Ventilation/Perfusion Ration Flashcards
Air goes in & out
Ventilation
blood goes round & round
Perfusion
dynamic relationship between the amount of ventilation the alveoli receive & the amount of perfusion through the capillaries surrounding the alveoli
Ventilation/Perfusion (V/Q) Ratio
Normally the______have more ventilation than perfusion
Upper lungs
Normally the______have more perfusion than ventilation
Lower lungs
Normally we have more ____than ____.
perfusion, ventilation.
Normal SpO2 =
95-97%
amount of air & pressure inside the alveoli & the pressure of the blood flowing through the capillary bed
Pressure Imbalances
If the pressure in an alveolus exceeds the blood pressure in the capillary bed, blood flow through the capillary will what?
stop
If blood pressure drops, the alveolar pressure can impede blood flow. This will result in:
poor pulmonary perfusion (hypoxemia)
A disturbance on the ventilation side of the ventilation/perfusion ration can lead to
Hypoxia
An example of a pt. having a ventilator disturbance is a pt. that’s having an
Asthma Attack
- Not enought blood to pick up the oxygen available in the alveoli
- No hemoglobin
Perfusion disturbance
the loss of the ability of the blood to carry O2
Anemia
Oxygen is transported by the blood in 2 ways:
- dissolved in plasma
2. attached to hemoglobin
once an oxygen molecule binds with hemoglobin, it is referred to as
oxyhemoglobin
A hemoglobin molecule that has no oxygen attached is referred to as
deoxyhemoglobin
hemoglobin is a protein inside the
RBC
one hemoglobin molecule carried how many o2 molecules?
4 o2 molecules
oxyhemoglobin color?
bright red
deoxyhemoglobin color?
dark red
1 oxygen molecule is attached to the hemoglobin molecule, it will have what % saturation?
25% saturation
4 oxygen molecule is attached to the hemoglobin molecule, it will have what % saturation?
100% saturation
Carbon dioxide is transported in the blood in 3 ways:
- 7% plasma
- 23% hemoglobin
- 70% bicarbonate
