Immediate effects of positive expiratory pressure and continuous positive airway pressure breathing on changes in inspiratory capacity as an indirect measure of induced changes in functional residual capacity in healthy individuals
(English)Manuscript (preprint) (Other academic)
Introduction: Positive expiratory pressure (PEP) and continuous positive airway pressure (CPAP) are used to enhance breathing parameters such as functional residual capacity (FRC) in patients. Studies comparing effects of PEP and CPAP on FRC are sparse. One reason for this may be that sophisticated equipment, not suitable in the clinical setting, is required. Total lung capacity consists of inspiratory capacity (IC) and FRC and a change in IC should therefore result in a corresponding change in FRC. We aimed to investigate if PEP and CPAP induced changes in IC could be used as an indirect measure of changes in FRC and also to evaluate immediate effects of PEP and CPAP devices, with different kinds of resistors, on IC.
Methods: 20 healthy volunteers breathed with two PEP devices, a PEP-mask (flow resistor) and a PEP-bottle (threshold resistor) and two CPAP devices, a flow resistor device and a threshold resistor device, in a randomized order. The measurement sequence consisted of 30 breaths with an IC measurement performed before and immediately after the 30th breath, while the participants were still connected to the respective breathing device. Perceived exertion of the respective 30 breaths was measured with Borg CR10 scale.
Results: Three of the four breathing devices, the PEP-mask and the two CPAP devices, significantly decreased IC (p < 0.001). Median perceived exertion was quite low for all four breathing devices but the difference in perceived exertion within the different breathing devices was large.
Conclusion: When measured in direct continuation of PEP and CPAP breathing, changes in IC could be used as an indirect measure of changes in FRC. All investigated breathing devices except the PEP-bottle decreased IC, i.e. increased FRC.
PEP, CPAP, Threshold resistor, Flow resistor, Inspiratory capacity, Borg CR10 scale.
Physiotherapy Anesthesiology and Intensive Care
IdentifiersURN: urn:nbn:se:umu:diva-93677OAI: oai:DiVA.org:umu-93677DiVA: diva2:750797