Twenty-eight patients suffering from cystic fibrosis, with an age range of 8-21 years entered a randomised cross-over trial to study the efficacy of the Positive Expiratory Pressure (PEP) mask as a method of chest physiotherapy, both on its own and in conjunction with other physiotherapy techniques. Twenty-four of these patients completed the trial consisting of 4 treatment programmes each lasting one month and with no wash-out period between them. Five of these patients went on to a fifth programme of Forced Expiratory Technique (FET) alone. At the end of the trial, no significant difference was found between the programmes as regards growth, Shwachman score, Chrispin-Norman score or pulmonary function tests. Twenty-three patients chose to continue using the PEP mask in conjunction with FET long-term as their chest physiotherapy programme as they felt it was an effective treatment allowing increased independence, with postural drainage being kept to a minimum.

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