Intranasal Oxygen Administration

Introduction and Indications for Intranasal Oxygen Administration

Intranasal oxygen administration is a common respiratory therapy intervention used to deliver supplemental oxygen to patients who require support above room air, which contains approximately 21% oxygen. The primary device utilized for this route is the nasal cannula. Nurses initiate this therapy to treat or prevent hypoxia, a state of deficient oxygen supply to body tissues.

Clinical indications for starting intranasal oxygen include:

• Acute hypoxemia: Documented low arterial blood oxygen saturation resulting from respiratory illness, cardiac events, or trauma.
• Increased metabolic demand: States such as sepsis, severe fever, or major burns where tissue oxygen consumption rises significantly.
• Postoperative recovery: Supporting patients recovering from general anesthesia who may experience temporary hypoventilation.
• Palliative care: Relieving dyspnea and air hunger in terminally ill patients, ensuring comfort during their final stages.

Equipment and Setup for Nasal Cannula Therapy

Delivering oxygen safely requires specific medical hardware connected to a reliable gas source. In many Nigerian clinical settings, oxygen is supplied either through a centralized piped wall outlet or heavy metal compressed gas cylinders regulated by flowmeters.

1. Oxygen Source and Flowmeter: Regulates the liters per minute (LPM) of gas delivered to the patient.
2. Humidification Bottle: Filled with sterile water or freshly boiled and cooled water to add moisture to dry medical gases when flow rates exceed 4 LPM.
3. Connecting Tubing: Long, clear plastic tubing linking the humidifier bottle or flowmeter directly to the patient interface.
4. Nasal Cannula: A lightweight device featuring two short, curved prongs designed to sit inside the anterior nares.

Patient Assessment and Preparation

Before placing a nasal cannula, the nurse must evaluate the patient's baseline respiratory status and prepare them psychologically and physically. Rushing this step can lead to patient anxiety or missed airway obstructions.

Assessment priorities include checking the patency of both nostrils, inspecting the nasal mucosa for existing irritation, abrasions, or bleeding, and obtaining baseline vital signs including pulse oximetry readings. The nurse explains the procedure in simple, reassuring language to gain cooperation. Positioning the patient in a comfortable semi-Fowler's or high-Fowler's posture expands thoracic capacity and optimizes lung expansion before oxygen therapy begins.

Step-by-Step Procedure for Administration

Executing the procedure correctly ensures patient comfort and the delivery of the prescribed oxygen dose.

• Verify the order: Check the hospital chart for the exact flow rate ordered by the physician.
• Connect the equipment: Attach the cannula tubing to the oxygen source and set the prescribed flow rate.
• Position the prongs: Curve the nasal prongs downward, pointing toward the patient's nasopharynx, and insert them gently into the nostrils.
• Secure the tubing: Loop the plastic tubing over the patient's ears and adjust the slider under the chin for a snug, comfortable fit.
• Document the intervention: Record the date, time, flow rate, patient tolerance, and pre- and post-oxygenation vital signs.

Flow Rates, FiO2 Delivery, and Humidification

The nasal cannula is a low-flow oxygen delivery device. The fraction of inspired oxygen (FiO2) delivered varies depending on the patient's respiratory rate and tidal volume, because room air mixes with the supplemental oxygen as the patient breathes.

Pushing flow rates above 6 LPM through a standard nasal cannula rarely increases FiO2 meaningfully; instead, it dries and irritates the nasal mucosa severely without therapeutic benefit.

Monitoring, Maintenance, and Nursing Interventions

Continuous observation prevents complications and ensures treatment effectiveness. Nurses must check the placement of the cannula frequently, as restless patients or those sleeping can easily dislodge the device.

Key nursing responsibilities include monitoring pulse oximetry readings to track oxygen saturation trends, inspecting skin integrity over the cheekbones and behind the ears where friction from tubing can cause pressure ulcers, and performing regular nasal hygiene. Providing oral care is vital because mouth breathing caused by nasal cannulas dries the oral mucosa rapidly.

Potential Complications and Safety Precautions

Oxygen supports combustion vigorously. Open flames, smoking, and electrical sparks must be strictly prohibited in any room where oxygen is in use. Warning signs should be placed outside the ward.

Common clinical complications include:

• Mucosal drying and epistaxis: Dry gas cracks nasal blood vessels, leading to nosebleeds.
• Skin breakdown: Pressure points from tubing irritate the skin behind the ears.
• Oxygen-induced hypoventilation: Rare in most patients, but those with chronic obstructive pulmonary disease (COPD) who rely on hypoxic drive can experience reduced respiratory drive if given high oxygen concentrations.