title: Circuit compliance compensation in lung protective ventilation.
abstract: Lung protective ventilation utilizes low tidal volumes to ventilate patients with severe lung pathologies. The compensation of breathing circuit effects, i.e. those induced by compressible volume of the circuit, results particularly critical in the calculation of the actual tidal volume delivered to patient's respiratory system which in turns is responsible of the level of permissive hypercapnia. The present work analyzes the applicability of the equation for circuit compressible volume compensation in the case of pressure and volume controlled lung protective ventilation. Experimental tests conducted in-vitro show that the actual tidal volume can be reliably estimated if the compliance of the breathing circuit is measured with the same parameters and ventilation technique that will be utilized in lung protective ventilation. Differences between volume and pressure controlled ventilation are also quantitatively assessed showing that pressure controlled ventilation allows a more reliable compensation of breathing circuit compressible volume.
authors.affiliation: Faculty of Biomedical Engineering, University Campus Bio-Medico of Rome, Italy.
authors.forename: Grazia Maria Pia
authors.initials: GM
authors.lastname: Masselli
authors.forename: Sergio
authors.initials: S
authors.lastname: Silvestri
authors.forename: Salvatore Andrea
authors.initials: SA
authors.lastname: Sciuto
authors.forename: Paolo
authors.initials: P
authors.lastname: Cappa
mesh_terms: D004867:Equipment Design; D006801:Humans; D008168:Lung / Q000473:pathology; D008170:Lung Compliance; D015233:Models, Statistical; D008962:Models, Theoretical; D011175:Positive-Pressure Respiration; D011312:Pressure; D012119:Respiration; D012121:Respiration, Artificial; D012129:Respiratory Function Tests; D015656:Respiratory Mechanics; D013990:Tidal Volume; D012122:Ventilators, Mechanical