The recommended flow rate of oxygen via nasal canula?

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2018

Explanation

The standard recommended flow rate for a nasal cannula is 1–6 L/min.
This flow rate delivers an approximate fraction of inspired oxygen (FiO2) of 24% to 44%.
It is a low-flow device suitable for patients with stable respiratory patterns who require low levels of oxygen supplementation.
Flow rates above 4 L/min should be humidified to prevent drying of the nasal mucosa.

Option A: This range is too narrow and only represents the upper end of the recommended flow rate. It incorrectly excludes the common lower flow rates of 1-3 L/min used for mild hypoxemia.
Option B: This range is also incomplete. While flow rates are often kept at or below 4 L/min to avoid the need for humidification, the cannula's capacity safely extends up to 6 L/min.
Option C: This flow rate is too high for a standard nasal cannula. Rates above 6 L/min cause significant nasal mucosal drying, irritation, and are poorly tolerated.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Recommended oxygen flow rate for a nasal cannula as background academic context rather than a clinical decision trigger.
Always assess the patient's respiratory status, including rate, effort, and SpO2, before and after initiating or adjusting oxygen therapy.
Humidification is a key comfort measure and should be added for oxygen flow rates greater than 4 L/min to prevent drying of the nasal mucosa and potential nosebleeds.
Nurses must regularly check the patient's nares and the skin over the ears for signs of pressure injury or breakdown from the cannula and its tubing.

How to Approach the Question

First, identify the keywords in the question: 'nasal cannula' and 'recommended flow rate'.
This is a factual recall question that requires knowledge of standard parameters for oxygen delivery devices.
Recall the specific flow rate range for a low-flow nasal cannula used in adult patients.
Evaluate the given options. Options A and B represent partial or incomplete ranges. Option C represents a flow rate that is too high for this device.
Select the option that encompasses the complete, standard recommended range, which is 1-6 L/min.

Concept Tested & Keywords

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

E6 Nursing Fundamentals Taylor p. 731-733

Practise the full RUHS, Jaipur, PB B.Sc Nursing Entrance-2018

Attempt every question from this paper in a timed mock, then review the full solution for each one.