	Mild	Moderate	Severe
Specific findings
Valve area (cm²)	>1.5	1.0-1.5	<1.0
Supportive findings
Mean gradient (mmHg)*	<5	5-10	>10
Pulmonary artery pressure (mmHg)	<30	30-50	>50

*At heart rates between 60 and 80 bpm and in sinus rhythm.