elastance


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elastance

 [e-las´tans]
the quality of recoiling on removal of pressure without disruption, or an expression of the measure of the ability to do so in terms of unit of volume change per unit of pressure change; it is the reciprocal of compliance.

e·las·tance

(ē-las'tănts),
A measure of the tendency of a structure to return to its original form after removal of a deforming force. In medicine and physiology, usually a measure of the tendency of a hollow viscus (for example, lung, urinary bladder, gallbladder) to recoil toward its original dimensions on removal of a distending or compressing force, the recoil pressure resulting from a unit distention or compression of the viscus; the reciprocal of compliance. The relationship between elasticity and elastance is of the same nature as that between the specific inductive capacity of an insulator material and the capacitance of a particular condenser made from that material.

e·las·tance

(ĕ-las'tăns)
1. A measure of the stiffness of a chamber expressed as a change in pressure per unit change in volume; the reciprocal of compliance.
2. internal medicine, physiology Usually a measure of the tendency of a hollow viscus (e.g., lung, urinary bladder, gallbladder) to recoil toward its original dimensions on removal of a distending or compressing force.
References in periodicals archive ?
Here we show that, at age 28 years, young adults born with VLBW are shorter than age-matched controls and have higher systolic blood pressure, smaller heart size, and higher levels of LV and arterial elastance, along with lower Ln RHI.
We observed significantly lower compliance and higher elastance on D21 in mice with prenatal exposure compared with controls, but there was no significant difference in airway resistance.
Our results showed that the BbCI treatment reduced the respiratory elastance (Ers) and resistance (Rrs).
A greater filling pressure is only indicative of the ventricle's diastolic performance on its elastance curve.
The pressure volume relationship of the abdominal compartment can be represented by an elastance curve (Fig.
The term elastance may also be used and is the inverse of compliance.
3 An approximate model for an abrupt-junction varactor diode in which the minimum incremental elastance [S.sub.min] and the built-in potential [V.sub.bi] are neglected.
Changes in total pulmonary resistance ([R.sub.L]), Newtonian resistance (Rn), which mainly reflects changes in the mechanical properties of the airways, and the coefficients of lung tissue damping (G) and lung tissue elastance (H), measures of changes in the lung periphery, including airway closure, were assessed after aerosolized saline and after increasing doses of aerosolized methacholine.
Due to its pressure-dependency, dP/dt [153] is a very vague parameter to describe RV contractility and therefore we need studies (in humans as well as animals) that investigate RV contractility and RV-arterial coupling using the accepted parameters Ees/Ea (ventricular end-systolic elastance/arterial elastance), in order to be able to measure the "correct" systolic function.
However, airway pressure (P[sub]aw) stress index may not reflect lung mechanics in the patients with high chest wall elastance. This study was to evaluate the P[sub]awstress index on lung mechanics and the correlation between P[sub]awstress index and transpulmonary pressure (P[sub]L) stress index in acute respiratory failure (ARF) patients.
We found that the subjects with higher TLV and TAV values exhibited greater homogeneity (positive correlations with S and Xm and negative correlation with Fr), lower elastance (positive correlation with Cdyn), and lower breathing effort (negative correlation with Zrs4Hz).
In this study, the idealized time evolution of the elastance function was used as follow [20]: