[Are nonionic contrast media identical in their tolerability? Results of a double-blind randomized multicenter study with iomeprol and iopromide].

Since a larger number of nonionic contrast media is available for the radiologist, the question arises as to whether they differ in their clinical tolerability. A double-blind, randomized, two-group comparison of phase IV with lomeprol and lopromide was carried out at 6 hospitals involving a total of 1,200 patients with the indication for computed tomography. The contrast media doses and the flow in computed tomography of the skull, thorax, and abdomen were, depending on the centre, between 50 and 200 ml and 0.5 and 3.0 ml/s, respectively. The biostatistical evaluation of adverse events which were probably contrast medium-related produced a highly significant difference between the two contrast media in favor of lomeprol (p = 0.0005). The difference in the reactions of heat, nausea, and vomiting is of clinical relevance as such adverse events may negatively affect the examination procedure and the opacification in spiral computed tomography.