o compare the adverse reactions of nonionic contrast media Ultravist and ionic contrast media An-giografin in enhanced CT 325 cases were injected with Ultravist
1338 cases with Angiografin. The patientswere divided into three groups : The normal . high risk and aged group. They were compared by single-blindstudy. The superiority of Ultravist in individuals and total adverse reactions to Angiografin (P<0. 001) wasdemonstrated. Though Ultravist is safer than Angiografin
there is no significant difference between the twoaged grups (P>0. 05).