Why humidification is important when patient is on oxygen therapy?

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2015

Medical Surgical Nursing

Medium

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2015

Explanation

Oxygen from a tank or wall outlet is 100% dry, which can dehydrate the respiratory mucous membranes.
The primary purpose of humidification is to add moisture to the inspired oxygen, specifically to prevent the drying, irritation, and potential bleeding of the nasal mucosa.
This action maintains the natural function of the airways, improves patient comfort, and reduces the risk of complications like inflammation or infection.
Humidification is typically required for oxygen flow rates greater than 4 L/min, as lower flows are usually sufficiently humidified by the upper airway itself.

Option B: While oxygen therapy can contribute to a dry mouth, especially if the patient breathes through their mouth, this is considered a secondary issue. The primary and most direct impact of the dry gas is on the nasal mucosa where the oxygen is delivered.
Option C: The oxygen itself is what helps the patient breathe by increasing the oxygen saturation in the blood. Humidification does not assist with the physiological act of breathing (gas exchange) but makes the therapy more tolerable.
Option D: Helping the patient be at ease is a positive outcome of humidification, but it is not the primary physiological reason for the intervention. The 'ease' comes from preventing the physical discomfort and irritation of dry nasal passages.

Clinical Relevance

Nursing practice connection: Use the key finding related to Rationale for Humidification in Oxygen Therapy to guide bedside assessment, documentation, and the next nursing action.
A key nursing responsibility is to ensure the humidifier is functioning correctly, filled with sterile water to the appropriate level, and changed according to hospital policy to prevent bacterial growth.
Nurses must assess the patient's nares for signs of dryness, irritation, or bleeding, even at low flow rates, as individual tolerance varies.
What if? If a patient on 2 L/min of oxygen via nasal cannula complains of significant nasal dryness and discomfort, the nurse should not dismiss it. Although humidification is not standard at this flow rate, it can be added to improve patient comfort and prevent complications.

How to Approach the Question

First, understand the question is asking for the primary reason for a specific intervention (humidification) within a therapy (oxygen).
Analyze the properties of medical oxygen: it is a dry gas.
Consider the physiological effect of inhaling a dry gas directly into the nasal passages, the first point of contact.
Evaluate the options: 'Drying of nasal mucosa' directly addresses the consequence of inhaling dry gas.
Differentiate this primary reason from secondary benefits ('help patient be at ease') or effects on other areas ('drying of mouth').
Eliminate options that describe the goal of the overall therapy (oxygen helps breathing) rather than the specific intervention (humidification).

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor pp. 729-731, 724-726