During the Allen test, what initial action is performed?

Study for the Interventional Radiology Registry Exam. Utilize flashcards and multiple choice questions; each question offers hints and explanations. Prepare thoroughly for your success!

In the Allen test, the initial action performed is to occlude both the radial and ulnar arteries. This is a crucial step that allows for the assessment of the blood supply to the hand and helps to determine the patency of the ulnar artery.

By occluding both arteries, the physician can temporarily restrict blood flow to the hand. The patient is typically asked to make a fist, which helps to further empty the hand of blood. After a short period, the pressure on the ulnar artery is released while the radial artery remains occluded. This allows for observation of the hand's color and refill time, indicating how well the ulnar artery can supply blood to the hand on its own.

This test is important in clinical practice, especially prior to procedures like radial artery catheterization, as it helps ensure that the ulnar artery is a viable source of blood flow to the hand. The assessment of collateral circulation (in this case, the ability of the ulnar artery to supply blood) is vital for patient safety and successful intervention.

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