Efficacy of high frequency chest wall oscillation functions in chronic bronchitis

Abstract EN

A twenty male patients with chronic bronchitis participated in this study, alter giving a written informed consent, in order 10 investigate the changes that occur in the ventilatory Junctions and, arterial oxygen saturation percentage as a result for administration of high-frequency chest wall oscillation.

The ace of the subjects ranged between 60 n 70 years.

They underwent a thorough nedreal and physical examinations.

None of the subjects complains of any disease that is ontraindicated for the study.

« High-frequency chest wall oscillation was administered at 8 Hz.

16 l-Hz, and 24 H/.

each for 5 minutes, with a pressure span ill5/+ 10 mm Hg.

The sessions were daily, fifteen minutes for each session, two sessions per day for three months duration.-The session was performed with patients in sitting position and proceeded from the lowest to highest 'frequency.

Pulmonary function.

Tests: forced vital capacity (FVC)*£forced expiratory volume in the first second of exhalation (FEVI) and .arterial, oxygen saturation percentage (02 sat %) were performed and measured before the first session and then alter completion of three months.

The results showed that there lire significant increase in forced vital capacity (FVC), forced expiratory volume in the first second of exhalation (FEVI) and arterial oxygen saturation percentage (02 sat %) a I lei administiation of high-frequency chest wall oscillation in cases of chronic bronchitis for three months.

These effects have been attributed to improved interregional and intraregional gas mixing, mucus shearing due to increased mucus-airflow interaction, cnhancemem of cilia hem-frequency as a result of the i el lex mechanism, and facilitation of the cephaled movement of mucus by the higher expiratory flows.