To the Editor: Magnetic resonance imaging is increasingly usedto avoid the radiation used in computed tomographic scanning.Gadolinium contrast medium allows vascular imaging without thenephrotoxic effects associated with conventional contrast material.1
A 62-year-old man with suspected renal-artery stenosis underwentmagnetic resonance angiography (MRA) after receiving 40 ml ofgadolinium (Omniscan, Amersham Health). Analysis of a bloodsample obtained immediately after the MRA study revealed a plasmacalcium level of only 4.4 mg per deciliter (normal range, 8.8to 10.6). Six hours later, his calcium level was 7.2 mg perdeciliter. The patient had no symptoms, and Chvostek's and . . . [Full Text of this Article]
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