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2. Oxygen Concentrator: Uses, Types, and Safety - WebMD

   www.webmd.com/lung/oxygen-concentrator-what-is

   An oxygen concentrator is a medical device that gives you extra oxygen. Air is made up of about 20% oxygen. An oxygen concentrator uses the air in the atmosphere, filters it, and gives you air ...

3. Oxygen therapy - Wikipedia

   en.wikipedia.org/wiki/Oxygen_therapy

   The medical use of oxygen first became common around 1917, and is the most common hospital treatment in the developed world. [ 1 ] [ 9 ] [ 10 ] [ 11 ] It is currently on the World Health Organization's List of Essential Medicines . [ 11 ]

4. What Are the 4 Stages of COPD and the Symptoms of Each?

   www.healthline.com/health/copd/what-are-the-4...

   By stage 3, you may get more frequent flare-ups, and your shortness of breath and coughing will get worse. You will likely find you get tired easier than before. Other potential symptoms can ...

5. The 5 Best CPAP Machines for Sleep Apnea - Healthline

   www.healthline.com/health/best-cpap-machine

   Z2 Auto Travel CPAP Machine. Price: $$. Weight: 10.5 oz. This quiet machine features an in-line muffler to help deaden sound and keep the noise level at 26 decibels, making it a great pick for ...

6. Dyspnea (Shortness of breath): Causes, Symptoms, and ... - WebMD

   www.webmd.com/lung/shortness-breath-dyspnea

   Dyspnea, or shortness of breath, can be caused by various factors and can be a symptom of an underlying medical condition. Learn more about the causes, symptoms, and treatment options for dyspnea ...

7. Respiratory Desaturation (Low Blood Oxygen): Causes and Treatment

   www.healthline.com/health/respiratory-desaturation

   low levels of oxygen in the air, such as when you’re at a high altitude. problems with your lungs’ ability to inhale air. problems with your blood’s ability to circulate to your lungs ...