title: Enzymatic digestion plus mechanical searching improves testicular sperm retrieval in non-obstructive azoospermia cases.
abstract: BACKGROUND
  In non-obstructive azoospermic patients (NOA) besides the mechanical treatment, vital spermatozoa from the tissue obtained from testes by biopsy can be enzymatically prepared.
  
  
  OBJECTIVE
  To increase the sperm recovery success of testicular sperm extraction (TESE), suitable for ICSI.
  
  
  METHODS
  Prospective, clinical study. In 177 consecutive men who presented with clinical and laboratory data indicating NOA, tissue samples were obtained by microdissection TESE method. Initially, mature spermatozoa were searched for by mechanical extraction technique shredding the biopsy fractions. In cases with no spermatozoa was observed after maximum 30 min of initial searching under the inverted microscope, the procedure was then followed by enzymatic digestion using DNAse and collagenase type IV. In cases of at least a mature spermatozoon could be obtained properly, ICSI was performed.
  
  
  RESULTS
  Of 177 cases with NOA, conventional mincing method extended with enzymatic treatment yielded successful sperm recovery for ICSI in 102 (57%). Overall in vitro tissue-processing time for patients with sperm recovery failure after 30 min of mechanical searching, was between 80 and 105 min (mean 96+/-9). Cleavage, embryo transfer and clinical pregnancy rates in mechanical plus enzymatic TESE patients were not significantly different from those of only mechanically TESE performed patients (p>0.05).
  
  
  CONCLUSIONS
  Combination of conventional TESE and enzymatic digestion is an effective method to recover spermatozoa suitable for ICSI. The benefit of the mincing combined with enzyme to sperm retrieval for NOA is firstly to shorten the mechanical searching time, thus minimizing further cellular damage as well as exposure to external conditions, and secondly to reduce the number of cases with sperm recovery failures.
authors.affiliation: Research Center on Infertility, School of Medicine, University of Ankara, Ankara, Turkey. ksaydos@superonline.com
authors.forename: Kaan
authors.initials: K
authors.lastname: Aydos
authors.forename: L Cem
authors.initials: LC
authors.lastname: Demirel
authors.forename: Volkan
authors.initials: V
authors.lastname: Baltaci
authors.forename: Cihat
authors.initials: C
authors.lastname: Unlü
mesh_terms: D000328:Adult; D001706:Biopsy; D017364:Collagenases / Q000378:metabolism*; D003851:Deoxyribonucleases / Q000378:metabolism*; D004624:Embryo Transfer; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009845:Oligospermia / Q000628:therapy*; D011247:Pregnancy; D011446:Prospective Studies; D020554:Sperm Injections, Intracytoplasmic; D013094:Spermatozoa / Q000166:cytology*; D013737:Testis / Q000166:cytology*; D020858:Tissue and Organ Harvesting / Q000379:methods*
chemical_list: D003851:Deoxyribonucleases; D017364:Collagenases