You are asked to perform a radial artery puncture on an unconscious patient. How can you confirm the presence of collateral circulation?
I.Use a Doppler transducer to assess thumb blood flow with radial obstruction.
II.Use a pulse oximeter to assess thumb blood flow with ulnar obstruction.
III.Use a pulse oximeter to assess thumb blood flow with radial obstruction.

Question

Quizplus · Accepted Answer

I and III are correct because both involve assessing thumb blood flow with radial artery obstruction, which is relevant for confirming collateral circulation through the ulnar artery. Using a Doppler transducer (I) or a pulse oximeter (III) can help ensure that there is adequate blood flow to the hand if the radial artery is compromised, indicating effective collateral circulation. Option II is incorrect because it suggests assessing thumb blood flow with ulnar obstruction, which is not relevant for a radial artery puncture.

You Are Asked to Perform a Radial Artery Puncture on an Unconscious