27 terms

Calculations

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Terms in this set (...)

Desired FiO2
Desired PaO2 x Current FiO2/Current PaO2
Air flow through entrainment mask
Sum of Air and O2 ratio x O2 liter flow
Airway resistance (spontaneous breathing)
Atmospheric pressure-Alveolar pressure/Flow
Airway resistance (MV)
Peak airway pressure-Plateau pressure/Flow in L per sec
Alveolar minute ventilation
RR x (Vt- dead space volume)
Alveolar ventilation
rr x Vt
CaO2
(Hb x 1.34 x SaO2) + (PaO2 x 0.003)
Cardiac index
Qt/BSA
Predicted cardiac output
VO2/C(a-v) O2
Tank duration
Pressure in tank in psig x cylinder factor/ liter flow
Static compliance
Exhaled Vt-Compressed volume/Pplat-PEEP
Dynamic compliance
Exhales Vt-Compressed volume/PIP-PEEP
Tidal volume
Ti x Flow
Helios factors
80-20=1.8
70-30=1.6
60-40=1.4
Heliox flow
Desired flow/heliox factor
Total cycle time
60/rr
Inspiratory time
TCT/sum of I:E ratio
Dead space percentage (Vd/Vt)
PaCO2-PeCO2/PaCO2
Deadspace volume
Dead space percentage x Vt
Ve for MV
PaCO2 x Ve/PaCO2
PAO2
[(Pb-PH2O)FiO2]-(PaCO2 x 1.25)
PVR
(PCWP/Qt) x 80
Respiratory quotient
VCO2/VO2
Shunt equation
CcO2-CaO2/CcO2-CvO2
Stroke volume
Qt/HR
SVR
(CVP/Qt) x 80
Compliance factor
Vt/pressure