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1 From the Department of Radiology (R.A.K.H., N.M.G.A., J.F.D.) and Clinic for Obstetrics (S.W.), University Hospital Zurich, Römistrasse 100, CH-8091 Zurich, Switzerland; Schering, Berlin, Germany (T.F., E.P.); and the Department of Biostatistics, University of Zürich, Switzerland (B.S.). Received September 30, 1999; revision requested November 15; revision received December 10; accepted December 16. Supported in part by Schering, Berlin, Germany. Address correspondence to R.A.K.H. (e-mail: rahel.kubik@dmr.usz.ch).
PURPOSE: To analyze the amount of gadopentetate dimeglumine excreted into human breast milk following intravenous injection of a clinical dose.
MATERIALS AND METHODS: Gadopentetate dimeglumine was injected intravenously in 20 lactating women (2338 years of age). Breast-feeding was interrupted for at least 24 hours. Serial samples of expressed milk were collected and analyzed for gadolinium concentration by means of inductively coupled plasma atomic emission spectrometry at a wavelength of 342.247 nm.
RESULTS: The cumulative amount of gadolinium excreted in human breast milk during 24 hours was 0.57 µmol ± 0.71 (SD; range, 0.053.0 µmol). The excreted dose was thus less than 0.04% of the administered intravenous dose (range, 0.001%0.04%; mean, 0.009% ± 0.010) for all cases.
CONCLUSION: Less than 0.04% of administered gadopentetate dimeglumine is excreted into human breast milk. The amount transferred to a nursing infant orally would be far more than 100 times less than the permitted intravenous dose (200 µmol per kilogram of body weight) for neonates. The recommendation of a 24-hour suspension of breast-feeding for lactating women should thus be reconsidered.
Index terms: Breast Contrast media, complications, **.121433, **.58 Contrast media, effects, **.12143, **.58 Contrast media, toxicity, **.12143, **.58 Gadolinium, **.12143 Infants, newborn Magnetic resonance (MR), contrast media, **.12143
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