Airway Resistance Flashcards

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1
Q

Reynold’s number

A

Predicts whether flow will be laminar or turbulent

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2
Q

Formula for Reynolds number

A

Vpd/n

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3
Q

Hagen poiselle eqn

A

/_\P.pie.r4/8.l.u

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4
Q

Change in pressure equals

A

Flow x resistance

Therefore resistance varies inversely with fourth power of radius

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5
Q

Which airways have the highest resistance

A

Medium sized airways

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6
Q

Greatest resistance in?

A

Upper airways, first 7 generations

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7
Q

In regulation of airway diameter, parasympathetic innervation…?

A

Mediates bronchoconztriction

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8
Q

Sympathetic innervation?

A

Mediates bronchodilation,

Beta 2 adregenic receptors
Beta 2 agonists eg salbutamol/ salmeterol
Epinephrine

Why you should apply selective beta blockers to asthmatic pstirnyd bc it can block beta 2 receptors will will block respiratory airways

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9
Q

Histamine in regulation of airways works how?

A

H1 stimulation leads to bronchoconstrivyion
H2 stilumayion leads to bronchodilation

You should not administer beta 2 blockers to asth

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10
Q

Density of gas has no effect on resistance when airflow is..

A

Laminar

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11
Q

Patients with upper airway obstruction have more

A

Turbulence than laminar flow
Heliox useful than regular air because it has low density and since density is important in turbulent flow and turbulent flow in upper airway extraction

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12
Q

Volume flow rate equals

A

Cross sectional area × velocity

Area increases down tracheobronvhial trea. Velocity therefore drops since volume glow rate is nearly constant

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13
Q

At generation 16/17 gas movement is by

A

Diffusion(terminal bronchioles and alveoli)

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14
Q

Compliance is

A

Change is lung volume per unit pressure

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