In IOS, the elastic properties of the lung periphery are looked at in terms of Capacitance.
Capacitance can be defined as the ability to store energy.
Reactance (X) is measured and reported across the same frequencies as resistance (5-30Hz).
X5 = Lung reactance at 5Hz
Elasticity of lung & thorax
Dimensions of ventilated airways
Indirect indication of peripheral airway
obstruction
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