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

Premedication reduces the risk of repeat reaction for patients with mild prior reactions.

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

Iodine (Z=53) causes significant X-ray attenuation through photoelectric absorption.

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

eGFR is checked because contrast-induced kidney injury could impair metformin clearance, risking lactic acidosis.

Question 4

What is the osmolality classification of iohexol (Omnipaque)?

Accepted Answer

Low-osmolality with fewer adverse reactions than HOCM

Answer

Iohexol is a non-ionic, low-osmolality contrast medium with significantly fewer adverse reactions.

Question 5

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

Accepted Answer

Nebulized salbutamol

Answer

Nebulized salbutamol directly relaxes bronchial smooth muscle for isolated bronchospasm.

CAMRT - Canadian Association of Medical Radiation Technologists Practice Test