This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intravenous Anesthetic Agents, Subject name: Anaesthesia
[{'content': 'Which is/ are false regarding intra aerial injection of thiopentone \nSelect and explain. \nA. Stellate ganglion block can cause sympathectomy and vasodilation, B. Papaverine is used for dilatation of aery which is in spasm, C. Crystallization of thiopentone in aerial blood is the main cause, D. stop the injectionand remove the cannula', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Following accidental intra-aerial injection of thiopentone, immediatelystop the injectionandkeep the the cannula intact. Intra-aerial injection may cause acute, severe extremity ischaemia and gangrene. The degree of injury is related to the concentration of the drug. Treatment: Theneedle should not be removedand saline is administered the same needle so as to dilute the drug Administering heparinto prevent thrombosis Brachial plexus block or stellate ganglion blockto relieve vasospasm', 'role': 'assistant'}]