How much oxygen a nurse should give to a patient with chronic respiratory failure?

JIPMER Nursing Officer-2017

Medical & Surgical Nursing

Hard

Appeared in: JIPMER Nursing Officer-2017

Explanation

Patients with chronic respiratory failure (e.g., severe COPD) often have chronically elevated carbon dioxide levels (hypercapnia).
Their bodies adapt, and the primary stimulus to breathe shifts from high CO2 to low oxygen levels (hypoxia). This is known as the 'hypoxic drive'.
Administering low-flow oxygen at 1-2 L/min via nasal prongs is the standard of care to improve oxygenation without abolishing this respiratory drive.
This rate is generally effective for achieving the target oxygen saturation of 88-92% in this patient population, which is considered safe and therapeutic.

Option A: While 1 L/min is a safe low-flow rate, it may not be sufficient to raise the patient's oxygen saturation to the target therapeutic range of 88-92%.
Option C: This is a high flow rate that is dangerous for a patient with chronic respiratory failure. It can suppress the hypoxic drive, leading to hypoventilation and CO2 narcosis.
Option D: Similar to 10 L/min, this is a dangerously high flow rate that risks suppressing the respiratory drive in a patient with chronic CO2 retention.

Clinical Relevance

Nursing practice connection: Use the key finding related to Safe oxygen administration for patients with chronic respiratory failure and hypoxic drive to guide bedside assessment, documentation, and the next nursing action.
The guiding principle for oxygenating patients with known or suspected chronic CO2 retention is 'start low, go slow.' The goal is to treat hypoxemia, not to achieve a 'normal' SpO2 of 95-100%.
Nurses must vigilantly monitor for signs of impending respiratory failure from CO2 narcosis, which include confusion, drowsiness, headache, flushed skin, and a decreasing respiratory rate.
The target SpO2 for most patients with severe COPD is 88-92%. This range provides adequate oxygen delivery to tissues while minimizing the risk of suppressing the respiratory drive.

How to Approach the Question

First, identify the key patient condition in the question: 'chronic respiratory failure'.
Recall the critical pathophysiology associated with this condition, which is the potential for chronic carbon dioxide retention and reliance on a 'hypoxic drive' for breathing.
Apply the core nursing principle for this condition: Oxygen therapy must be administered cautiously at low flow rates to avoid suppressing the respiratory drive.
Evaluate the given options based on this principle. Immediately eliminate the high-flow rates (10 L/min and 12 L/min) as they are unsafe.
Choose the most appropriate option from the remaining low-flow rates (1 L/min and 2 L/min). Recognize that 1-2 L/min is the standard recommended range, and 2 L/min is a very common and appropriate starting dose.

Concept Tested & Keywords

Concept Tested: Safe oxygen administration for patients with chronic respiratory failure and hypoxic drive.
Stem keywords: chronic respiratory failure, oxygen, nurse
Lead-in keywords: How much
Clinical cues: The diagnosis of 'chronic respiratory failure' is the most important cue, as it implies potential for CO2 retention and hypoxic drive.

QEVXwQp7MyPZjdaHGZnGLo

E6 Nursing Brunner Adult Health 3SA Vol 1 Part 2 p. 38-40

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 7-9