Gadolinium Side Effects
Gadolinium used in magnetic resonance imaging (MRI) contrast agents can cause side effects ranging from nausea to thickening and scarring of connective tissue that could lead to death. The most common reactions occur almost immediately after injection and include headache and dizziness. Toxicity, nephrogenic systemic fibrosis (NSF) and gadolinium deposition disorder (GDD) are more serious, rare conditions that can happen months or years after undergoing an MRI scan; when they occur, these serious side effects are most commonly seen in patients with severe kidney problems.
The most common side effects of gadolinium-based contrast agents (GBCAs) are nausea, headache and dizziness, according to the drugs’ labels. Depending on the brand of drug used, people may also experience coldness at the injection site, altered taste, or the sensation known as pins and needles.
A 2016 study in Magnetic Resonance Imaging found headaches, bone and nerve pain, and skin thickening were the most commonly reported reactions in patients that were presumed to have gadolinium toxicity. In the study of 42 people with symptoms, brain fog and headaches lasted for more than three months in 29 people.
Vomiting can occur with less than 1 in 100 injections, according to Inside Radiology. Between 1 and 4 in 100 will notice mild nausea or a headache.
Studies and adverse event reports submitted to the U.S. Food and Drug Administration (FDA) link GBCAs to nephrogenic systemic fibrosis, a serious condition that causes skin tightening. In the most serious cases, nephrogenic systemic fibrosis can cause thickening or scarring of the internal organs, which could lead to death. This side effect appear mostly in patients who had pre-existing kidney conditions, and has been estimated to occur in about 4 percent of patients with severe kidney disease that receive GBCAs.
New warnings from the FDA, added in 2018, say gadolinium can stay in the body for months to years after receiving these drugs during an MRI scan. It can build up in bone, brain and kidney tissue. This is known as gadolinium retention.
Toxicity is a side effect of GBCAs that can occur within hours after undergoing an MRI scan with one of these contrast agents. Or it can manifest years later in people who have gadolinium buildup in their bodies.
Symptoms vary from person to person. The severity ranges from mild to severe.
- Pain in the bones or joints
- Burning or “pins and needle” sensations in the skin
- Brain fog
- Vision or hearing changes
- Changes to the skin, such as thickening or discoloration
- Nausea, vomiting, or diarrhea
- Difficulty breathing
- Flu-like symptoms
- Metallic taste
Causes and People at Risk
Linear GBCAs are more likely to cause toxicity than macrocyclic agents, based on their structure. These are the two types of GBCAs available in the U.S.
A 2016 study review published in Biometals suggested one linear GBCA called Omniscan caused skin lesions, skin thickening and cell swelling in rats. Scientists linked the lesions to high gadolinium concentrations in the skin, liver and femur.
Another study published in 2004 in Investigational Radiology showed Omniscan, a linear GBCA, left 2.5 times more gadolinium in human bone than ProHance, a macrocyclic agent.
People who have multiple MRIs with GBCAs potentially increase the risk for toxicity.
Other patients at greater risk of these problems are pregnant women, people who have kidney problems, people with conditions that cause inflammation, or children, according to the FDA.
Testing and Treatment
Few doctors understand this type of toxicity, and there are few methods to test for it. The main tests are urine and blood tests. However, according to an article in Radiology in 2018, normal ranges have not been defined for each GBCA, and these methods need to be tested and standardized before they can be used as a reliable technique for monitoring gadolinium levels.
Chelation is a treatment that can be used to remove toxic levels of heavy metals from the body, although it has not been well studied as a treatment for gadolinium toxicity. Chelation is a process where doctors administer chelating agents to patients. These agents bind gadolinium and remove it from the body through the kidneys.
Health providers may administer chelating agents through an IV, with a pill, as a suppository under the tongue or through a rectal suppository.
Because this type of toxicity may cause pain in the bones, skin or joints, some people use some type of pain relieving medication.
Some patients may respond to treatment involving immune system modulation, although this proposed benefit appears to be theoretical and has not been tested in patients. Immune modulation is using drugs or other agents to weaken or strengthen the immune system.
Nephrogenic Systemic Fibrosis (NSF)
Nephrogenic Systemic Fibrosis (NSF) is a disease that causes hardening and thickening of the skin and internal organs, which could potentially lead to death. According to the Cleveland Clinic, most, if not all, cases are caused by exposure to GBCAs.
Patients who developed the condition who had not been exposed to a GBCA in an MRI were exposed to gadolinium in another way, such as another test, surgery, an injury or an infection. Although the exact mechanism for how the chemical element causes the condition is not known, the risk increases with use of linear gadolinium, and as more gadolinium is administered overall.
Researchers consider the disease to be a rare but serious side effect of GBCAs. These drugs carry a boxed warning that says people with kidney problems are at risk for the disease.
About 4 percent of people with serious kidney problems develop the condition after exposure to the chemical element. At least 30 percent of cases are expected to result in death.
The FDA first alerted the public about the link between GBCAs and NSF in 2006. The agency advises against using GBCAs in certain patients with acute or chronic kidney problems.
Researchers have not reported NSF in patients with normal kidney function after receiving GBCAs.
Gadolinium Deposition Disease (GDD)
GDD is a relatively newly proposed condition, and it resembles NSF. However, GDD specifically occurs in people with normal kidney function.
Scientists think people who get GDD have a genetic abnormality that makes it difficult for their bodies to get rid of heavy metals; however, GDD is still being studied and agencies such as the FDA report that gadolinium deposition has not been directly linked to negative outcomes in patients with normal kidney function.
People who had normal or near-normal kidney function when they were injected with a gadolinium-based contrast agent but then developed toxicity symptoms are suing the drugs’ makers.
Please seek the advice of a medical professional before making health care decisions.