In the Modified Bernoulli equation, p2 represents:

In the Modified Bernoulli equation, p2 represents:

• A. Pressure of the distal chamber
• B. Pressure of the proximal chamber
• C. Mean gradient
• D. Flow velocity

Answer: (A)

The Modified Bernoulli equation connects the velocity through a narrowed region to the pressure drop across it. The p2 term is the pressure downstream of the obstruction, in the distal chamber. In other words, it’s the pressure on the far side of the narrowed point, while p1 is the upstream (proximal) pressure. The pressure difference driving the flow across the stenosis is p1 minus p2, and the Doppler-measured velocity through the narrowing is used in the relation ΔP ≈ 4 v^2 to estimate that gradient. So p2 specifically represents the pressure in the distal chamber downstream of the stenosis.

The Modified Bernoulli equation connects the velocity through a narrowed region to the pressure drop across it. The p2 term is the pressure downstream of the obstruction, in the distal chamber. In other words, it’s the pressure on the far side of the narrowed point, while p1 is the upstream (proximal) pressure. The pressure difference driving the flow across the stenosis is p1 minus p2, and the Doppler-measured velocity through the narrowing is used in the relation ΔP ≈ 4 v^2 to estimate that gradient. So p2 specifically represents the pressure in the distal chamber downstream of the stenosis.