The administration of oxygen is a vital component of first aid response in workplace settings. Supplemental oxygen therapy can be life-saving during respiratory emergencies, where patients experience distress due to inadequate oxygen levels in their blood.
When a person’s arterial oxygen levels fall below normal range, supplemental oxygen becomes necessary to prevent tissue damage and organ dysfunction. The delivery of appropriate oxygen concentrations through the correct oxygen delivery system can significantly improve patient outcomes during emergencies.
This guide addresses selection, placement, and calculation of various oxygen administration techniques suitable for workplace settings, with specific focus on safety considerations, equipment requirements, and monitoring protocols.
Oxygen Delivery Devices
When it comes to workplace first aid, having the right oxygen delivery devices on hand is crucial for managing respiratory emergencies. Low-flow systems like nasal cannulae and simple face masks are suitable for stable patients with mild hypoxia or chronic lung conditions. They’re comfortable and easy to use, making them ideal for workplace settings.
Oxygen Masks
Oxygen masks are essential devices for the provision of supplemental oxygen therapy in workplace settings. Several types of masks deliver different oxygen concentrations to meet specific clinical needs:
- Simple Face Masks: These masks deliver oxygen concentrations of 35-60% when the flow rate is set between 5-10 L/min. The actual concentration varies based on the patient’s ventilation pattern. Simple masks are appropriate for many emergency situations requiring moderate oxygen therapy.
- Non-Rebreather Masks: Featuring a reservoir bag and one-way valves, these masks deliver high oxygen concentrations (60-90%) at flow rates of 10-15 L/min. They are the preferred method of oxygen delivery in scenarios with high oxygen requirements, such as severe trauma or cardiac emergencies. Proper placement is crucial to ensure effective therapy.
- Venturi Masks: These specialised masks provide precise control of inspired oxygen concentration through specifically designed ports. They’re particularly valuable for oxygen therapy in COPD patients, where liberal versus conservative oxygen therapy approaches must be carefully considered. Venturi masks allow for specific target oxygen saturation ranges to be maintained.
- Partial Rebreather Masks: Similar to non-rebreather masks but without all the one-way valves, these deliver oxygen concentrations of 40-70% and are less commonly used in first aid settings.
Nasal Cannulae
Nasal cannulae provide a comfortable method for delivering supplemental oxygen therapy for patients with mild to moderate requirements. Key features include:
- Oxygen Delivery Capability: Nasal cannulae deliver oxygen concentrations of 24-44% at flow rates of 1-6 L/min. This range of oxygen delivery makes them suitable for patients whose oxygen saturations improve with minimal supplementation.
- Advantages: This oxygen delivery system allows patients to eat, drink, and communicate while receiving therapy. For short burst oxygen therapy needs or situations where oxygen therapy may be facilitated over extended periods, cannulae offer superior comfort and practicality.
- Limitations: Cannulae cannot provide high inspired oxygen concentrations and are therefore not suitable for patients with high oxygen requirements or severe respiratory distress.
- Proper Placement: Correct positioning involves inserting the prongs into the nostrils with the curved sections pointing downward, securing the tubing over the ears, and adjusting the slider under the chin for comfort.
Bag-Valve-Mask (BVM) Devices
The bag-valve-mask (BVM) represents a critical component in emergency oxygen delivery systems for workplace first aid situations:
- Components and Function: A BVM consists of a self-inflating bag, one-way valve system, face mask, and oxygen reservoir attachment. When connected to an oxygen cylinder, this device can deliver high concentrations of oxygen (up to 100% with proper technique).
- Application: BVMs are used when patients require ventilation assistance along with high-concentration oxygen therapy. The use of oxygen over room air via BVM devices significantly improves outcomes in cardiac arrest and severe respiratory compromise.
- Technique: Proper BVM use requires training and often two rescuers—one maintaining a tight mask seal while the other squeezes the bag at approximately 10-12 breaths per minute for adults. Adequate oxygen delivery depends on proper technique and sufficient flow rates from the oxygen source.
- Safety Considerations: Inappropriate ventilation rates or volumes can cause barotrauma or stomach distension. Additionally, increased reactive oxygen species generation is a theoretical concern with prolonged high-concentration oxygen exposure, though this is rarely relevant in emergency settings.
Indications for Oxygen Therapy
It’s important to recognise the key situations where oxygen therapy may be necessary. These include acute emergencies such as severe asthma, trauma or sepsis, as well as any condition resulting in low blood oxygen levels (hypoxaemia).
Asthma and Chronic Conditions
Oxygen therapy in chronic obstructive pulmonary disease (COPD) and asthma requires special consideration in workplace first aid settings:
- Asthma Exacerbations: During severe asthma attacks, patients typically experience significant respiratory distress and may develop hypoxaemia. High-flow oxygen (10-15 L/min via non-rebreather mask) is generally appropriate for these patients, as the risk of hypercapnia is low compared to COPD patients.
- COPD Management: For therapy in patients with chronic obstructive pulmonary disease, a more cautious approach is needed. High oxygen concentrations can suppress the hypoxic respiratory drive in some COPD patients, potentially leading to carbon dioxide retention. The provision of a COPD oxygen delivery protocol using Venturi masks to deliver controlled oxygen concentrations (24-28%) is recommended.
- Monitoring Requirements: Oxygen therapy in COPD patients requires careful monitoring of respiratory rate, effort, and when possible, oxygen saturation measured by pulse oximetry. If available, capnography provides valuable information about ventilation status and carbon dioxide levels.
- Titration Approach: Oxygen therapy should be titrated to maintain saturations in the 88-92% range for known COPD patients, rather than the higher targets used for other conditions. Therapy titrated to this target range minimizes the risk of oxygen-induced hypercapnia while preventing tissue hypoxia.
Trauma & Sepsis
Trauma and sepsis represent critical conditions requiring prompt oxygen administration in workplace settings:
Trauma Cases:
- Major Injuries: Severe trauma often leads to increased metabolic demands and potential compromise of oxygen delivery systems in the body. High-flow oxygen via non-rebreather mask should be administered to achieve high oxygen saturation (>94%) in these patients.
- Head Trauma: Brain tissue is particularly sensitive to hypoxia. Liberal versus conservative oxygen therapy approaches generally favour higher oxygen concentrations for head injuries to prevent secondary brain injury, though therapy should be titrated based on oxygen saturation readings.
- Chest Injuries: Thoracic trauma may directly impair ventilation and oxygenation. Deliver oxygen at high concentrations while monitoring closely for signs of pneumothorax or haemothorax that may require additional interventions.
Sepsis Considerations:
- Recognition: Early signs of sepsis include fever or hypothermia, tachypnoea, altered mental status, and hypotension. These patients often have increased oxygen requirements due to inflammatory responses and potential ventilation-perfusion mismatching.
- Oxygen Therapy Approach: High-concentration oxygen delivery via non-rebreather mask is indicated initially, with subsequent titration based on saturation readings. Oxygen therapy in critically ill septic patients has been demonstrated to improve outcomes when appropriately managed.
- Monitoring Priorities: Continuous assessment of vital signs, including oxygen saturation, is essential as septic patients can deteriorate rapidly despite supplemental oxygen therapy.
Hypoxemic Patients
Hypoxaemia (low arterial oxygen levels) represents a primary indication for supplemental oxygen therapy in workplace first aid:
- Recognition Signs: Key indicators of hypoxaemia include:
- Tachypnoea (rapid breathing)
- Dyspnoea (shortness of breath)
- Cyanosis (bluish discoloration of skin, lips, or nail beds)
- Confusion or altered mental status
- Oxygen saturation below 94% on pulse oximetry
- Common Workplace Causes:
- Respiratory infections
- Cardiac events
- Pulmonary embolism
- Inhalation injuries
- Anaphylaxis
- Acute anxiety with hyperventilation
- Administration Guidelines:
- For mild hypoxaemia (SpO₂ 90-94%): Oxygen can be delivered via nasal cannula at 1-4 L/min
- For moderate hypoxaemia (SpO₂ 85-89%): Use simple mask at 5-10 L/min
- For severe hypoxaemia (SpO₂ <85%): High-flow oxygen via non-rebreather mask at 10-15 L/min
- Special Considerations:
- Patients whose oxygen saturations improve with oxygen therapy to above the target range may have their concentration reduced gradually
- For patients with known risk of hypercapnic respiratory failure, consider lower target saturations (88-92%)
- If hypoxaemia persists despite high-flow oxygen, consider possible airway obstruction or tension pneumothorax
Oxygen Administration Technique
Proper administration technique ensures effective oxygen therapy while minimizing risks. The following steps outline best practices for workplace oxygen administration:
Pre-Administration Assessment
- Patient Evaluation:
- Assess level of consciousness and respiratory distress
- Measure baseline vital signs, including respiratory rate and effort
- Check for signs of cyanosis or poor peripheral perfusion
- Determine oxygen saturation using pulse oximetry if available
- History Gathering:
- Quickly determine if the patient has any contraindication to high-concentration oxygen (primarily COPD with CO₂ retention)
- Ask about pre-existing conditions and current symptoms
- Review any available medical alert information
- Equipment Preparation:
- Check oxygen cylinder pressure gauge to ensure adequate supply
- Verify all components of the oxygen delivery system are functional
- Select appropriate delivery device based on assessment findings
Administration Procedure
- Setting Up the Equipment:
- Open the cylinder valve slowly and completely
- Adjust the flowmeter to the appropriate rate for the selected delivery device
- Connect the delivery device to the oxygen tubing
- For non-rebreather masks, pre-fill the reservoir bag before application
- Device Application:
- Position the selected device properly (mask over nose and mouth, cannula prongs in nostrils)
- Secure the device comfortably but snugly to ensure proper placement
- Adjust oxygen flow rate according to the device requirements and patient needs
- Ensure adequate oxygen is flowing through the system
- Patient Positioning:
- Position the patient upright if conscious and not contraindicated
- Ensure airway remains patent and visible
- Make adjustments to maintain comfort while optimizing ventilation
- Flow Rate Guidelines:
- Nasal cannula: 1-6 L/min (provides 24-44% oxygen)
- Simple mask: 5-10 L/min (provides 35-60% oxygen)
- Non-rebreather mask: 10-15 L/min (provides 60-90% oxygen)
- Venturi mask: As specified on colour-coded adapters (24-60% oxygen)
Monitoring and Adjustment
- Continuous Assessment:
- Regularly check oxygen saturation via pulse oximetry
- Monitor respiratory rate, effort, and patient comfort
- Observe for signs of improvement or deterioration
- Watch for complications such as mask discomfort or nasal dryness
- Titration Principles:
- Aim for target saturation of 94-98% for most patients
- For COPD patients, target 88-92% to avoid CO₂ retention
- Adjust flow rates incrementally based on saturation readings
- Consider changing delivery device if unable to achieve targets
- Duration Considerations:
- Calculate available oxygen supply duration based on cylinder size and flow rate
- Plan for cylinder replacement if extended therapy is anticipated
- Document start time, flow rates, and cylinder pressure readings
- Complications Management:
- Address mask discomfort by adjusting fit or considering alternative devices
- Provide humidification for extended therapy to prevent mucosal drying
- Watch for signs of oxygen toxicity with prolonged high-concentration therapy (rare in emergency settings)
- Monitor for increased work of breathing despite oxygen therapy, which may indicate worsening condition
In all cases, administration of oxygen should be considered a temporary measure while awaiting definitive medical care. Emergency medical services should be activated promptly for any patient requiring supplemental oxygen.
FAQs
Should I give oxygen to everyone in an emergency?
No. Only give oxygen to people showing signs of breathing difficulty, like shortness of breath, rapid breathing, confusion, or bluish lips. For most people, aim for oxygen readings of 94-98% on the pulse oximeter. For people with known lung conditions like COPD, a lower range of 88-92% is safer.
How do I know which oxygen mask to use and how much oxygen to give?
For mild breathing problems, use the nasal prongs (cannula) with 1-4 litres per minute. For moderate problems, use a simple face mask with 5-10 litres per minute. For severe breathing emergencies, use the mask with the reservoir bag (non-rebreather) with 10-15 litres per minute. People with COPD need special Venturi masks. Always adjust based on how the person responds.
What are the main safety rules when using oxygen?
Never allow smoking or flames near oxygen. Keep oxygen cylinders secured upright so they can’t fall over. Keep cylinders away from heat and make sure hands and equipment are free of oil or grease. Check cylinder pressure regularly to ensure you won’t run out. Record when you start and stop giving oxygen, and at what flow rate. Have spare equipment ready if possible.
