Vent Equations

Question 1

Compliance Calculation

Answer 1

Vt/(Pplat-PEEP)

Question 2

Resistance Calculation

Answer 2

R=(PIP-Pplat)/Flow

Flow is measured in L/sec

Question 3

Minute Volume Calculation

Answer 3

MV=Rate x Tidal Volume

Question 4

TCT with RR

Calculation

Answer 4

TCT=60/RR

Question 5

Ti Calculation

Answer 5

Vt/Flow

Vt is measured in L

Flow is measured in L/sec

Question 6

Te Calculation

Answer 6

Te=TCT-Ti

Question 7

I:E Calculation

Answer 7

I:E=Ti/Ti:Te/Ti

Question 8

FiO2 Required

Calculation

Answer 8

(PaO2 Desired * FiO2 Present) / PaO2 initial ABG

Question 9

New PaCO2 Desired

Calculation

Answer 9

New PaCO2 Desired = Present PaCO2 – [ (pH Goal – pH Present) / 0.01}

Question 10

MV required Calculation

Answer 10

MV required = (PaCO2 Initial * MV) / PaCO2 desired

Question 11

PIP Calculation

Answer 11

(R X flow) + (Volume / compliance) + PEEP