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.
As a result, most Medicare oxygen equipment providers do not deal in portable oxygen concentrators. Whether you have a home oxygen concentrator, liquid oxygen, tanks, or a portable oxygen concentrator, all of this equipment is considered a rental item in the eyes of Medicare and the equipment company. An equipment company provides the oxygen equipment to you, then they bill Medicare a monthly fixed rental fee.