Hemodynamics

Question 1

what is the mean pressure in the aorta?

Answer 1

100 mm Hg

Question 2

what is the mean pressure in large arteries?

Answer 2

100 mm Hg (120 systolic, 80 diastolic)

Question 3

what is the mean pressure in arterioles?

Answer 3

50 mm Hg

Question 4

what is the mean pressure in systemic capillaries?

Answer 4

20 mm Hg

Question 5

what is the mean pressure in the vena cava?

Answer 5

4 mm Hg

Question 6

what is the mean pressure in the right atrium?

Answer 6

0-2 mm Hg

Question 7

what is the mean pressure in pulmonary arteries?

Answer 7

15 mm Hg (25 systolic, 8 diastolic)

Question 8

what is the mean pressure in pulmonary capillaries?

Answer 8

10 mm Hg

Question 9

what is the mean pressure in pulmonary veins?

Answer 9

8 mm Hg

Question 10

what is the mean pressure in the left atrium?

Answer 10

2-5 mm Hg

Question 11

what does Reynolds Number calculate? what is the equation?

Answer 11

predicts when turbulence will occur (it will if value is greater than 2000)

NR=þ*(dv/h)

þ= density, d= diameter, v=velocity, h=viscosity

Question 12

what does Poiseuille’s Law calculate? what is the equation?

Answer 12

resistance thru a section of vasculature

R= (8hl) / (πr⁴)

h= viscosity, l=length of vessel, r=vessel radius