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This section allows you to compare measurements and outcome parameters, and to find suitable SCIREQ products based on the parameters you wish to measure.
Measurements & Outcome Parameters
| Parameter | Abbr. | Description |
|---|---|---|
| Resistance | R | Dynamic resistance quantitatively assesses the level of constriction in the lungs. |
| Newtonian Resistance | Rn | The Newtonian Resistance parameter of the Constant Phase Model represents the resistance of the central airways. |
| Coefficient of Determination | COD | The COD is a quality control parameter measuring the goodness of the model fit. |
| Inertance | I | The Inertance parameter of the Constant Phase Model represents the inertive properties of the gases in the airways. |
| Tissue Damping | G | Tissue damping is closely related to tissue resistance and reflects the energy dissipation in the lung tissues. |
| Tissue Elastance | H | The parameter H is closely related to tissue elastance and reflects the energy conservation in the lung tissues. |
| Hysteresivity | eta | Tissue hysteresivity ({eta}) characterizes the ratio of energy dissipation to energy conservation in the lung tissues. |
| Compliance | C | Dynamic compliance captures the ease with which the lungs can be extended. |
| Elastance | E | Dynamic elastance captures the elastic rigidity of the lungs. |
| Salazar-Knowles Parameter | A | The parameter A of the Salazar-Knowles equation is an upper bounds estimate of the difference between total lung capacity and zero volume. |
| Salazar-Knowles Parameter | B | The 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. |
| Salazar-Knowles Parameter | K | The parameter K of the Salazar-Knowles equation reflects the curvature of the upper portion of the deflation PV curve. |
| Quasi-static Compliance | Cst | Quasi-static compliance reflects the static elastic recoil pressure of the lungs at a given lung volume. |
| Quasi-static Elastance | Est | Quasi-static elastance reflects the static elastic recoil pressure of the lungs at a given lung volume. |
| Area of PV Loop | Area | The area enclosed by the pressure volume loop provides an estimate of the amount of atelectasis (airspace closure) that existed before the PV loop manoeuvre. |
| Inspiratory Capacity | IC | IC is the volume difference between functional residual capacity (FRC) and total lung capacity (TLC), also equalling tidal volume plus the inspiratory reserve volume. |
| Functional Residual Capacity | FRC | FRC reflects the volume of air remaining in the lungs at the end of a normal tidal expiration. |
| Forced Expiratory Volume | FEVx | FEVx, i.e. the volume expired during the first x seconds of a forced expiration, is indicative of obstructive airway disease and increased expiratory flow limitation. |
| Forced Vital Capacity | FVC | FVC, reflecting the total volume expired during a forced expiration, is typically reduced in many lung diseases. |
| Forced Expiratory Flow | FEFx | FEFx is the expiratory flow calculated at a specific time or volume fraction into a forced expiration. |
| Peak Expiratory Flow | PEF | PEF is the highest expiratory flow achieved during a forced expiration. |
| Input Impedance | Z | Input Impedance expresses the combined effects of resistance, compliance and inertance as a function of frequency. |
| Resistance vs. frequency | R(f) | The real part of input impedance ({meas:Z}) can be expressed as resistance versus frequency. |
| Reactance vs. frequency | X(f) | The imaginary part of input impedance ({meas:Z}) can be expressed as reactance versus frequency. |
| Enhanced Pause | Penh | Penh is an empirical measurement that is influenced by a number of factors, including, but not limited to bronchoconstriction. |
