Morphologic endothelial response to meglumine diatrizoate: an electron-microscopic study

Area of Science:

• Vascular Biology
• Radiology
• Toxicology

Background:

• Intra-aortic injections are common in diagnostic imaging.
• Contrast media can potentially affect vascular endothelium.
• Understanding these effects is crucial for patient safety.

Purpose of the Study:

• To investigate ultrastructural changes in vascular endothelium.
• To compare effects of meglumine diatrizoate and hypertonic saline.
• To assess dose-dependent vascular lesions in rats.

Main Methods:

• Intra-aortic injection of 65% meglumine diatrizoate and equiosmolal hypertonic saline in rats.
• Electron microscopy examination of vascular endothelium.
• Observation at 5 minutes, 20 minutes, and 1 hour post-injection.

Main Results:

• Cell shrinkage and intercellular cleft widening observed in large arteries.
• Vascular lesions were similar between meglumine diatrizoate and saline groups.
• Muscle capillary changes were less severe than in large arteries.

Conclusions:

• Both contrast media and saline induce similar ultrastructural vascular lesions.
• Endothelial cell damage is dose-dependent and transient.
• Further research needed to mitigate contrast-induced vascular injury.