Capillary leak syndrome is caused by which of the following drug
**Core Concept**
Capillary leak syndrome (CLS) is a rare but potentially life-threatening condition characterized by increased vascular permeability, leading to the leakage of fluid, proteins, and cells from the capillaries into the interstitial space. This results in hypotension, edema, and organ dysfunction.
**Why the Correct Answer is Right**
The correct answer is a monoclonal antibody, specifically rituximab, which is used in the treatment of non-Hodgkin's lymphoma and chronic lymphocytic leukemia. Rituximab works by depleting CD20-positive B cells, and in some cases, it can cause a capillary leak syndrome as an adverse effect. This is thought to occur due to the release of cytokines and the activation of complement, leading to increased vascular permeability.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is not a known cause of capillary leak syndrome. While some medications can cause fluid retention or edema, they are not typically associated with the severe vascular permeability seen in CLS.
* **Option B:** This option is incorrect because it is a medication used to treat hypertension, and it is not typically associated with capillary leak syndrome.
* **Option C:** This option is incorrect because it is a medication used to treat autoimmune disorders, and while it can cause fluid retention, it is not typically associated with the severe vascular permeability seen in CLS.
**Clinical Pearl / High-Yield Fact**
Rituximab-induced capillary leak syndrome is a rare but serious adverse effect that can occur in patients receiving this medication. It is essential to monitor patients for signs of CLS, including hypotension, edema, and organ dysfunction, and to discontinue the medication if these symptoms occur.
**Correct Answer:** C. Rituximab