Mosby's CT Registry
Mosby's CT Registry Review 3rd Edition
Practice Exam With 100% with Correct
Answer 2025
As related to the cardiac cycle, the term ___ refers to the relaxation of heart muscle. -
Correct Answer ✔diastole
Which of the following may be considered one of the high-osmolar contrast media
(HOCM)?
1. iothalamate meglumine
2. diatrizoate sodium
3. iohexol -Correct Answer ✔HOCM are ionic agents that dissociate into charged
particles (ions) in solution. Ionic CM are salts consisting of sodium and/or meglumine.
Iothalamate meglumine and diatrizoate sodium are commonly known by the brand
names Conray and Hypaque, respectively. Another HOCM, Gastrografin is a solution of
diatrizoate meglumine and diatrizoate sodium.
which of the following medications may be administered to a patient who is having a
severe anaphylactoid reaction to iodinated CM?
1. epinephrine
2. atropine
3. diphenhydramine -Correct Answer ✔1 and 3 only.
epinephrine (Adrenalin) is an adrenergic drug used as a bronchodilator.
Diphenhydramine (Benadryl) may be used to block the physiologic effects of the body's
release of histamine, thus reducing the allergic effect of the CM. Atropine should be
used only to combat bradycardia during a vagal reaction to CM.
The escape of contrast material from a needle or blood vessel into the subcutaneous
tissues is called: -Correct Answer ✔extravasation
aka infiltration
Thorough explanation of the CT procedure and proper communication with the pt are
vital in ensuring that:
1. breathing instructions are properly followed
2. motion artifact doesn't occur
3. pt anxiety is kept at a minimum -Correct Answer ✔1, 2, and 3
Risk factors for contrast-induced nephrotoxicity (CIN) include:
1. pheochromocytoma
2. allergy to shellfish
3. dehydration -Correct Answer ✔dehydration
Mosby's CT Registry
,Mosby's CT Registry
risk factors for CIN including preexisting renal function compromise, dehydration,
diabetes, myeloma, advanced age, and cardiovascular disease
Normal range for O2 saturation is: -Correct Answer ✔95-100%
Which of the following lab measurements can be used to evaluate the renal function of
a patient?
1. BUN
2. PTT
3. creatinine -Correct Answer ✔1 and 3 only
Which of the following would be best suited for IV injection of a contrast material with a
power injector?
a. butterfly needle
b. central venous line
c. 23-gauge spinal needle
d. angiocatheter -Correct Answer ✔angiocatheter
Angiocatheters and higher-gauge needles are preferred for administration of a contrast
agent with the use of a power injector. The stability of an angiocatheter maintains
proper placement within the vein while withstanding the high pressure applied by the
power injector.
Before the IV injection of iodinated CM, patients should be questioned regarding their:
1. renal function
2. allergic history
3. cardiac history -Correct Answer ✔1, 2, and 3
A(n) ___ infection is one that a pt acquires during a stay in a health care institution. -
Correct Answer ✔nosocomial
Nosocomial infections occur within the first 48 hrs of a pt's stay in a health care facility
Which of the following sets of values would be considered normal levels for creatinine
and blood urea nitrogen (BUN), respectively?
a. 3.1 mg/dL; 1.2 mg/dL
b. 1.2 mg/dL; 14 mg/dL
c. 0.7 mg/dL; 39 mg/dL
d. 5.2 mg/dL; 12 mg/dL -Correct Answer ✔1.2 mg/dL for creatinine; 14 mg/dL for BUN
The normal range for a creatinine level is 0.5-1.5 mg/dL. Creatinine and BUN are lab
measurements that may be used to evaluate the renal function of a pt scheduled to
undergo a CT exam that involves IV administration of an iodinated contrast agent.
Mosby's CT Registry
, Mosby's CT Registry
Which of the following sizes of butterfly needles allows for the most rapid administration
of iodinated IV CM?
a. 19 gauge
b. 21 gauge
c. 23 gauge
d. 25 gauge -Correct Answer ✔19 gauge
The choice between ionic and nonionic CM should be based on:
1. the allergic hx of the pt
2. the cost of the CM
3. the age and physical condition of the pt -Correct Answer ✔1 and 3 only
Patients may be assigned to a higher-risk group for an adverse reaction to iodinated CM
on the basis of several factors, including previous allergic history and physical condition.
Patients considered to be at high risk for adverse reactions should be administered
nonionic CM. Iso-osmolar CM is an alternative choice that may also reduce the risk of
adverse reactions.
Which of the following is an example of a mild reaction to iodinated IV CM?
a. dyspnea
b. shock
c. pulmonary edema
d. vomiting -Correct Answer ✔vomiting
mild reactions include nausea, vomiting, mild urticaria, and a warm, flushed sensation
During which of the following CT procedures is the pt required to give informed
consent?
a. noncontrast CT of the chest
b. renal stone survey
c. 3D recon of the hip
d. abdomen scan after IV CM administration -Correct Answer ✔abdomen scan after IV
CM administration
The INR is calculated to standardize which of the following lab values?
a. PT
b. PTT
c. BUN
d. GFR -Correct Answer ✔PT
because of the inherent differences in manufactured batches of tissue factor, the INR is
calculated to standardize PT results. The INR compares a pt's PT with a control sample
for a more accurate result
Which of the following infection control techniques is required at the site of an IV
injection of iodinated CM?
Mosby's CT Registry
Mosby's CT Registry Review 3rd Edition
Practice Exam With 100% with Correct
Answer 2025
As related to the cardiac cycle, the term ___ refers to the relaxation of heart muscle. -
Correct Answer ✔diastole
Which of the following may be considered one of the high-osmolar contrast media
(HOCM)?
1. iothalamate meglumine
2. diatrizoate sodium
3. iohexol -Correct Answer ✔HOCM are ionic agents that dissociate into charged
particles (ions) in solution. Ionic CM are salts consisting of sodium and/or meglumine.
Iothalamate meglumine and diatrizoate sodium are commonly known by the brand
names Conray and Hypaque, respectively. Another HOCM, Gastrografin is a solution of
diatrizoate meglumine and diatrizoate sodium.
which of the following medications may be administered to a patient who is having a
severe anaphylactoid reaction to iodinated CM?
1. epinephrine
2. atropine
3. diphenhydramine -Correct Answer ✔1 and 3 only.
epinephrine (Adrenalin) is an adrenergic drug used as a bronchodilator.
Diphenhydramine (Benadryl) may be used to block the physiologic effects of the body's
release of histamine, thus reducing the allergic effect of the CM. Atropine should be
used only to combat bradycardia during a vagal reaction to CM.
The escape of contrast material from a needle or blood vessel into the subcutaneous
tissues is called: -Correct Answer ✔extravasation
aka infiltration
Thorough explanation of the CT procedure and proper communication with the pt are
vital in ensuring that:
1. breathing instructions are properly followed
2. motion artifact doesn't occur
3. pt anxiety is kept at a minimum -Correct Answer ✔1, 2, and 3
Risk factors for contrast-induced nephrotoxicity (CIN) include:
1. pheochromocytoma
2. allergy to shellfish
3. dehydration -Correct Answer ✔dehydration
Mosby's CT Registry
,Mosby's CT Registry
risk factors for CIN including preexisting renal function compromise, dehydration,
diabetes, myeloma, advanced age, and cardiovascular disease
Normal range for O2 saturation is: -Correct Answer ✔95-100%
Which of the following lab measurements can be used to evaluate the renal function of
a patient?
1. BUN
2. PTT
3. creatinine -Correct Answer ✔1 and 3 only
Which of the following would be best suited for IV injection of a contrast material with a
power injector?
a. butterfly needle
b. central venous line
c. 23-gauge spinal needle
d. angiocatheter -Correct Answer ✔angiocatheter
Angiocatheters and higher-gauge needles are preferred for administration of a contrast
agent with the use of a power injector. The stability of an angiocatheter maintains
proper placement within the vein while withstanding the high pressure applied by the
power injector.
Before the IV injection of iodinated CM, patients should be questioned regarding their:
1. renal function
2. allergic history
3. cardiac history -Correct Answer ✔1, 2, and 3
A(n) ___ infection is one that a pt acquires during a stay in a health care institution. -
Correct Answer ✔nosocomial
Nosocomial infections occur within the first 48 hrs of a pt's stay in a health care facility
Which of the following sets of values would be considered normal levels for creatinine
and blood urea nitrogen (BUN), respectively?
a. 3.1 mg/dL; 1.2 mg/dL
b. 1.2 mg/dL; 14 mg/dL
c. 0.7 mg/dL; 39 mg/dL
d. 5.2 mg/dL; 12 mg/dL -Correct Answer ✔1.2 mg/dL for creatinine; 14 mg/dL for BUN
The normal range for a creatinine level is 0.5-1.5 mg/dL. Creatinine and BUN are lab
measurements that may be used to evaluate the renal function of a pt scheduled to
undergo a CT exam that involves IV administration of an iodinated contrast agent.
Mosby's CT Registry
, Mosby's CT Registry
Which of the following sizes of butterfly needles allows for the most rapid administration
of iodinated IV CM?
a. 19 gauge
b. 21 gauge
c. 23 gauge
d. 25 gauge -Correct Answer ✔19 gauge
The choice between ionic and nonionic CM should be based on:
1. the allergic hx of the pt
2. the cost of the CM
3. the age and physical condition of the pt -Correct Answer ✔1 and 3 only
Patients may be assigned to a higher-risk group for an adverse reaction to iodinated CM
on the basis of several factors, including previous allergic history and physical condition.
Patients considered to be at high risk for adverse reactions should be administered
nonionic CM. Iso-osmolar CM is an alternative choice that may also reduce the risk of
adverse reactions.
Which of the following is an example of a mild reaction to iodinated IV CM?
a. dyspnea
b. shock
c. pulmonary edema
d. vomiting -Correct Answer ✔vomiting
mild reactions include nausea, vomiting, mild urticaria, and a warm, flushed sensation
During which of the following CT procedures is the pt required to give informed
consent?
a. noncontrast CT of the chest
b. renal stone survey
c. 3D recon of the hip
d. abdomen scan after IV CM administration -Correct Answer ✔abdomen scan after IV
CM administration
The INR is calculated to standardize which of the following lab values?
a. PT
b. PTT
c. BUN
d. GFR -Correct Answer ✔PT
because of the inherent differences in manufactured batches of tissue factor, the INR is
calculated to standardize PT results. The INR compares a pt's PT with a control sample
for a more accurate result
Which of the following infection control techniques is required at the site of an IV
injection of iodinated CM?
Mosby's CT Registry
