Safety of physiotherapy techniques
Only three trials reported on how techniques
were tolerated by patients. Two trials reported a
negative effect on FEV1 during the use of percussion. This
coincided with some suggestions that physiotherapy, particularly
percussion, may be harmful to this population .
However, since percussion did not produce any beneficial
effects in patients with an acute exacerbation of COPD, there
is no evidence to support its use regardless of the negative
effect of percussion on FEV1.