ARRT Patient Care 4

Question 1

What is the minimum gauge IV catheter typically required for CT power injection at rates of 3 mL/s or greater?

Accepted Answer

18 gauge

Answer

22 gauge

Answer

24 gauge

Answer

26 gauge

Question 2

A patient with known multiple myeloma is being prepared for contrast CT. The primary concern is:

Accepted Answer

Bence-Jones proteins increasing risk of contrast-induced nephropathy

Answer

Increased radiation sensitivity

Answer

Allergy to iodine due to immunosuppression

Answer

Need for higher contrast volumes for diagnostic quality

Question 3

When scanning a pregnant patient with suspected pulmonary embolism, which approach is most appropriate?

Accepted Answer

Perform CT pulmonary angiography after consulting with the clinical team and radiologist

Answer

Refuse the exam and refer to MRI without gadolinium

Answer

Double the CT technique to ensure diagnostic quality

Answer

Scan without contrast to avoid fetal risk

Question 4

Which of the following best describes 'breakthrough' contrast reaction?

Accepted Answer

An allergic-like reaction occurring despite pre-medication

Answer

A delayed reaction occurring 1 hour after contrast injection

Answer

A reaction caused by extravasation at the injection site

Answer

A reaction to oral contrast rather than IV contrast

Question 5

A patient presents for CT of the chest and mentions claustrophobia. The most appropriate initial response is:

Accepted Answer

Acknowledge the concern, explain the open gantry design, and assess if additional support is needed

Answer

Cancel the exam and order an MRI instead

Answer

Immediately administer anxiolytic medication without physician order

Answer

Perform the scan as quickly as possible without addressing the concern

Question 6

What is the significance of monitoring a patient's oxygen saturation (SpO2) during CT contrast injection?

Accepted Answer

It helps detect early respiratory compromise from a contrast reaction

Answer

It confirms the IV line is patent

Answer

It measures kidney perfusion during contrast administration

Answer

It indicates the optimal scan delay time

Question 7

A patient is brought to the CT suite via stretcher and is unable to cooperate with breath-hold commands. Which strategy best reduces motion artifact in this situation?

Accepted Answer

Use the fastest available scan protocol and coordinate with nursing for sedation if appropriate

Answer

Increase the slice thickness and decrease pitch

Answer

Repeat the scan multiple times until a clear image is obtained

Answer

Switch to a low-dose protocol with no contrast