Abstract
Hereditary angioedema (HAE) is an autosomal dominant disease mostly due to the deficiency of C1 inhibitor (C1-INH). HAE with normal C1-INH was first described in 2000 and associated with mutations in the coagulation factor XII in 2006. Both diseases are associated with high bradykinin production, resulting in increased vascular permeability. Gastrointestinal edema due to HAE can be misdiagnosed as acute abdomen and unnecessary surgical procedures may be performed. The present study evaluates the prevalence of surgical procedures and/or acute abdomen in HAE patients with the coagulation factor XII mutation. It is a retrospective study where patients were diagnosed with recurrent angioedema without urticaria, normal C1-INH levels, and positive family history of angioedema. All patients were evaluated for the known mutations located at exon 9 of the F12 gene. Medical records were evaluated and questionnaires were applied to 52 patients with normal C1-INH levels (age range 13–76 years; 47/52, 90.38% women; 5/52, 9.61% men). F12 mutation was present in 32/52 patients (61.5%). Acute abdominal pain was diagnosed in 16/52 (30.76%) patients, appendicitis in 9/16 (56.2%), and undetermined diagnosis in 7/16 (43.7%). Among patients diagnosed with acute abdominal pain, 13/16 (81.2%) underwent surgery and 3/16 (18.7%) improved without surgical intervention. We conclude that many HAE patients with coagulation factor XII mutation were misdiagnosed with acute abdomen and subjected to unnecessary invasive procedures. It is critical to disseminate information about this rare mutation in patients with otherwise normal C1-INH activity, in order to speed up diagnosis and avoid misconduct.
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Abbreviations
- HAE:
-
hereditary angioedema
- C1-INH:
-
C1 inhibitor
- C1-INH-HAE:
-
HAE with C1-INH defect
- nC1-INH-HAE:
-
HAE with normal C1-INH;
- U-HAE:
-
HAE with unknown mutation
- FXII-HAE:
-
HAE with F12 gene mutation
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Funding
MG-received a grant from National Council for Scientific and Technological Development (CNPq) (113924/2019-4); ASG: awarded productivity grant from National Council for Scientific and Technological Development (CNPq) (308556/2018-6). CLV: received grants from CNPq (407714/2018-9) and FAPESP (2015/25494-1).
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Conception: MG, CV, ASG. Acquisition of data: all authors. Analysis of data: MG, CV, ASG. Approved the manuscript: all authors.
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The protocol was approved by the ethical committee of Centro Universitario Saude ABC (CAAE 36889514.8.0000.0082).
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Gutierrez, M., Veronez, C.L., Rodrigues Valle, S.O. et al. Unnecessary Abdominal Surgeries in Attacks of Hereditary Angioedema with Normal C1 Inhibitor. Clinic Rev Allerg Immunol 61, 60–65 (2021). https://doi.org/10.1007/s12016-021-08852-7
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DOI: https://doi.org/10.1007/s12016-021-08852-7