Patient selection: extremely premature infant from 23 to 33 weeks of gestation
Parameters:
(1) gestational age in weeks from 23 to 33 (completed week, as integer)
(2) pre-extubation FIO2 as a percent (from 21 to 100)
(3) highest respiratory severity score (RSS) in first 6 hours of life (mean airway pressure in cm water times FIO2 as decimal fraction, from 1 to 21)
(4) extubation day of life
(5) pre-extubation arterial blood gas pH (odds ratio 1.68 per increase in pH of 0.1)
(6) weight at extubation in grams
|
Parameter
|
Points
|
|
gestational age in weeks
|
0.40635 * (gestational age)
|
|
percent oxygen
|
-0.0701 * (percent oxygen)
|
|
respiratory severity score
|
-0.1273 * (respiratory severity score)
|
|
extubation day of life
|
0.04202 * (day of life)
|
|
arterial blood gas pH
|
0.52154 * 10 * (pH)
|
|
weight at extrubation in grams
|
0.0016 * (weight)
|
X =
= SUM(points for all 6 parameters) - 47.379
probability of successful extubation =
= 1 / (1 + EXP((-1) * X))
