Signs | 0 | 1 | 2 | 3 |
---|---|---|---|---|
Suprasternal muscle contraction | Absent | Present | ||
Scalene muscle contraction | Absent | Present | ||
Air entry* | Normal | Decreased at bases | Widespread decrease | Absent/minimal |
Wheezing* | Absent | Expiratory only | Inspiratory and expiratory | Audible without stethoscope/silent chest with minimal air entry |
O2 saturation | ≥95% | 92%-94% | <92% |