Values Flashcards
PW can’t measure high velociraptor but what can it measure up to?
> 2.0-2.5 m\s
PW will aliase if …?
Exceed the nyquist limit,
1/2 PRF
MR flow is about how fast
5-7 m/s
A 20 degree offset from flow direction = —% underestimation of blood flow velocity
6%
When arrhythmias are present how many beats should be measured to be able to average the velocities
3-5 beats
If the velocities exceed —- then the expanded Bernoulli equation should be used
_> 1.2 m/s
If a stenosis is longer then —- then it starts to affect the estimation of pressure gradients
> 10 mm
The baseline should be — from top or bottom
3/4 ways
The useful part of the spectral should occupy how much of the total scale
1/2-3/4
In a stenosis if the area reduces by half, what happens to the speed
Doubles
Aorta systolic pressure
120 mmHg
Aorta diastolic pressure
70 mmHg
Mean aorta pressure
85 mmHg
Mean Right atrial pressure
4 mmHg
Systolic right ventricle pressure
25 mmHg
Diastolic right ventricle pressure
4 mmHg
Systolic left ventricle pressure
120 mmHg
Diastolic left ventricle pressure
10 mmHg
Mean Left atrium pressure
10 mmHg
PA systolic pressure
25 mmHg
PA diastolic pressure
10 mmHg
PA mean pressure
16 mmHg
Normal Parasternal EF
_> 55%
Normal FS
> 25%