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Updated: Jun 10, 2026

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Published on: April 4, 2013
[IMSI: indications, results and reflexions]
1IVF Centers Prof. Zech, Bregenz, Autriche.
Summary
Nuclear vacuoles in sperm reduce pregnancy success. Intracytoplasmic morphologically selected sperm injection (IMSI) improves pregnancy rates compared to standard ICSI, but its precise use remains debated.
Area of Science:
- Reproductive Medicine
- Human Embryology
- Sperm Morphology
Background:
- Nuclear vacuoles in human sperm are linked to decreased pregnancy rates.
- Standard Intracytoplasmic Sperm Injection (ICSI) may be less effective when sperm vacuoles are present.
Purpose of the Study:
- To evaluate the efficacy of Intracytoplasmic Morphologically Selected Sperm Injection (IMSI) in improving pregnancy rates.
- To clarify the indications for using IMSI in assisted reproductive technologies.
Main Methods:
- Utilizing Motile Sperm Organised Morphologically under real-time fine morphology assessment (MSOME).
- Comparing pregnancy rates between IMSI and conventional ICSI procedures.
Main Results:
- IMSI demonstrated an increased pregnancy rate compared to standard ICSI.
- The study highlights the positive impact of IMSI on fertility outcomes.
Conclusions:
- IMSI is a potentially superior technique for patients with specific sperm morphology issues.
- Further research is needed to define the exact indications and optimize the application of IMSI in clinical practice.