Computed Tomography Test CT Contrast Media and Patient Preparation 2

Question 1

What type of adverse reaction to iodinated contrast media involves an immune-mediated hypersensitivity response?

Accepted Answer

Anaphylactoid (allergy-like) reaction

Answer

Contrast nephropathy

Answer

Vasovagal syncope

Answer

Contrast extravasation

Question 2

A patient experiences mild urticaria after CT contrast injection. What is the most appropriate immediate action?

Accepted Answer

Administer diphenhydramine (Benadryl) and observe the patient

Answer

Immediately inject epinephrine

Answer

Continue the scan without intervention

Answer

Administer IV corticosteroids and discharge

Question 3

What is the recommended fasting time before IV contrast-enhanced CT in non-emergency patients?

Accepted Answer

4 hours NPO for solids

Answer

No fasting required

Answer

24-hour fast

Answer

12-hour fast

Question 4

Which factor most significantly increases a patient's risk for a severe contrast reaction?

Accepted Answer

History of a prior severe contrast reaction

Answer

Mild shellfish allergy

Answer

Asthma controlled with inhalers

Answer

Age over 65

Question 5

What technique is used to time the CT acquisition to arterial contrast peak in CT angiography?

Accepted Answer

Bolus tracking (SmartPrep) or test bolus technique

Answer

Fixed-delay scanning

Answer

Breathing command protocol

Answer

ECG gating

Question 6

Contrast extravasation during CT injection most commonly occurs at which site?

Accepted Answer

The IV catheter insertion site in the antecubital fossa

Answer

The aorta

Answer

The pulmonary veins

Answer

The renal pelvis