Which method is used to estimate systolic pulmonary artery pressure in echocardiography when a tricuspid regurgitation jet is present?

Which method is used to estimate systolic pulmonary artery pressure in echocardiography when a tricuspid regurgitation jet is present?

• A. sPAP = MRV^2 × 4
• B. sPAP = TRV^2 × 4 + RAP
• C. sPAP = E/A ratio × velocity
• D. sPAP = RA pressure alone

Answer: (B)

When a tricuspid regurgitation jet is available, you can estimate systolic pulmonary artery pressure by turning the velocity of that jet into a pressure difference and then adding the right atrial pressure. The peak velocity of the TR jet gives the pressure gradient across the tricuspid valve during systole, and with the simplified Bernoulli equation ΔP = 4 × (TRV)^2. The systolic pulmonary artery pressure is then the sum of that gradient and the right atrial pressure: sPAP ≈ 4 × (TRV)^2 + RAP. The RAP is typically estimated from the inferior vena cava diameter and its collapsibility. This method is specifically used because the TR jet directly reflects the pressure difference between the right ventricle and right atrium during systole, which, in turn, equals the systolic pressure in the pulmonary artery when TR is present. If the TR jet isn’t well defined, this estimate isn’t reliable, and other methods aren’t applicable here.

When a tricuspid regurgitation jet is available, you can estimate systolic pulmonary artery pressure by turning the velocity of that jet into a pressure difference and then adding the right atrial pressure. The peak velocity of the TR jet gives the pressure gradient across the tricuspid valve during systole, and with the simplified Bernoulli equation ΔP = 4 × (TRV)^2. The systolic pulmonary artery pressure is then the sum of that gradient and the right atrial pressure: sPAP ≈ 4 × (TRV)^2 + RAP. The RAP is typically estimated from the inferior vena cava diameter and its collapsibility. This method is specifically used because the TR jet directly reflects the pressure difference between the right ventricle and right atrium during systole, which, in turn, equals the systolic pressure in the pulmonary artery when TR is present. If the TR jet isn’t well defined, this estimate isn’t reliable, and other methods aren’t applicable here.