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Year 1: Respiratory > Oxygen > Flashcards

Flashcards in Oxygen Deck (10):
1

how much oxygen is dissolved in 100ml blood?

0.3ml

2

how much oxygen is carried by haemoglobin in 100ml blood?

20.4ml

3

what is the difference between SaO2 and SpO2?

SaO2 is oxygen saturation of arterial blood, measured by taking a blood sample.
SpO2 is oxygen saturation, measure by a pulse oximeter.

4

What is PaO2?

this is the amount of oxygen dissolved in arterial blood plasma

5

what is FiO2?

fraction of inspired oxygen that patient is inhaling

6

All people with COPD are CO2 retainers. True/ False?

False. Only a third of people with COPD are CO2 retainers

7

Type 1 Respiratory Failure features

Low O2
Normal CO2

8

Type 2 Respiratory Failure Features

Low O2
High CO2

9

What makes patients retain CO2?

V/Q mismatching
Areas of poor ventilation have vasoconstriction, give oxygen and this reverses, perfusion becomes good but ventilation is still poor. (Shunt). Chronically hypoxaemic patient has low Hb sats. CO2 occupies the empty binding sites on Hb. Giving high FiO2 pushes CO2 off the Hb, into the plasma

10

Chronically hypoxaemic patients without CO2 retention can still become acidotic with too much O2. True/ False?

True
This is due to the Haldane Effect (oxygenation of blood in the lungs displaces CO2 from haemoglobin which increases the removal of CO2)