RESUMO
An experimental study was carried out in order to evaluate the effect to of pentoxifylline on the membrane function of washing and swim-up sperm in the process of sperm preparation for assisted reproductive techniques. Normal semen samples were taken according to World Health Organization criterias, from 30 male partners who attended the infertility clinic from November 1996 to January 1997, and divided into two aliquots. In the process of sperm preparation by the washing and swim-up method, pentoxifylline was added in only one aliquot. The hypo-osmotic swelling test was used to evaluate the outcome of both aliquots. From the study, the percentage of sperm that showed swollen tails in the hypo-osmotic solution prepared by the washing and swim-up method and treated by pentoxifylline was higher than that in the group which did not have pentoxifylline added in the process of sperm preparation. However, the difference was not atatistically significant (54.9 and 49.2 percent; P>0.01). It was therefore concluded that pentoxifylline added to washing and swim-up sperm in the process of sperm preparation dose not improve membrane function of spermatozoa. Thus, it may not be necessary to use pentoxifylline in the treatment of male infertility.