Following accidental intra–arterial injection of thiopentone, which should not be done?
## **Core Concept**
Accidental intra-arterial injection of thiopentone can lead to severe arterial spasm, thrombosis, and potential gangrene. The management involves immediate action to minimize damage to the affected limb. Understanding the appropriate steps is crucial.
## **Why the Correct Answer is Right**
The correct approach involves measures to dilute the thiopentone, relieve spasm, and prevent thrombosis. This includes administering a vasodilator (like papaverine or nitroglycerin), using a brachial plexus block for pain management and further vasodilation, and potentially anticoagulation. However, the specific action that should not be done is crucial.
## **Why Each Wrong Option is Incorrect**
- **Option A:** Administering a vasodilator is a recommended step to counteract arterial spasm.
- **Option B:** Doing a sympathetic block can help in increasing blood flow to the affected area and is considered a valid approach.
- **Option C:** Injecting lidocaine locally around the arterial sheath can help in relieving pain and possibly reducing spasm.
- **Option D:** Applying warmth or using a warm saline soak might seem like a plausible method to increase blood flow, but it is not recommended as an initial step because it does not specifically address the immediate need to relieve spasm or prevent thrombosis effectively.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that intra-arterial thiopentone injection requires immediate intervention to prevent limb ischemia. Among the interventions, **intra-arterial administration of heparin or papaverine** is often recommended to prevent thrombosis and relieve arterial spasm. Remember, the goal is to prevent permanent damage.
## **Correct Answer:** D. Applying warmth.