The contraindications of the procedure shown in the following image is:

Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Medical Surgical Nursing

Easy

Appeared in: Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Explanation

The procedure shown is radial artery cannulation for an arterial line.
A negative (abnormal) Allen's test is a major contraindication for this procedure.
It signifies that the collateral blood supply to the hand from the ulnar artery is insufficient.
Proceeding with cannulation despite a negative test creates a significant risk of ischemic injury to the hand if the radial artery becomes occluded.

Option A: Pulse pressure variation (PPV) is a measure of fluid responsiveness, and monitoring it is a key reason to place an arterial line, not a reason to avoid it.
Option B: Hyperkalemia is an electrolyte disturbance that needs to be managed, but it does not directly affect the safety or feasibility of placing an arterial line in the wrist.
Option D: Mechanically ventilated patients are often critically ill and are prime candidates for arterial lines. The line allows for continuous blood pressure monitoring and easy access for frequent arterial blood gas (ABG) sampling.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Contraindications for Arterial Line Placement as background academic context rather than a clinical decision trigger.
Patient safety is paramount. Always perform and correctly interpret the Allen's test before radial artery cannulation to prevent devastating complications like hand ischemia, necrosis, or loss of function.
Documentation is key. The result of the Allen's test (positive or negative) must be documented in the patient's chart before the procedure is attempted.
What if? If the Allen's test is negative on one wrist, the nurse or provider should assess the other wrist. If both are negative, an alternative site for arterial cannulation, such as the femoral or brachial artery, must be considered.

How to Approach the Question

First, identify the procedure shown in the image. The location (wrist) and equipment (arterial catheter) point to radial artery cannulation.
Next, understand the question. It asks for a contraindication, meaning a reason not to perform the procedure.
Recall the specific safety checks required for radial artery cannulation. The most critical pre-procedure check is assessing collateral circulation.
Evaluate each option: 'Pulse pressure variation' and 'Ventilated patients' are common reasons to perform the procedure (indications). 'Hyperkalemia' is an unrelated medical condition.
This leaves 'Negative Allen's test'. A negative (abnormal) Allen's test directly indicates poor collateral circulation, which is the primary contraindication to prevent hand ischemia. Therefore, this is the correct answer.

Concept Tested & Keywords

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E6 Anatomy Grays 43e Vol 2 Part 2 p. 73-75

E6 Medicine Harrison 22e Part 1 p. 1903-1905