Pneumatic performance of the boussignac CPAP system in healthy humans
2011 (English)In: Respiratory care, ISSN 0020-1324, Vol. 56, no 6, 818-826 p.Article in journal (Refereed) Published
BACKGROUND: The Boussignac CPAP has been found to effectively treat acute pulmonary oedema. However, data on airway pressure in association with the Boussignac CPAP are sparse. We therefore designed this study to evaluate the stability of the Boussignac CPAP in terms of maintaining adequate inspiratory and expiratory pressure levels. We also wanted to evaluate the perceived exertion when breathing with the Boussignac CPAP.
METHODS: Continuous recordings of airway pressure and airflow were made in 18 healthy volunteers during breathing with the Boussignac CPAP at 5, 7.5 and 10 cm H₂O for three sessions of 10 minutes at each CPAP level. Participants were blinded for the sequential order of the investigated CPAP levels. They terminated each session, at the respective CPAP level, by taking 10 forced breaths.
RESULTS: During 10 minutes normal breathing periods, when participants breathed at 20 % of their VC with a peak expiratory airflow of 14 % of FEV₁, the maximal pressure difference was 4.0 cm H₂O between inspiration and expiration at CPAP 10 cm H₂O. Changes in airway pressure were never large enough to reduce airway pressure below zero. When taking forced breaths, expiratory volume was 38-42 % of VC and peak expiratory airflow was 49-56 % of FEV ₁. As airflow increased, both the drop in inspiratory airway pressure and the increase in expiratory airway pressure were enhanced.
CONCLUSIONS: Pressure changes during breathing with CPAP are considered to be associated with increased work of breathing. The pneumatic performance of the Boussignac CPAP is adequate during normal breathing with low airflow. However, during forced breathing resulting in increased airflow, the Boussignac CPAP is unable to maintain stable airway pressure levels, possibly resulting in increased work of breathing and respiratory fatigue. Thus, the Boussignac CPAP system might be less suitable for patients breathing at a higher frequency.
Place, publisher, year, edition, pages
American Association for Respiratory Care , 2011. Vol. 56, no 6, 818-826 p.
CPAP, continuous positive airway pressure, noninvasive ventilation, air flow, airway pressure, Borg CR10 scale, flow resistor
Anesthesiology and Intensive Care
IdentifiersURN: urn:nbn:se:umu:diva-40872DOI: 10.4187/respcare.01015ISI: 000291779500011PubMedID: 21333088OAI: oai:DiVA.org:umu-40872DiVA: diva2:403542