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Intracytoplasmic morphologically selected sperm injection: a prospective randomized trial.

Monica Antinori1, Emanuele Licata, Gianluca Dani

  • 1RAPRUI Day Hospital (International Associated Research Institute for Human Reproduction), Via Timavo 2, Rome, Italy. monica.antinori@raprui.com

Reproductive Biomedicine Online
|June 14, 2008
PubMed
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Intracytoplasmic morphologically selected sperm injection (IMSI) significantly improves pregnancy rates and reduces miscarriage in patients with severe male infertility compared to conventional intracytoplasmic sperm injection (ICSI). This advanced technique offers new hope for couples facing significant reproductive challenges.

Area of Science:

  • Reproductive Medicine
  • In Vitro Fertilization (IVF)
  • Andrology

Background:

  • Severe oligoasthenoteratozoospermia presents a significant challenge in infertility treatment.
  • Conventional intracytoplasmic sperm injection (ICSI) has limitations in cases of severe male factor infertility.

Purpose of the Study:

  • To evaluate the efficacy of intracytoplasmic morphologically selected sperm injection (IMSI) compared to conventional ICSI.
  • To assess pregnancy, miscarriage, and implantation rates in patients with severe male infertility undergoing IMSI versus ICSI.

Main Methods:

  • Prospective randomized study involving 446 couples with severe oligoasthenoteratozoospermia.
  • Patients were randomized to either ICSI (n=219) or IMSI (n=227).
  • IMSI involved selecting sperm based on high-magnification (x6600) organellar morphology.

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Main Results:

  • IMSI demonstrated a higher clinical pregnancy rate (39.2%) compared to ICSI (26.5%; P=0.004).
  • Patients with prior failed IVF attempts showed greater benefit from IMSI, with improved pregnancy (29.8% vs 12.9%) and reduced miscarriage rates (17.4% vs 37.5%).

Conclusions:

  • IMSI is a superior technique to ICSI for treating severe male infertility.
  • IMSI offers improved reproductive outcomes, particularly for patients with a history of failed treatments.