Haemodynamics

Question 1

What is haemodynamics?

Answer 1

Study of blood flow

Question 2

What are the 2 types of flow?

Answer 2

Laminar

Turbulent

Question 3

What is laminar blood flow?

Answer 3

Blood flows in streamlines with each layer of blood remaining the same distance from the wall

Question 4

What is turbulent blood flow?

Answer 4

Blood flowing in all directions in the vessel

Question 5

What can cause turbulent blood flow?

Answer 5

Rate of blood flow becomes too great
Passes an obstruction in the vessel
Makes a sharp turn 
Passes over a rough surface
Increased resistance to blood flow

Question 6

What is pulse pressure?

Answer 6

Difference between systolic and diastolic pressure

Question 7

How is pulse pressure calculated?

Answer 7

Peak systolic pressure - end diastolic pressure

Question 8

How is mean arterial pressure calculated?

Answer 8

Diastolic pressure + 1/3 pulse pressure

Question 9

What happens when mean arterial pressure falls below 70mmHg?

Answer 9

Organ perfusion is impaired

Question 10

What determines the strength/volume of the pulse?

Answer 10

Force with which LV ejects blood

Pulse pressure

Question 11

What can cause a low volume pulse?

Answer 11

LV failure
Aortic stenosis
Hypovolaemia

Question 12

How is a low volume pulse described?

Answer 12

Thready

Question 13

How is a high volume pulse described?

Answer 13

Bounding