Saturday, February 28, 2015
CT Scans with Contrast for Sulfite Sensitive
A friend of mine in Canada, was recently facing this mandatory procedure, for discovery of a problem in a blood vessel. I found this valuable information on UCLA Medical site posting. Please feel free to discuss prior to a CT with Contrast Procedure with the Radiologist,
I might suggest the best possible way to solve this is to have a conversation with the person doing the examine and see if there is anything else they can give. If not, I would have all my rescue meds, Benedryl, B-12, Molybdenum, Vitamin C, and an epi-pen, handy and take all these meds before the procedure. I know that some time it is mandatory to be able to view problems in such small areas. This one of the dilemmas that face us when we get a serious problem, if you think it is worth the risk, to find out the truth, you have to make that choice, other wise the Doctors may never solve this issue for you. Please read thru to the end…Kathy Unfortunately the medical community is not as versed as we are on subjects concerning our sensitivity. Good Luck! Hope this Helps Everyone.
P.S. If necessary, and as a precaution, a steroid preparation may be given prior to the injection of IV contrast to alleviate allergic reactions from IV contrast. Here are the instuctions for that , I found doing research, its from UCLA Medical Center
Computed Tomography SectionRecommended Protocol for Management of Patients with Iodine Allergy or Known Allergy to CT IVRadiographic Contrast Media
1. Prior to scheduling the CT study,Requesting / Referring Physician consultation with a Radiologist is recommended. 2. Requesting / Referring Physician to prescribe Premedication, to be initiated prior to the CT exam.4.Recommended Adult Premedication: a. Prednisone- 50 mg by mouth at 13 hours, 7 hours,and 1 hour before contrast media injection, plus Diphenhydramine (Benadryl®), 50 mg intravenously, intramuscularly, orby mouth 1hour before contrast medium.
Or Methylprednisolone (Medrol®) –32 mg by mouth 12 hours and 2 hour, before contrast media injection. Anantihistamine (as in option 1) can also be added to this regimeninjection. 5.The patient will need a driver. Study may be rescheduled, if patient has no ride home.
Information About Intravenous and Oral Contrast Used in CT
Note: It is important that patients consult the imaging location performing their CT exam for specific instructions to follow when contrast will be used. The information contained herein is only a general guideline. There are four types of contrast agent used in CT:
– The type that is given via intravenous (through a vein) injection
– The type that is given orally
– The type that is given rectally
– A much less common type of contrast used in CT is inhaled as a gas and used for special lung and brain imaging. This technique (called Xenon CT) is only available at a small number of locations throughout the world and is only performed for rare cases.
CT Contrast Given Via Intravenous Injection
Intravenous contrast is used in CT to help highlight blood vessels and to enhance the tissue structure of various organs such as the brain, spine, liver and kidneys. “Intravenous&q uot; means that the contrast is injected into a vein using a small needle. Some imaging exams of the abdomen and gastrointestinal system use both the intravenous iodine and orally administered barium contrast for maximum sensitivity. The intravenous CT contrast is clear like water and has a similar consistency. It is typically packaged in glass bottle or vial. A sterile syringe is used to draw it from the bottle or a power injector is used to administer the contrast. Typically between 75 cc to 150 cc (about 2.5 oz. to 5 oz) of contrast is used depending upon the patient’ s age, weight, area being imaged and cardiovascular health.
Is Intravenous CT Contrast Safe?
Typically, a patient will be asked to sign an “informed consent form” prior to having an CT exam which uses iodine contrast. This form will outline the potential side effects of the iodine. Overall, iodine is safe and has been used for many years and in millions of x-ray, CT and angiogram studies without serious side effects. Iodine contrast increases the sensitivity of the CT study. Thus the benefits of using iodine contrast typically outweighs the risks. Patients should inform the radiologist or technologist if they have a history of allergies (especially to medications, previous iodine injections, or shellfish), diabetes, asthma, a heart condition, kidney problems, or thyroid conditions. These conditions may indicate a higher risk of iodine reactions or problems with eliminating the iodine after the exam. The most common side effect of iodine includes a warm or hot “flushed” sensation during the actual injection of the iodine and a “metallic” ; taste in the mouth, which usually lasts less than a minute or so. This can vary depending on the type of iodine used, the rate at which it is administered, and individual patient sensitivity. There is no treatment necessary for this sensation Another mild reaction that can take place following the administration of iodine is itching over various parts of the body with hives (bumps on the skin). This reaction can last from several minutes to several hours after the injection. This type of reaction is usually treated with medication administered by the radiologist, nurse, technologist or other physician. More serious reactions, although much less likely, may include breathing difficulty, swelling of the throat, or swelling of other parts of the body. These reactions can be more serious if not treated immediately. With newer types of “non-ionic&quo t; contrast (non-ionic means that the iodine has a different chemical structure than normal iodine contrast), the risk of an allergic reaction can be even less. Patients should discuss all of their questions with the imaging staff when they arrive and make sure they read and understand the “informed consent” form before having the exam. In some cases, a CT can still provide valuable information without the administration of a contrast agent, and the physician may decide this is the best course for the patient at risk of reaction to contrast.