[Ovarian hyperstimulation syndrome].

The ovarian hyperstimulation syndrome (OHSS) is caused iatrogenically by the application of agents for ovulation induction. The syndrome may be characterized by different symptoms sometimes including an increase in blood viscosity, changes in coagulation parameters as well as renal perfusion. Although the incidence of the severe forms of the syndrome is very low, there is a general increase due to the wide spread use of ovulation induction. The only treatment of the syndrome is prevention by close monitoring of serum oestradiol levels and follicular development.