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
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 After blood has been withdrawn and the needle re-moved, direct pressure should be applied to the puncture site to prevent the formation of a he-matoma.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.
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