Bernoulli practice quiz Flashcards
If you have a mitral regurgitation peak velocity of 5 m/s, what is your pressure gradient between your left atrium and left ventricle?
100 mmHg + LAp
100 mmHg
5 mmHg
25 mmHg
100 mmHg
Correct Answer:
100 mmHg
The Doppler derived peak instantaneous velocity is the same as the catheter peak to peak gradient?
True
False
False
Estimate an LA pressure from the following information:
BP: 160/70, MR peak velocity 6 m/s
36 mmHg
160 mmHg
6 mmHg
16 mmHg
16mmHg
To estimate the left atrial (LA) pressure from the given information, we can use the mitral regurgitation (MR) peak velocity. The MR peak velocity provides an estimate of the pressure gradient between the left ventricle (LV) and the left atrium during systole.
We will use the Bernoulli equation to estimate the pressure gradient:
This pressure gradient represents the difference between the left ventricular systolic pressure (LVSP) and the left atrial pressure (LAP) during systole.
Next, we need to estimate the LVSP. The systolic blood pressure (SBP) is often used as a surrogate for the LVSP in the absence of significant aortic stenosis or other abnormalities. Here, the given systolic blood pressure is 160 mmHg.
Using the calculated pressure gradient and the estimated LVSP, we can estimate the
LAP=160 mmHg−144 mmHg=16 mmHg
Therefore, the estimated left atrial pressure (LAP) is approximately 16 mmHg.
Why is obtaining a blood pressure important in conjunction with an echocardiogram?
A. The systolic blood pressure is the same as our RV systolic pressure
B. The blood pressure allows for accurate non-invasive chamber pressure estimation and quantification of severity of PHTN
C. The higher the systolic blood pressure the greater the cardiac output
D. The blood pressure is used when calculating the BSA
D. The blood pressure is used when calculating the BSA
Estimate my RVSP using the following information: BP: 120/60, IVC diameter: 1.9 cm, >50% collapsibility TR: 2.1 m/s.
20.64 mmHg
17.64 mmHg
37.64 mmHg
27.64 mmHg
20.64 mmHg
What would be characteristic of a RA pressure of 16?
Normal diameter, inspiratory variation
Dilated diameter, >50% inspiratory variation
Normal diameter, no inspiratory variation
Dilated diameter, <50% inspiratory variation
Dilated diameter, <50% inspiratory variation
Select all that apply: If a pressure decreases _________:
The volume increases
The vessel size has narrowed
The velocity increases
The vessel size has increased
The vessel size has narrowed
The velocity increases
Which choice below best estimates the pressures within a normal adult heart’s chambers?
LA: 5, LV: 120, RA: 20, RV: 25
LA: 15, LV: 120, RA: 3, RV: 120
LA: 0, LV: 120, RA: 10, RV: 25
LA: 8, LV: 120, RA: 3, RV: 25
LA: 8, LV: 120, RA: 3, RV: 25
What is the Modified Bernoulli Equation?
ΔP=4×(TR velocity) 2
