A nurse needs to obtain ABG sample in a client who is on oxygen with a non-rebreather mask (NRBM). How would… - NORCET 5 mains

NORCET 5 mains

Medical & Surgical Nursing

Medium

Appeared in: NORCET 5 mains

Explanation

The primary goal of an ABG test is to assess the patient's gas exchange and acid-base status on their current prescribed oxygen therapy.
Making any changes to the oxygen delivery device or flow rate before the sample is drawn will alter the results, making them an inaccurate reflection of the patient's condition.
A patient on a non-rebreather mask (NRBM) is receiving a high concentration of oxygen (FiO₂ 60%-90%) and is likely critically ill; reducing this support is unsafe.
Standard nursing practice is to obtain the sample while the patient is on their current oxygen setting and to document the device and flow rate along with the ABG results.

Option A: Shifting to a nasal cannula would provide a much lower FiO₂ (24-44%) than an NRBM (60-90%), leading to an inaccurate ABG reading that doesn't reflect the patient's status on the prescribed therapy.
Option B: Decreasing the oxygen flow rate alters the FiO₂ being delivered by the NRBM, which would skew the ABG results and could cause hypoxemia in a patient with high oxygen demands.
Option D: This is a dangerous action. A patient on an NRBM is likely severely hypoxemic. Removing oxygen support for 30 minutes could lead to profound respiratory distress, cardiac arrest, or death.

Visual 1: Chart - Comparison of Oxygen Delivery Devices. A table showing different devices (Nasal Cannula, Simple Mask, Non-Rebreather Mask, Venturi Mask), their corresponding flow rates in L/min, and the FiO₂ percentage they deliver. This helps visualize why changing from an NRBM is a significant alteration.
Visual 2: Infographic - Steps for ABG Sampling. A simple flowchart showing the key steps: 1. Verify order, 2. Gather supplies, 3. Perform Allen's test, 4. Draw sample from artery, 5. Apply pressure, 6. Document O₂ settings with the sample.

Clinical Relevance

Nursing practice connection: Knowing Procedure for Arterial Blood Gas (ABG) Sampling on Oxygen Therapy helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
ABG results are critical for making decisions about a patient's respiratory care, such as adjusting ventilator settings, changing oxygen therapy, or initiating mechanical ventilation.
An inaccurate ABG sample, caused by improperly altering oxygen before the draw, can lead to incorrect and potentially harmful clinical decisions.
Patient Safety: Never alter a patient's prescribed oxygen therapy without a physician's order, especially for a patient on high-flow oxygen who is at high risk for decompensation.

How to Approach the Question

First, identify the core of the question: it's asking for the correct procedure for a specific diagnostic test (ABG) in a specific clinical context (patient on an NRBM).
Recall the purpose of an ABG test. Its function is to provide a snapshot of the patient's respiratory and metabolic status at a particular moment, on their current therapy.
Analyze the patient's condition implied by the equipment. A non-rebreather mask (NRBM) is a high-flow oxygen device, indicating the patient is likely critically ill and has a significant oxygen requirement.
Evaluate each option based on two principles: patient safety and test accuracy.
Eliminate options that would either endanger the patient (like removing oxygen) or invalidate the test results (like changing the oxygen settings).
The option that maintains the patient's current state and provides an accurate assessment of that state is the correct choice.

Concept Tested & Keywords

Concept Tested: Procedure for Arterial Blood Gas (ABG) Sampling on Oxygen Therapy
Stem keywords: ABG sample, non-rebreather mask, NRBM, oxygen
Lead-in keywords: How
Clinical cues: Client is on a non-rebreather mask (NRBM), which signifies a high oxygen requirement and potential for critical illness.

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