Why give oxygen?
Oxygen is essential for the metabolic processes in the cell and is therefore essential for the function of tissues in the body. The atmospheric content of oxygen in room air is only 21%. Although this amount is sufficient to meet the needs of healthy individuals, people with certain or severe illnesses can benefit from the increased oxygen content in the gas they breathe, which will increase the oxygen content in their blood. In most cases, increasing the oxygen content to around 30% to 35% is enough to make a significant difference in the oxygen content in the blood.



Nasal cannula oxygen mask
These can be used in patients with acute or chronic respiratory diseases that require low oxygen levels. They are well tolerated and inject oxygen directly into the nostrils. Use an oxygen flow meter to adjust the oxygen flow. Using a flow of 2–6 L per minute, it is estimated that the range of oxygen concentrations achieved is 25% to 40%. However, due to the drying effect on the nasal mucosa, flow rates exceeding 4 L per minute are not recommended (Vines et al., 2000). Dosing may not be very accurate because the actual oxygen intake will vary depending on the patient’s mouth breathing volume (Khaw et al., 2008). To make the nasal cannula fit snugly, pass both ends of the tube through the horizontal tube through the nose and through the adapter on the tube under the chin. With a nasal cannula, people can eat, drink and talk more easily than wearing a mask. Procedures such as oral care can be performed without interrupting the oxygen supply.

These are called Hudson, MC (medium concentration) or semi-rigid. To fit the mask comfortably, the strap should be adjusted to fit behind the ears. The amount of oxygen delivered is adjusted using a flow meter. The exact amount of oxygen delivered depends on the breathing rate and depth of breathing. If the patient breathes quickly, he needs to inhale a large amount of room air and dilute the concentration (Pruitt and Jacobs 2003). The delivery rate of oxygen is 4-15 L per minute, reaching a concentration of 35% to 70% (see the manufacturer’s guidelines for the masks used). Flows below 4 L per minute should not be used, because at low flows, the exhaled carbon dioxide may accumulate in the mask, which may cause rebreathing of carbon dioxide.



Venturi inner membrane system

In the Venturi system, the oxygen concentration is not significantly affected by breathing rate and breathing depth, so it can reach the set concentration. The mask comes with different colored accessories, each of which is clearly marked with the percentage of oxygen and the required flow. This device ensures that the oxygen is accurately diluted by the entrained air. Therefore, you can manage the exact percentage specified by installing the right equipment and setting the correct flow rate.





Non-breathing mask

These have large oxygen reservoirs with valves to allow patients to inhale only oxygen and prevent it from mixing with exhaled gas. The oxygen concentration is determined by a flow meter. They can provide up to 85% of oxygen, especially in the short term, such as after surgery or in an emergency. The valve must be pressed to fill the chamber with oxygen.





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