Children with status asthmaticus can be assessed for clinical severity, which can be used to guide management.
(1) cyanosis or PaO2
(2) respiratory breath sounds
(3) use of accessory muscles
(4) expiratory wheezing
(5) cerebral function
inspiratory breath sounds
decreased to absent
use of accessory muscles
The original score of Wood et al used PaO2 measurement.
PaO2 in mm Hg
70 - 100 mm Hg on room air
<= 70 mm Hg on room air (FIO2 0.21)
<= 70 mm Hg on 40% oxygen (FIO2 0.40)
In the modification by Downes and Raphaely, cyanosis was used instead of PaO2:
on room air
on 40% oxygen
In the version given by Hollman et al, mild use of accessory muscles and mild expiratory wheezing were both scored at 0.5 points.
• minimum score: 0
• maximum score: 10
• The scores correlates directly with PaCO2 and inversely with PaO2 on room air.
PaCO2 in mm Hg
Risk of Respiratory Failure
5 - 7
55 - 75
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Purpose: To clinically assess children with status asthmaticus for the severity of their symptoms.
Objective: severity, prognosis, stage