Treatment for acute attack of Hereditary angioneurotic edema
**Core Concept**
Hereditary angioneurotic edema (HANE) is a rare genetic disorder characterized by recurrent episodes of severe edema, affecting various body parts. The underlying cause is a deficiency or dysfunction of **C1 esterase inhibitor**, a protein that regulates the **complement system** and **kinin system**.
**Why the Correct Answer is Right**
The correct treatment involves replacing or supporting the function of the deficient protein. Since the question is incomplete, a general approach to treating acute HANE attacks includes administering **C1 esterase inhibitor** concentrates, **icatibant** (a **bradykinin receptor antagonist**), or **ecallantide** (a **kallikrein inhibitor**).
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option provided, it's challenging to address directly, but any option not targeting the **C1 esterase inhibitor** pathway or **bradykinin** would be incorrect.
**Option B:** Similarly, without specifics, any option not addressing the **kinin system** or **complement pathway** directly would be incorrect.
**Option C:** Again, lacking specifics, but treatments not focused on **C1 esterase inhibitor** replacement or **kinin system** modulation would be incorrect.
**Option D:** This would be incorrect if it doesn't involve **C1 esterase inhibitor** or modulation of the **kinin system**.
**Clinical Pearl / High-Yield Fact**
A crucial point to remember is that **C1 esterase inhibitor** deficiency leads to overactivation of the **complement system** and **kinin system**, resulting in increased **bradykinin** levels, which causes the edema. Thus, treatments targeting these pathways are effective.
**Correct Answer:** D. Icatibant