Polycystic ovary syndrome: induction of ovulation.

In summarizing the treatment of infertility associated with PCOS, basically the induction of ovulation may be achieved by boosting FSH stimulation of the ovaries, either indirectly with clomiphene or native pulsatile GnRH, or directly with gonadotrophin preparations. There seem to be two main determinants of the success of this treatment in achieving a live birth: the degree of hyperinsulinaemia and the concentration of circulating LH. Either of these, when in excess, not only makes induction of ovulation and conception relatively difficult but is also associated with a high rate of early miscarriage. Their correction, particularly in obstinate cases, should be a major consideration in the attempt to achieve optimal results. With such a range of reasonably successful treatments for the induction of ovulation in PCOS, the emphasis in the selection of therapy should now be placed on minimizing the prevalence of undesired side-effects while retaining acceptable efficiency.