Deck 8: Arterial Blood Gas Sampling

Question 1

Arterial blood gas (ABG)analysis is used for which part of the clinical assessment?
I.Ventilation
II.Acid-base status
III.Oxygenation

A)II only
B)I and II
C)I,II,and III
D)I and III

Answer 1

I,II,and III

Question 2

Which of the following is a disadvantage of drawing blood from the radial artery?

A)The small size of the artery
B)The presence of collateral circulation
C)There are no veins or nerves immediately adjacent to the artery.
D)It is close to the surface of the skin.

Answer 2

The small size of the artery

Question 3

When an air bubble is present in a blood gas sample that was drawn on room air,what will happen to the PO₂ of the blood gas sample?

A)The PO₂ will increase.
B)The PO₂ will decrease.
C)The PO₂ will not change.

Answer 3

The PO₂ will increase.

Question 4

When performing the modified Allen's test,color should return in the hand within _____ seconds.

A)5 seconds
B)10 seconds
C)15 seconds
D)20 seconds

Question 5

Which of the following is NOT a hazard of an arterial puncture?

A)Trauma and occlusion
B)Hypoventilation
C)Infection
D)Spasm

Question 6

What is the maximum amount of time that a blood gas sample should be stored at room temperature in a plastic syringe when storing an arterial blood gas for a shunt study?

A)5 minutes
B)30 minutes
C)30 seconds
D)10 minutes

Question 7

Which artery is used to collect arterial blood during a cardiopulmonary arrest?

A)Radial artery
B)Brachial artery
C)Femoral artery
D)Ulnar artery

Question 8

If the modified Allen's test is negative on one hand what should the practitioner do at this time?

A)Hold the patient's hand above the level of the heart for 30 to 60 seconds.
B)Release the pressure on the radial artery and determine if circulation returns.
C)Perform the modified Allen's test on the other hand.
D)Perform the arterial stick anyway because of the poor perfusion.

Question 9

A neonatal patient needs an arterial blood gas drawn to justify the need for oxygen,but arterial access is not available.What should done?

A)The patient's PaO₂ should be estimated based on the patient's color.
B)A venous blood gas sample should be done and the PaO₂ calculated.
C)A capillary blood gas sample should be drawn.
D)The patient's vital signs should be assessed to justify the need for O₂.

Question 10

Why is the radial artery a commonly used site for arterial blood sampling?

A)Its location to the inside of the patient's arm
B)It is commonly used for taking a patient's pulse.
C)There is collateral circulation through the ulnar artery.
D)It is the largest artery used for arterial blood drawing.

Question 11

If the brachial artery is damaged and circulation is stopped through the brachial artery,what could possibly happen to the patient?

A)Damage to the median nerve
B)Collateral circulation could continue through the ulnar artery.
C)Loss of the arm
D)The vein could support circulation through the arm.

Question 12

Which blood gas or hemoximetry value is used to assess a patient's ventilatory status?

A)PaCO₂
B)pH
C)PaO₂
D)O₂Hb₂

Question 13

If a blood gas sample cannot be analyzed immediately and the sample is not iced,how much time can elapse before blood gas samples will start to change due to further metabolism of the blood dramatically?

A)5 minutes
B)15 minutes
C)25 minutes
D)35 minutes

Question 14

A delay of more than 30 minutes in analyzing an arterial blood gas sample,even if it is iced,would have what effect on the blood gas values?

A)Higher PO₂ ,higher PC02,lower pH
B)Lower PO₂ ,lower PC02,higher pH
C)Lower PO₂ ,higher PCO₂ ,higher pH
D)Lower PO₂ ,higher PCO₂ ,lower pH

Question 15

Which artery is located on the medial side of the antecubital fossa near the insertion of the biceps muscle at the radial tuberosity?

A)Radial artery
B)Brachial artery
C)Femoral artery
D)Dorsalis pedis

Question 16

Why should a capillary blood draw NOT be performed on infants less than 24 hours old?

A)Because of possible nerve damage
B)Increased risk of infection
C)Because fetal hemoglobin prematurely clots the blood
D)Poor peripheral perfusion

Question 17

The artery is surrounded by a layer of muscle.When an artery is punctured the artery may _________.

A)spasm.
B)form of an embolus.
C)become infected.
D)enhance circulation.

Question 18

A patient has an elevated leukocyte count.What precautions should be done for the sample?

A)The sample needs to be properly anticoagulated.
B)No special precautions need to be taken with the sample.
C)Air bubbles need to be introduced into the sample.
D)The sample needs to by immediately chilled and analyzed.

Question 19

What is the purpose of the modified Allen's test?

A)To determine the adequacy of circulation supplied by the ulnar artery
B)To determine the adequacy of circulation supplied by the brachial artery
C)To determine the adequacy of circulation supplied by the radial artery
D)To determine the adequacy of circulation supplied by the femoral artery

Question 20

When an air bubble is present in a blood gas sample that was drawn on room air,what will happen to the PCO₂ of the blood gas sample?

A)The PCO₂ will remain the same.
B)The PCO₂ will increase.
C)The PCO₂ will decrease.

Question 21

How should the practitioner ensure that the arterial line's measured blood pressure is accurate?

Question 22

Pressure should be held after arterial blood gas sampling for a minimum of _____________.

A)5 minutes.
B)1 minute.
C)20 to 30 minutes.
D)15 minutes.

Question 23

Which of the following patient considerations for arterial blood gas sampling is NOT correct?

A)It is important to assess if the patient is receiving the proper oxygen therapy before doing the puncture
B)Check the circulation proximal to the puncture site and for any bleeding at the site 20 to 30 minutes after the procedure.
C)It is important to check the patient's chart for a physician's order for anticoagulant therapy before arterial sampling.
D)A physician's order is required before performing this procedure.

Question 24

What should the practitioner teach the patient concerning an arterial line?

Question 25

What would be the main blood gas abnormality if too much sodium heparin was used in the blood gas syringe?

A)The sample would have a higher PO₂
B)The sample would have a higher PCO₂
C)The sample would have a lower pH
D)The sample would have a higher HCO₃

Question 26

What are capillary blood gas values that most closely correlate with arterial blood gas values in the newborn patient?

A)PaCO₂
B)pH
C)PaO₂
D)a and b

Question 27

Possible complications of arterial puncture at any site are vessel trauma and occlusion,embolization,infection,and vessel spasm.How could these be prevented?

Question 28

Hyperventilation may lower the patient's ___________

A)PaCO₂ .
B)anxiety.
C)pH.
D)PaO₂ .