At the present time, the Committee on Drugs and Contrast Media recommends the following concerning
the performance of contrast-enhanced MRI examinations in pregnant patients.
Each case should be reviewed carefully and gadolinium-based contrast agent administered only when
there is a potential significant benefit to the patient or fetus that outweighs the possible risk of exposure of
the fetus to free gadolinium ions.
A. The radiologist should confer with the referring physician and document the following in the radiology
report or the patient’s medical record:
1. That information requested from the MRI study cannot be acquired without the use of IV
contrast or by using other imaging modalities.
2. That the information needed affects the care of the patient and/or fetus during the pregnancy.
3. That the referring physician is of the opinion that it is not prudent to wait to obtain this
information until after the patient is no longer pregnant.
B. It is recommended that both pregnant patients undergoing an MRI examination and their referring
physicians should indicate that they understand the potential risks and benefits of the MRI procedure to
be performed, and the alternative diagnostic options available (if any), and that they wish to proceed.
Premedication of pregnant patients (with prior allergic-like reactions to iodinated or
gadolinium-based contrast media
Diphenhydramine and corticosteroids (most commonly prednisone and methyl-prednisolone) are
commonly used for prophylaxis in patients at risk for allergic-like contrast reactions to contrast media.
Diphenhydramine is classified as FDA category B. (FDA category B: Animal reproductive studies have
failed to demonstrate a risk to the fetus and there are no adequate well-controlled studies in pregnant women.)
Prednisone (FDA category C) and dexamethasone (FDA category C) traverse the placenta; however most of
these agents are metabolized within the placenta before reaching the fetus and therefore are not associated
with teratogenicity in humans. (FDA category C: Animal reproduction studies have shown an adverse
effect on fetus and there are no adequate and well-controlled studies in humans, but potential benefits may
warrant use of the drug in pregnant women despite potential risks.) However, sporadic cases of fetal adrenal
suppression have been reported. Methylprednisolone also classified as a class C drug, carries a small risk of
cleft lip if used before 10 weeks of gestation.
At the present time, the Committee on Drugs and Contrast Media recommends the following concerningthe performance of contrast-enhanced MRI examinations in pregnant patients.Each case should be reviewed carefully and gadolinium-based contrast agent administered only whenthere is a potential significant benefit to the patient or fetus that outweighs the possible risk of exposure ofthe fetus to free gadolinium ions.A. The radiologist should confer with the referring physician and document the following in the radiologyreport or the patient’s medical record:1. That information requested from the MRI study cannot be acquired without the use of IVcontrast or by using other imaging modalities.2. That the information needed affects the care of the patient and/or fetus during the pregnancy.3. That the referring physician is of the opinion that it is not prudent to wait to obtain thisinformation until after the patient is no longer pregnant.B. It is recommended that both pregnant patients undergoing an MRI examination and their referringphysicians should indicate that they understand the potential risks and benefits of the MRI procedure tobe performed, and the alternative diagnostic options available (if any), and that they wish to proceed.Premedication of pregnant patients (with prior allergic-like reactions to iodinated orgadolinium-based contrast mediaDiphenhydramine and corticosteroids (most commonly prednisone and methyl-prednisolone) arecommonly used for prophylaxis in patients at risk for allergic-like contrast reactions to contrast media.Diphenhydramine is classified as FDA category B. (FDA category B: Animal reproductive studies havefailed to demonstrate a risk to the fetus and there are no adequate well-controlled studies in pregnant women.)Prednisone (FDA category C) and dexamethasone (FDA category C) traverse the placenta; however most ofthese agents are metabolized within the placenta before reaching the fetus and therefore are not associatedwith teratogenicity in humans. (FDA category C: Animal reproduction studies have shown an adverseeffect on fetus and there are no adequate and well-controlled studies in humans, but potential benefits maywarrant use of the drug in pregnant women despite potential risks.) However, sporadic cases of fetal adrenalsuppression have been reported. Methylprednisolone also classified as a class C drug, carries a small risk ofcleft lip if used before 10 weeks of gestation.
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