RTRP Notes
NOTES NA PWEDE TITIGAN,
IYAKAN, AT IDIKIT SA PADER
(P.S. RTRP NA MAY GAWA NITO)
,Oxygen Therapy Notes
Lpm FiO2 Air/O2 FiO2 to Lpm:
O2
Entrainment Lpm = (FiO2 - 20) / 4
Percentage
Ratio
Room Air Lpm to FiO2:
0
21%
FiO2 = (lpm x 4) + 20
24% 25:1
1 24%
28% 10:1
Cylinder Flow Factor
2 28%
30% 8:1 Flow
Cylinder
Factor
3 32%
35% 5:1 D 0.16
4 36%
40% 3:1 E 0.28
5 40%
M 1.56
45% 2:1
6 44%
G 2.41
50% 1:7.1
7 48%
H/K 3.14
60% 1:1
8 52%
9 58% 100% 0:1
Duration of FLOW (min)
10 60%
100 - X Parts of Air Entrained
=
X - 20 1 Part O2 Amount of gas in cylinder
11 64%
~ Use 21 instead of 20 on
percentages of less than 40%
Sample Problem
12 68% Calculate the air/O2 ratio for 35% FiO2
Duration of GAS
100 - 35 65 4.64
= = = 5:1
35 - 21 14 1
13 72%
Calculating FiO2
Magic Box Method
14 76% O2 flow + (Airflow x 0.2)
21 65 Total Flow
15 78% Desired FiO2
35 PaO2 (desired x FiO2 (current))
Only Mechanical PaO2 (current)
Ventilators can provide
100 14
100% FiO2
- Use 20 on percentages more than 40%
, Oxygen Therapy Notes
Gas Cylinder Color Coding
Gas Name Chemical Symbol US Canada
Oxygen O2 GREEN White
Carbon Dioxide CO2 GRAY GRAY
Nitrous Oxide N2O BLUE BLUE
Cyclopropane C3 H6 ORANGE ORANGE
Helium He BROWN BROWN
Ethylene C2 H4 RED RED
Carbon Dioxide + Oxygen CO2 - O2 GRAY/GREEN GRAY/WHITE
Helium + Oxygen He - O2 BROWN/GREEN BROWN/WHITE
Nitrogen N2 BLACK BLACK
Air - YELLOW BLACK/WHITE
Nitrogen + Oxygen N2- O2 BLACK/GREEN PINK
Physical characteristics of Medical Gases
NOTES NA PWEDE TITIGAN,
IYAKAN, AT IDIKIT SA PADER
(P.S. RTRP NA MAY GAWA NITO)
,Oxygen Therapy Notes
Lpm FiO2 Air/O2 FiO2 to Lpm:
O2
Entrainment Lpm = (FiO2 - 20) / 4
Percentage
Ratio
Room Air Lpm to FiO2:
0
21%
FiO2 = (lpm x 4) + 20
24% 25:1
1 24%
28% 10:1
Cylinder Flow Factor
2 28%
30% 8:1 Flow
Cylinder
Factor
3 32%
35% 5:1 D 0.16
4 36%
40% 3:1 E 0.28
5 40%
M 1.56
45% 2:1
6 44%
G 2.41
50% 1:7.1
7 48%
H/K 3.14
60% 1:1
8 52%
9 58% 100% 0:1
Duration of FLOW (min)
10 60%
100 - X Parts of Air Entrained
=
X - 20 1 Part O2 Amount of gas in cylinder
11 64%
~ Use 21 instead of 20 on
percentages of less than 40%
Sample Problem
12 68% Calculate the air/O2 ratio for 35% FiO2
Duration of GAS
100 - 35 65 4.64
= = = 5:1
35 - 21 14 1
13 72%
Calculating FiO2
Magic Box Method
14 76% O2 flow + (Airflow x 0.2)
21 65 Total Flow
15 78% Desired FiO2
35 PaO2 (desired x FiO2 (current))
Only Mechanical PaO2 (current)
Ventilators can provide
100 14
100% FiO2
- Use 20 on percentages more than 40%
, Oxygen Therapy Notes
Gas Cylinder Color Coding
Gas Name Chemical Symbol US Canada
Oxygen O2 GREEN White
Carbon Dioxide CO2 GRAY GRAY
Nitrous Oxide N2O BLUE BLUE
Cyclopropane C3 H6 ORANGE ORANGE
Helium He BROWN BROWN
Ethylene C2 H4 RED RED
Carbon Dioxide + Oxygen CO2 - O2 GRAY/GREEN GRAY/WHITE
Helium + Oxygen He - O2 BROWN/GREEN BROWN/WHITE
Nitrogen N2 BLACK BLACK
Air - YELLOW BLACK/WHITE
Nitrogen + Oxygen N2- O2 BLACK/GREEN PINK
Physical characteristics of Medical Gases
