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Related Experiment Videos

Open resection for subvalvular aortic stenosis in dogs

E Monnet1, E C Orton, J S Gaynor

  • 1Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins 80523, USA.

Journal of the American Veterinary Medical Association
|October 1, 1996
PubMed
Summary

Open resection of congenital subvalvular aortic stenosis in dogs significantly reduced pressure gradients. However, sudden death occurred in some dogs, indicating this surgery is not a definitive cure.

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Area of Science:

  • Veterinary Surgery
  • Cardiology
  • Canine Health

Background:

  • Congenital subvalvular aortic stenosis (SAS) is a serious condition in dogs.
  • Surgical intervention aims to alleviate obstruction and improve quality of life.

Purpose of the Study:

  • To detail the surgical technique for open resection of congenital SAS in dogs.
  • To evaluate the outcomes and survival rates following this procedure.

Main Methods:

  • An uncontrolled clinical trial involving 17 dogs with congenital SAS.
  • Surgical technique included cardiopulmonary bypass, aortic cross-clamping, and resection of the subvalvular fibrous ring.
  • Septal myectomy was performed in 11 dogs concurrently.

Main Results:

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  • Fifteen of 17 dogs survived surgery.
  • Mean aortic systolic pressure gradient decreased significantly from 119 mmHg pre-operatively to 41 mmHg at 12 months post-operatively.
  • Four dogs experienced sudden death between 7 days and 30 months post-surgery, with three having severe pre-operative gradients and ventricular tachycardia.

Conclusions:

  • Open resection effectively reduces pressure gradients in dogs with severe SAS.
  • Sudden death remains a risk post-surgery, suggesting the procedure is not curative.
  • Long-term follow-up is necessary to establish a definitive survival benefit.