In a prospective study, 15 patients with normal menstrual cycles were treated with pulsatile gonadotrophin-releasing hormone (GnRH) for one to four cycles. These cycles were compared to unstimulated cycles of 14 volunteers. There was a surprisingly stable number of large (greater than or equal to 14 mm diameter) follicles per patient. The number of large follicles in induction cycles was significantly greater than in controls (2.4 versus 1.07). This was due to significantly higher follicle stimulating hormone levels during the first days of treatment. Our data provide a rationale for the use of pulsatile GnRH for a safe and mild form of stimulation in assisted reproductive therapies.
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