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Oxygen therapy (Administration (Resevoir
non-rebreathe (Method
O2…
Oxygen therapy
Administration
Resevoir
non-rebreathe
Method
O2 delivery determines by inflow and flap valves (max 15L/m)
Inflate resevoir bag, this allows mask to match inspiratory requirement with no need for supplemental external air
Flap valves aid expiratory air removal to reduce rebreathing and
prevents expired air going into the bag
Advantages and disadvantages
Advatnages: O2 delivery 60-90%
Disadvantages: short term, imprecise
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Nasal specs
Method
Flow rate roughly defined O2 concentration
Run on 2-4L/min, unpleasant by 6L/min
Advantages and disadvantages
Advantages: allows patient to eat
Disadvantages: relies on nose breathing, variable O2 delivery,
nasal soreness
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Venturi
Method
Low flow of high-pressure air enters venturi, entrains
with normal air to create precise O2 concentration
Types
Blue (24%), white (28%), yellow (35%), red (40%), green (60%)
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Cylinders
Medical O2: white
Medical N2O: dark blue
Medical air: black and white
Entonox: dark blue and white
Indications
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Acute illness
Respiratory disease e.g. pneumonia, asthma, COPD
Cardiac disease e.g. HF, arrhythmias, MI
Metabolic acidosis
Hypotension
Principles
Titration
Guided by clinical state and SaO2 (94-98%,
or 88-92% if CO2 retainer)
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Definition
Provision of additional concentration
of oxygen compared with inspired air
to aid oxygenation in patients