OVARIAN STIMULATION IN ASSISTED REPRODUCTION

In assisted reproductive medicine the controlled ovarian hyperstimulat ion enables several oocytes to be collected with the following transfe r of more than one embryo and a higher pregnancy rate than in natural cycles. The most frequently used stimulation protocols are: i) clomiph ene citrate (CC) and hMG stimulation; ii) hMG/FSH stimulation; iii) Gn RH agonist (GnRH-a) and hMG/FSH stimulation, iiia) GnRH-a long protoco l, iiib) GnRH-a short protocol, GnRH-a ultrashort protocol, iv) GnRH a ntagonist and hMG stimulation. The protocols are described and the adv antages and disadvantages are discussed.