Measurements of a nonlinear refractive index with a single laser pulse.

Ovarian Hyperstimulation syndrome (OHSS) is a rare condition in patients with hypogonadotropic hypogonadism. Two patients with hypogonadotropic hypogonadism are reported, a rare case of severe OHSS and a case of prevented OHSS via gonadotropin-releasing hormone (GnRH) agonist trigger, respectively. The first case was a 31-year-old patient. In vitro fertilization (IVF) treatment was performed three times but the patient never developed OHSS. The first patient was diagnosed as having severe OHSS on the ninth day after the fresh embryo transfer. She stayed 66 days in hospital and 50.5 litres of fluid were aspirated from her abdomen. The second case was a 26-year-old and primary infertile patient. She had never undergone IVF treatment. The GnRH agonist stimulation test was performed before IVF treatment. After the ovarian stimulation, GnRH agonist trigger was given. Thirty-two oocytes were retrieved from the ovaries and OHSS did not occur. Although severe OHSS is rare, it can develop in patients hypogonadotropic hypogonadism. If a GnRH stimulation test is performed before ovarian stimulation, OHSS can be prevented because the test allows agonist triggering instead of hCG in hypogonadotropic hypogonadism.