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  • Pulmonic stenosis is reported to be the 3rd most prevalent congenital cardiac disorder in the dog.
  • The stenotic lesion may occur in the:
    • subvalvular position
    • valvular position or
    • supravalvular position
  • The valvular disorder is the most common in the dog (88% incidence). Usually the commissures of the valve are fused and the free edges are thickened. Pulmonic stenosis is a very uncommon congenital heart disorder in the cat.
  • The hemodynamic consequences of pulmonic stenosis are the development of right ventricular concentric hypertrophy and reduced filling of the left ventricle. The right ventricular concentric hypertrophy causes reduced right ventricular compliance with reduced distensibility. The hypertrophied right ventricular wall is prone to initiate dysrhythmias.