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[Abdominal manifestations in hereditary acute angioneurotic oedema. Value of study of the complement system (author's
Insights
Hereditary angioneurotic oedema (HAE) can cause severe abdominal pain mimicking surgical emergencies. Diagnosing HAE involves complement studies, with C1 esterase inhibitor functional activity being definitive.
Area of Science:
- Immunology
- Genetics
- Gastroenterology
Background:
- Hereditary angioneurotic oedema (HAE) is a rare genetic disorder.
- It is characterized by recurrent episodes of severe swelling (angioedema).
- Functional deficiency of C1 esterase inhibitor (C1-INH) is the underlying cause.
Observation:
- Four family members presented with HAE.
- Three experienced recurrent, severe abdominal pain and swelling.
- These symptoms mimicked acute surgical conditions, leading to potential misdiagnosis.
Findings:
- Complement studies, including total complement and fractions, aid in probable diagnosis during acute episodes.
- Dynamic complement studies between attacks are also informative.
- Definitive diagnosis requires measuring the functional activity of C1 esterase inhibitor.
Implications:
- Recognizing HAE's clinical and biological features can prevent unnecessary surgical interventions.
- Patients require medical management with surgical vigilance due to potential co-existing surgical lesions.
- Prompt recognition is crucial as angioedema can affect the airway, necessitating emergency procedures like intubation or tracheotomy.
Abstract:
Four individuals of the same family suffered from a functional deficiency in C1 esterase inhibitor. In three of them, the manifestations of hereditary angioneurotic oedema were abdominal, paroxystic and pseudo-surgical. They were related to the development of visceral or mucosal oedema. The measurement of total complement (and of its fractions) during the acute episode, as well as dynamic complement studies between attacks, represent a simple method for indicating the probable diagnosis. Only estimation of the functional activity of C1 esterase inhibitor provides definite evidence. Familiarity with the clinical and biological characteristics of these acute abdominal episodes makes it possible to avoid repeated, unnecessary operations in these patients. They should be treated medically, under surgical surveillance, since a patient with angioneurotic oedema may have nevertheless a specific lesion, in addition. In addition, the episode may spread at any time, resulting in oedema of the glottis requiring tracheotomy or immediate intubation.