week 8 Flashcards
Supplemental oxygen and vital signs survey and patient assessment
Diffusion (gases)
Movement of gases across semi-permeable membranes from an area of high concentration to an area of low concentration
Howis O2 supplied to the body
Oxygen diffuses into the blood through the lungs and is taken around the body.
Oxygen is transported by
Bonding to haemoglobin
What are chemoreceptors
Monitor C02, 02, pH and CSF and provide feedback to respiratory centre to modify rate and depth of breathing
Where are chemo-receptors located
in the carotid bodies and aortic arch monitor
central chemoreceptors - medullar monitor
Two parts to oxygen delivery
- The amount of O₂ being delivered, as determined by the amount available during ventilation and the body’s ability to deliver it efficiently (external and internal respiration)
- The demand by the body’s cells for oxygen, which can be affected by a large number of variables including exercise, infection, growth, temperature.
Hypoxia
A deficiency of oxygen in the tissues
Hypoxaemia
Reduction of the O₂ concentration in the arterial blood
Aerobic metabolism
The body requires O₂ to complete many of its complex chemical reactions.
Oxygen flow rates
Low flow : 2-4 litres per minute
Med flow : 6-12 litres per minute
High flow : 12-15 litres per minute
Oxygen Administration
- Nasal Cannula
- Face mask
- Nebuliser mask
- Non rebreather mask
- Bag-Valve-Mask Resuscitation
- Closed-circuit
Nasal Cannula
Delivers low flow, low concentration, supplemental
oxygen via a system of plastic tubing with two plastic tips which protrude from the centre of the tube and are
inserted into the nostrils
Simple face mask
Plastic mask (with small holes over the cheek area). For
patients suffering from impaired circulation of oxygen or from an increased need for oxygen. NOT for the
treatment of acute hypoxia.
