Rationale and Objectives. We compared the tolerance and efficacy of iohexol-300, a nonionic low-osmolar monomer, with those of ioxaglate-320, an ionic low-osmolar dimer, in lower limb phlebography. Methods. One hundred twenty inpatients were randomly divided into two groups in this double-blind comparative study. Two hundred milliliters of contrast medium (100 mi per leg) was injected intravenously. The immediate tolerance was classified as discomfort (i,e., sensation of warmth, pain, coldness related to the injection) and adverse events occurring up to 1 hr after administration. Delayed tolerance was followed up to 8 days after the examination. The main parameter was immediate adverse events. Image quality was assessed by a radiologist using a visual analog scale. Results. The number of immediate adverse events was significantly higher in the ioxaglate group (P < .02). The more frequent events were digestive disorders and skin rashes; 13 of these events were reported in the ioxaglate group, but none were reported in the iohexol group (P < .001). The other parameters were not significantly different in the two groups. Conclusion. We found a similar efficacy and a better tolerance of iohexol-300 than ioxaglate-320 in lower limb phlebography.
