Hemodynamics

Question 1

What does the Poiseuille equation represent?

Answer 1

Relationship between Q (flow), P (pressure) and R (resistance )

Question 2

What are the determinants of Resistance ?

Answer 2

1. r = radius
2. V = viscosity
3. L = Length of the vessel

Question 3

Place of GREATEST RESISTANCE in systemic circulation?

Answer 3

1. Arterioles !

Question 4

What is the site of the arterioles (greatest resistance) called when talking about systemic pressures?

Answer 4

1. Total Peripheral Resistance (TPR)
   Or
2. Systemic Vascular Resistance (SVR)

Question 5

TPR/SVR represents what, to the heart?

Answer 5

1. Afterload

Question 6

What is Viscosity?

Answer 6

A fluid’s internal property for resistance to flow

Question 7

⬆️ Viscosity = ?

Answer 7

⬆️ Resistance / ⬇️ Flow

Question 8

⬇️ Viscosity = ?

Answer 8

⬇️ Resistance/ ⬆️ Flow

Question 9

⬆️ Length = ?

Answer 9

⬆️ Resistance

Question 10

⬇️ Length = ?

Answer 10

⬇️ Resistance

Question 11

This number calculates Turbulence ?

Answer 11

1. Reynold’s number

Question 12

Characteristics that PROMOTE TURBULENT FLOW?

Answer 12

1. Large Diameter.
2. High Velocity.
3. Low Viscosity (anemia)
4. Branching of arteries
5. Severe stenosis

Question 13

What is vessel compliance ?

Answer 13

The property of a vessel to be STRETCHED

Question 14

Place of largest compliance in systemic blood?

Answer 14

1. Veins

Question 15

% of systemic blood volume in veins?

Answer 15

1. 70%

Question 16

What is LaPlace relationship for?

Answer 16

Calculating Wall Tension (T).

Question 17

Wall Tension (T) depends on what 2 factors?

Answer 17

1. Pressure

2. Radius