The goal of this clinical trial is to compare the effectiveness of two airway clearance techniques for patients with ventilator associated pneumonia. The main questions it aim to answer are: * effect of the therapies on volume changes * outcome on sputum clearance Participants will receive airway clearance techniques of * chest physiotherapy * high frequency chest wall oscillation.
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end-expiratory lung impedance
Timeframe: Measurement before intervention, 30 after, 1 hour and 2 hours after intervention