Sperm cryopreservation protocol for micro-TESE-retrieved sperm.

Area of Science:

• Reproductive Medicine
• Andrology
• Sperm Biology

Background:

• Azoospermia, the absence of sperm in ejaculate, is classified into obstructive (OA) and nonobstructive (NOA) types.
• Testicular Sperm Extraction (TESE) is the primary method for sperm retrieval in men with NOA.
• Sperm obtained through microdissection-TESE are rare, necessitating effective preservation for assisted reproductive technology (ART).

Purpose of the Study:

• To review the physiological and molecular aspects of sperm cryopreservation.
• To examine current methods and devices for preserving small numbers of sperm obtained via TESE.
• To compare the efficacy of fresh versus cryopreserved testicular sperm for ART.

Main Methods:

• Review of conventional freezing and vitrification techniques for sperm cryopreservation.
• Evaluation of the strengths and limitations of each preservation method.
• Comparative analysis of fresh and cryopreserved testicular sperm outcomes.

Main Results:

• Cryopreservation is essential for managing rare sperm retrieved through microdissection-TESE.
• Both freezing and vitrification have distinct advantages and disadvantages for preserving testicular sperm.
• Understanding sperm physiology and molecular changes during cryopreservation is key to optimizing protocols.

Conclusions:

• Effective cryopreservation of microdissection-TESE sperm is vital for men with NOA, reducing the need for repeat surgeries.
• Vitrification and conventional freezing offer different approaches to preserving rare testicular sperm, each with specific applications.
• Comparing fresh and cryopreserved sperm is crucial for maximizing ART success rates in NOA patients.