ABSTRACT
Hereditary angioedema (HAE) is a rare genetic condition associated with episodic swelling due to dysfunction of bradykinin regulation pathways. This is most frequently caused by low level and/or function of the C1-esterase inhibitor protein (C1INH) which is known as hereditary angioedema with C1 inhibitor deficiency (C1INH-HAE). Pregnancy and labour can precipitate an attack, but the majority of women have an uncomplicated, spontaneous vaginal delivery. Intravenous C1INH is the first-line therapy in pregnancy and breastfeeding. It should be given if any obstetric intervention is planned. Routine prophylactic administration for uncomplicated vaginal birth is not mandatory but may be appropriate if symptoms recur frequently during the third trimester. Pregnant women with C1INH-HAE should deliver in a hospital with C1INH replacement, fiberoptic intubation and front-of-neck access equipment readily available. A documented treatment plan should be developed within a multi-disciplinary team to pre-empt complications. We describe a case of C1INH-HAE diagnosed in pregnancy.