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Gadolinium-based contrast raises nephrogenic systemic fibrosis risk

-Medicexchange.com

07/22/2008- Gadolinium-based contrast material used in magnetic resonance imaging (MRI) increases the risk for nephrogenic systemic fibrosis (NSF), according to a report in the June issue of the American Journal of Kidney Diseases.

Dr. Alexander J. Kallen from the Centers for Disease Control and Prevention, Atlanta, and colleagues conducted a case-control study of 19 patients with NSF treated at a St. Louis hospital dialysis unit and 57 matched controls from the same unit.

Fourteen patients with NSF had undergone MRI with contrast in the previous year, the authors report, with a median interval of 123 days from most recent contrast MRI to date of disease detection. Four of the remaining five patients had gadolinium exposure between 16 and 68 months before diagnosis.

The risk for NSF increased in a stepwise fashion for having one MRI, two to three MRIs, or four or more MRIs, compared with controls, the report indicates.

On multivariate analysis, exposure to gadolinium-containing contrast in the preceding six months increased the risk for NSF 6.59-fold, and exposure in the preceding one year increased the risk for NSF 8.97-fold.

"Providers should carefully weigh both the benefits and potential harms of contrast MRI in their clinical decision making and avoid the use of gadolinium contrast agents if possible in patients with renal failure," the authors conclude.

"If gadolinium contrast is needed, clinicians should use the lowest possible dose and limit the number of future contrast administrations."

"The mechanism by which gadolinium contrast might cause NSF is unknown," the researchers add.

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