Manage Contrast Media Safely - ARRT Radiography Exam

1. What is the first priority intervention when a patient develops wheezing and respiratory distress after contrast injection?

   Maintain airway and provide high-flow oxygen. Airway maintenance and oxygenation are critical to prevent hypoxia in acute respiratory distress.

2. Which sign most strongly suggests contrast extravasation during injection?

   Swelling and pain at the injection site. These local symptoms indicate contrast leakage from the vessel into surrounding tissues.

3. Which lab value is most directly used to assess renal function before iodinated contrast?

   Serum creatinine (to estimate eGFR). Creatinine levels enable calculation of eGFR, which predicts risk of contrast-induced nephropathy.

4. Which oral diabetes medication is classically managed around iodinated contrast due to lactic acidosis risk if AKI occurs?

   Metformin. Renal impairment from contrast can cause metformin accumulation, risking lactic acidosis.

5. What is the correct immediate action when contrast extravasation is suspected at the IV site?

   Stop injection immediately. Halting the process prevents additional contrast from leaking into tissues, minimizing damage.

6. Which condition increases risk for severe bronchospasm with contrast administration?

   Asthma. Asthmatic patients have hyperreactive airways, making them prone to contrast-induced bronchospasm.

7. What is the correct action if a patient with prior severe contrast reaction arrives without a documented premedication plan?

   Hold contrast and contact the radiologist. This prevents potential severe reactions by allowing development of a safe administration plan.

8. Which medication is first-line for anaphylaxis from contrast media (per emergency protocols)?

   Epinephrine. It acts quickly to reverse bronchospasm, hypotension, and other life-threatening anaphylactic features.

9. Which route of contrast administration has the highest risk of systemic reactions?

   Intravascular (IV or intra-arterial) administration. Direct bloodstream entry allows rapid systemic distribution, heightening reaction potential.

10. What is the key renal risk associated with iodinated contrast administration?

    Contrast-associated acute kidney injury. Iodinated contrast can induce nephrotoxicity, especially in at-risk patients, leading to renal function decline.

11. What is the most common presentation of a delayed iodinated contrast reaction?

    Maculopapular rash. It represents a common T-cell mediated hypersensitivity response occurring days after exposure.

12. What is the correct patient instruction if a delayed contrast reaction occurs after discharge?

    Seek medical care and notify the imaging department. This ensures timely medical intervention and proper reporting for follow-up and documentation.

13. Which medication class increases risk for more severe anaphylactoid reactions and reduces epinephrine response?

    Beta-blockers. Beta-blockers impair compensatory mechanisms, worsening reactions and blunting epinephrine's effects.

14. Which symptom is most concerning for a severe allergic-like contrast reaction requiring emergency response?

    Laryngeal edema/stridor. This indicates potential airway compromise, demanding immediate intervention to prevent obstruction.

15. Which time frame best defines a delayed reaction to iodinated contrast?

    Occurs more than 1 hour after exposure. Delayed reactions typically manifest from 1 hour to several days post-administration.

16. Which patient condition is a contraindication to gadolinium-based contrast due to NSF risk?

    Severe renal impairment (very low eGFR). Poor renal function impairs gadolinium clearance, raising the risk of nephrogenic systemic fibrosis.

17. What is the correct immediate action if a patient reports itching and develops a few hives after contrast injection?

    Stop injection and assess; notify radiologist. Ceasing injection limits further exposure while assessment and notification ensure proper management.

18. What is the primary clinical risk of high-osmolality iodinated contrast compared with low-osmolality agents?

    Higher rate of adverse reactions and discomfort. High-osmolality agents disrupt cellular function more due to greater osmotic load, increasing reaction rates.

19. Which finding best indicates a physiologic contrast reaction rather than an allergic-like reaction?

    Transient nausea or vomiting. Such symptoms arise from direct osmotic or vagal effects of contrast, not hypersensitivity.

20. Which finding best indicates a mild allergic-like contrast reaction rather than a physiologic reaction?

    Limited urticaria (hives) and pruritus. These symptoms indicate an immune-mediated response, unlike non-immune physiologic effects.

21. Which contrast should be used instead of barium when GI perforation is suspected?

    Water-soluble iodinated contrast. These agents are safer as they can be absorbed and excreted if perforation allows extravasation.

22. Which contrast type is most commonly used for routine intravascular CT enhancement?

    Water-soluble iodinated contrast media. These agents are preferred for their excellent vascular opacification and rapid excretion, making them ideal for CT imaging.

23. What is the key contraindication to barium sulfate for GI studies?

    Suspected GI perforation. Barium can cause severe peritonitis if it leaks into the peritoneal cavity through a perforation.

24. Which documentation item is most important to record immediately after any contrast reaction?

    Signs/symptoms, timing, treatment, and outcome. Comprehensive records support patient care, future risk assessment, and legal requirements.

25. What is the most important historical risk factor for an iodinated contrast reaction?

    Prior allergic-like reaction to iodinated contrast. A history of reaction indicates hypersensitivity, greatly elevating the risk of recurrence.

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