INVASIVE BLOOD GAS ANALYSIS AND MONITORING TEST BANK Q AND A

INVASIVE BLOOD GAS ANALYSIS AND
MONITORING TEST BANK Q AND A
Invasive Blood Gas Analysis and Monitoring Test Bank Q AND
A




1. A respiratory therapist has been ordered to obtain a blood gas sample from a nonintubated
premature baby. After selecting the best site to obtain the sample, what should the RT
suggest to ameliorate the pain associated with the procedure?
a.
Administer a small dose of fentanyl
b.
Inject lidocaine at the injection site
c.
Give a pacifier dipped in 24% sucrose
d.
Administer a lidocaine drip

ANS: C
For infants more than 4 months of age and for children, anesthetic cream or a lidocaine
injection may be used to control the pain felt during a blood gas procedure. For nonintubated
infants and premature newborns, a pacifier dipped in 24% sucrose is effective in helping to
ameliorate the effects of pain.


REF: p. 115


2. Which of the following arteries is considered the optimal puncture site for obtaining arterial
blood samples from neonatal and pediatric patients?

, INVASIVE BLOOD GAS ANALYSIS AND
MONITORING TEST BANK Q AND A
a.
Radial artery
b.
Axillary artery
c.
Ulnar artery
d.
Popliteal artery

ANS: A

, INVASIVE BLOOD GAS ANALYSIS AND
MONITORING TEST BANK Q AND A
The preferred site in both neonatal and pediatric populations is the radial artery. The radial
artery provides good access as well as collateral circulation to the hand by the ulnar artery. No
nerves or veins are directly adjacent to the radial artery, and the patient’s wrist is easier to
manipulate than other body parts. The bone and firm ligaments of the wrist make it easy to
palpate, stabilize, and compress the radial artery.


REF: pp. 115-116


3. If a blood gas sample is not obtained from an arterial stick in a premature baby without central
access, which of the following sites should be considered because this blood vessel is larger
than the radial artery at this age?
a.
Dorsalis pedis
b.
Temporal
c.
Posterior tibial
d.
Femoral

ANS: B
The dorsalis pedis or posterior tibial artery is considered if the radial artery shows signs of
poor collateral circulation. In addition, the temporal artery provides an alternative site for the
premature or newborn infant. Access is generally good because two branches are close to the
scalp. In most premature and neonatal patients, the temporal artery branches are larger than
the radial artery.


REF: p. 116


4. In addition to the dorsalis pedis, which of the following arteries is involved when the modified
Allen’s test is performed using a foot as the potential arterial puncture site?
a.
Axillary artery
b.
Femoral artery
c.
Posterior tibial artery
d.
Dorsalis pedis

ANS: C
The modified Allen’s test can also be used to verify collateral circulation when using one of