Medical Oxygen Nippon Gases Scandinavia

What Is Medical Oxygen and What Is It Used For?

Medical oxygen is a pharmaceutical-grade gas containing at least 99.5% pure oxygen (O₂), used to treat hypoxemia — abnormally low levels of oxygen in the blood. It is administered by inhalation and is essential in emergency medicine, intensive care, anesthesia, and long-term home oxygen therapy for chronic respiratory diseases.

Oxygen is the most fundamental requirement for human cellular metabolism. Every cell in the body depends on a continuous supply of oxygen to produce energy through aerobic respiration. When the body's oxygen supply is compromised — whether due to lung disease, heart failure, anemia, trauma, or other conditions — supplemental medical oxygen becomes a life-saving intervention.

Medical Oxygen Nippon Gases Scandinavia is produced to strict pharmaceutical standards and meets the requirements of the European Pharmacopoeia (Ph. Eur.). Unlike industrial-grade oxygen, which may contain trace contaminants, medical oxygen undergoes rigorous quality control to ensure purity and safety for human inhalation. The gas is supplied in high-pressure cylinders (typically at 200 bar) or via liquid oxygen systems for larger installations such as hospitals.

The therapeutic use of oxygen dates back to the late 18th century, but its role as a regulated medicine was formally established in the 20th century. Today, the World Health Organization (WHO) lists medical oxygen on its Model List of Essential Medicines, recognizing it as one of the most important drugs in healthcare. Global demand for medical oxygen increased dramatically during the COVID-19 pandemic, highlighting its critical importance in respiratory care.

Indications for medical oxygen therapy

Medical oxygen is indicated for a wide range of clinical conditions where blood oxygen levels are, or are at risk of becoming, inadequately low. The British Thoracic Society (BTS) guidelines and international consensus define the following key indications:

• Acute respiratory failure: Including pneumonia, acute respiratory distress syndrome (ARDS), pulmonary embolism, and severe asthma exacerbations
• Chronic obstructive pulmonary disease (COPD): During acute exacerbations and as long-term oxygen therapy (LTOT) in patients with chronic hypoxemia
• Heart failure: When associated with pulmonary edema and hypoxemia
• Carbon monoxide poisoning: High-flow 100% oxygen to displace carbon monoxide from hemoglobin
• Cluster headaches: High-flow oxygen (12-15 L/min) as an abortive treatment
• Perioperative use: During general anesthesia and postoperative recovery
• Trauma and shock: To maintain tissue oxygenation during resuscitation
• Decompression sickness: Emergency oxygen as a bridge to hyperbaric therapy
• Neonatal care: For premature infants with respiratory distress syndrome, with careful monitoring to prevent retinopathy of prematurity

How does medical oxygen work?

Medical oxygen works by increasing the fraction of inspired oxygen (FiO₂) above the 21% found in ambient air. When a patient inhales supplemental oxygen, the increased partial pressure of oxygen in the alveoli drives greater oxygen diffusion across the alveolar-capillary membrane into the blood. This raises the arterial partial pressure of oxygen (PaO₂) and increases hemoglobin oxygen saturation (SpO₂), improving oxygen delivery to tissues throughout the body.

At the cellular level, adequate oxygen supply ensures that mitochondria can carry out oxidative phosphorylation efficiently, the primary metabolic pathway for energy (ATP) production. When oxygen is insufficient (hypoxia), cells switch to anaerobic metabolism, which is far less efficient and produces lactic acid as a byproduct, leading to metabolic acidosis and, if prolonged, irreversible cell damage and organ failure.

What Should You Know Before Using Medical Oxygen?

Before starting oxygen therapy, patients should be assessed for the underlying cause of hypoxemia. In patients with chronic hypercapnic respiratory failure (such as severe COPD), oxygen must be administered cautiously with target saturations of 88-92% to avoid suppressing respiratory drive. Oxygen supports combustion, so all ignition sources must be eliminated.

Medical oxygen is generally a safe and well-tolerated treatment when used appropriately. However, as with all medicines, there are important precautions and contraindications to be aware of. Proper assessment before initiating oxygen therapy ensures that patients receive the correct flow rate and delivery method for their specific clinical situation.

Contraindications

There are no absolute contraindications to supplemental oxygen in the presence of documented hypoxemia. However, the following situations require special caution:

• Paraquat poisoning: Supplemental oxygen may worsen pulmonary damage in paraquat intoxication and should be avoided unless severe hypoxemia is present
• Bleomycin-treated patients: High-concentration oxygen may increase the risk of bleomycin-induced pulmonary toxicity, particularly perioperatively
• Premature neonates: Uncontrolled oxygen delivery poses a risk of retinopathy of prematurity (ROP); careful SpO₂ monitoring with target ranges of 91-95% is essential

Warnings and precautions

Several important warnings apply to medical oxygen therapy:

• Hypercapnic respiratory failure: In patients with chronic CO₂ retention (commonly in severe COPD, neuromuscular disease, or morbid obesity), excessive oxygen can suppress the hypoxic ventilatory drive, leading to worsening hypercapnia, respiratory acidosis, and potentially respiratory arrest. These patients should be treated with controlled oxygen aiming for SpO₂ 88-92%
• Fire hazard: Oxygen-enriched atmospheres dramatically increase the risk and intensity of fire. Oil, grease, and petroleum-based products must never be used on oxygen equipment. Patients on home oxygen must not smoke and should maintain a minimum distance of 2 meters from open flames
• Cylinder safety: Compressed gas cylinders are stored at pressures up to 200 bar. They must be properly secured, handled with care to prevent falls, and regulators must be compatible with medical oxygen systems
• Monitoring requirement: Pulse oximetry (SpO₂) should be used to guide therapy. In critically ill patients, arterial blood gas (ABG) analysis provides more comprehensive information including PaO₂, PaCO₂, pH, and lactate

Pregnancy and breastfeeding

Medical oxygen can be used safely during pregnancy when clinically indicated. Maintaining adequate maternal oxygenation is essential for fetal wellbeing, as the fetus depends entirely on maternal blood oxygen supply. Hypoxemia during pregnancy can lead to fetal distress and adverse outcomes. Oxygen therapy during labor and delivery should be guided by maternal SpO₂ monitoring. There are no restrictions on oxygen therapy during breastfeeding.

How Does Medical Oxygen Interact with Other Drugs?

Medical oxygen has relatively few direct pharmacological drug interactions. The most clinically significant interactions involve drugs that increase the risk of pulmonary toxicity when combined with high-concentration oxygen, including bleomycin, amiodarone, and nitrofurantoin. In patients receiving these medications, oxygen should be administered at the lowest effective concentration.

Unlike most conventional medicines, medical oxygen does not undergo hepatic metabolism and does not interact with cytochrome P450 enzymes. Its interactions are primarily related to additive pulmonary toxicity with certain drugs and physiological effects on gas exchange. Understanding these interactions is important for safe prescribing, particularly in intensive care and perioperative settings.

Major interactions

Minor interactions

Some additional interactions are of lower clinical significance but worth noting:

• Opioids and sedatives: While not a direct interaction with oxygen itself, these drugs cause respiratory depression and may necessitate supplemental oxygen. However, in COPD patients, the combination of sedation and oxygen without monitoring can be dangerous
• Carbogen (CO₂/O₂ mixtures): When carbon dioxide is administered therapeutically alongside oxygen, the respiratory stimulant effect of CO₂ can alter oxygen uptake patterns
• Volatile anesthetic agents: These are routinely administered with oxygen as the carrier gas; the FiO₂ is an integral part of anesthetic management

What Is the Correct Dosage of Medical Oxygen?

Medical oxygen dosage is measured in liters per minute (L/min) and adjusted to achieve target oxygen saturations: 94-98% for most patients, and 88-92% for those at risk of hypercapnic respiratory failure. The delivery device determines the achievable FiO₂, ranging from 24% with low-flow nasal cannulae to nearly 100% with non-rebreather masks or mechanical ventilation.

Unlike most pharmaceuticals, medical oxygen is titrated to a measured physiological target (SpO₂) rather than given in fixed doses. The British Thoracic Society (BTS) guidelines, the Global Initiative for Chronic Obstructive Lung Disease (GOLD), and other international guidelines all emphasize the importance of prescribing oxygen with a target saturation range and selecting an appropriate delivery device.

Adults

Children

Oxygen therapy in children follows the same principles as in adults but with age-appropriate equipment and flow rates. Pediatric considerations include:

• Infants: Low-flow nasal cannulae at 0.5-2 L/min are typically sufficient; head boxes or incubators may be used in neonatal settings
• Children (1-12 years): Nasal cannulae at 1-4 L/min or pediatric face masks at 5-8 L/min
• Adolescents: Adult devices and flow rates are generally appropriate
• Target SpO₂: 94-98% for most pediatric patients; 91-95% for premature neonates to minimize the risk of retinopathy of prematurity

The WHO recommends that in resource-limited settings, children with severe pneumonia who present with central cyanosis, inability to drink, or severe respiratory distress should receive oxygen therapy. Pulse oximetry is recommended for all children receiving oxygen to guide therapy and prevent complications from both hypoxemia and hyperoxia.

Elderly

Elderly patients may have a higher prevalence of chronic lung disease and are more likely to be at risk of hypercapnic respiratory failure. In older patients:

• Assess for COPD and other causes of chronic CO₂ retention before initiating oxygen
• Start with controlled oxygen (e.g. 28% Venturi mask) if risk of hypercapnia is suspected
• Monitor closely with pulse oximetry and arterial blood gases as needed
• Consider that age-related changes in lung compliance and gas exchange may affect oxygen requirements

Missed dose

The concept of a "missed dose" does not apply to medical oxygen in the same way as it does to conventional medications. For patients on long-term oxygen therapy (LTOT), the treatment is typically prescribed for a minimum of 15 hours per day (ideally including sleep). If a period of oxygen use is missed:

• Resume oxygen therapy as soon as possible
• Do not attempt to "catch up" by using higher flow rates
• If symptoms of hypoxemia develop (breathlessness, confusion, cyanosis), restart oxygen and seek medical attention if symptoms are severe

Overdose

Oxygen "overdose" — or hyperoxia — occurs when patients receive more oxygen than needed, resulting in supraphysiological blood oxygen levels. The consequences depend on the duration and degree of exposure:

• Short-term high FiO₂ (<24 hours): Generally well-tolerated in most patients, though absorption atelectasis can develop
• Prolonged high FiO₂ (>24-48 hours at >60%): Risk of tracheobronchitis, diffuse alveolar damage, and pulmonary fibrosis
• Hypercapnic patients: Even modest over-oxygenation can trigger CO₂ narcosis, coma, and respiratory arrest

Management of oxygen toxicity involves reducing the FiO₂ to the lowest level that maintains target SpO₂, supportive care, and addressing the underlying condition. There is no specific antidote for oxygen toxicity.

What Are the Side Effects of Medical Oxygen?

Common side effects of oxygen therapy include nasal dryness, nosebleeds, and skin irritation from delivery devices. Prolonged exposure to high concentrations can cause serious effects including absorption atelectasis, tracheobronchitis, and pulmonary oxygen toxicity. In susceptible patients, oxygen can suppress respiratory drive, leading to carbon dioxide retention.

While oxygen is essential for life, supplemental oxygen at concentrations above those in ambient air can cause adverse effects. The risk and severity of side effects depend on the concentration of oxygen delivered, the duration of exposure, and patient-specific factors. Most mild side effects are easily managed, while serious toxicity is largely preventable through appropriate prescribing and monitoring.

How Should You Store Medical Oxygen?

Medical oxygen cylinders must be stored upright in well-ventilated areas, away from heat sources, flammable materials, and direct sunlight. Cylinders should be kept at temperatures below 50°C and secured to prevent falling. Empty and full cylinders should be stored separately. Never use oil or grease on cylinder valves or regulators.

Safe storage of medical oxygen is a critical safety requirement, both in healthcare facilities and in patients' homes. Improper storage can lead to fire hazards, equipment failure, or degradation of gas quality. The following guidelines are based on international standards including the European Industrial Gases Association (EIGA) and national fire safety regulations.

Storage guidelines

• Temperature: Store cylinders at temperatures below 50°C (122°F). Avoid exposure to direct sunlight, radiators, or other heat sources
• Ventilation: Store in well-ventilated areas. Oxygen leaks can create an oxygen-enriched atmosphere, increasing fire risk
• Position: Store cylinders upright and secured with straps, chains, or in purpose-built racks to prevent them from falling
• Separation: Keep oxygen cylinders away from flammable gases (such as acetylene or propane), combustible materials, and chemical storage areas. Maintain a minimum distance of 5 meters or use a fire-resistant barrier
• Segregation of full and empty: Clearly label and separate full and empty cylinders to ensure efficient stock management and prevent use of empty cylinders in emergencies
• No contaminants: Never allow oil, grease, petroleum-based lubricants, or organic solvents to come into contact with oxygen equipment. These substances can ignite spontaneously in the presence of high-pressure oxygen
• Cylinder valves: Keep cylinder valves closed when not in use. Protect valve outlets with dust caps during storage and transport

Home oxygen safety

Patients using medical oxygen at home should follow additional safety precautions:

• Inform the local fire department that oxygen is stored in the home
• Install and maintain working smoke detectors in all rooms
• Do not smoke or allow others to smoke in the same room as oxygen equipment
• Keep oxygen equipment at least 2 meters (6 feet) from any source of heat or flame, including candles, gas stoves, and electric heaters
• Avoid using petroleum-based skin creams or lip balms near the nose while using nasal cannulae — use water-based alternatives
• Ensure the room is well-ventilated; do not use oxygen in confined, unventilated spaces

What Does Medical Oxygen Contain?

Medical oxygen contains at least 99.5% pure oxygen (O₂) as its sole active ingredient. It is produced by fractional distillation of liquid air (cryogenic separation) or by pressure swing adsorption (PSA). There are no excipients, preservatives, or additives.

Medical Oxygen Nippon Gases Scandinavia is a single-component pharmaceutical product. The active substance is molecular oxygen (O₂), a colorless, odorless, and tasteless gas that makes up approximately 21% of Earth's atmosphere. For medicinal use, oxygen is concentrated to a purity of at least 99.5% (v/v) as specified by the European Pharmacopoeia (Ph. Eur. monograph 0417).

Manufacturing process

Medical oxygen is primarily produced by two methods:

• Cryogenic air separation (fractional distillation): Air is compressed, cooled to cryogenic temperatures (-183°C for oxygen), and separated into its component gases based on their different boiling points. This method produces the highest purity oxygen and is used by industrial gas companies such as Nippon Gases for large-scale production
• Pressure swing adsorption (PSA): Air is passed through zeolite molecular sieves that selectively adsorb nitrogen, producing oxygen with a purity of approximately 93-95%. PSA systems are used in hospitals for on-site oxygen generation, particularly in resource-limited settings

Quality specifications

According to the European Pharmacopoeia, medical oxygen must meet the following specifications:

• Purity: Not less than 99.5% O₂ (v/v) for gas from cryogenic sources
• Carbon monoxide: Not more than 5 ppm
• Carbon dioxide: Not more than 300 ppm
• Water content: Not more than 67 ppm (dew point -46°C at 1 atm)
• No oil or particulate contamination: Gas must be free from oil mist and solid particles

Each batch of medical oxygen undergoes quality control testing to verify compliance with pharmacopoeia standards. Certificates of analysis are provided with each delivery, documenting the purity and contaminant levels of the specific batch.

Frequently Asked Questions About Medical Oxygen