13. Respiratory physiology Flashcards by Luis Vegas

Q

PaO2 in mithochondria

A

10 mmHg (4-22)

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Q

Volume Capacity

A

End Respiratory Volume + Tidal Volume

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Q

Funtional Residual capacity

A

End respiratory volume + Residual Volume

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Q

PaO2 in CO intoxication

A

PaO2 normal

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Q

FRC from standing to lying down

A

Decrease in one liter

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Q

ARDS hypoxemia

A

Due to shunt

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Q

Why hypoxemia in elderly?

A

Due to increase closing capacity above FRC

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Q

Whats closing capacity?

A

Closing volume + Residual Volume

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Q

CaO2 formula

A

1.34xHbxSat + 0.003xPaO2

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Q

Aa gradient

A

PAO2 - PaO2

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Q

PAO2 formula

A

FiO2 x (760-47) - PCO2/0.8

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Q

Changes in methilhemoglobilemia

A

PaO2 normal
Decrease Sat O2, DO2

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Q

Changes in CO poisoning

A

Shift to the left
Conformational changes in Hb

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Q

Anatomic dead space

A

100 - 150 ml

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Q

VD/VT in COPD

A

Up to 0.9 . Hyperventilation to compensate

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Q

Whats the problem in emphysema

A

Loss of elastic tissue. Issue with expirium

Q

Transpulmonary pressure

A

Driving force
PAW - PPL
In healthy PAW = 0

Q

Resistance of the respiratory system

A

Increase in large airways
Turbulent
Smaller lung volume, Higher resistance

Q

O2 content minimum and maximum

A

Mith < SVC < IVC < PA

Q

FRC changes

A

Increase with Age and Height
Decrease in women and fat

Q

Expiratory flow rate in restrictive

A

Increase

Q

What’s driving pressure

A

PPL (pleural pressure)

Q

Zone 3 vs zone 4 blood flow

A

Lower in zone 4 due to compression on vessels