Doctor insights on:
Allergic Reactions To Contrast Dye
Whats the dye used in angiography? Ive tried researching online, but cant find an answer. Im allergic to a lot of things, and im afraid I might have a bad reaction to the dye/contrast medium. How can I find out?
Different dyes used: Ask your cardiologist or radiologist who is performing the procedure and ask what dye is going to be used. There are different classes of rcm and they are classified according to their tonicity. The isoosmolar reagents are the least likely to result in reactions. Let your physician know your concerns and they will walk you through the options. ...Read more
See below: Allergic reaction to ct scan contrast may range from mild skin rash and itching to severe skin rash and cardiac arrest. Patients at risk are those with previous adverse reactions to iodine-based contrast materials, history of asthma, history of allergy. Contrast reaction may be reduced or prevented if appropriately treated before the scan, but this is not 100%. ...Read more
There is a common misunderstanding that one can be allergic to iodine yet this is incompatible with life -our thyroid hormone production depends on it.
You are allergic to the muscle protein in shellfish and not to the iodine. The contrast dye reaction is from the molecular structure of the dye which releases histamine. You are not at higher risk for a dye reaction because of a shellfish allergy ...Read more
I'm proned 2 allergic reactions but never a reaction to tattoo/hair dye. I just got a tattoo & hair dyed on same day (diff. Colors) will this harm me?
Allergic reaction to MRI dye? I am very allergic to all sorts of things, so I'm a bit paranoid about getting an MRI done. Do you know if it's common to have an allergic reaction to MRI dye? If so, what type of bad reactions do people have? Is there a way
Acute allergic reactions to MRI contrast material ("dye") are rare, occuring in less than 0.1% of injections. Most reactions are mild, for example a rash, itching, or nasal stuffiness. However, some reactions are moderate or severe and require immediate medical management. Moderate reactions include shortness of breath, increased or decreased heart rate, or increased or decreased blood pressure. Severe reactions include respiratory distress, abnormal heart rhythm, seizure, or cardiopulmonary arrest. A radiologist, who is a physician who specializes in diagnostic imaging, is always available near the scanner to manage contrast reactions.
There is no way to know ahead of time if you will have an allergic reaction to the dye. Potential factors that may increase your risk of an acute allergic reaction include a history of previous allergic reaction to iv-administered contrast medium (either gadolinium-containing, which is used for mri, or iodine-containing, which is used for ct), a prior allergic reaction to a substance other than contrast media, or a history of asthma. If your risk for a severe reaction is high, for example if you had a severe reaction in the past, your doctor may offer you steroids as premedication before the scan. ...Read more
See below: With iodinated based contrast you may get allergic reaction ranging from mild skin rash to severe rash, difficult breathing, severe drop in blood pressure and even cardiac arrest. Patients at risk are those with previous reaction, history of asthma or allergy. Please consult with your doctor. ...Read more
Do artificial dyes(Red 40, Blue 1) cause allergic reactions such as swelling in throat just as natural dyes that come from plants do?
Food dye allergy?: Potentially serious reactions have been reported with a variety of food dyes (also labelled as "food coloring"). However, food dyes are so ubiquitous in foods that it's difficult to make a verifiable association without allergy testing. If you are concerned, you should try to avoid those of concern and consult an allergist to conduct specific testing. ...Read more
If I've had contrast CTPA scan before with no allergic reaction- what's the chances of me having a reaction with another CT scan with dye?
Low: Considering your body has been exposed to the contrast with no reaction, it is unlikely the same or similar contrast will bring any reaction. Nonetheless, speak with your doctor about your concerns so they can prepare and answer your questions thoroughly. Good luck. ...Read more
Maybe: Although ct scans are an excellent radiographic study, they can easily miss small bladder masses. If one should have a very large bladder mass, it will likely be seen. However, a cystoscopy is still required because the mass seen on ct scan does not neccessarily mean cancer. A tissue diagnosis with a biopsy is still required to make the definitive diagnosis. ...Read more
I have true allergy to Benadryl (diphenhydramine) (had hives when taking the dye-free for a headache.) is allegra safe for me? And would it help my allergic reactions?
Yes: Allergy to Benadryl (diphenhydramine) is rare if at all present. Allegra is quite different from Benadryl (diphenhydramine) in structure and thus should be safe for you. Make sure you are not allergic to the gelatin on the Benadryl (diphenhydramine) capsules. Whether Allegra would work for you or not is another issue but it should be no less effective than benadryl (diphenhydramine). ...Read more
Depends: The rate of clearance (or excretion) depends on the renal function of the patient. In patients with normal kidney function, 50% of the injected dose will be excreted at one hour, ~83% at three hours, and almost 100% at 24 hours. ...Read more
Possible: It is possible to be allergic to the dye in medications. That is why someone may react to one dose but not another with a different color. However, this is unusual. ...Read more
Itchy scalp rash.: Allergy to chemicals found in hair coloring would typically be first noticed as an itchy red rash on the scalp or hairline. It is a condition called contact dermatitis. Blistering may occur. The face, neck, and eyelids may also be involved. Some people might get red swelling, such as hives in these areas as well. Diagnosis would involve a chemical patch test by an allergist or dermatologist. ...Read more
If someone is allergic to Iodine, is there a strong possibility they are allergic to IV dye as well?
Short Ans is MAYBE: When you say IV contrast dye the word IODINE likely comes up in many minds. In other words, if we were on MEDICAL FAMILY FEUD & Richard Dawson were to say, "Name the top 5 chemicals contained in IV DYE" Well, first you'd ask to see the guy's driver's license since Dawson's been dead for a while now. Second, you'd realize that Iodine is only ONE TYPE of IV dye but it's still good to check. Cheers! ...Read more
If I have never had a reaction to home hair dye should I worry about one? Can i suddenly become allergic?
The culprit is a common chemical ingredient in permanent hair dyes, called para-phenylenediamine, or ppd. Ppd is found in more than two-thirds of commercial dyes, the researchers say, including many of the top-selling brands.
Patients with severe PPD reactions commonly develop painful rashes around the hair line or on the face, which often require treatment and can lead to hospitalization. ...Read more
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