LOCAL REACTIONS AFTER INJECTION OF IODINATED CONTRAST MATERIAL - DETECTION, MANAGEMENT, AND OUTCOME

Rationale and Objectives. The authors assessed the frequency, sequelae , and risk factors of extravasation of intravenously administered iodi nated contrast media. Materials and Methods. All patients with local r eactions after intravenous injection of contrast media between Novembe r 1994 and December 1996 were studied. Comparison was made with data o btained from a control group of 100 patients with no local reactions w ho underwent contrast material-enhanced computed tomography (CT). Resu lts. Local reactions were reported in 56 (0.25%) of 22,254 patients wh o received intravenous injections of iodinated contrast media. Fifty-o ne patients experienced extravasation, and five patients experienced l ocal irritation in the absence of clinically detectable extravasation. Extravasation occurred during CT (n=46), urography (n=4), and venogra phy (n=1). Contrast material was non-ionic in 37 cases and conventiona l ionic in 14 cases of extravasation. Extravasated volumes exceeded 30 mL in 22 patients and 100 mL in six patients. Forty-five (80%) of 56 patients with local reactions had complete resolution of symptoms with in 24 hours. Only four patients had symptoms for more than 48 hours. N o surgery was required. Compared with the control group, patients with extravasation were significantly more likely to have been injected wi th small-bore catheters (21 or 22 gauge) and to have been injected at low or high rates. Conclusion. Symptoms of contrast medium extravasati on usually resolve quickly. In patients with extravasation, injections are more likely to have been performed with techniques that vary from normal practice.