Several measures of pulmonary function change with growth of a child. Using the ulna as a growth measure is useful in a child whose height is difficult to measure. The authors are from the Royal Children's Hospital and University of Melbourne in Australia.
Subject selection: children aged 7-18 years
Parameters:
(1) gender
(2) age in years
(3) ulnar length in cm
Measurement of ulna:
(1) The left arm is rested on a table with palm down and the elbow bent at 90°.
(2) The distance from the distal lateral end of the ulna at the wrist to the proximal end at the elbow is measured with calipers.
FEV1 in liters =
= EXP(X)
FVC in liters =
= EXP(Y)
mid-expiratory flow rate (MMEF) in liters per second =
= EXP(Z)
Value |
Gender |
Equation |
---|---|---|
X |
male |
(0.071 * (ulna length in cm)) + (0.046 * (age in years)) - 1.269 |
|
female |
(0.072 * (ulna length in cm)) + (0.041 * (age in years)) - 1.272 |
Y |
male |
(0.077 * (ulna length in cm)) + (0.041 * (age in years)) - 1.285 |
|
female |
(0.078 * (ulna length in cm)) + (0.037 * (age in years)) - 1.315 |
Z |
male |
(0.060 * (ulna length in cm)) + (0.053 * (age in years)) - 1.013 |
|
female |
(0.053 * (ulna length in cm)) + (0.054 * (age in years)) - 0.806 |
from Table 3, page 807
Purpose: To estimate pulmonary function parameters for a child 7-18 years old using ulnar length, age and gender in the equations of Gauld et al.
Specialty: Pulmonology
Objective: clinical diagnosis, including family history for genetics, other testing, severity, prognosis, stage, complications
ICD-10: J20-J22, J40-J47, R94.2,