What are safe treatments for angioedema during pregnancy?

Question

Hi doctor,

My 31-year-old sister has hereditary angioedema and recently found out that she is 12 weeks pregnant with her first child. She has been using Icatibant injections to manage acute attacks, but her allergist has advised that Icatibant is not recommended during pregnancy.

Last week, she experienced a severe episode involving facial swelling and difficulty swallowing that lasted for approximately eight hours. We were close to taking her to the emergency room. Her recent lab results show that her C1 esterase inhibitor levels are extremely low, only 15% of normal, and her attacks are becoming more frequent. She is very anxious, particularly about the possibility of experiencing a serious attack during labor and delivery, which could compromise her ability to breathe. Her obstetrician-gynecologist is not very familiar with hereditary angioedema and has referred her to a high-risk pregnancy specialist.

Stress seems to be a major trigger for her attacks, and her anxiety about the pregnancy is only exacerbating the condition. She is also worried about the genetic inheritance of the condition and whether her baby might be affected, as this condition runs in our family. Is there a safe and effective treatment option for hereditary angioedema during pregnancy? What precautions can be taken to ensure both her and the baby’s safety during pregnancy and delivery?

Please help me.

Thanks.

Answer 1

Hi,

Welcome to icliniq.com.

I can understand your concern.

I can understand how frightening this situation must be for your sister and for you as well. Her concerns are absolutely valid, and it is critical that she is seen by a high-risk pregnancy specialist (a maternal-fetal medicine doctor) as soon as possible. This specialist can work closely with her allergist to develop a comprehensive care plan.

Acute attack management:

The safest and most effective treatment for acute hereditary angioedema (HAE) attacks during pregnancy is plasma-derived C1 esterase inhibitor concentrate (e.g., Berinert). It works by directly replacing the deficient protein her body lacks.

If C1 esterase inhibitor concentrate is not readily available, fresh frozen plasma (FFP) may be used as an alternative, although it is generally considered a second-line option.

Prophylactic (preventive) treatment

To reduce the frequency and severity of attacks, especially as delivery approaches, regular prophylactic infusions of C1 esterase inhibitor (weekly or biweekly) are often started during pregnancy. This approach is safe and commonly used.

Androgens such as Danazol and Stanozolol should be avoided during pregnancy, as they are unsafe for the fetus. In contrast, C1 inhibitor replacement therapy is well-tolerated and safe throughout pregnancy.

Delivery considerations are as follows:

Your sister should plan to deliver at a hospital that has experience managing hereditary angioedema, ideally with access to on-site C1 inhibitor therapy and emergency airway management if needed. Prophylactic C1 esterase inhibitor is usually administered before or during labor to prevent a crisis. Because stress is a known trigger, emotional support, counseling, or involvement in a support group can be very beneficial in reducing anxiety and improving overall well-being during pregnancy.

Genetic risks are as follows:

Hereditary angioedema is an autosomal dominant condition, so there is a 50% chance the baby may inherit it. Genetic counseling and prenatal testing are available if she wishes to explore those options further, though testing is typically done later in pregnancy or after birth.

I hope this answer helps you.

Please let me know if I can assist you further, and feel free to stay in touch for any future updates.

Thank you.