primary studies published, non RCT Comparative trial of manual and mechanical percussion technique with gravity-assisted bronchial drainage in patients with cystic fibrosis. Year: 1979 Date: 1979 Author: Maxwell M Source Arch Dis Child. 1979 Jul;54(7):542-4. Participants 14 patients with cystic fibrosis Interventions mechanical and manual percussion physiotherapy Outcome measures sputum volumes, and FEV1 and FVC Main results Results with mechanical percussor were as good as with the manual percussor and, therefore, it would be reasonable for the older patient to use the former on his own. Related topics Active cycle of breathing technique in cystic fibrosis Oscillating devices in cystic fibrosis Positive expiratory pressure in cystic fibrosis