Epididymal microsurgery: current techniques and new horizons

Area of Science:

• Reproductive Medicine
• Surgical Urology
• Andrology

Background:

• Obstructive azoospermia treatment has evolved from vasoepididymal fistula techniques to microvasoepididymal bypass procedures.
• Current microvasoepididymostomy (micro-VE) techniques aim for improved success rates in restoring patency and sperm production.

Purpose of the Study:

• To describe a modified end-to-end microanastomosis technique for obstructive azoospermia using animal models.
• To evaluate the efficacy of this technique and an epididymal microaspiration procedure for assisted reproduction.

Main Methods:

• Development and application of a modified end-to-end microanastomosis attaching the vas deferens to the ductus epididymidis.
• Description of an epididymal microaspiration procedure for sperm retrieval in cases unsuitable for micro-VE.
• Modeling of novel procedures like microepididymoepididymostomy and vas bridge bypass in rabbits.

Main Results:

• The modified micro-VE technique resulted in less scarring and easier surgical access, with 60% of patients producing spermatozoa.
• Pregnancies were achieved in 10% of 102 patients undergoing the modified micro-VE procedure.
• Epididymal microaspiration yielded an 18% fertilization and 3% pregnancy rate per cycle, with potential for improvement.

Conclusions:

• The modified microvasoepididymostomy offers improved outcomes and surgical manageability for obstructive azoospermia.
• Epididymal microaspiration is a viable option for severe infertility, with ongoing research to enhance its success rates.
• Emerging microsurgical techniques show promise for future treatment of complex obstructive azoospermia cases.