Evidence supports the effectiveness of chest physical therapy technique (CPT) to improve alveolar collapse and remove pulmonary secretion. A previous study has shown that the positive airway pressure technique reduced work of breathing (WOB) and re-inflated lung atelectasis. The use of positive pressure devices has been part of physiotherapy intervention since intermittent positive pressure breathing was introduced in clinical practice. In intensive care settings, the use of positive pressure by physiotherapists includes manual hyperinflation (bagging or bag squeezing), which has been shown to increase oxygenation and mobilize excessive bronchial secretions, and to re-inflate collapsed areas.