Author Question: The maximum amount of blood that should be discarded from the indwelling arterial catheter of an ... (Read 59 times)

tuffie · **on:** Jul 16, 2018

The maximum amount of blood that should be discarded from the indwelling arterial catheter of an infant is ____ mL.

a. 0.3 c. 0.8
b. 0.5 d. 1.0

Question 2

Which is the correct sequence of events when one is obtaining arterial blood from the radial ar-tery of a patient?

1. Perform the modified Allen test.
2. Remove any air bubbles from the sample.
3. Apply direct pressure to the puncture site.
4. Clean the puncture site with a suitable antiseptic solution.
5. Use a 23-gauge needle and a plastic syringe containing an anticoagulant.
a. 1, 4, 3, 5, 2 c. 1, 4, 5, 3, 2
b. 4, 1, 5, 2, 3 d. 1, 5, 2, 4, 3

frankwu0507 · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: B
The discarded volume for an infant is typically only approximately 0.2 to 0.5 mL.

Answer to Question 2

ANS: C
Collateral circulation must be ensured before the puncture by performing a modified Allen test. After the test shows sufficient collateral circulation, the site should be prepared for the puncture by cleaning with a suitable antiseptic solution. Blood samples should be obtained with a small-gauge needle (i.e., 23 to 25 gauge). After blood has been withdrawn and the needle re-moved, direct pressure should be applied to the puncture site to prevent the formation of a he-matoma. Air bubbles should then be removed because their presence can produce erroneous measurements.