Iotrol versus metrizamide in lumbar myelography: a double-blind study

Area of Science:

• Radiology
• Neurology
• Medical Imaging

Background:

• Lumbar myelography is a diagnostic procedure to visualize the spinal canal.
• Contrast media are essential for effective myelography.
• Metrizamide has been a commonly used contrast agent, but associated with adverse effects.

Purpose of the Study:

• To compare the safety and efficacy of iotrol versus metrizamide as contrast media for lumbar myelography.
• To evaluate diagnostic imaging adequacy and patient-reported adverse reactions.
• To assess the neurological impact using electroencephalography (EEG).

Main Methods:

• Prospective, randomized, double-blind study involving 49 patients undergoing lumbar myelography.
• Patients were randomized to receive either iotrol (24 patients) or metrizamide (25 patients).
• Diagnostic imaging adequacy, adverse reactions, and EEG changes were recorded and compared.

Main Results:

• Diagnostic imaging adequacy was comparable between iotrol and metrizamide.
• Iotrol group reported significantly fewer adverse reactions (54%) compared to metrizamide (96%).
• Adverse reactions in the iotrol group were less severe and shorter in duration; no EEG changes observed post-iotrol, unlike metrizamide.

Conclusions:

• Iotrol is a safer alternative to metrizamide for lumbar myelography, offering comparable diagnostic quality with a better safety profile.
• Reduced incidence and severity of adverse reactions make iotrol a preferred contrast medium.
• The absence of EEG changes post-iotrol myelography indicates a potentially lower neurological risk.