Data collected on side-effects of nonionic contrast media during the last couple of years agree in respect of lowering of adverse reactions in comparison to ionic contrast media. Statistic valuation of the different studies has been discussed controversially, but better results cannot be expected in the near future for data-collecting reasons: The data available so far suggest the application of nonionic contrast media. Economic reasons may postpone the change from ionic to nonionic contrast medium. They should be addressed and not the quality of the data published so far on the subject should be used as an excuse for the delay.
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