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Oxygen Therapy: Uses, Effects and Risks

Oxygen therapy is a medical treatment in which patients receive supplemental oxygen to correct low blood oxygen levels and ensure adequate supply to vital organs.

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Things worth knowing about "Oxygen Therapy"

Oxygen therapy is a medical treatment in which patients receive supplemental oxygen to correct low blood oxygen levels and ensure adequate supply to vital organs.

What is Oxygen Therapy?

Oxygen therapy (also called supplemental oxygen therapy or O2 therapy) is a medical intervention in which patients receive oxygen at concentrations higher than those found in normal air, delivered via masks, nasal cannulas, or ventilators. The goal is to raise the level of oxygen in the blood – known as oxygen saturation – to a safe and sufficient level, thereby ensuring adequate oxygenation of the brain, heart, and other vital organs.

Indications

Oxygen therapy is used in a wide range of conditions where the body is unable to take in or transport enough oxygen:

Chronic Obstructive Pulmonary Disease (COPD)
Pneumonia (lung infection)
Heart failure
Pulmonary embolism (blood clot in the lung)
Sleep apnea (severe cases)
Acute respiratory distress from asthma or allergic reactions
Stroke or heart attack
Poisoning, e.g., carbon monoxide poisoning
Post-operative monitoring and intensive care

Mechanism of Action

Normal air contains approximately 21% oxygen. Oxygen therapy increases this concentration to raise the partial pressure of oxygen in the lungs, which in turn increases the amount of oxygen that diffuses into the bloodstream. Oxygen is then carried by red blood cells via the protein hemoglobin to tissues throughout the body. When blood oxygen saturation falls below 90%, the condition is called hypoxemia, which can be life-threatening without prompt treatment.

Delivery Methods

Nasal Cannula

The most common and comfortable method. A thin plastic tube with two small prongs is inserted into the nostrils, delivering oxygen at flow rates of 1 to 6 liters per minute, corresponding to an inspired oxygen concentration of approximately 24–44%.

Simple Face Mask

Covers both the mouth and nose and allows higher flow rates of 5 to 10 liters per minute. Suitable for patients with moderate hypoxemia.

Non-Rebreather Mask

Used in cases of severe hypoxemia. This mask features a reservoir bag that stores oxygen between breaths and can deliver oxygen concentrations of up to 90%.

High-Flow Nasal Cannula (HFNC)

Using heated and humidified nasal cannulas, flow rates of up to 60 liters per minute can be delivered with precisely controlled oxygen concentrations. This method is widely used in intensive care units and for patients with severe respiratory failure.

Home Oxygen and Long-Term Oxygen Therapy (LTOT)

Patients with chronic conditions such as advanced COPD may use oxygen therapy at home, typically through portable oxygen concentrators or compressed gas cylinders. Long-term oxygen therapy is indicated when resting oxygen saturation consistently falls below 88%, and is usually recommended for at least 16 hours per day.

Monitoring and Dosage

Oxygen delivery is always individually adjusted and closely monitored. Key tools include:

Pulse oximetry: A non-invasive method that measures blood oxygen saturation through the skin.
Arterial blood gas (ABG) analysis: Provides precise measurements of oxygen and carbon dioxide levels in the blood.

For most patients, the target oxygen saturation is 94–98%. For patients with COPD and chronic hypercapnia (elevated CO2), a lower target range of 88–92% is recommended, as excessive oxygen can suppress the respiratory drive in these individuals.

Risks and Side Effects

Although oxygen is essential for life, uncontrolled or excessive supplementation carries risks:

Hyperoxia: Excessively high oxygen levels can damage lung tissue and generate harmful free radicals.
CO2 retention (hypercapnia): In COPD patients, too much oxygen can reduce the drive to breathe and cause dangerous CO2 buildup.
Drying of mucous membranes: Dry oxygen can irritate the nasal passages and throat; humidification is therefore often applied.
Fire hazard: Oxygen accelerates combustion; open flames and smoking must be strictly avoided near any oxygen source.

References

World Health Organization (WHO) – Oxygen therapy for children: A manual for health workers. WHO Press, 2016.
Global Initiative for Chronic Obstructive Lung Disease (GOLD) – Global Strategy for the Diagnosis, Management, and Prevention of COPD. 2024 Report. Available at: goldcopd.org
Siemieniuk RAC et al. – Oxygen therapy for acutely ill medical patients: a clinical practice guideline. BMJ, 2018; 363:k4169.

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