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. 2018 May 11;2(1):37–43. doi: 10.1002/ped4.12022

Figure 4.

Figure 4

Planar representation of phase relationships between resistive (R), elastic/compliant (Xc) and inertive pressures (Xi). The arithmetic sum of elastic and inertive pressure at any given moment is termed the “reactance,” X. X is 90 degrees out of phase with R. The total impedance, Z, is the vector sum of the reactance and resistance, and has both a magnitude and a phase angle.