Cats ( n = 10 in each group ) received a combination of medetomidine ( 60 gkg ( -1 ) ) and ketamine ( 10 mg kg ( -1 ) ) alone ( MedK ) ; combined with morphine ( 0.2 mg kg ( -1 ) ) ( MedKM ) , or combined with tramadol ( 2 mg kg ( -1 ) ) ( MedKT ) IM .