Grave anaphylactic-like reaction in the course of menstruation. A case report.

The case of a woman with a serious anaphylactic pattern during menstruation is described. The patient had a clinical picture of urticaria, angioedema and shock at each menstruation for a period of 2 years until hysterectomy was performed. The studies showed no hormonal or immunological change. The only relevant finding was the extraordinarily strong vasodilating action of the menstrual fluid in the patient, and not in the controls. The results of the study suggest the possibility of two mechanisms: 1) an IgE-mediated mechanism causing hypersensitivity to some metabolic substance in the menstrual fluid and 2) an excessive pharmacological vasodilatory action produced by the prostacyclin in the fluid itself.