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Radiology, Vol 183, 741-744, Copyright © 1992 by Radiological Society of North America

ARTICLES

Role of low-osmolality contrast media in thromboembolic complications: scanning electron microscopy study

E Casalini
Department of Radiology, Istituti Clinici di Perfezionamento, Milan, Italy.

Numerous in vitro studies have found that clot formation may occur when blood is mixed directly with nonionic low-osmolality contrast media during angiographic procedures because of activation of hemostasis in the catheter; ionic contrast media, on the other hand, inhibit clot formation. Thirty patients were injected with low-osmolality contrast media--15 with ioxaglate, an ionic dimer, and 15 with iopamidol, a nonionic monomer. The inner wall of the angiographic catheter was studied with electron microscopy after selective catheterization of supraaortic vessels. Clot formation of various extent was observed in nine (60%) of the patients administered iopamidol. No coagulation process was found in the catheters of the patients administered ioxaglate. Results indicate that nonionic, low-osmolality contrast media may play a role in the formation of thromboembolisms.


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