<prompt> All true about accidental intra aerial injection of Thiopentone except:-Immediate intense vasoconstriction and excruciating painCause is precipitations of thiopental crystals in the aerial vassalsTo relieve pain we have to immediately remove the misplaced aerial cannula.Sympathectomy of the upper extremity produced by Stellate ganglion block may relieve vasoconstriction.  <response>: The accidental intra aerial injection of drug due to wrongly placed cannula MN 1. Leave the cannula in situ 2. Intra aerial injection of heparin 3. Lidocaine, papaverine phenoxybenzamine injected 4. Stellate ganglion block 