Hemodynamics

Question 1

Flow=

Answer 1

Velocity x cross sectional area of vessel.

Question 2

Velocity=

Answer 2

Flow / Cross sectional area

Question 3

Is velocity directly or inversely related to cross-section area?

Answer 3

Inversely

Question 4

Ohm’s Law As it relates to hemodynamics

Answer 4

Q=(Pa-Pv)/R
Where Q=flow
Pa=Mean arterial pressure.
Pv=CVP
R=SVR

Question 5

Is flow (Q) directly or inversely related to SVR (R)

Answer 5

Inversely.

As SVR goes up, Flow (CO) goes down. As SVR decreases, CO will go up

Question 6

Cerebral Perfusion Pressure (CPP) =

Answer 6

Mean Arterial Pressure (MAP)- Central Venous pressure(CVP) or Intracranial Pressure (ICP) ..*whichever is greater**

Question 7

Coronary Perfusion Pressure=

Answer 7

Diastolic Pressure- LVEDP

Question 8

Is flow directly or inversely related to length of the tube?

Answer 8

Inversely. As length increases, flow will decrease.

Question 9

Is flow directly or inversely related to the viscosity of the fluid?

Answer 9

Inversely.

As viscosity is decreased, flow will increase.

Question 10

Systemic Vascular Resistance (SVR)=

Answer 10

(MAP-CVP)/CO
Then the whole number x80.

Normal is 700-1600

Question 11

Effects of turbulence on pressure-flow relationship.

Answer 11

Turbulence decreases flow at any given perfusion pressure.