METHODS	Pigs then received intravenous anesthesia and were randomized to 6 treatment groups : ( 1 ) normothermia ( NT ; rectal temperature 38.5 degrees C , n = 18 ) ; ( 2 ) 18 hours 50 % xenon with NT ( n = 12 ) ; ( 3 ) 12 hours HT ( rectal temperature 33.5 degrees C , n = 18 ) ; ( 4 ) 24 hours HT ( rectal temperature 33.5 degrees C , n = 17 ) ; ( 5 ) 18 hours 50 % xenon with 12 hours HT ( n = 18 ) ; and ( 6 ) 18 hours 50 % xenon with 24 hours HT ( n = 17 ) .\