Anaesthetic agent with vasoconstrictor is contraindicated in?
**Core Concept**
In medical practice, certain anaesthetic agents are combined with vasoconstrictors to prolong their duration of action and to reduce systemic toxicity. However, this combination is contraindicated in specific situations due to the potential for severe complications.
**Why the Correct Answer is Right**
The combination of anaesthetic agents with vasoconstrictors is contraindicated in areas with compromised circulation, such as in Raynaud's disease or in patients with severe peripheral vascular disease. This is because vasoconstrictors can further reduce blood flow to already compromised areas, leading to tissue ischemia and potentially severe consequences. In these situations, the use of vasoconstrictors can exacerbate the underlying condition, leading to gangrene or other serious complications.
**Why Each Wrong Option is Incorrect**
* **Option A:** Vasculitis - While vasculitis is a condition that involves inflammation of blood vessels, it is not a contraindication for the use of vasoconstrictors with anaesthetic agents.
* **Option B:** Hypertension - The use of vasoconstrictors with anaesthetic agents may actually be beneficial in patients with hypertension, as it can help to reduce blood pressure.
* **Option C:** Diabetes mellitus - While patients with diabetes mellitus are at increased risk of peripheral vascular disease, this is not a direct contraindication for the use of vasoconstrictors with anaesthetic agents.
**Clinical Pearl / High-Yield Fact**
When using anaesthetic agents with vasoconstrictors, it is essential to carefully evaluate the patient's vascular status and to consider alternative options if there is any concern about compromised circulation.
**Correct Answer:** C.