<prompt> Which of the following anesthetic agent lacks analgesic effect: March 2013N20ThiopentoneKetamineFentanyl  <response>: Ans. B i.e. Thiopentone Thiopentone Ultra sho acting barbiturate because of rapid redistribution, Lacks analgesic effect, First sign on intra-aerial injection: - White hands IV injection presents as: - Pain, - Hypotension etc. CI in: Porphyria may precipitate porphyria 