It is a condition where the alveoli are deflated, as distinct from pulmonary consolidation. It is a very common finding in chest x-rays and other radiological studies. It may be caused by normal exhalation or by several medical conditions. Although frequently described as a collapse of lung tissue, atelectasis is not synonymous with a pneumothorax, which is a more specific condition that features atelectasis.
There are two types of portable oxygen concentrators available on the market today: Continuous flow oxygen concentrators and pulse dose, or intermittent flow, oxygen concentrators. These two types of oxygen systems have very different benefits and limitations and each is best suited for a specific type of patient.
Next came portable oxygen tanks, which allowed patients to leave the home with smaller tanks. This made it much easier on patients, but it did limit their time outside the home. One of the greatest developments in home oxygen therapy is the home filled oxygen compressor. This device allows patients to fill their high pressure oxygen tanks and bottles from an oxygen concentrator right inside their home.