Parameter | Class I | Class II (mild) | Class III (moderate) | Class IV (severe) |
---|---|---|---|---|
Approximate blood loss | < 15% | 15–30% | 31–40% | > 40% |
Heart rate | ↔ | ↔/↑ | ↑ | ↑/↑↑ |
Blood pressure | ↔ | ↔ | ↔/↓ | ↓ |
Pulse pressure | ↔ | ↓ | ↓ | ↓ |
Respiratory rate | ↔ | ↔ | ↔/↑ | ↑ |
Urine output | ↔ | ↔ | ↓ | ↓↓ |
Glasgow coma scale score | ↔ | ↔ | ↓ | ↓ |
Base deficit* | 0 to − 2 mEq/L | − 2 to − 6 mEq/L | − 6 to − 10 mEq/L | − 10 mEq/L or less |
Need for blood products | Monitor | Possible | Yes | Massive transfusion protocol |