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Related Experiment Video

Updated: Jun 20, 2026

A Large Animal Model for Pulmonary Hypertension and Right Ventricular Failure: Left Pulmonary Artery Ligation and Progressive Main Pulmonary Artery Banding in Sheep
07:02

A Large Animal Model for Pulmonary Hypertension and Right Ventricular Failure: Left Pulmonary Artery Ligation and Progressive Main Pulmonary Artery Banding in Sheep

Published on: July 15, 2021

The relationship between pulmonary system impedance and right ventricular function in normal sheep.

Alexander S Kuo1, Hitoshi Sato, Junewai L Reoma

  • 1Department of Surgery, University of Michigan, B560B MSRBII, 1150 W. Medical Center Dr., Ann Arbor, MI, 48109, USA.

Cardiovascular Engineering (Dordrecht, Netherlands)
|September 29, 2009
PubMed
Summary

The zeroth harmonic impedance (Z0) is the main factor affecting right ventricular (RV) performance under high afterload. While the first harmonic impedance (Z1) also impacts RV function, its effect is minor compared to Z0.

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Area of Science:

  • Cardiovascular Physiology
  • Pulmonary Circulation Dynamics
  • Biomedical Engineering

Background:

  • Right ventricular (RV) afterload critically influences RV function, especially in cardiopulmonary diseases.
  • Pulmonary circulation input impedance quantifies afterload but is complex for widespread use.

Purpose of the Study:

  • To investigate the impact of specific impedance spectrum components (zeroth and first harmonic moduli, Z0 and Z1) on RV performance.
  • To simplify afterload assessment by focusing on key impedance parameters.

Main Methods:

  • An artificial circuit altering resistance and compliance was inserted into the pulmonary circulation of five sheep.
  • Pulmonary impedance was calculated using Fourier transforms of pulmonary artery pressure and flow data.
  • Z0 and Z1 were systematically varied to assess their effects on cardiac output.

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Last Updated: Jun 20, 2026

A Large Animal Model for Pulmonary Hypertension and Right Ventricular Failure: Left Pulmonary Artery Ligation and Progressive Main Pulmonary Artery Banding in Sheep
07:02

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Main Results:

  • Percent change in cardiac output (%ΔCO) showed a linear relationship with changes in Z0 (ΔZ0).
  • Increases in Z1 (ΔZ1) reduced %ΔCO, with this effect intensifying as ΔZ0 increased.
  • A regression equation was derived: %ΔCO = (-0.0829ΔZ1 - 3.65)ΔZ0 - 9.02 (R² = 0.69).

Conclusions:

  • Z0 is the primary determinant of cardiac output during acute, high afterload conditions.
  • The influence of Z1 on RV performance is secondary to Z0 in these states.
  • Higher harmonic impedances have minimal impact on RV function.