Oxygen Saturations (pulse oximetry)

Question 1

Pulse oximetry and its relationship with PAO2

Answer 1

Arterial,saturation has a relationship with actual arterial oxygenation, 92% saturation correlates with adequate arterial oxygenation
Less than 90% correlates with hypoxaemia

Question 2

How do you use pulse oximetry in clinical practice

Answer 2

Sensor attached to finger (pulsating arteriolar bed)
Gives instant feedback of arterial oxygen saturation
Assessment tool- pre treatment, during treatment
Outcome measure- post treatment

Question 3

What are some potential problems of pulse oximetry

Answer 3

Sensor affected by movement, nicotine stains, bruising, clubbing, nail polish
Compromised by- low bp, cold peripheries, hypothermia, peripheral vascular disease, anaemia

Question 4

What’s an ABG

Answer 4

A diagnostic test performed on blood taken from an artery, gives info on the acid base balance and the oxygenation of arterial blood, changes in respiratory mechanics and changes in the respiratory system that impedes diffusion results in a change in the levels of oxygen and carbon dioxide in the blood, changes to the renal system will also bicarbonate levels