Red man syndrome is due to ?
**Core Concept**
Red man syndrome is a cutaneous adverse reaction associated with rapid infusion of certain medications, particularly vancomycin. It is characterized by flushing, erythema, and rash, often accompanied by pruritus and warmth of the skin. The pathophysiology of red man syndrome is thought to involve histamine release and vasodilation.
**Why the Correct Answer is Right**
Red man syndrome is primarily caused by the rapid infusion of vancomycin, which leads to the release of histamine from mast cells. Histamine then binds to H1 receptors on blood vessels, causing vasodilation and increased blood flow to the skin, resulting in the characteristic flushing and erythema. This reaction can be mitigated by slowing the infusion rate of vancomycin.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct medication associated with red man syndrome. While other medications may cause similar reactions, vancomycin is the most commonly implicated agent.
**Option B:** This option is incorrect because it does not accurately describe the pathophysiology of red man syndrome. While histamine release is involved, the reaction is not primarily due to anaphylaxis.
**Option C:** This option is incorrect because it does not specify the correct medication associated with red man syndrome. Other medications may cause similar reactions, but vancomycin is the most commonly implicated agent.
**Clinical Pearl / High-Yield Fact**
To minimize the risk of red man syndrome, it is essential to infuse vancomycin slowly, typically over 60-90 minutes. This can help reduce the incidence of histamine release and associated adverse reactions.
**Correct Answer: A. Vancomycin**