Oxygen therapy, also known as supplemental oxygen, uses oxygen as a medical treatment. This may include hypoxemia, carbon monoxide poisoning, cluster headaches, and adequate oxygen when using anesthetics. Long-term hypoxia is commonly used in chronic hypoxic people, such as patients with severe COPD or cystic fibrosis. Oxygen can be administered in a variety of ways, including oxygen masks

Normal cell metabolism requires oxygen. Excessive concentrations can cause oxygen poisoning in susceptible people, such as lung damage or respiratory failure. Higher oxygen concentrations also increase the risk of fire, especially when smoking, if not humidified, the nose will dry out. The recommended target oxygen saturation depends on the disease being treated. In most cases, the recommended saturation is 94–96%, and if there is a risk of carbon dioxide retention, the saturation is preferably 88–92%. For patients with carbon monoxide poisoning or cardiac arrest, their saturation should be exhausted. May be very high. The amount of oxygen in the air is typically 21% by volume, while oxygen therapy can increase it by up to 100%.

Around 1917, oxygen was commonly used in the medical profession. It is on the World Health Organization's list of essential medicines, which are the most effective and safest drugs needed in health systems. In Brazil, household oxygen costs about $150 a month and about $400 in the United States.


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