Changes

3. '''Supravalvular''' (occurs above the valve)  

3. '''Supravalvular''' (occurs above the valve)  

'''Most ''cases of pulmonic stenosis are '''valvular''', whilst supravalvular pulomic stenosis is rare. Stenosis of the pulmonary outflow tract is the result of dysplastic changes in the pulmonic valve. Concentric hypertrophy of the right ventricle forms as a direct result of the chronic pressure overload needed to surpass the increased resistance from the stenotic pulmonary outflow tract. This concentric hypertrophy causes decreased ventricular filling during diastole and elevated right atrial pressure from the blood are unable to fill the ventricle causes atrial dilation. Tricuspid valve regurgitation can also be present and adds to the atrial pressure.

'''Most '''cases of pulmonic stenosis are '''valvular''', whilst supravalvular pulomic stenosis is rare. Stenosis of the pulmonary outflow tract is the result of dysplastic changes in the pulmonic valve. Concentric hypertrophy of the right ventricle forms as a direct result of the chronic pressure overload needed to surpass the increased resistance from the stenotic pulmonary outflow tract. This concentric hypertrophy causes decreased ventricular filling during diastole and elevated right atrial pressure from the blood are unable to fill the ventricle causes atrial dilation. Tricuspid valve regurgitation can also be present and adds to the atrial pressure.

==Signalment==

==Signalment==