Physics Mod 7 Flashcards
1
Q
Law of hemodynamics
A
P = Q x R Q = v x area R = 8ln / pir^4
2
Q
Poiseuille’s law
A
Q = deltaP pi r^4 / 8 l n
3
Q
Bernoulli’s equation simplified
A
delta P = 1/2 p(v2^2-v1^2)
4
Q
Spectral window
A
in PW doppler
region without signal
signifies laminar flow
5
Q
Doppler risetime for a diseased vessel cut off
A
> 144 msec
6
Q
Arterial signal components
A
1) rapid acceleration
2) short flow reversal cause by high resistance of distal bed
3) diastolic forward flow component
7
Q
Resistive index
A
(systolic - diastolic) / systolic
8
Q
Pulsatility index
A
(systolic - diastolic) / mean velocity
9
Q
Systolic diastolic ratio
A
Systolic / diastolic
