Flashcards in Oxygen Deck (10):
how much oxygen is dissolved in 100ml blood?
how much oxygen is carried by haemoglobin in 100ml blood?
what is the difference between SaO2 and SpO2?
SaO2 is oxygen saturation of arterial blood, measured by taking a blood sample.
SpO2 is oxygen saturation, measure by a pulse oximeter.
What is PaO2?
this is the amount of oxygen dissolved in arterial blood plasma
what is FiO2?
fraction of inspired oxygen that patient is inhaling
All people with COPD are CO2 retainers. True/ False?
False. Only a third of people with COPD are CO2 retainers
Type 1 Respiratory Failure features
Type 2 Respiratory Failure Features
What makes patients retain CO2?
Areas of poor ventilation have vasoconstriction, give oxygen and this reverses, perfusion becomes good but ventilation is still poor. (Shunt). Chronically hypoxaemic patient has low Hb sats. CO2 occupies the empty binding sites on Hb. Giving high FiO2 pushes CO2 off the Hb, into the plasma