Management of Women with Hereditary Angioedema During Pregnancy and Delivery
Åsa Aldergård, Ragnar Henningsson*
Department of Anesthesiology, Central Hospital of Karlstad, Sweden
*Corresponding author: Ragnar Henningsson, Department of Anesthesiology, Central Hospital of Karlstad, Sweden. Tel: +460708707524; Email: Ragnar.Henningsson@liv.se
Received Date: 04 April, 2018; Accepted Date: 25 April, 2018; Published Date: 03 May, 2018
Citation: Aldergård A, Henningsson R (2018) Management of Women with Hereditary Angioedema During Pregnancy and Delivery. J Anesth Surg Rep: JASR-103. DOI: 10.29011/ JASR-103. 100003
Hereditary Angioedema (HAE) is a rare but potentially life-threatening condition. The majority of patients with HAE experience a worsening of symptoms and attack-frequency during pregnancy. This case report describes a woman with insulin-treated gestational diabetes and HAE type 1 since many years, who was planned for cesarean section. This is to our knowledge, the first described case in elective spinal anesthesia.
2. Case Report
The patient herein gave her consent for inclusion in this report. We present a woman in 3rd trimester, with insulin-treated gestational diabetes and HAE type 1 since many years, who was planned for cesarean section at Karlstad Central Hospital. During the first half of pregnancy she suffered from several attacks, mostly with symptoms from abdomen, rectum and legs. She required medical treatment with human plasma-derived C1-INH concentrate 2-3 times a week. Second half of pregnancy was less severe, which she considered derived from less stress due to being on sick leave during this period.
Elective cesarean section was performed in week 38+5 due to breech presentation. She received 1500 E of pdh-C1INH one hour before start of surgery. The operation was performed in spinal anesthesia and went uneventful.
Our patient stayed a prolonged time in the recovery unit for extra surveillance. About an hour after the operation she experienced some hoarseness and a hint of swelling of her lips, but the symptoms declined spontaneously and needed no further treatment. She stayed at the hospital for three days without any further symptoms. The plan was not to breastfeed and she received karbegolin the first day post-partum.
Based on this case, a literature study of HAE and pregnancy was performed by searching PubMed of articles in English from 1999 to January 2017. 31 articles were found, 16 case-reports, 7 review-articles and 8 observational studies [3-33]. No randomized-controlled studies were found.
Hereditary Angioedema (HAE) is a rare but potentially life-threatening condition. It is an autosomal dominantly inherited disease with a quantitative decrease of C1-inhibitor (type 1) or normal levels of C1-inhibitor, but a functional defect (type 2). These conditions lead to an excessive production of bradykinin, which is a potent inducer of vasodilatation and vascular permeability. There is also a third type of hereditary angioedema (nC1-INH-HAE) with normal levels and function of C1-inhibitor, where an abnormality in Factor XII probably leads to inappropriate activation of the kinin forming cascade. Exacerbation from endogenous or exogenous estrogen exposure is particularly common in this form, but female sex hormones appears to play an important role in all HAE. The fourth form of HAE is of unknown origin. Mutations of the plasminogen gene and of the angiopoietin-1 gene (ANGPT1) are described in even two new types of hereditary angioedema [34,35].
Other trigging factors for HAE are mental stress or mechanical trauma, such as injury, surgical procedures or repetitive work . Pregnancy has multiple influences on the disease with both mechanical (due to the growing fetus) and hormonal effects and sometimes a mental stress. Apart from that there is a big variety of both severity of symptoms and attack frequency [4,6,7,20,21]. Pregnancy might be worsening the course of HAE, improve or not affect at all, but he majority of women experience an increase in attack rate during pregnancy [4,6,20].
In a retrospective study by Czaller  the symptoms and frequency of HAE was similar for each subsequent pregnancy in 78% of women, and the same conclusion was drawn by Bouilliet , but for some women the course of the disease differs a lot between pregnancies. In a case report by Montinaro  two homozygous twins with HAE are described with a very variable attack frequency during pregnancy. This report underlies that the clinical expression of the disease is variable during pregnancy in spite of an identical genetic background.
Localization of symptoms also seems to change during pregnancy. The abdominal region was the most common localization of oedema [6,20] and might be a differential diagnosis challenge. There are discrepancies whether in which trimester the symptoms are most severe [4,6,20,21]. The majority of drugs used for prophylaxis or treatment of HAE can´t be used during pregnancy and lactation, but human plasma-derived C1-INH (pdh-C1INH) concentrate has been used for several years and seems to be an effective and safe alternative, although controlled studies are lacking [3,4,6,7,11-13,16,20,23-29]. If this is not available tranexamic-acid or virally inactivated fresh frozen plasma can be considered [3,25,26,30].
Vaginal delivery is preferred to avoid provoking a life-threatening attack by endotracheal intubation or surgical injury. HAE attacks are uncommon during vaginal delivery although it involves substantial mechanical trauma [4,6,20-22]. pdh-C1INH prophylaxis can be considered, especially in instrumental deliveries or for patients with severe symptoms and should at least be immediately available in the delivery room [3,11]. Close follow-up for at least 72 hours after delivery is recommended and the patient should be informed of increased risk of post-partum swelling, when going home [3,5,11]. Regional anesthesia is strongly recommended for cesarean section since intubation can provoke a life-threatening laryngeal edema. pdh-C1INH-prophylax is recommended before start of surgery [3,5,11].
4. Funding: None
5. Conflict of Interest: None
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