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Updated: May 14, 2026

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
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Polarization microscopy and rescue ICSI.

Giovanni Coticchio1

  • 1Biogenesi, Reproductive Medicine Centre, Istituti Clinici Zucchi, Via Zucchi 24, Monza, Italy. coticchio.biogenesi@grupposandonato.it

Reproductive Biomedicine Online
|January 29, 2013
PubMed
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Total fertilization failure in IVF cycles can be addressed by rescue intracytoplasmic sperm injection (ICSI). A new method using polarized light microscopy improves fertilization rates in failed cycles, though safety concerns persist.

Area of Science:

  • Reproductive Medicine
  • Embryology
  • Assisted Reproductive Technology

Background:

  • Total fertilization failure (TFF) affects a portion of standard in vitro fertilization (IVF) cycles.
  • Developing strategies to rescue failed IVF cycles can alleviate patient burden.

Purpose of the Study:

  • To refine the rescue intracytoplasmic sperm injection (ICSI) methodology for failed fertilized oocytes.
  • To assess the efficacy of a novel approach using polarized light microscopy in rescue ICSI.

Main Methods:

  • Rescue ICSI involves microinjection of oocytes that failed to fertilize by day 1 post-insemination.
  • Polarized light microscopy was employed to precisely identify oocytes not penetrated by spermatozoa.

Main Results:

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  • The perfected rescue ICSI methodology, utilizing polarized light microscopy, demonstrated a higher rate of normal fertilization in the study.
  • This technique targets only non-penetrated oocytes for microinjection.

Conclusions:

  • The refined rescue ICSI approach shows promise for improving fertilization success in previously failed IVF cycles.
  • Further investigation is warranted regarding the safety and efficacy of using in-vitro aged oocytes in rescue ICSI procedures.