<prompt> General anaesthetic agent causing sympathetic stimulation: September 2011ThiopentalKetamineMidazolamEtomidate  <response>: Ans. B: Ketamine Ketamine stimulates sympathetic system causing tachycardia and hypeension so it is intravenous anaesthetic of choice for shock Disadvantages of Midazolam: Incidence of apnea, respiratory depression and hypotension are higher and more profound than diazepam Thiopentone causes hypotension which is more because of venodilatation Ketamine: It is phencyclidine Causes dissociative anaesthesia Increases all pressures BP, intraocular tension, intracranial tension Causes profound analgesia Causes hallucinations, illusions and delusions Contraindicated in: Intracerebral mass or hemorrhage Causes bronchodilation used in asthmatics and increases cardiac output used in hypovolumic shock 