CAMRT Contrast Media and Pharmacology Questions and Answers 2

Question 1

A patient with a history of mild contrast reaction (hives) is scheduled for contrast CT. What protocol is recommended?

Accepted Answer

Premedicate with corticosteroids and antihistamines

Answer

Cancel the examination

Answer

Proceed without contrast

Answer

Use gadolinium instead

Question 2

What is the primary mechanism by which iodinated contrast enhances CT images?

Accepted Answer

Attenuates X-rays due to iodine high atomic number

Answer

Increases magnetic susceptibility

Answer

Emits radiation detected by CT detectors

Answer

Causes tissue fluorescence

Question 3

Which lab value must be checked before giving iodinated contrast to a diabetic patient on metformin?

Accepted Answer

Estimated glomerular filtration rate (eGFR)

Answer

Blood glucose

Answer

Complete blood count

Answer

Liver function tests

Question 4

What is the osmolality classification of iohexol (Omnipaque)?

Accepted Answer

Low-osmolality with fewer adverse reactions than HOCM

Answer

High-osmolality

Answer

Iso-osmolality for intrathecal use only

Answer

Ultra-low-osmolality for paediatric use

Question 5

A patient develops bronchospasm during contrast-enhanced CT. What is the first-line treatment?

Accepted Answer

Nebulized salbutamol

Answer

IV diphenhydramine

Answer

Subcutaneous epinephrine

Answer

IV atropine

Question 6

What is the recommended maximum contrast volume for a patient with eGFR of 35 mL/min?

Accepted Answer

Volume should not exceed the eGFR value (35 mL)

Answer

No contrast should be administered

Answer

Standard volumes without restriction

Answer

Reduce to 50% of standard dose