[Adverse reactions to contrast media for intravenous use. A comparison between ionic and nonionic media]

The purpose of this study was to show that the nonionic contrast media of low osmolarity are better tolerated than ionic media of high osmolarity, which to date are most frequently used in the authors hospital. We found that adverse reaction occurred in 80% of the group in which nonionic contrast medium was used. The authors conclude that nonionic, low osmolarity contrast media significantly reduce the frequency of adverse reactions and increase their safe use.