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Gadolinium Based Contrast Agents CE Credits Available CONSIDERATIONS IN THE SELECTION OF A NEW GADOLINIUM-BASED CONTRAST AGENT SUPPLEMENT TO MAY 2014 THE JOURNAL OF PRACTICAL MEDICAL IMAGING AND MANAGEMENT Considerations in the Selection of a New Gadolinium-Based Contrast Agent Michael F. Tweedle, PhD Emanuel Kanal, MD, FACR, FISMRM Robert Muller, PhD Stefanie Spielman Professor of Radiology Professor of Radiology and Neuroradiology Department of General, Organic & The Ohio State University University of Pittsburgh Medical Center Biochemical Chemistry Columbus, OH Pittsburgh, PA University of Mons Mons, Belgium Supported by an unrestricted educational grant from © May 2014 www.appliedradiology.com SUPPLEMENT TO APPLIED RADIOLOGY n 1 Publisher Kieran Anderson Executive Editor Cristen Bolan Art and Production Barbara A. Shopiro Applied Radiology and this supplement, Considerations in the Selection of a New Gadolinium-Based Contrast Agent, are published by Anderson Publishing, Ltd. The journal does not warrant the expertise of any author in a particular field, nor is it responsible for any statements by such authors. The opinions expressed in this supplement are those of the authors. They do not imply endorsement of advertised products and do not necessarily reflect the opinions or recommendations of our sponsors or the editors and staff of Applied Radiology. Copyright © 2014 by Anderson Publishing, Ltd., 180 Glenside Avenue, Scotch Plains, NJ 07076 All rights reserved. Cover images courtesy of Howard A. Rowley, MD. Considerations in the Selection of a New Gadolinium-Based Contrast Agent Our 3 esteemed faculty summarize the similarities and differences among the gadolinium-based contrast agents (GBCAs) currently utilized for magnetic resonance imaging (MRI), with emphasis on stability and relaxivity. Dr. Michael Tweedle focuses on the chemical design and properties of the macrocyclic GBCAs and Dr. Robert Muller focuses on the molecular structures of the linear agents, and how the ability to interact with serum proteins contributes to differences in relaxivity among these agents. Dr. Emanuel Kanal provides a clinical perspective, reviewing how both stability and relaxivity impact efficacy and safety. The goal of this supplement is to help radiologic technologists expand their understanding of the physicochemical properties of the various available GBCAs in order to better select among them for various applications. Michael F. Tweedle, PhD Emanuel Kanal, MD, Robert Muller, PhD Stefanie Spielman Professor FACR, FISMRM Department of General, of Radiology Professor of Radiology Organic & Biochemical Chemistry The Ohio State University and Neuroradiology University of Mons Columbus, OH University of Pittsburgh Mons, Belgium Medical Center Pittsburgh, PA CE Accreditation Information Considerations in the Selection of a New Gadolinium-Based Contrast Agent Program Information Date of Release: 1/15/14 Date of Expiration: 1/31/16 Estimated time to complete: 1 Hour Faculty Michael Tweedle, PhD, The Ohio State University Emanuel Kanal, MD, FACR, FISMRM, University of Pittsburgh Medical Center Robert Muller, PhD, University of Mons Target Audience Radiologic Technologists Learning Objectives Upon completion, participants should: • Understand the physicochemical similarities and differences among the available GBCAs • Understand how the chemical design of each agent affects its relaxivity • Understand the important practical issues of stability and safety Accreditation Radiologic Technologists This course meets all criteria and has been approved by the AHRA, The Association for Medical Imaging Management, for one (1) ARRT Category A CE Credit. Claim Credit Instructions 1. Visit: www.appliedradiology.org/cc5 2. Enter Course Code: 052014B 3. Follow prompts For assistance, contact Kieran Anderson at (908) 301-1995 or email [email protected] Considerations in the Selection of a New Gadolinium-Based Contrast Agent Michael F. Tweedle, PhD, Emanuel Kanal, MD, FACR, FISMRM, and Robert Muller, PhD he use of gadolinium-based because free gadolinium (Gd3+) is toxic lished evidence surrounding the efficacy contrast agents (GBCAs) to and, therefore, the ability of the ligand to and safety of these 3 groups of agents. enhance the sensitivity and bind tightly to the Gd ion is an important Finally, we discuss considerations when T 10 specificity of magnetic resonance imag- safety consideration. Moreover, since adopting a new GBCA for a radiology ing (MRI) has been part of standard 2006, when an association was made practice in order to maximize diagnostic clinical practice for over 2 decades. Cur- between the development of NSF and yield while minimizing patient risk. rently, there are 9 GBCAs approved by the administration of Gd,11 stability has the U.S. Food and Drug Administration become an even greater concern in the Macrocyclic GBCAs (FDA) that vary in a number of proper- selection of a GBCA. Three macrocyclic agents are cur- ties, some of which may significantly The 9 available GBCAs can be clas- rently approved by the FDA: gadoter- impact their clinical utility, particularly sified on the basis of relaxivity into 3 ate meglumine (Dotarem), gadobutrol for specific applications. So what cri- groups: macrocyclic standard relaxivity (Gadavist), and gadoteridol (Pro- teria should radiologists use to select a agents (including gadoterate meglumine Hance). In terms of relaxivity, all are GBCA? Of the various physicochemi- [Dotarem],12 gadobutrol [Gadavist],13 nonprotein binding and, therefore, stan- cal properties, the criteria most impor- and gadoteridol [ProHance]),14 linear dard relaxivity, with r1 relaxivities in the tant to radiologists for optimization of standard relaxivity agents (gadopen- range of 4 to 5 L·mmol-1s-1.21 In terms diagnostic efficacy and patient safety are tetate dimeglumine [Magnevist]),15 of stability, macrocyclic agents utilize a relaxivity and stability. gadodiamide [Omniscan],16 and gado- closed, cage-like ligand that surrounds A GBCA with a higher relaxivity pro- versetamide [OptiMARK]),17 and high- and binds tightly to the Gd ion, result- vides increased signal intensity, greater relaxivity agents, which interact with or ing in highly stable complexes (Table contrast enhancement, and improved overtly bind to proteins (the blood pool 2).10 Many published studies exist to diagnostic efficacy.1-3 In addition, the agent gadofosveset trisodium (Abla- support the high stability of these mac- higher signal seen with higher-relaxivity var),18 the liver imaging agent gadoxetic rocyclic agents relative to the linear agents affords the potential to use lower acid (Eovist),19 and the multipurpose agents and, in terms of clinical value, doses in patients at risk of developing agent gadobenate dimeglumine (Multi- these data can be considered to exist nephrogenic systemic fibrosis (NSF).4-9 Hance)20 (Table 1). While all 3 of these within a hierarchy, from in vitro, test- Stability is an important consideration high-relaxivity agents are linear in struc- tube data at the bottom all the way up ture, there are some interesting obser- to human in vivo data at the top (Figure Dr. Tweedle is a Stefanie Spielman vations regarding unconfounded NSF 1). When assessing the various data, it Professor of Radiology at The Ohio State association – or lack thereof – with these is important to recognize that higher- University, Columbus, OH; Dr. Kanal agents that will be covered below. level data (eg, clinical experience) always is Professor of Radiology and Neurora- Here we describe the differences trump data lower on the hierarchy (eg, diology at the University of Pittsburgh among these 3 groups of GBCAs, test tube numbers). Medical Center, Pittsburgh, PA; and Dr. including the advantages and disadvan- Test-tube data derived from GBCAs Muller is in the Department of General, tages of their physicochemical profiles as in solution demonstrate that as a class, Organic & Biochemical Chemistry, they pertain to the selection of a GBCA. the macrocyclic agents have high ther- University of Mons, Mons, Belgium. In addition, we summarize the pub- modynamic binding constants (log Ktherm © May 2014 www.appliedradiology.com SUPPLEMENT TO APPLIED RADIOLOGY n 1 CONSIDERATIONS IN THE SELECTION OF A NEW GADOLINIUM-BASED CONTRAST AGENT Table 1. Currently available GBCAs.12-20,41 Chemical Name Trade Name Structure Ionicity Concentration (M) Clinical Use Gadoterate Dotarem Macrocyclic Ionic 0.5 Multipurpose meglumine Gadobutrol Gadavist Macrocyclic Nonionic 1.0 Multipurpose Gadoteridol ProHance Macrocyclic Nonionic 0.5 Multipurpose Standard relaxivity Gadopentetate Magnevist Linear Ionic 0.5 Multipurpose dimeglumine Gadoversetamide OptiMARK Linear Nonionic 0.5 Multipurpose { Gadodiamide Omniscan Linear Nonionic 0.5 Multipurpose Gadofosveset Ablavar Linear Ionic 0.25 Blood Pool High trisodium relaxivity, protein Gadoxetic acid Eovist Linear Ionic 0.25 Liver interacting Gadobenate MultiHance Linear Ionic 0.5 Multipurpose { dimeglumine Table 2. Thermodynamic constants of GBCAs.13 and log Kcond [essentially log Ktherm mea- sured at physiologic pH]) (Table 2).10 Chemical Name Trade Name log K log K In vivo, the dissociation of GBCAs therm cond into gadolinium ion and ligand can be Gadoterate Dotarem 25.6 19.3 facilitated by a number of competing meglumine endogenous metals, such as zinc, cop- Gadobutrol Gadavist 21.8 14.7 per, calcium, and iron, all of which may Gadoteridol ProHance 23.8 17.1 work simultaneously to destabilize the complex and lead to its dissociation. This displacement of the gadolinium
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