Pressure-Volume Loops

Pressure-Volume (PV) loops capture the quasi-static mechanical properties of the respiratory system. The Salazar-Knowles equation can be fit to the PV loops, and quasi-static elastance and compliance values can be calculated.

Related Product: flexiVent

Parameters

Abbr.ParameterDescription
ASalazar-Knowles ParameterThe parameter A of the Salazar-Knowles equation is an upper bounds estimate of the difference between total lung capacity and zero volume.
BSalazar-Knowles ParameterThe parameter B of the Salazar-Knowles equation is an upper bounds estimate of the difference between total lung capacity and the predicted volume at zero pressure.
KSalazar-Knowles ParameterThe parameter K of the Salazar-Knowles equation reflects the curvature of the upper portion of the deflation PV curve.
CstQuasi-static ComplianceQuasi-static compliance reflects the static elastic recoil pressure of the lungs at a given lung volume.
EstQuasi-static ElastanceQuasi-static elastance reflects the static elastic recoil pressure of the lungs at a given lung volume.
CODCoefficient of DeterminationThe COD is a quality control parameter measuring the goodness of the model fit.
AreaArea of PV LoopThe area enclosed by the pressure volume loop provides an estimate of the amount of atelectasis (airspace closure) that existed before the PV loop manoeuvre.