Evaluation
The initial evaluation of pulmonary valve stenosis involves echocardiography. The degree of stenosis is typically determined by the peak pressure gradient across the valve. Pulmonary stenosis is mild if the valve area is larger than 1.0 cm2 per square meter and the trans-valvular gradient is 50-80 mmHg, or the peak RV systolic pressure is less than 75 mmHg. The stenosis is moderate if valve area is 0.5-1.0 cm2 per square meter, trans-valvular gradient is 50-80 mmHg, or right ventricle systolic pressure is 75-100 mmHg. It is severe when the valve area is less than 0.5 cm2, and the gradient is more than 80 mmHg.
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