Intravenous Contrast Agent Guideline

The following is intended to serve as a guideline for performing diagnostic studies that require contrast medium. Each case is unique and there will be times when the benefit of information gained from contrast administration will supersede the potential risk of reaction or renal toxicity. The following guidelines may not apply in these cases or in life threatening emergencies.

The following is intended to serve as a guideline for performing diagnostic studies that require contrast medium. Each case is unique and there will be times when the benefit of information gained from contrast administration will supersede the potential risk of reaction or renal toxicity. The following guidelines may not apply in these cases or in life-threatening emergencies.

  1. A current creatinine level must be available for all inpatients and for outpatients over 6o years of age prior to administration of intravenous contrast. “Current” is defined as within one month for outpatients and within one week for inpatients.  Please also reference a complete list of the recommended indications for measurement of serum creatinine (Who must have a creatinine level prior to IV contrast?)
  2. Patients with an elevated creatinine should receive intravenous contrast only if absolutely necessary. The following table provides a guideline for the use of contrast by type relative to the patients creatinine (mg/dL) or eGFR (%):

    UW Guidelines for Contrast Selection

    Diabetic

    Contrast Creatinine eGFR
    Iohexol ≤ 1.4 > 50
    Iodixanol 1.4 – 1.8 50-40
    No Contrast > 1.8 < 40

    Non-Diabetic

    Contrast Creatinine eGFR
    Iohexol < 1.8 > 40
    Iodixanol 1.8 – 2.4 40-30
    No Contrast > 2.4 < 30
  3. For an acutely traumatized patient for whom there is insufficient time to obtain a creatinine level, it is understood that the benefit of making an emergent diagnosis of a life-threatening injury outweighs the risk of contrast nephrotoxicity.
  4. Patients who have chronic renal failure and are on chronic dialysis may receive contrast. While the timing of contrast administration is not dependent upon dialysis, it is preferable that the next routine dialysis occurs within 24 hours following contrast. Contrast should be avoided in patients who are experiencing acute dialysis-dependent renal failure as there is hope that renal function will recover. However, contrast may be administered in this setting if the referring physician deems it necessary.
  5. Patients with multiple myeloma, sickle cell disease, homocystinuria, or active gout may receive intravenous contrast but should be well hydrated.
  6. Patients who report an allergy-like reaction to contrast may be premedicated according to protocol at the discretion of the radiologist. Resuscitation equipment and drugs should be readily available.
  7. Patients who report “passing out” or who needed resuscitation after past contrast injections, should have iodinated contrast only if alternative testing will not provide a satisfactory result. Same should apply to patients with allergic asthma or multiple severe allergies.
  8. Contrast reactions could be potentiated by anxiety. Therefore, if a patient is exceedingly anxious prior to contrast injection, they may be premedicated with: Midazolam, 2 mg IV titrated up to a maximum of 5 mg (contraindication = glaucoma)

Jessica Robbins, June 2015

Treatment of nonionic radiographic contrast material extravasation

Details of treatment, including link to patient Health Facts for You (HFFY) sheet

Initial treatment provided by the radiology technologist includes:

  • Elevation of affected extremity above the heart
  • Removal of any tight fitting clothing above the injection site
  • Milk the extravasated contrast toward the heart by intermittent compression of affected site by manual compression or an Ace wrap

Observation performed by nursing staff includes:

  • Typical observation periods of 1-2 hours are sufficient
  • Educate patient about signs of tissue compromise, and advise to seek medical attention if needed per UW Health Facts for You (HFFY)
  • Plastic surgery consultation based on symptoms, not quantity of extravasation

Plastic surgery consultation should be considered for any of the following reasons:

  • Skin blistering
  • Redness or streaks at the injection site
  • Altered tissue perfusion (decreased capillary refill in the region or distal to the injection site)
  • Increasing pain
  • Change in sensation distal to site of extravasation

Patient given Health Facts for You (HFFY) by rad tech if responsive, or printed by nursing prior to discharge.

Bicarb Protocol

Interventional Radiology Bicarb Protocol for CIN

Indication

Radiocontrast nephropathy is a common cause of hospital acquired acute renal failure and has been associated with an increased in-hospital mortality and LOS.1-2

Various prevention strategies have been employed such as pre and post procedural hydration, vasodilators and acetylcysteine administration.

A study from JAMA printed in May of 2004 indicates that hydration with a bicarbonate solution may better prevent contrast induced nephropathy than NS hydration. Most renal failure is associated with metabolic acidosis and low urinary pH. NS may contribute to acidosis while the bicarbonate solution will buffer the pH.3

Other advantages of this prevention strategy are the low cost, lack of side effects and ability to administer in a timely manner.

Administration/Dosing

Solution: 150 mEq NaHCO3 in 1000cc D5W

  1. 1 hour prior to contrast: Initial IV bolus – 3ml/kg/hour x 1 hour
  2. After 1 hour bolus: 1ml/kg/hour during contrast exposure and 6 hours post contrast.

References

  1. Levy EM, Viscoli CM, Hurwitz RI. The effect of acute renal failure on mortality: a cohort analysis. JAMA. 1996; 275: 1489-1494.
  2. McCullough PA, Wolyn R, Rocher LL, et al. Acute renal failure after coronary intervention. Am J Med.1997; 103: 368-375.
  3. Merten GJ, et al. Prevention of contrast-induced nephropathy with sodium bicarbonate: a randomized controlled trial. JAMA. 2004; 291: 2328-2334.

2004/Lisa Semmann, R.N., M.S., Interventional Radiology NP

Prophylaxis Policy for Patients Allergic to IV Contrast

Prophylaxis Policy for Patients with Moderate/Severe Reaction to Iodinated Contrast

  1. Ascertain the specific details of the prior reaction.  Determine:
    1. If the patient had a true reaction to intravascular contrast material
    2. Type of contrast used (if available)
    3. Type of reaction and severity
    4. Treatment and its result
    5. Level of patient anxiety
  2. Determine if an examination without contrast can provide adequate diagnostic information.
  3. If still convinced of the need for intravascular contrast, the service requesting  the scan should:
    1. Contact the radiologist scheduled on service for the proposed date of the study (GI/GU, CT, Angiography, Neuroradiology, or on-call resident for overnight/weekend Emergency Department patients).  If the staffing schedule is not available for the proposed date of the examination, then the Chief of the GI/GU Service (Dr. Perry Pickhardt), CT Service (Dr. Meghan Lubner), Angiography/Interventional Service (Dr. Orhan Ozkan), or Neuroradiology Service (consultant for the day) should be contracted.
    2. Discuss why an alternative imaging method will not suffice
    3. If the risk is determined to be acceptable; schedule the contrast examination and transmit prophylaxis instructions.
  4. Routine Contrast Reaction Prophylaxis (12 hour):
    1. Methylprednisolone (Medrol)
      1.  32 mg by mouth at 12 and 2 hours before contrast injection.
    2. Diphenhydramine (Benadryl):
      1. 50 mg intramuscular or oral 1 hour before contrast injectionOR
      2. 50 mg (or 25 mg per height/weight indication) intravenously 15-20 min before contrast injection
        Note:  The Benadryl must be used with the proviso that the patient does not drive a car or operate heavy machinery 4-6 hours after the Benadryl is administered.
        NEJM 1987; 317: 845-849.
  5. Rapid Contrast Reaction Prophylaxis (4 hours):
    1. To be used only in a truly urgent situation after discussion between the requesting service and the appropriate radiology service.
    2. The requesting service must place a note in HealthLink outlining the necessity of contrast-enhanced examination and the rapid prohpylaxis protocol.
    3. Hydrocortisone:
      1. 200 mg intravenously 4 and 1 hour before contrast injection
    4. Diphenhydramine (Benadryl):
      1. 50 mg intravenously 1 hour before contrast injection

Greenberger PA et al. Emergency administration of radiocontrast media in high-risk patients. J Allergy CLin Immunol. 1986; 77(4): 630-634.

 

Updated 6/24/2015, Jessica Robbins.

Metformin-Containing Medications

List of diabetic medications known to contain Metformin

  • ActoPlus Met®
  • ActoPlus Met XR®
  • Avandamet®
  • Fortamet®
  • Glucophage®
  • Glucophage XR®
  • Glucovance®
  • Glumetza®
  • Invokamet®
  • Janumet®
    Janumet XR®
  • Jentadueto®
  • Kazano®
  • Kombiglyze XR®
  • Metaglip®
  • PrandiMet®
  • Riomet®
  • Xigduo XR

Conditions Limiting the Use of IV Contrast

Conditions Which May Contraindicate The Use Of IV Iodinated Contrast

Pheochromocytoma

Non-ionic IV contrast may be safely administered in these patients based on Bessell-Browne et al, CT of Pheochromocytoma and Paraganglioma: Risk of adverse events with IV administration of non-ionic contrast material, AJR 2007; 188: 970-974 and the ACR manual. No follow-up blood pressure monitoring is needed. Direct injection of contrast medium into the adrenal or renal artery is to be avoided however, as this may cause a hypertensive crisis.

Allergies

Patients with allergies have twice the risk of contrast reactions compared to the average patient.

Asthma

Patients with asthma have five times the risk of contrast reactions compared to the average patient.

IL-2 (Interleukin – 2 Chemotherapy)

Patients who are currently on IL-2, or have received IL-2 in the recent past, have an increased risk of delayed reaction. The reaction can occur up to several hours after the injection, and can be mild to severe. Symptoms can include hives, rash, pruritis, fever, chills, joint pain, flu-like symptoms, tachycardia, or hypotension. Symptoms can be mild and self-limited, or severe requiring hospitalization. Patients who have experienced an IV contrast reaction while on IL-2, or after IL-2 therapy should not receive IV contrast for any future imaging unless an extreme situation arises. (IL-2 patients should NOT receive steroid pre-medication. That counteracts the intended effect of IL-2).

Patients receiving IV contrast who are currently on IL-2 therapy or for 6 months following the completion of IL-2 therapy must be monitored for a minimum of two hours after their CT scan. This is usually done in the oncology clinic or in our waiting room after the scan. Six months after the cessation of therapy or after 2 uneventful contrast-enhanced scans the patient may return to normal monitoring.

Diabetes, Renal Failure, Nephrectomy, Renal Transplant

Please see the IV contrast agent guidelines.

Metformin

Metformin is an oral antihyperglycemic medication administered alone or in combination (see a list of metformin containing medications). There have been case reports of patients developing lactic acidosis after receiving iodinated contrast material while on metformin. Therefore, if a patient is on metformin, or a metformin containing medication, determine which of the two following categories describes the patient’s situation:

  1. No evidence of acute kidney injury and an eGFR ≥ 30.  In this setting, metformin can be continued and there is no need to reassess renal function.
  2. Acute kidney injury or severe chronic kidney disease (stage IV or stave V, eGFR <30) OR arterial catheter studies that might result in emboli to the renal arteries. In this setting, metformin should be held 48 hours after the contrast bolus/procedure. Renal function should be reassessed 48 hours after the contrast load; if renal function is normal (or at baseline), metformin may be restarted.

Active Gout

A disease that causes hyperuricemia. The patient needs to have a normal creatinine level and not be dehydrated prior to receiving IV contrast, to reduce the risk of acute renal failure. (note: patients with only a history of gout but not active are not considered at risk)

Multiple Myeloma

A malignant bone condition that causes kidney failure, dysproteinemia, abnormal proteins in the plasma, and abnormal urine proteins (Bence Jones proteins). IV contrast may cause the proteins to precipitate resulting in renal tubular obstruction and possibly renal failure. Multiple myeloma is only considered a risk factor for contrast nephrotoxicity when combined with pre-existing renal insufficiency.


Creatinine level must be known prior to IV contrast administration. Please reinforce the importance of hydration after contrast administration.