Oxygen

Question 1

right shift incr affin

Answer 1

High temp
High 23 DPG
High H+

Question 2

Left shift decr affin

Answer 2

Low temp
Low 23 DPG
CO
Low H+

Question 3

Oxygen saturation

Answer 3

Percent of Hb bind sites in blood that are carrying O

Sats of 100 not always normal eg low Hb

Question 4

Arterial PaO2

Answer 4

Actual O content in arterial blood

Question 5

Hypoxia

Answer 5

Hypoxic- altit, hypoventil, diffus abn, pulm shunting, V/Q mism
Anaemic- low Hb or inabil to carry O
Stagnant/ circlatory- shock, hypovol, HF
Histotoxic

Question 6

goals of O therapy

Answer 6

Correct hypoxemia
Decr symps
Minim cardiopulm work

Question 7

Hypoxia symps

Answer 7

Tachyc
Tachyp
HTN
Cyanosis
Dyspnoea
Disorient
Clubbing

Question 8

method based on

Answer 8

GCS
Comfort
Level and range req FiO2
Humidification req

Question 9

Low flow

Answer 9

O diltued with air on inspirat
Lim reservoir
Inconsis concs if varying RR and TV
Eg nasal, simple face mask

Question 10

high flow

Answer 10

Predictable and consis concs
Entrainment
Eg venturi, non rebreathe, puritan

Question 11

Fixed perf devices

Answer 11

FiO2 constant

Eg O tent, anaes breathing circuit, high air flow O enrichers.

Question 12

indics

Answer 12

PO2 under 60 or sats under 90
Cardiac and resp arrest
Resp fail
HF or MI
Shock
Incr metab demand eg burn, multip inj, sepsis
Post op
CO poison

Question 13

O2 toxicity

Answer 13

Determined by pO2 and timeof expos
CNS effects if hyperbaric press
Pulm effects can occur at clinical Po2 levs- patchy low infiltrates on XR, major alv inj
Use lowest amnt req to maint adeq tiss O