Tip-microVapour Fast Freezing: A novel easy method for cryopreserving severe oligozoospermic samples

Area of Science:

• Reproductive Medicine
• Sperm Biology
• Cryopreservation Technology

Background:

• Sperm cryopreservation is crucial for men with low sperm counts, but conventional methods may be unsuitable.
• Severe oligozoospermia poses challenges for successful sperm banking.

Purpose of the Study:

• To evaluate the efficacy of tip-microVapour Fast Freezing for cryopreserving sperm from severe oligozoospermic subjects.
• To assess sperm motility, viability, and DNA fragmentation after cryopreservation using this novel technique.

Main Methods:

• Utilized tip-microVapour Fast Freezing with 10 μL tips and Test Yolk Buffer for cryopreservation.
• Compared tip-microVapour Fast Freezing with conventional 500 μL straw Vapour Fast Freezing in a subset of samples.
• Assessed sperm DNA fragmentation using the sperm chromatin dispersion test.

Main Results:

• Achieved median recovery rates of 0.29 for progressive motility, 0.30 for total motility, and 0.48 for viability.
• Tip-microVapour Fast Freezing demonstrated significantly higher sperm motility and viability compared to 500 μL straws (p < 0.001).
• The novel method resulted in lower sperm DNA fragmentation levels (33.00% vs. 36.00%, p < 0.001).

Conclusions:

• Tip-microVapour Fast Freezing is a highly promising method for cryopreserving semen samples from patients with severe oligozoospermia.
• This technique offers superior outcomes in sperm recovery and DNA integrity compared to conventional methods.
• Further research can validate its clinical application in assisted reproductive technologies.