Cerebral Haemodynamics Flashcards

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1
Q

Measure of laminar flow

A

Reynolds number

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2
Q

Assumptions for laminar flow

A

length of tube is greater than radius
flow must be steady in time and laminar in the velocity profile
newtonian fluid
tube must be rigid

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3
Q

Reynolds number for laminar flow

A

<2000

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4
Q

Reynolds number for laminar or turbulent flow

A

2000 < Re < 4000

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5
Q

Reynolds number for turbulent flow

A

> 4000

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6
Q

relationship between reynolds number and diameter of the tube

A

proportional

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7
Q

Violations of the assumptions for pouiseuille’s law

A

high rate of branching of blood vessels
tube is not rigid
blood is non newtonian and only newtonian in at certain shear rates

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8
Q

Why can pouiseuille’s law still be applied despite all the violations of the assumptions?

A

consider the vasculature
it works for a group of blood vessels

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9
Q

Electrical equivalents of pouiseuille’s law

A

driving force: pressure vs voltage difference
current/flow: fluid flowing vs charge flowing
resistance: pouiseuille’s law vs resistance

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10
Q

Flow (Q) formula

A

pressure difference / peripheral resistance

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10
Q
A
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