METHODS	After preoxygenation ( 3 min ) and induction of anesthesia with fentanyl ( 1-2 micrograms.kg-1 b.w. ) and thiopental ( 5 mg.kg-1 b.w ) patients were divided into two groups : group 1 patients ( without PPMV , n = 333 ) received succinylcholine 30s after thiopental followed by tracheal intubation .\