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Related Experiment Video

Updated: Jul 5, 2026

Chronic Ovine Model of Right Ventricular Failure and Functional Tricuspid Regurgitation
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Published on: March 17, 2023

Chronic heart failure induced by multiple sequential coronary microembolization in sheep.

J D Schmitto1, P Ortmann, R Wachter

  • 1Department of Thoracic, Cardiac and Vascular Surgery, University of Goettingen, Goettingen, Germany. schmitto@med.uni-goettingen.de

The International Journal of Artificial Organs
|April 25, 2008
PubMed
Summary

This study developed a new sheep model for chronic heart failure using microembolization. This model effectively simulates heart failure, aiding research on ventricular assist devices and recovery mechanisms.

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Last Updated: Jul 5, 2026

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Area of Science:

  • Cardiovascular Research
  • Animal Models
  • Heart Failure Pathophysiology

Background:

  • Existing animal models for acute ischemia and heart failure are abundant, but models for chronic heart failure suitable for ventricular assist device studies are limited.
  • There is a need for a stable and reproducible animal model to investigate chronic heart failure and its management.

Purpose of the Study:

  • To establish a reliable and reproducible animal model of chronic heart failure in sheep.
  • To assess the efficacy of sequential microembolization in inducing chronic ischemic cardiomyopathy.
  • To provide a suitable model for studying interventions like ventricular assist devices.

Main Methods:

  • Eight sheep underwent sequential intracoronary microembolization of the left main coronary artery using polysterol microspheres.
  • Microembolization procedures were repeated at 2-3 week intervals until stable clinical signs of heart failure emerged.
  • Clinical and echocardiographic data were collected at baseline and 3 months post-initial microembolization; histological examination was performed post-mortem.

Main Results:

  • All sheep developed clinical signs of chronic heart failure, including increased heart rate, respiratory rate, and body weight due to fluid accumulation (edema, ascites).
  • Echocardiography showed a significant increase in left ventricular end-diastolic diameter, indicating cardiac dysfunction.
  • Control sheep showed no significant clinical or echocardiographic changes.

Conclusions:

  • Multiple sequential intracoronary microembolization effectively induces chronic ischemic cardiomyopathy in sheep.
  • This model exhibits clinical and echocardiographic signs of heart failure, making it suitable for research on ventricular assist devices.
  • The model can be utilized to study mechanical unloading, recovery mechanisms, and reverse remodeling in chronic heart failure.