Alveolar air equation (PA02)?
PA02=[(Pb-47)FI02]-PaC02/.8
Cc02?
(Hgb x 1.34 x 1) + (.003 x PA02)
Cv02?
(Hgb x 1.34 x Sv02) + (.003 x Pv02)
Humidity Deficit?
43.8 mmhg - given humidity
Relative Humidity?
Absolute/Potential x 100
Tank duration?
E cylinder = PSI x .28/LPM
H cylinder = PSI x 3.14/LPM
Shunt equation?
Qs/Qt = Cc02-Ca02/Cc02-Cv02
or
PA02-Pa02 x .003 / PA02-Pa02 x .003 + AV difference
Total Flow?
40% and above use 20, 40% and below use 21 in magic box.
Add the ratio numbers
Times by the flow
02 Content (Ca02)?
Ca02 = (Hgb x 1.34 x Sat) + (.003 x Pa02)
P(A-a)02 gradient?
PA02 - Pa02
I:E Ratio
Vt/It=peak flow/60
TT=IT+ET
TT=60/RR
RR=60/TT
AV difference
CaO2-CvO2
Static compliance (ESC)
Vt / (Plateau pressure - PEEP)
Units: ml/cmh20
Dynamic compliance
Vt / (Peak pressure - PEEP)
Units: ml/cmh20
RAW
(Peak pressure - Plateau pressure)/ Flow (L/Sec)
Convert L/Min to L/Sec by L/Min / 60
Units= cmH2O/L/Sec
Minute Ventilation
Vt x RR
Alveolar Minute Ventilation
(Vt - Dead space) x RR
Catheter size for ET tube
1/2 of a size ET tube x 3
(Use next size up if answer isnt there)
Ideal Body weight
5'=100 lbs, every 1" after add 5 lbs
Dynamic Pressure is also what?
PIP
Static pressure is also what?
SIP and Plateau pressure
Frequency
60 / time of inspiration and expiration in secs
Vd/Vt
[(PaC02-PeC02) / PaC02 ] x 100 = percent
Percent x Vt = Vd
Ideal Pa02
105 - (age/2)
Circuit compression factor
Expired volume/PIP after wye on vent is occluded
Circuit compression volume
PIP-PEEP x Circuit compression factor
Corrected tidal volume
Expired volume - circuit compressible volume
Lung compliance
change in Volume / change in Pressure
Expected Pa02
Fi02 x 5
Weaning parameters
5 ml x kg= needed Vt
or 10 mg x kg =needed VC
NIF or MIP >-20.
Rapid Shallow index < 100 *Resp. Rate and MV must be stable
Pack year
years smoking x Packs per day
Qt (cardiac output)
V02/ (A-V) x 10stroke volume x HR
Rapid Shallow Breathing index
RR/Vt (in liters)
V02 and/or CO
VO2 = Q (CaO2 - CvO2)10
Q= V02/(Ca02 - Cv02)10
Hematocrit
Hb x 3
80:20 HE flow
02 flow x 1.8
70:30 HE flow
02 flow x 1.6
Cardiac index
CI= CO/Body surface area