From Ask Dr Wiki

Assessment

• Right Ventricular Systolic pressure TR Vmax + RA pressure
• Mean PA Pressure = 80 -1/2(1/2 acceleration time)
• Pulmonary Artery Pressure End Diastolic = RA pressure + 4V2 (PI)
• LVEDP = Diastolic Blood Pressure – 4V2 (AI)
• Left Atrial Pressure = Systolic Blood Pressure – 4V2 (MR)