IRCT201203169014N8 IRCT 2012-07-09 Vic-Chancellor of Research and Technology, Hamadan University of Medical Sciences The effect of passive respiratory exercises on cardiopulmonary function in patient undergoing mechanical ventilation Comparison of the effect of three passive respiratory exercises (percussion, vibration and manual hyperinflation) methods on cardiopulmonary functions of patient under mechanical ventilation in critical care unit of Besat theraputic and educational center, Hamadan University of Medical Sciences 2012-07-22 anticipated 63 Complete https://irct.ir/trial/9448 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Crossover, Purpose: Treatment. 3 Patient undergoing mechanical ventilation. Intervention 1: Intervention 1: Vibration of the back of thorax using vibrator device once for two minutes. Intervention 2: Intervention 2: Percussion of the back of thorax knocking gentling one for four minutes. Intervention 3: Intervention 3: Manual hyperinflation using ambo bag to inspire via tracheal tube or thoracotomy, stop for three seconds then expire rapidly relaxing ambo bag.