Pediatric Radiology

, Volume 38, Issue 5, pp 489–496 | Cite as

Gadolinium and nephrogenic systemic fibrosis: time to tighten practice

  • Iosif A. Mendichovszky
  • Stephen D. Marks
  • Clare M. Simcock
  • Øystein E. Olsen
Open Access
Review

Abstract

Nephrogenic systemic fibrosis (NSF) is a relatively new entity, first described in 1997. Few cases have been reported, but the disease has high morbidity and mortality. To date it has been seen exclusively in patients with renal dysfunction. There is an emerging link with intravenous injection of gadolinium contrast agents, which has been suggested as a main triggering factor, with a lag time of days to weeks. Risk factors include the severity of renal impairment, major surgery, vascular events and other proinflammatory conditions. There is no reason to believe that children have an altered risk compared to the adult population. It is important that the paediatric radiologist acknowledges emerging information on NSF but at the same time considers the risk:benefit ratio prior to embarking on alternative investigations, as children with chronic kidney disease require high-quality diagnostic imaging.

Keywords

Nephrogenic systemic fibrosis Gadolinium Chronic kidney disease Children 

Introduction

Nephrogenic systemic fibrosis (NSF; formerly named nephrogenic fibrosing dermopathy) is a systemic disease that was first described in 1997 and recognized as a separate clinical entity in 2000 [1, 2, 3, 4]. Until now, all confirmed cases of NSF have been reported in patients with chronic kidney disease (CKD) with estimated glomerular filtration rates (eGFR) <60 ml/min per 1.73 m2 or end-stage renal failure requiring renal replacement therapy. NSF affects both sexes with a reported age range of 8–87 years and has no race predilection [5, 6]. Relatively few paediatric cases have been reported, which may reflect the lower incidence of CKD in children.

Patients present with swelling, induration and tightening of the skin, often with a peau d’orange appearance or textured plaques, papules or nodules, usually limited to the extremities (from ankles to mid-thighs and from wrists to mid-upper arms). The skin lesions sometimes involve the trunk, but spare the neck and face. The condition develops over days to weeks and may ultimately result in severe contractures and disability. Patients may experience burning, itching or sharp pains in involved areas. Deep pain has also been described in the hips and ribs. Radiography may reveal calcifications of the soft tissue [1, 5, 6, 7, 8, 9]. Systemic involvement may be fatal with fibrosis of the lungs, skeletal muscles, pleura, pericardium, myocardium, kidneys, muscle, bone, testes and dura [2, 3, 4, 10]. Clinical differential diagnoses include scleroderma, scleromyxoedema, systemic sclerosis/morphoea, eosinophilic fasciitis and eosinophilia-myalgia syndrome, and the condition may mimic cellulitis, panniculitis or drug reactions [6, 7, 8, 11, 12].

The severity of CKD appears to be the main determinant of risk. Also, several contributing risk factors have been suggested: hypercoagulability and thrombotic events; cardiomyopathy; hepatic disease; idiopathic pulmonary fibrosis; systemic lupus erythematosus; brain tumours; recent surgical procedures, especially those with a major vascular component; and other proinflammatory conditions, including liver transplantation [5, 6, 8, 13, 14].

A specific aetiology is still unknown. The only common factor in all patients is the underlying kidney disease, with most patients dialysis-dependent. However, NSF has also been reported in patients who have never been dialysed [1, 5, 6, 8]. The physiopathological mechanism for fibrosis is not yet known. Histopathologically, biopsies from the skin lesions show a proliferation of fibrocytes (which may extend into subcutaneous tissue), together with thick collagen bundles and surrounding clefts with a variable amount of mucin and elastic fibres. Fibrocytes have a specific immunophenotype and express CD34, CD11b, CD45, HLA-DR, CD71, CD80, CD86, which implies that they are recruited from the circulation and do not arise as a result of proliferation in situ. Inflammatory cells are not usually evident, although small clusters of perivascular mononuclear cells may be seen [11, 15, 16].

Therapeutic options in NSF are limited. Improvements have been reported with extracorporeal photopheresis, plasmapheresis, ultraviolet phototherapy, intravenous immunoglobulin and renal transplantation [17, 18, 19, 20, 21].

Link with gadolinium-based contrast agents

The main concern for the radiologist is a growing body of evidence that clinical use of gadolinium-based contrast agents may trigger the disease. A number of patients with NSF seem not to have had any previous gadolinium exposure, but these are still under investigation. Grobner [22] was the first to report this association in January 2006. Grobner described nine patients with end-stage renal failure on dialysis who underwent MR angiography (MRA) with gadodiamide (Omniscan; GE Healthcare, Chalfont St Giles, UK); five (mean age 57.2±10.7 years) developed NSF after 2–4 weeks. All patients who developed NSF had confirmed metabolic acidosis, whilst all patients who did not develop NSF had normal pH and bicarbonate level at the time of the MRA. The average contrast agent volume used was 35 ml.

Marckmann et al. [23] reviewed case notes from their own nephrology department from August 2005 to May 2006 and found 13 patients with confirmed NSF, all exposed to gadodiamide. All patients were adults (33–66 years of age, mean 50 years), developed NSF 2–75 days (mean 25 days) after gadolinium exposure and had an eGFR <8 ml/min. From this cohort of renal patients the authors estimated an odds ratio between 32.5 and 47.6 for developing NSF following gadolinium exposure.

The link between gadolinium exposure and NSF has been further strengthened by two reports of gadolinium deposits in tissue samples of patients with NSF. High et al. [24] detected gadolinium in 4 out of 13 skin and soft-tissue biopsies from seven patients with documented NSF. All patients with NSF received gadolinium-based contrast medium prior to disease and the interval between dosing and biopsy could be determined with certainty only for two of four patients (age range 4–11 months). The same group reported in a research letter following quantitative analysis of the four tissue samples in which gadolinium was detected that the amount of gadolinium in the affected tissue of patients with NSF was approximately 35- to 150-fold the level of gadolinium in the bone of healthy volunteers with normal renal function. In a case report, Boyd et al. [25] found gadolinium deposits in areas of calcium phosphate deposition in blood vessels in a 68-year-old patient with NSF who had been previously exposed to gadodiamide.

Sadowski et al. [26] retrospectively reviewed data from 13 patients with confirmed NSF (eight males, five females, age 17–69 years), all exposed to gadodiamide. The median time between onset of NSF symptoms and last contrast-enhanced MRI examination was 11.5 days. The dose of contrast agent administered varied from 0.1 to 0.31 mmol/kg (actual) body weight. At the time of the contrast-enhanced MRI all 13 patients had CKD (eGFR <60 ml/min per 1.73 m2) and were hospitalized for a proinflammatory event (major surgery, infection or vascular event). The group with NSF had significantly lower eGFR, more proinflammatory events, and more contrast-enhanced MR examinations per patient (P<0.002) than did the control group. The incidence of NSF in this study and institution was 4.6% per year.

A review of six further NSF cases that were also related in time to gadodiamide administration has recently been published [27]. Patients were aged 23–71 years and the onset of symptoms consistent with NSF was between 19 days and 2 months after gadodiamide exposure. All patients had severe renal failure and were exposed to a gadodiamide dose ranging from 0.11 to 0.36 mmol/kg body weight. Despite having normal serum bicarbonate, five of the six patients had an elevated anion gap metabolic acidosis.

Broome et al. [28] have recently reported a retrospective study of 12 patients with NSF, all of whom received a double dose (0.2 mmol/kg body weight) of gadodiamide 2–11 weeks before the development of skin fibrosis. This group included eight men and four women (age 26–64 years) and all had renal insufficiency at the time of gadodiamide administration. The odds ratio for development of NSF in the gadodiamide-exposed patients compared with the gadodiamide-unexposed patients was 22.3 and the prevalence of NSF among gadodiamide-exposed dialysis patients was 4.0%. The odds ratio for development of NSF with double-dose compared to single-dose gadodiamide administration was 12.1. Ten patients were dialysed within 2 days of gadodiamide administration, but this failed to prevent the development of NSF.

Although the overwhelming majority (around 90%) of patients with gadolinium-associated NSF had been exposed to gadodiamide, there are now several reports of exposure to other gadolinium contrast agents. In a recent editorial in Radiology, Kuo et al. [29] reported 57 patients with NSF investigated by the United States Food and Drug Administration (FDA). In 43 of these the NSF was linked to gadodiamide; in 6 to gadopentetate dimeglumine (Magnevist; Berlex Imaging, Montville, N.J.); in 2 to gadoversetamide (OptiMARK; Mallinckrodt, St. Louis, Mo.); and in 3 to gadodiamide plus gadoversetamide; in 3 other patients, the associated specific gadolinium-based MR contrast agent was not definitively identified. Sadowski et al. [26] also reported one patient with confirmed NSF associated with both gadodiamide and gadobenate dimeglumine (MultiHance, Bracco Diagnostics, Milan, Italy). NSF related to specific gadolinium-based contrast agents is also monitored by the manufacturers, who have recently published several reports [30, 31, 32]. In a retrospective study in Scotland of 1,826 haemodialysis patients, Collidge et al. [33] found a positive association between the cumulative dose of gadodiamide and the development of NSF. Patients who developed NSF had received a higher median cumulative dose of gadodiamide (0.39 mmol/kg vs. 0.23 mmol/kg in patients without NSF).

A case-control study by Marckmann et al. [34] conducted in 19 patients with histologically verified NSF and 19 matched controls found that increasing cumulative gadodiamide exposure, high-dose epoietin-b treatment and higher serum concentrations of ionized calcium and phosphate increase the risk of gadodiamide-related NSF in patients with renal failure.

Pathophysiology

Although not completely understood, several factors are known to contribute to the physiopathological mechanism in NSF. Gadolinium chelates are mostly eliminated through the kidneys. Renal impairment will therefore prolong the presence of these agents in the body, facilitating the release of the toxic free gadolinium ion (Gd3+) by dissociation from its chelate (chemical imbalance, acidosis, anion gap, inflammation) and its subsequent binding to endogenous ions. This chemical process, known as transmetallation, may be promoted by acidosis and anion gap, e.g. under inflammatory conditions [35, 36, 37, 38, 39, 40]. It has therefore been suggested that both the chemical stability of a particular chelate (cyclic compounds are more stable than linear ones in vitro) and the dose administered are risk factors for triggering NSF [28, 41]. Once released Gd3+ forms hydroxides and phosphates (insoluble at a pH >6.2) and these are probably engulfed by phagocytic cells [42]. This might affect the reticuloendothelial system, inhibiting the activity of certain enzymes with consequent foreign body and fibrous reactions [41, 43, 44, 45]. Gadodiamide, the agent involved in NSF in most patients to date, is the least stable in terms of susceptibility to transmetallation in vitro, being an open-chain compound [46]. Free gadolinium ions may remain in the body for weeks to months, allowing more time for toxic effects [47]. Gadolinium is a well-known inorganic calcium channel blocker and its acute toxicity may also partly be explained via this mechanism [48, 49]. A review of the properties of commercial gadolinium contrast agents and their relation to NSF is presented in Table 1.
Table 1

Properties and approval status of extracellular gadolinium contrast agents (CNS central nervous system, MRA magnetic resonance angiography, N/A not available)

Chemical name

Trade name

Manufacturer

Charge and chemical structure

Conditional stability at pH 7.4 (log)

Excess chelate (mg/ml)

Thermodynamic stability constant (log)

Kinetic stabilitya

Body region(s) approved

Approval status

Approved doses for imaging (mmol/kg)

Approved doses for children (mmol/kg)

NSF related to gadolinium

Gadodiamide

Omniscan

GE Healthcare

Nonionic linear

14.9

12

16.9

35 s

CNS, whole body

USA, EU, Japan

Body 0.1–0.3, CNS 0.1–0.3, MRA 0.1–0.3

From 6 months: 0.1

Yes (180 cases worldwide)

Gadopentetate dimeglumine

Magnevist

Bayer Schering Pharma

Ionic linear

17.7

0.4

22.1

10 min

CNS, whole body

USA, EU, Japan

Body 0.1, CNS 0.1–0.2, MRA 0.1–0.3

0.1 (doses of 0.2 may be used if necessary for children older than 2 years)

Yes (78 cases worldwide)

Gadobenate dimeglumine

MultiHance

Bracco

Ionic linear

16.9

None

22.6

N/A

CNS, liver

USA, EU

Liver 0.05, CNS 0.1, MRA not approved

Not approved <18 years

Yes (1 case in a patient coadministered Omniscan)

Gadoversetamide

OptiMARK

Tyco

Nonionic linear

15.0

28.4

16.6

N/A

CNS, liver

USA

Body 0.1, CNS 0.1, MRA not approved

Not approved <18 years

Yes

Gadoterate meglumine

Dotarem

Guerbet

Ionic cyclic

18.8

None

25.8

>1 month

CNS, whole body

EU

Body 0.1, CNS 0.1–0.3, MRA 0.2

0.1

No

Gadoteridol

ProHance

Bracco

Nonionic cyclic

17.1

0.23

23.8

3 h

CNS, whole body

USA, EU, Japan

Body 0.1–0.3, CNS 0.1–0.3, MRA not approved

0.1 from 2 years, caution 6 months to 2 years, contraindicated <6 months

No

Gadobutrol

Gadovist

Bayer Schering Pharma

Non-ionic cyclic

N/A

N/A

21.8

5 min

CNS, MRA

EU, Canada

Body not approved, CNS 0.1–0.3, MRA (imaging 1 FOV) 0.1–0.15, MRA (imaging >1 FOV) 0.2–0.3

Not approved <18 years

No

Gadoxetic acid

Primovist

Bayer Schering Pharma

Ionic linear

N/A

N/A

23.5

N/A

Liver

USA, EU

Body 25 μmol/kg or 0.1 ml/kg, CNS not approved, MRA not approved

Not approved <18 years

No

Gadofosveset

Vasovist

Bayer Schering Pharma

Ionic linear

N/A

N/A

N/A

N/A

Abdominal and limb vessels

EU

MRA 0.03

Not approved <18 years

No

aKinetic stability: dissociation half-life at pH 1.0.

Table modified from Bellin MF (2006) Eur J Radiol 60:314–323.

NSF in children

NSF in children has also been reported. Five patients under 18 years of age have thus far been reported (discussed below) out of a total of ten in the central database of the International Center for Nephrogenic Fibrosing Dermopathy Research (Dr. S. Cowper, personal communication). However, 13 possible patients have been reported to an online paediatric nephrology forum in June 2007 (https://listhost.uchicago.edu/mailman/private/pedneph/) and these are still being investigated in relation to previous gadolinium exposure.

In 2003 Jan et al. [50] reported two paediatric patients with nephrogenic fibrosing dermopathy: a 16-year-old female patient with a life-long history of kidney failure and an 8-year-old boy with a 9-month history of membranoproliferative glomerulonephritis type II. Both patients had the clinical and histopathological features of NSF and no contrast-enhanced MRI procedures were known to be associated with these patients. However, this was before the publication of a possible link with gadolinium.

Jain et al. [51] reported two more patients with NSF in 2004: a 9-year-old boy on peritoneal dialysis and a 19-year-old male on haemodialysis with a 10-year history of previous failed renal transplants, both diagnosed with NSF on skin biopsies. The 9-year-old boy had a solitary MRA performed in June 2002, approximately 2 months prior to development of NFD. The history of the 19-year-old male was more complicated as he underwent 13 separate MRA procedures, all with gadolinium contrast agents, between April 2000 and August 2004. At least nine of the MRAs were performed prior to the NFD diagnosis in January 2003 [52]. Also, both patients had persistent metabolic acidosis in the months preceding the development of NSF, which may have been a contributing factor [22].

DiCarlo et al. [53] described another patient with histopathologically proven NSF. This patient was a 17-year-old male renal transplant recipient (15 years following transplant) who had recently begun peritoneal dialysis due to graft failure. No relationship to MRI investigations was mentioned.

Recently, Auron et al. [54] reported two patients with NSF. One of the patients was a 13-year-old boy previously reported at the age of 8 years by Jan et al. [50] in 2003 (discussed above). The second patient was a 20-year-old male who at the age 14 years was diagnosed with acute monoblastic leukaemia and 2 years later underwent bone marrow transplant and later developed kidney failure. No references to contrast-enhanced MRI are available from these reports.

Our own hospital has a large paediatric renal unit with up to 30 renal transplants per year. We have actively used MRI both for concurrent conditions and complications to CKD, as well as for providing a presurgical vascular road-map, using contrast-enhanced MRA (Gd-DTPA, Magnevist, Schering, Germany, 0.1–0.3 mmol/kg, i.v.). A review of all contrast-enhanced scans in children referred via our nephrology service (March 2002 to March 2007) showed that 75 nephrology patients (neonate to 18 years of age; median 9.6 years) had had 93 MRI scans with a follow-up of at least 6 months. There were no patients with NSF in this high-risk cohort.

Regulatory advice

Regulatory advice can be obtained from the websites listed in Table 2. The FDA has issued a general warning for all gadolinium-based contrast agents and advise against their use in patients with eGFR <30 ml/min per 1.73 m2 and in all patients with acute renal insufficiency “unless the diagnostic information is essential and not available with non-contrast enhanced magnetic resonance imaging”. At the FDA’s request the manufacturers of gadolinium-based contrast agents have revised the product labels, which now include a new boxed warning and a new warnings section that describes the risk of NSF. The European Medicines Agency has so far not published any update of general contraindications, and is not in a position to do so since all but one gadolinium-based agent are licensed by individual member states’ regulatory bodies. However, the issue was discussed at a meeting of its pharmacovigilance group in June and May 2007, and issued specific advice as follows (http://www.mhra.gov.uk):

The use of Omniscan® and Magnevist® is contraindicated in patients with severe renal impairment (i.e. GFR or eGFR <30 mL/min/1·73 m2). Omniscan is also contraindicated in patients with renal dysfunction who have had, or who are awaiting, liver transplantation. For patients with moderate renal impairment (GFR or eGFR 30–59 ml/min/1·73 m2) or neonates and infants up to 1 year of age, Omniscan and Magnevist should be used only after careful consideration. All patients should be screened for renal dysfunction by obtaining a history and/or laboratory tests, especially before Omniscan or Magnevist are used. Haemodialysis shortly after administration of a gadolinium-containing MRI contrast agent in patients currently under haemodialysis may be useful for removal of contrast agent from the body. However, there is no evidence to suggest that haemodialysis can prevent or treat development of NSF. Careful consideration should also be given to the use of the other gadolinium-containing MRI contrast agents in patients with severe renal impairment.

Table 2

Websites for regulatory updates and for information and registration of cases (accessed on 20 September 2007)

Organization

Information provided

URL

European Medicines Agency

Regulatory information

http://www.emea.europa.eu/

US Food and Drug Administration

Regulatory information

http://www.fda.gov/cder/drug/infopage/gcca/default.htm

Information for healthcare professionals

http://www.fda.gov/cder/drug/InfoSheets/HCP/gcca_200705.htm

International Center for Nephrogenic Fibrosing Dermopathy Research

Updated information and contact details for registration of cases

http://www.icnfdr.org/

Consequences for paediatric practice

There is an associated high morbidity and mortality with CKD, and imaging aids clinical management, such as assessment of secondary vasculopathies, infections etc, and surgical planning prior to renal transplantation. Patients at risk also include children with known or suspected CKD, as well as newborns and infants with renal immaturity or congenital cardiopathy. It seems plausible that impaired excretion, dissociation of the gadolinium chelate, and prolonged tissue retention of gadolinium is a trigger for NSF in patients with CKD. This risk increases with cumulative dose of gadolinium, with decreasing GFR <60 ml/min per 1.73 m2, and in the presence of acidosis and proinflammatory conditions. The scarcity of reported children with NSF may well be due to the lower prevalence of CKD and secondary conditions in children. It is therefore imperative that paediatric practitioners are prudent and immediately tighten their local policies for use of intravenous gadolinium-based contrast agents.

It is difficult at present to suggest general guidelines, because:
  • The absolute risk of gadolinium exposure, as well as the risk associated with the suspected contributing clinical and biochemical factors, is unknown. Each case must therefore be assessed individually.

  • The risk attributable to the kinetic stability of different gadolinium-based agents is not clear. The majority of cases have been reported in association with a less stable agent (gadodiamide); however, we are still in an early stage of recording cases, and also the market share and the actual use of different agents in this patient population is not fully known. Thus, it seems reasonable to discontinue the use of gadodiamide in at-risk patients.

  • The relationship to dose is not completely known. Since there is no indication that we are dealing with a side effect not related to dose, it seems reasonable to reduce the dose of gadolinium if possible, and also to monitor the cumulative dose in at-risk patients.

  • It is unclear whether acidosis correction before gadolinium administration and haemodialysis immediately after gadolinium administration can prevent the development of, or treat, NSF, but such actions should be considered in children already on haemodialysis. This underlines the necessity for good communication between radiologists and nephrologists, both for issuing local guidelines and for management of the individual child.

It is often the case that MRI is requested after an inconclusive US examination. In our own experience, more meticulous patient preparation and dedicated rescanning of the patient with US can often give diagnostically adequate results. In patients with CKD not yet on dialysis CT is not a desirable alternative due to ionizing radiation and the nephrotoxicity of iodinated contrast agents. However, CT may provide an option in patients who are already on dialysis. MRI without intravenous contrast agent administration has not yet been validated for vascular anatomy prior to renal transplantation, but several techniques may be valuable, such as 3-D-balanced steady-state free precession imaging and time-of-flight angiography.

Patients with renal impairment may be referred for MRI from non-nephrology units and a crucial question is how to identify them. Our approach would be to include a mandatory tick box on the referral form requiring the referring clinician’s statement about renal function, and also to include a question about any known renal problems on the patient/guardian prescan checklist. This is a pragmatic approach, which will need revision after an initial phase.

Conclusion

We would advocate prudence, and in practice suggest:

  • Information collection from clinicians and patients/guardians on renal dysfunction and active collaboration with the local nephrology unit.

  • A case-by-case assessment in terms of the necessity for gadolinium-enhanced MRI, and whether an alternative test (repeat US, noncontrast-enhanced MRI, CT) would be acceptable.

  • Cumulative dose recording, reduction of the dose of any gadolinium-based contrast agent, and acting accordingly to guidance published in the literature.

  • Longer follow-up, especially in high-risk children.

  • GFR measurement or estimation should be part of a systematic prescan investigation in children with known or suspected renal dysfunction; however, a general screening is probably not justified.

  • To minimize the risks, we should take advantage of the current knowledge, and would suggest using cyclic nonionic compounds as they are more stable in vitro and therefore theoretically less likely to undergo transmetallation.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Iosif A. Mendichovszky
    • 1
  • Stephen D. Marks
    • 2
  • Clare M. Simcock
    • 3
  • Øystein E. Olsen
    • 3
  1. 1.Radiology and Physics Unit, Institute of Child HealthUniversity College LondonLondonUK
  2. 2.Department of Paediatric NephrologyGreat Ormond Street Hospital for Children NHS TrustLondonUK
  3. 3.Department of RadiologyGreat Ormond Street Hospital for Children NHS TrustLondonUK

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