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Neuroimaging contrast agents in ophthalmology.
A G Lee1, L A Hayman, A W Ross
1Departments of Ophthalmology, Neurology, and Neurosurgery, The University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA.
Survey of Ophthalmology
|November 30, 2000
Summary
Contrast agents like iodinated and gadolinium are vital for neuro-ophthalmologic imaging (MR, CT). While enhancing diagnosis, they pose risks, with nonionic agents and gadolinium generally safer than ionic iodinated agents.
Area of Science:
- Radiology
- Ophthalmology
- Neurology
Background:
- Contrast materials are essential for diagnosing neuro-ophthalmologic diseases using CT and MR imaging.
- Iodinated agents are used in CT, while gadolinium is used in MR imaging.
- Adverse effects from contrast agents range from mild to severe.
Purpose of the Study:
- To review the properties of contrast agents used in neuro-ophthalmologic diagnosis.
- To summarize the types and severity of adverse effects associated with these agents.
- To discuss risk factors for contrast-related adverse events.
Main Methods:
- Review of properties of iodinated and gadolinium contrast agents.
- Analysis of adverse reaction rates and severity for different contrast types.
- Comparison of MR imaging with CT scanning in neuro-ophthalmology regarding contrast safety.
Main Results:
- Ionic iodinated contrast agents are associated with the most frequent and severe side effects.
- Nonionic iodinated contrast agents have a lower rate of adverse reactions.
- Gadolinium-based contrast agents have uncommon but possible side effects.
Conclusions:
- MR imaging is often preferred in neuro-ophthalmology due to better soft tissue visualization and the relative safety of gadolinium contrast.
- Understanding contrast agent properties and risks is crucial for patient safety.
- Risk factors for adverse effects should be considered in clinical practice.