Keep and Manford determined the appropriate size of an endotracheal tube to use in a child based on age, weight and height. The authors felt that selection based on height was the most accurate of the three. The authors are from St. George's Hospital in London and Queen Mary's Hospital for Children in Surrey.
Parameters:
(1) age
(2) weight in kilograms
(3) height in centimeters
|
Age of the Patient |
Endotracheal Tube (mm) |
|
6 to 8 months |
4.0 |
|
9 to 18 months |
4.0 or 4.5 |
|
19 to 23 months |
4.5 |
|
24 months (2 years) |
4.5 or 5.0 |
|
2.01 to 2.99 |
5.0 |
|
3.0 to 3.99 |
5.0 or 5.5 |
|
4.0 |
5.0 or 5.5 or 6.0 |
|
4.01 to 5.99 |
5.5 or 6.0 |
|
6.0 |
5.5 or 6.0 or 6.5 |
|
6.01 to 6.99 |
6.0 or 6.5 |
|
7.0 |
6.0 or 6.5 or 7.0 |
|
7.01 to 7.99 |
6.5 |
|
8.0 to 9.0 |
6.5 or 7.0 |
|
9.01 to 9.99 |
7.0 |
|
10.0 to 11.0 |
7.0 or 7.5 |
|
11.01 to 12.9 |
7.5 |
|
13.0 to 14 |
7.5 or 8.0 |
|
14.01 to 15 |
8.0 |
|
Weight in Kilograms |
Endotracheal Tube (mm) |
|
6-7.99 |
4.0 |
|
8-10.99 |
4.0 or 4.5 |
|
11.0 |
4.0 or 4.5 or 5.0 |
|
11.01-13 |
4.5 or 5.0 |
|
13.01-14.99 |
5.0 |
|
15-17 |
5.0 or 5.5 |
|
17.01-17.99 |
5.5 |
|
18-19.99 |
5.5 or 6.0 |
|
20-22 |
5.5 or 6.0 or 6.5 |
|
22.01-24.99 |
6.0 or 6.5 |
|
25 |
6.0 or 6.5 or 7.0 |
|
25.01-29.99 |
6.5 or 7.0 |
|
30-31 |
7.0 |
|
31.01-40 |
7.0 or 7.5 |
|
40.01-42.99 |
7.5 |
|
43-50 |
7.5 or 8.0 |
|
50.01-62 |
8.0 |
|
Height in centimeters |
Endotracheal Tube (mm) |
|
61 to 73 |
4.0 |
|
74 to 75 |
4.0 or 4.5 |
|
76 to 86 |
4.5 |
|
87 to 88 |
4.5 or 5.0 |
|
89 to 103 |
5.0 |
|
104 |
5.0 or 5.5 |
|
105 to 113 |
5.5 |
|
114 |
5.5 or 6.0 |
|
115 to 120 |
6.0 |
|
121 to 122 |
6.0 or 6.5 |
|
123 to 131 |
6.5 |
|
132 to 133 |
6.5 or 7.0 |
|
134 to 140 |
7.0 |
|
141 to 143 |
7.0 or 7.5 |
|
144 to 153 |
7.5 |
|
154 |
7.5 or 8.0 |
|
155 to 164 |
8.0 |
In Table 1 (page 182) the mean age, weight and height are listed for each endotracheal tube diameter. Equations from Minitab that approximates this data are:
endotracheal tube diameter in mm =
= (-0.006545 * ((age in years)^2)) + (0.3913 * (age in years)) + 3.736
endotracheal tube diameter in mm =
= (-0.001821 * ((weight in kg)^2)) + (0.1993 * (weight in kg)) + 2.521
endotracheal tube diameter in mm =
= (0.000067 * ((height in cm)^2)) + (0.02882 * (height in cm)) + 1.710
Specialty: Pulmonology, Emergency Medicine, Pedatrics
