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 increas
e in blood viscosity, changes in coagulation parameters as well as ren
al perfusion. Although the incidence of the severe forms of the syndro
me is very low, there is a general increase due to the wide spread use
of ovulation induction. The only treatment of the syndrome is prevent
ion by close monitoring of serum oestradiol levels and follicular deve
lopment.