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principles of mech vent
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vd/vt formula
paco2 - peco2 / paco2
less than 60% shows normal function
ventilation in excess of perfussion
dead space ventilation
anatomic
alveolar
physiologic
normal range for dynamic compliance
30-40 ml/cmh20
normal range static compliance
40-60 ml/cmh20
upward shift in p-v loop
high compliance
wont see enough
emphysema pt cause of blebs not enough recoil
downward shift in p-v loop
low compliance
3 conditions showing low dynamic comp
bronchospasm
kinking of ett
airway obstruction
measure elastic resistance of airway lung and chest wall
dynamic compliance
3 conditions showing low static compliance
ards
atelectasis
tension pneumothorax
measure elastic resistance of chest wall and lungs
static compliance
tubing volume formula
change Pressure x .3 ml/cmh20
dynamic compliance formula
vt/ (peak-peep)
measure the pressure in the pt's lungs W/ AIR FLOW
dynamic compliance
static compliance formula
vt/ (ppl - peep)
measureing the stretchyness of pt's lung W/OUT AIR FLOW
static compliance
how stretchy or stiff your lungs are
lung compliance
volume change per unit of pressure change
bowing could occor on
either side or both
resistance can be seen on
p-v loop
pressure volume loop: if u see increase resistance =
increase bowing of the loop
-bowing exp (bronchospasms)
flow obstruction of the airways
airway resistance
normal resistance range @ a flow of 30 lpm
.6 - 2.4 cmh20/l/sec
4 factors influencing resistance
airway
tube
circuit
lungs
if you cut the length of tube, you cut
resistance
RAW - resistance formula
raw= change pressure/flow
change in pressure = (pip - ppl)
Author
imatissa
ID
43298
Card Set
principles of mech vent
Description
exam 2
Updated
2010-10-19T06:12:37Z
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