vent failure

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2 oxygen failure
- hypoxemia
- -low 02 levels in arterial blood
- hypoxia
- - tissue
normal shunt

less than 10%
blood in excess of 02

intrapulmonary shunting
amt of ventilation in relation to the amount of pulmonary blood flow

v/q mismatch
decrease in diffusion of 02 & c02 across the alveolar-capilarry membrane due to

change in pressure gradiants
3 hypoxic hypoxia
- increase altitude
- decrease barometric pressure
- decrease inspired 02 tension
seen by a decrease in alveolar ventilation

hypoventilation
VA formula

vt - vd

inadequate blood flow
amount of vt that is used in gas exchange

alveolar vol = Va
poiseullle's law

pressure x16 to maintain flow if airway reduced by half