Persing chap 1
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“H” cylinder =
“E” cylinder =
- “H” cylinder = 3.14 L/ psig
- “E” cylinder = 0.28 L/ psig
Calculating how long cylinder contents will last:
- Cylinder pressure x Cylinder factor
- flow rate
How much O2 will a H and E tank hold?
The “H” cylinder holds 244 cu ft (6900 L) of O2.
The “E” cylinder, used for transport, holds 22 cu ft (622 L) of O2.
How to calculate flow for liquid O2
One liter of liquid oxygen weighs 2.5 lb (1.1 kg).
multiply 344 x # of pounds
Indications for O2 therapy
- 1. Hypoxemia
- 2. Labored breathing or dyspnea
- 3. Increased myocardial work
Signs and Symptoms of Hypoxemia
- 1. Tachycardia
- 2. Dyspnea
- 3. Cyanosis (unless anemia is present)
- 4. Impairment of special senses 5. Headache
- 6. Mental disturbance
- 7. Slight hyperventilation (tachypnea)
Age (yr) Normal PaO2
4 types of Hypoxia
- Hypoxemic hypoxia
- Anemic Hypoxia
- Stagnant circulatory hypoxia
- Histotoxic Hypoxia
Hypoxemic Hypoxia characteristics
- Caused by lack of O2 in the blood
- alveolar hypoventilation
- diffusion defects
- v/q mismatch
- right to left shunt
what should be done for a patient who is hypoxic but is ventilating well (normal or low PaCO2)
What is the exception?
- Place patient on CPAP
- if the question states that the patient has hypotension, a low cardiac output, or an elevated intracranial pressure level. Positive pressure should not be administered because the increased intrathoracic pressure. may worsen these conditions. Thus in these situations, increase the FiO2.
- Decreased Hb levels
- CO poisoning
- Excessive blood loss
Stagnant (circulatory) Hypoxia
characteristics and causes
- The O2 content and carrying capacity is normal but capillary perfusion is diminished.
- (1) Decreased heart rate (2) Decreased cardiac output (3) Shock (4) Embolism
- The oxidative enzyme mechanism of the cell is impaired as a result of (O2 is there perfusion is good but cell unable to process the o2 and use)
- (1) Cyanide poisoning (2) Alcohol poisoning
Normal Inspiratory flow rate
Nasal Cannula flow rate and FiO2
Delivers 24% to 40% O2 at flow rates of 1 to 5 L/ min (at about a 4% increase for every 1-L/ min increase).
Simple O2 mask FiO2 and Liter flow
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