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Semester 2 Equations

All Semester 2 RT equations

Time Constant Kt= CL x Raw
Stroke Volume SV= C.O./H.R. Normal: 60-130 mL
SVR (Systemic Vascular Resistance) SVR= MAP-CVP/CO X 80 Normal: 800-1500 dynesxsec
PVR (Pulmonary Vascular Resistance) PVR= MEAN PAP-PCWP/CO X 80 Normal: 120-240
Total Oxygen Delivery Do2= C.O. x (CaO2x10)
Oxygen Extraction Ratio O2 E.R.= CaO2-CvO2/CaO2
Shunt Calculation CcO2-CaO2/Cco2-CvO2; then multiply by 100 for a %
Deadspace VD/Vt= PaCO2-PECO2/PaCO2
Minute Ventilation VE= RR X VT
A-a gradient PAO2= FIO2 x (PB-47)-PaCO2/0.8 or PAO2= FIO2 x (PB-47)-PaCO2 if FIO2 greater than 60% don’t use 0.8 or shortcut FIO2 x 7 – CO2; then subtract from given PaO2.
Static Compliance Plat-Peep/VT
Dynamic Compliance Peak-Peep/Vt
Resistance Peak-plat/flow
P/F ratio PaO2/FiO2
Total Cycle Time (I:E RATIO) Ti-Te= TCT TCT-Ti=Te TCT-Te=Ti
Created by: melbell88