma without increasing anesthesia or surgical time. There was no improvement in the number of oocytes retrieved, but based on the results, we hypothesized that oocytes were more commonly retrieved from slightly large follicles than when using a routine needle. © 2013 Springer Science+Business Media New York. Source

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