CT Contrast Media and Patient Preparation Flashcards
6 cards from real Computed Tomography Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CT Contrast Media and Patient Preparation flashcards as text
What type of adverse reaction to iodinated contrast media involves an immune-mediated hypersensitivity response?
Answer: Anaphylactoid (allergy-like) reaction
Anaphylactoid reactions mimic true anaphylaxis (urticaria, bronchospasm, hypotension) but do not require prior sensitization and are not IgE-mediated.
A patient experiences mild urticaria after CT contrast injection. What is the most appropriate immediate action?
Answer: Administer diphenhydramine (Benadryl) and observe the patient
Mild urticaria (hives only, no systemic symptoms) is treated with antihistamines and close observation while monitoring for progression to a more severe reaction.
What is the recommended fasting time before IV contrast-enhanced CT in non-emergency patients?
Answer: 4 hours NPO for solids
A 4-hour fast is recommended before contrast CT to reduce aspiration risk in the event of nausea or vomiting, while preventing dehydration.
Which factor most significantly increases a patient's risk for a severe contrast reaction?
Answer: History of a prior severe contrast reaction
A prior severe contrast reaction is the single strongest risk factor for a repeat severe reaction, increasing risk approximately 5-fold.
What technique is used to time the CT acquisition to arterial contrast peak in CT angiography?
Answer: Bolus tracking (SmartPrep) or test bolus technique
Bolus tracking uses real-time low-dose monitoring of a target vessel; when attenuation reaches a threshold, the diagnostic scan is automatically triggered.
Contrast extravasation during CT injection most commonly occurs at which site?
Answer: The IV catheter insertion site in the antecubital fossa
Extravasation occurs when contrast leaks from a dislodged or infiltrated IV catheter into surrounding soft tissue, most often at the antecubital injection site.