9. Oxygen delivery and hypoxia Flashcards by idhil Unknown | Brainscape

Q

Reduced ventilation e.g. brain injury

A

↓ PAO2
↓ PaO2
↓ CaO2

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Q

Increased fluid barrier in the lungs (pulmonary

oedema)

A

↓PaO2

↓CaO2

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Q

Damaged circulatory system

A

↓ CO

↓ DO2

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Q

Increased tissue fluid barrier

A

↓ PtO2 (tissue PO2)

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Q

DO2 equation

A

CaO2 xCO

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Q

CaO2 equation

A

SaO2 x[Hb]x1.34x10

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Q

SaO2 is proportional to

A

PaO2

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Q

Hypoxic hypoxia

A

• PO2 of arterial blood reduced

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Q

Anaemic hypoxia

A

• PaO2 normal but [Hb] reduced

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Q

Stagnant or ischaemic hypoxia

A

• PaO2 and [Hb] normal but blood flow low

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Q

Histotoxic or cellular hypoxia

A

• Tissue DO2 normal but cells cannot use O2 due to a toxic factor

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Q

Altitude

A

Hypoxic hypoxia

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Q

Trauma

A

Anaemic hypoxia

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Q

Cardiac failure

A

Stagnant or ischaemic hypoxia

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Q

Sepsis / poisoning

A

Histotoxic or cellular hypoxia

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