A device that delivers a positive pressure breath followed by a rapid switch to negative pressure is used to:

• 1 Provide continuous positive airway pressure during sleep at night
• 2 Deliver aerosolized medication into the peripheral airways directly
• 3 Measure the maximal inspiratory pressure that a patient can generate
• 4 Simulate a cough and clear secretions in patients with weak expiratory muscles ✓ 정답

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