الفهرس 
Effect of high frequency chest wall oscillation on pulmonary function following upper abdominal surgeries
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Abstract
The purpose: This study was conducted to demonstrate the effectiveness of the high frequency chest wall oscillator for improving the pulmonary functions of upper abdominal surgery patients. Thirty patients (25 males and 5 females) underwent upper abdominal surgeries with ages ranged from 25-50 years were selected randomly and divided into two equal groups in number, each group contained 15 patients. Patients in group (A) received high frequency chest wall oscillator at frequency from 10 Hz to 15 Hz and pressure from 40 mm/Hg to 70 mm/Hg in addition to conventional chest physical therapy intervention (Deep breath, cough training and early ambulation) while patients in group (B) received conventional chest physical therapy intervention. Patients in both groups were assessed before treatment (pre-training) and after 10 days of treatment (post-training) to measure forced expiratory volume in 1 second (FEV1) and peak expiratory flow (PEF) using pulmonary function test (PFT).Results: The results of this study showed that there was significant increase in both forced expiratory volume in 1 second (FEV1) and peak expiratory flow (PEF) for both groups of the study in a favor of group (A).Conclusion: It was concluded that adding high frequency chest wall oscillator to the conventional routine of chest physical therapy was more effective in improving pulmonary functions than the conventional chest physical therapy alone in post upper abdominal surgeries patients