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Tubes designed to increase the carbon dioxide content in the patient\'s breathing by partially feeding back his or her own exhaled air (i.e., rebreathing). These devices typically consist of a tube that can adjust the proportion of normal/rebreathing air in the patient\'s breath. Rebreathing tubes stimulate hyperventilation; they are intended to reduce respiratory complications, such as incomplete expansion of the lungs (atelectasis) and posterior pneumonia, especially after surgery. Small portable rebreathing devices that include several internal interconnected chambers are also available.
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