![]() ![]() It is recommended for both the prevention of postoperative atelectasis and the treatment of established atelectasis. This device is more effective than the paper bag and less expensive than carbon dioxide. ![]() The effectiveness of the deadspace rebreathing tube for inducing hyperpnea has been tested in more than 1,000 cases. 1.The normal value for dead space volume (in mL) is approximately the lean mass of the body (in pounds), and averages about a third of the resting tidal volume (450-500 mL). Blowing 100% oxygen into the open end of the tube prevented hypoxia without abolishing the hyperpnea and showed that the alveolar carbon dioxide was the critical factor. Increasing the volume of the tube caused corresponding increases in the carbon dioxide content of alveolar air and the respiratory minute volume without much rate change. to the physiological dead air space and it more than doubled the patient's initial tidal volume. ![]() A rubber tube with internal diameter of 3.2 cm. Hyperventilation, useful in preventing or treating atelectasis, was induced by having patients breathe through a sufficiently long tube. ![]()
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