Severity

RV: LV pressure

Gradient across the pulmonary valve

Mild

< ½

<35 to 40 mmHg

Moderate

½< RVP< ¾

>40 mmHg

Severe

≥ 3/4

>60 to 70 mmHg
The degree of severity of pulmonary valve stenosis has been defined by the ratio of the right ventricular pressure to the left ventricular pressure (RV:LV pressure), we well as the peak systolic gradient across the pulmonary valve
Table 1: Characterization of degree of pulmonary valve stenosis.