The most relevant knowledge about oxygen administration to a patient with COPD includes?

AIIMS Bhatinda NO - 2019

Medical & Surgical Nursing

Hard

Appeared in: AIIMS Bhatinda NO - 2019

Explanation

In a subset of patients with chronic COPD and CO2 retention, the primary stimulus for breathing is low oxygen levels (hypoxic drive), not high CO2 levels.
Administering high concentrations of oxygen can suppress this drive, leading to hypoventilation, increased CO2 retention (hypercapnia), and respiratory failure.
Therefore, the safest approach is to provide low-flow oxygen at 1-2 L/min, typically via a nasal cannula, to maintain adequate oxygenation (target SpO2 88-92%) without abolishing the respiratory stimulus.

Option B: A flow rate of 5-6 L/min delivers a moderate-to-high concentration of oxygen that can suppress the hypoxic drive in susceptible COPD patients, leading to CO2 retention.
Option C: A non-rebreathing mask delivers a very high fraction of inspired oxygen (FiO2 of 60-90%), which is contraindicated for routine management of stable COPD due to the high risk of suppressing the respiratory drive.
Option D: This statement is factually incorrect. A pulse oximeter measures peripheral oxygen saturation (SpO2), not blood gases. Arterial Blood Gas (ABG) analysis is the gold standard for measuring blood gases, including PaO2, PaCO2, and pH.

Clinical Relevance

Nursing practice connection: Use the key finding related to Principles of safe oxygen administration in patients with Chronic Obstructive Pulmonary Disease (COPD), focusing on the hypoxic drive theory to guide bedside assessment, documentation, and the next nursing action.
The guiding principle for nurses is 'start low and go slow.' The goal for most COPD patients is an oxygen saturation of 88-92%, not 100%, to prevent complications.
Nurses must vigilantly assess for signs of CO2 narcosis when a COPD patient is on oxygen: drowsiness, confusion, headache, shallow breathing, and a falling respiratory rate. These are red flags requiring immediate intervention.
What if? If a COPD patient requires more oxygen than 1-2 L/min can provide to maintain saturation at 88-92%, the next best step is to switch to a Venturi mask. This device allows for the delivery of a precise, controlled FiO2 (e.g., 24%, 28%) to improve oxygenation without the risk of over-oxygenating the patient.

How to Approach the Question

First, identify the core concept: oxygen therapy in a patient with COPD. This should immediately trigger your knowledge about the risks of hyperoxia in this population.
Recall the key physiological principle associated with oxygen and COPD: the 'hypoxic drive'. This is the concept that in some long-term COPD patients, low oxygen, not high CO2, stimulates breathing.
Evaluate each option against this safety principle. The goal is to provide enough oxygen to prevent severe hypoxia but not so much that it stops the patient's drive to breathe.
Option A suggests a low flow rate (1-2 L/min) specifically to maintain the hypoxic stimulus. This aligns perfectly with the safety principle.
Options B (high flow rate) and C (high-concentration mask) directly contradict this principle and are therefore dangerous and incorrect.
Option D contains a factual error in equipment function (pulse oximeter vs. ABG), making it incorrect. Eliminate it based on knowledge of medical devices.

Concept Tested & Keywords

Concept Tested: Principles of safe oxygen administration in patients with Chronic Obstructive Pulmonary Disease (COPD), focusing on the hypoxic drive theory.
Stem keywords: COPD, oxygen administration, relevant knowledge
Lead-in keywords: most relevant
Negative lead-in flag: false

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