title: Two methods of achieving pregnancies despite subnormal hypo-osmotic swelling test scores.
abstract: OBJECTIVE
  To determine whether either the use of intracytoplasmic sperm injection (ICSI) or chymotrypsin-galactose pretreatment of sperm before IUI can improve pregnancy results in female partners of men with sperm with subnormal hypo-osmotic swelling test scores.
  
  
  METHODS
  Randomized controlled study.
  
  
  METHODS
  University-based private practice of an infertility center and IVF center.
  
  
  METHODS
  Couples with infertility who presented during a specific time interval and in whom the male partner had a hypo-osmotic swelling score of < 50% in two consecutive cycles.
  
  
  METHODS
  Controls were treated by conventional IUI. Members of the treatment group were given an option of treatment of sperm with chymotrypsin-galactose before undergoing IUI or of undergoing IVF-ET with ICSI.
  
  
  METHODS
  Pregnancy rate (PR) per patient and per cycle.
  
  
  RESULTS
  None of the 14 control patients conceived despite 38 IUI cycles, whereas conception occurred for 4 (50%) of 8 couples in whom sperm was pretreated with chymotrypsin-galactose and for 2 (50%) of 4 couples who underwent ICSI. Patients who had enzymatic sperm treatment underwent 12 IUI cycles and 4 ICSI cycles; the PR per cycle was 33.3% in the former and 50% in the latter.
  
  
  CONCLUSIONS
  These data suggest that treating sperm with chymotrypsin-galactose before IUI or injecting only one sperm into the oocyte overcomes to some degree the block to successful pregnancy seen in women whose male partners have subnormal hypo-osmotic swelling tests.
authors.affiliation: Department of Obstetrics and Gynecology, Cooper Hospital/University Medical Center, University of Medicine and Dentistry of New Jersey (UMDNJ)-Robert Wood Johnson Medical School at Camden, USA.
authors.forename: D
authors.initials: D
authors.lastname: Katsoff
authors.forename: J H
authors.initials: JH
authors.lastname: Check
mesh_terms: D002918:Chymotrypsin / Q000494:pharmacology; D005260:Female; D005690:Galactose / Q000494:pharmacology; D006801:Humans; D007248:Infertility, Male / Q000628:therapy*; D007267:Injections; D007317:Insemination, Artificial, Homologous; D008297:Male; D009997:Osmotic Pressure; D011247:Pregnancy; D013094:Spermatozoa / Q000502:physiology*
chemical_list: D002918:Chymotrypsin; D005690:Galactose