Which of the following test should be done to check ulnar circulation of hand before performing arterial cath… - NORCET 3 - 2022 (Shift-2)

NORCET 3 - 2022 (Shift-2)

Fundamental of Nursing

Easy

Appeared in: NORCET 3 - 2022 (Shift-2)

Explanation

The Modified Allen's Test (MAT) is the standard bedside procedure to evaluate the patency of the ulnar artery.
It confirms that collateral blood flow is sufficient to supply the hand before a procedure on the radial artery, such as cannulation for an arterial line or ABG sampling.
This safety check is crucial to prevent hand ischemia (lack of blood flow) in case the radial artery becomes occluded during or after the procedure.
A normal (positive) test is indicated by the return of color to the palm within 5-15 seconds after releasing pressure on the ulnar artery.

Option A: The original Allen test is a historical predecessor and is considered less reliable than the modified version. The Modified Allen's Test is the current standard of practice for pre-cannulation assessment.
Option C: The Schick test is an intradermal test used to determine a person's susceptibility to diphtheria. It has no function in assessing vascular circulation.
Option D: The Braden Scale is a widely used assessment tool for predicting a patient's risk of developing pressure injuries or bedsores. It evaluates factors like mobility, nutrition, and moisture.

Visual 1: Diagram - A step-by-step illustration of how to perform the Modified Allen's Test, showing the points of arterial compression at the wrist and the appearance of the hand during blanching and reperfusion.
Visual 2: Anatomical Chart - A detailed view of the arterial supply to the hand, clearly labeling the radial artery, ulnar artery, and the superficial and deep palmar arches that form the collateral circulation network.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Assessment of collateral circulation of the hand before arterial cannulation as background academic context rather than a clinical decision trigger.
Performing and documenting the result of the Modified Allen's Test is a critical nursing responsibility and a non-negotiable safety standard before any radial artery puncture or cannulation.
Failure to confirm adequate collateral circulation can lead to a catastrophic ischemic injury to the hand, potentially resulting in loss of function or even amputation.
What if? - If the MAT is negative (abnormal color return greater than 15 seconds), the nurse must not proceed with the procedure on that wrist. The contralateral (other) wrist must be tested. If both are negative, the physician must be notified to consider an alternative site, such as the brachial or femoral artery.

How to Approach the Question

Step 1: Analyze the question to identify the core requirement. The question asks for a test to check 'ulnar circulation' before 'arterial catheterisation'.
Step 2: Link the keywords. Arterial catheterization is often done in the radial artery at the wrist. Checking 'ulnar circulation' implies assessing the hand's backup blood supply.
Step 3: Evaluate the options based on this context. Consider the purpose of each test presented.
Step 4: Recall or deduce that the Allen test and Modified Allen's test are related to hand circulation. Recognize that the Modified Allen's Test is the specific, standard procedure for this pre-cannulation assessment.
Step 5: Eliminate the other options by identifying their unrelated purposes: Schick test for diphtheria immunity and Braden Scale for pressure injury risk.

Concept Tested & Keywords

Concept Tested: Assessment of collateral circulation of the hand before arterial cannulation.
Stem keywords: ulnar circulation, hand, arterial catheterisation
Lead-in keywords: Which test
Negative lead-in flag: false

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