title: Should diagnostic testicular sperm retrieval followed by cryopreservation for later ICSI be the procedure of choice for all patients with non-obstructive azoospermia?
abstract: BACKGROUND
  This was a retrospective study to determine if diagnostic testicular biopsy followed by cryopreservation should be the procedure of choice for all patients with testicular failure.
  
  
  METHODS
  The first part of the study analysed 97 ICSI cycles scheduled with frozen-thawed testicular sperm for 69 non-obstructive azoospermia (NOA) patients. The second part focused on a subgroup of 32 patients who underwent 42 ICSI cycles with frozen and 44 cycles with fresh testicular sperm. Sperm characteristics, fertilization, embryo quality, pregnancy and implantation rates were evaluated.
  
  
  RESULTS
  Part I: The average time needed to find sperm was 113 min per cycle and 17 min per individual sperm. Fertilization rate, embryo transfer rate, ongoing pregnancy and implantation rates were 58.4%, 83%, 20.8% and 11.3%, respectively. Part II: The search time per sperm was higher (P=0.016) in frozen (18 min) than in fresh suspensions (13 min). A higher embryo transfer rate was observed in fresh cycles than in frozen cycles (93.2% vs 76.2%, P=0.028). Fertilization, ongoing pregnancy and implantation rates were comparable for the two groups.
  
  
  CONCLUSIONS
  Even in a programme with low-restrictive criteria for patient allocation and for sperm cryopreservation, diagnostic testicular biopsy followed by cryopreservation can be the procedure of choice for patients with testicular failure.
authors.affiliation: Centre for Reproductive Medicine, University Hospital of the Dutch-speaking Brussels Free University, Laarbeeklaan 101, B-1090 Brussels, Belgium. greta.verheyen@az.vub.ac.be
authors.forename: G
authors.initials: G
authors.lastname: Verheyen
authors.forename: V
authors.initials: V
authors.lastname: Vernaeve
authors.forename: L
authors.initials: L
authors.lastname: Van Landuyt
authors.forename: H
authors.initials: H
authors.lastname: Tournaye
authors.forename: P
authors.initials: P
authors.lastname: Devroey
authors.forename: A
authors.initials: A
authors.lastname: Van Steirteghem
mesh_terms: D000328:Adult; D000368:Aged; D015925:Cryopreservation / Q000379:methods*; D010064:Embryo Implantation; D004624:Embryo Transfer; D005260:Female; D047109:Fetal Development; D006801:Humans; D008297:Male; D008875:Middle Aged; D009845:Oligospermia / Q000628:therapy*; D011247:Pregnancy; D018873:Pregnancy Rate; D012189:Retrospective Studies; D012662:Semen Preservation / Q000379:methods*; D020554:Sperm Injections, Intracytoplasmic / Q000379:methods*; D013094:Spermatozoa / Q000502:physiology*; D013737:Testis / Q000473:pathology*