Sperm-preparation techniques for men with normal and abnormal semen analysis. A comparison.

Area of Science:

• Reproductive Medicine
• Sperm Biology
• Andrology

Background:

• Sperm preparation techniques are crucial for assisted reproductive technologies.
• Assessing sperm quality involves evaluating acrosome reaction (AR), hypoosmotic swelling (HOS), and nuclear maturity.
• Men with abnormal semen analyses often require optimized sperm preparation.

Purpose of the Study:

• To compare density gradient centrifugation and swim-up for sperm preparation.
• To evaluate the impact of these techniques on AR, HOS, and nuclear maturity.
• To differentiate outcomes in men with abnormal versus normal semen analyses.

Main Methods:

• Prospective, controlled study of 43 men (23 abnormal, 20 normal semen analyses).
• Semen samples assessed for AR, HOS, and nuclear maturity (acridine orange staining) pre- and post-processing.
• Comparison of density gradient centrifugation and swim-up techniques.

Main Results:

• Men with abnormal semen analyses had lower baseline AR, HOS, and nuclear maturity.
• Density gradient centrifugation significantly improved AR, HOS, and nuclear maturity in men with abnormal analyses.
• In men with normal analyses, density gradient centrifugation improved AR, while swim-up was sufficient for nuclear maturity selection.
• Sperm motility and morphology correlated with nuclear maturity in abnormal semen samples.

Conclusions:

• Density gradient centrifugation is the preferred method for improving sperm parameters in men with abnormal semen analyses.
• Swim-up technique is adequate for selecting spermatozoa based on nuclear maturity in men with normal semen analyses.
• Sperm motility and morphology are indicators of nuclear maturity, particularly in abnormal semen samples.