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    The information contained on the RemakeHealth website and its blog is provided for your general information only. RemakeHealth does not give medical advice or engage in the practice of medicine. RemakeHealth under no circumstances recommends a particular treatment or test for specific individuals and in all cases recommends that you consult your physician before pursuing any course of treatment or test.

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    What does an MRI of the IACs (IAMs) show?

    Posted by Ravi Sohal on Tue, Sep 22, 2009
      
      
      
      
      
      

    mri iac iamMRI scans are frequently used to evaluate the internal structures of the brain. IAC MRIs are a type of Brain MRI that is used to evaluate the structures of the Internal Auditory Canal - IAC (aka Internal Auditory Meatus - IAM).

    The IAC contains among other structures the 8th cranial nerve. This is a large nerve that conducts hearing and balance signals from your inner ear structures. This nerve can become damaged, inflamed or give rise to a tumor commonly called an "acoustic neuroma." Most IAC MRIs are ordered to rule out an acoustic neuroma in patients who are experiencing dizziness, ringing in the ears, hearing loss, fullness, for example. Although these tumors are slow growing and generally benign, they are close to vital structures in the brain and can be difficult to treat.

    An MRI of the IACs is done with MRI dye. The dye helps detect small tumors and subtle inflammation that a non-contrast MRI may miss.

    IAC MRIs also include the cerebellum, brainstem, vessels of the back of the brain and other nearby structures. Some IAC MRI protocols also include a few scans of the entire brain.

    Your MRI IAC Scan

    An MRI of the IACs generally takes about 30-40 minutes or so to complete. If you are going for one, wear loose comfortable clothing and remember to remove all metal (jewelry, phones, rings, etc) before going into the MRI scan room.

    This test will be done with IV MRI contrast. The first part of the test is done without contrast. Then the scan is paused and the table on which you are lying will be pulled out (remember don't move!). The technologist will then inject the IV dye and return the table into the tube for the remainder of the scan.

    If you're insured, you may need to have your test authorized (approved) by your insurance company first. If you're uninsured and need to look up prices and buy an MRI scan of the IACs (IAMs), you can use our website to look up MRI scan costs and then purchase with your credit card.

    Have you had an MRI of IACs scan? What was it like? Please leave your comments below.

    32 Comments Click here to read/write comments

    What does an IV injection of contrast for a CT scan feel like?

    Posted by John Holden on Tue, Apr 14, 2009
      
      
      
      
      
      

    Many CT scan tests require injection of IV contrast (dye). IV stands for intravenous which means the contrast is given through a vein. Generally a vein in your hand, lower arm, or near the elbow joint is used. The contrast is used to "highlight" internal organs such as the liver, kidneys, and pancreas. It helps detect and characterize tumors, infection and disease of the vessels.

    Contrast scans are ordered either "with only", meaning contrast is given and then the images are taken or "with and without", which means images are taken before the contrast is administered and then immediately during or after the contrast is injected.

    Into the scan room

    Once you're in the CT scan room you'll be taken to a table and asked to lie down. The CT technologist may take a few images in preparation for the scan and/or do the "non-contrast" part of the scan first. That is, take images that are needed before the IV contrast injection is done.

    The IV tray

    Most facilities will have the IV materials on a metal tray near the CT scan machine. This will include a tourniquet, alcohol pad, IV catheter, gauze, tape, syringe with saline, and some tubing to connect to the injector (the part of the machine that injects the IV contrast - it looks like a big ray gun).

    Getting the IV

    Unlike a blood draw, the IV catheters used are larger and will need to stay in a vein. Larger IVs are used as the contrast is injected at a high rate. You'll be asked to straighten your arm and hand. The technologist will place the tourniquet around your upper arm or wrist.

    The technologist will check for a vein, sometimes using a tapping or brushing movement across your arm. After finding a suitable vein, the technologist will clean the area with an alcohol pad and position the IV over the vein. The IV is advanced through the skin and into the vein. This might take a few tries, particulary for patients who may be dehyrated, have had multiple injections, or chemotherapy.

    Once the IV is placed, a small amount of saline is sometimes injected to test it. The IV is then hooked via tubing to the injector. The table will move and the technologist will leave the room to begin the injection and scan.

    The injection

    The contrast will flow from the injector, through the tubing and into the IV and then the vein. You may feel a "pop" in the beginning of the injection right at the IV site. As the contrast goes into the vein you will feel the fluid rush up your arm. You shouldn't feel any pain - if you do alert the technologist immediately.

    After a few seconds the contrast reaches your chest and heart and you'll feel an intense warm feeling. Some have described it as a "sunburst" or like drinking a hot cup of coffee in one gulp. You might also get a metallic taste in your mouth.

    Usually the scanner begins taking pictures within 10-20 seconds after the injection begins and continues to take pictures after the injection is completed.

    After the injection

    The technologist will remove the IV and place a small piece of gauze with tape over the IV site. 

    What about side effects?

    The most common side effect of contrast is a mild allergic reaction - sneezing, coughing, asthma-like symptoms and small hives. Severe allergic reactions can lead to heart and lung failure. Contrast can also damage the kidneys. If the contrast leaks from the IV and into the tissues of the hand or arm, it can cause pain and inflammation.

    These are just some of the side effects of contrast. Your local Radiology center or hospital can give you more detailed information about the risks and benefits of IV contrast.

    And remember, if you've had a side effect to contrast in the past, make sure you alert the Radiology facility and your doctor in advance.

    85 Comments Click here to read/write comments

    What is an MRI with contrast (dye)?

    Posted by John Holden on Sun, Jan 11, 2009
      
      
      
      
      
      

    MRI Conrast DyeAn MRI is high-tech medical imaging test that can help your doctor diagnose many different types of disease.  You can read more about MRI scans here.

    When your doctor decides to send you for an MRI he or she will fill out a prescription or a Radiology referral form. The form will usually have your name, your symptoms, the doctor's signature, and the type of test being ordered.

    The MRI test your doctor orders usually matches the body part where you are having symptoms. For example, if you have knee pain, your doctor will order an MRI of the Knee. Your doctor or the Radiologist interpreting the scan may recommend that the test be done with contrast (aka dye). 

    MRI Contrast Indications

    Roughly, about 20% of MRIs are ordered with contrast. MRI contrast is used in specific circumstances and  enhances the MRI scan images. Here are some common reasons why contrast is given:

    • History of tumor, cancer, or surgery
    • Looking for infection, inflammation, or cancer
    • Evaluating blood vessels
    • Investigate a finding on the pre-contrast part of the scan

    MRI Contrast Side Effects

    Though MRI contrast (gadolinium) is safer than the CT contrast, there are still some risks associated with the injection. The most common side effects include:

    • Allergic reaction
    • Flushing/redness
    • Hives
    • Blood clots
    • Dizziness
    • Shortness of breath

    The Contrast Injection

    The injection is usually given after some "pre-contrast" MRI scans have been done. The techologist or Radiologist wil come into the MRI scan room and move the table out of the MRI machine. He or she will then place a tourniquet around your arm or hand. Using a small butterfly needle or an IV, they'll inject about 10-20 milliters of dye into your vein. The needle is removed and you are placed back into the MRI machine for the rest of the scan.

    Passing on the Contrast Injection

    As a patient, you have the right to be informed and decide how you receive medical treatment. If you are afraid of the injection or potential contrast side effects, you should discuss this with your doctor or the Radiologist at the facility and learn more about why the contrast is being given.

    Have you had an MRI Scan with contrast? What was your experience like? Leave your comments below.

    577 Comments Click here to read/write comments

    What is a CT scan with contrast?

    Posted by John Holden on Sun, Jan 11, 2009
      
      
      
      
      
      

    CT scan contrast injectorAn CT scan is high-tech medical imaging test that can help your doctor diagnose many different types of disease.  You can read more about CT scans here. (For MRI and contrast click here.)

    When your doctor decides to send you for a CT scan he or she will fill out a prescription or a Radiology referral form. The form will usually have your name, your symptoms, the doctor's signature, and the type of test being ordered.

    The CT scan your doctor orders usually matches the body part where you are having symptoms. For example, if you have pain in your stomach, your doctor will order a CT scan of the abdomen. Many CT scans are ordered with contrast (aka dye). If your doctor orders it without contrast, on occassion the Radiologist interpreting the scan may recommend that the test be done with contrast. 

    CT Scan Contrast Indications

    Many CT scans are ordered with contrast.  Here are some common reasons why contrast is given:

    • History of tumor, cancer, or surgery
    • Looking for infection, inflammation, or cancer
    • Evaluating blood vessels
    • Investigate a finding in a scan done without contrast

    CT Scan Contrast Side Effects

    There are risks associated with the injection. The most common side effects include:

    • Mild to life-threatening allergic reaction
    • Flushing/redness and hives
    • Shortness of breath
    • Nausea, vomitting
    • Blood clots
    • Dizziness

    Some people develop allergies to CT scan dye over time. For example, a patient may have no side effects with multiple contrast CT scans but then experience one. Because the risk of severe life-threatening reaction increases, if these patients need another CT scan with contrast they are pre-medicated with Benadryl and steriods to reduce the risk or severity of another reaction.

    If you've had a reaction to CT scan or IVP dye in the past you should inform your doctor and the Radiology staff.

    The Contrast Injection

    You might have some non-contrast images taken before the contrast is administered. The techologist will then come into the CT scan room and back the table out of the tube. The technologist or the Radiologist will then place a tourniquet around your arm or hand and insert an IV and connect it to plastic tubing. The tubing is connected to an injector. The IV will remain in your vein for the rest of the test. You'll be asked to place your arms above your head. The technologist will leave the room. The scanner will start and the injection will begin. You'll feel a warm rush of fluid into your arm, chest and abdomen. Some people describe the feeling as "rushing heat" or a "sun burst". After the test, the IV is removed.

    Passing on the Contrast Injection

    As a patient, you have the right to be informed and decide how you receive medical treatment. If you are afraid of the injection or potential contrast side effects, you should discuss this with your doctor or the Radiologist at the facility and learn more about why the contrast is being given.

    Have you had an CT Scan with contrast? What was your experience like? Leave your comments below.

    417 Comments Click here to read/write comments

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