# respiratory math

### 30 terms by Fweeks

#### Study  only

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### LUNG COMPLIANCE

Plat-Peep / Vt

Currant Rate * Currant PaCo2 / Desired PaCo2

### DESIRED VE

Currant PaCo2 * VE / Desired PaCo2

### DESIRED VENT RATE

Desired Vent Rate * Currant Vent Rate / VE

(Vt- VD) RR

Vt * RR / 1000

### VENT TUBING CALCULATION

Volume / Pressure

PaO2 / Fio2

### ALVEOLAR AIR EQUATION

Fio2(Bp-47) - (Paco2 * CF)
Bp= 760
CF= 1.25 for and

PAo2-Pa02

### IDEAL BODY WEIGHT

MALE: 50kg for first 60" then add 2.3kg/inch over
BABE: 45kg for first 60" then add 2.3 kg/imch over

### TO CHANGE PH IMMEDIATLY, WHAT LEVEL DP YOU CHANGE PaCO2

Desired PH-Currant PH then divide answer by .008

### VENT SETTING FOR VE

Middle of Vt * Vent Rate

### CYCLE TIME

Divide Cylce time into 60 to get Rate

### E CYLINDER

E Cylinder= 2200psi
Psi * .28 / Liters / Minute
Remember there is the safety of 500psi to subtract from the 2200

PaCo2-PeCo2 / PaCo2

### ARTERIAL OXYGEN CONTENT

(Sao2 Hb 1.34) + (Po2 * 0.003ml)

### RAW

PIP-Plat/ Flow Rate, Then take Flow rate and divide into 60.

### VT CORRECTION FOR UNCOMPENSATED VENT

VT - ( TF * [pip - peep]
TF= 3

### WEIGHT TO KG

wt / 2.2 8 12
8 and 12 are NBRC Guidelines

multiply by 2.2

Divide by 2.2

### FiO2

Air L/minute
O2L/minute
RA= .21 medical air= .21
(step one) Multiply .21 by Air L/m then add O2 L/m to that. (step 2) Add the original Air and O2 together. Take that anwer and divide it in to the Multiplied answer that was first done (step one)

### LIQUID O2

(cylinder full - cylinder empty)* 860L/KG

### LIQUID WEIGHT OF O2

344 is the constant
Multiply the constant by the weight then divide by the liter flow. Take that answer and divide by 60 to get liters/hours

Done in minutes

done in hours

### INSPIRATORY TIME

60 seconds in one minute = the constant
1. Rate divided by 60
2. Add I:E Ratio together (1:3= 1+3=4)
3. Divide the answers together to get inspiratory time

### EXPIRATORY TIME

Take E time from the I:E Ratio and multiply it by the inspiratory time

Example: