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A simple technique for producing supravalvular aortic stenosis in animals.

S F Chien1, J N Diana, J M Brum

  • 1Department of Physiology and Biophysics, University of Kentucky, College of Medicine, Lexington 40536.

Cardiovascular Research
|October 1, 1988
PubMed
Summary

A new surgical technique safely creates supravalvular aortic stenosis in dogs, allowing for controlled pressure gradients and reproducible left ventricular hypertrophy. This method avoids aortic rupture and is effective in both puppies and adult animals.

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Area of Science:

  • Cardiovascular Surgery
  • Animal Models
  • Surgical Techniques

Background:

  • Supravalvular aortic stenosis (SAS) is a congenital heart defect.
  • Creating reproducible animal models of SAS is crucial for research.
  • Existing methods for inducing SAS in animals present significant challenges.

Purpose of the Study:

  • To develop a safe and reproducible surgical technique for creating supravalvular aortic stenosis in dogs.
  • To establish a reliable animal model for studying SAS and its effects.
  • To overcome the difficulties associated with previous methods of inducing aortic stenosis.

Main Methods:

  • A Dacron patch was used to encircle the ascending aorta in anesthetized dogs.
  • Venous return was temporarily halted, and a J-shaped clamp was applied.

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  • Continuous mattress sutures were used to plicate the aorta, creating stenosis.
  • Left ventricular (LV) and aortic (AO) pressures were measured post-operatively.
  • Additional sutures were used to adjust the pressure gradient and induce LV hypertrophy.

    • Main Results:

    • Post-operative LV-AO systolic pressure gradients ranged from 40-75 mm Hg, increasing to 50-200 mm Hg at 2-6 months.
    • Significant increases in left ventricular and heart weight to body weight ratios were observed compared to controls.
    • Reproducible left ventricular hypertrophy was achieved in a shorter time frame.
    • The technique eliminated the risk of aortic rupture.
    • The method proved effective in both puppies and adult dogs.

    Conclusions:

    • A safe, reproducible, and controllable surgical technique for inducing supravalvular aortic stenosis in dogs was successfully developed.
    • This method provides a valuable animal model for cardiovascular research, enabling the study of SAS and resulting cardiac remodeling.
    • The technique's ability to induce controlled pressure gradients and reproducible hypertrophy offers advantages over existing methods.