Hemodynamics

Question 1

Difference of pressure from high to low is called?

Answer 1

Pressure Gradient

Question 2

What position is a patient in when their hydrostatic energy is 0mmHg at the ankle?

Answer 2

Supine

Question 3

What position is a patient in when their hydrostatic energy is 100mmHg at the ankle?

Answer 3

Standing

Question 4

What position is a patient in when their hydrostatic energy is a negative number; such as, -50mmHg?

Answer 4

Standing with arms raised

Question 5

When resistance is increased, what happens to volume flow?

Answer 5

Volume flow decreases

Question 6

Vessel resistance is caused by diameter (size), vessel length, blood viscosity, vessel wall elasticity, and how tortuous the vessels are. Which one of these has the biggest effects on resistance?

Answer 6

Vessel diameter/radius

Question 7

What hemodynamic law describes the relationship of resistance, pressure gradient, and flow?

Answer 7

Poiseuille’s Law

Question 8

When the radius is decreased, what happens to volume flow?

Answer 8

Decrease in volume flow

Question 9

What organ controls our pressure gradient?

Answer 9

The heart

Question 10

What part of our circulatory system has vaso-motor tone, which means they can change their size to meet the demands of the vascular bed?

Answer 10

Arterioles

Question 11

Does high diastolic flow indicate a vaso dilated or vast constricted vascular bed?

Answer 11

Vaso dilated vascular bed

Question 12

What are the three causes of vaso constriction, which increases resistance?

Answer 12

Cold, stress, smoking

Question 13

What are the three causes of vaso dilation, which decreases resistance?

Answer 13

Heat, exercise, stenosis

Question 14

What law describes the hemodynamics that occur with stenosis?

Answer 14

Law of Conservation of Mass
V=Q÷A

Question 15

What describes the relationship of pressure and velocity when radius changes?

Answer 15

Bernoulli Effect

Question 16

When velocity increases, what happens with the pressure?

Answer 16

The pressure decreases

Question 17

Does the pressure gradient have a direct or indirect relationship?

Answer 17

Direct.
When pressure gradient increases volume flow/flow rate, also increases

Question 18

Does resistance have a direct or inverse relationship with volume flow?

Answer 18

Indirect.
Increase resistance decrease volume flow

Question 19

Does a larger radius increase or decrease resistance?

Answer 19

Decreases resistance

Question 20

Does an increase in viscosity increase or decrease resistance?

Answer 20

Increases resistance

Question 21

Does volume flow and resistance have an inverse relationship?

Answer 21

Yes.

Question 22

Is velocity part of Poiseuille’s law?

Answer 22

No