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| ===Classes of [[hemorrhagic shock]]<ref>American College of Surgeons Committee on Trauma. Shock: in Advanced Trauma Life Support: Student Course Manual, ed 10. 2018. Ch 3:62-81</ref>===
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| {| class="wikitable"
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| ! Class
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| ! I
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| ! II
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| ! III
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| ! IV
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| |-
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| | Approximate blood loss
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| | <15%
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| | 15-30%
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| | 30-40%
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| | >40%
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| |-
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| | Heart rate
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| | ↔
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| | ↔/↑
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| | ↑
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| | ↑↑
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| |-
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| | Blood pressure
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| | ↔
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| | ↔
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| | ↔/↓
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| | ↓
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| |-
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| | Pulse Pressure (mmHg)
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| | ↔
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| | ↓
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| | ↓
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| | ↓
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| |-
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| | Respiratory Rate (per min)
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| | ↔
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| | ↔
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| | ↔/↑
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| | ↑
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| |-
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| | Urine Output (mL/hr)
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| | ↔
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| | ↔
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| | ↓
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| | ↓↓
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| |-
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| | Glasgow coma scale score
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| | ↔
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| | ↔
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| | ↓
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| | ↓
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| |-
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| | Base deficit^
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| | 0 to -2 mEq/L
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| | -2 to -6 mEq/L
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| | -6 to -10 mEq/L
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| | -10 or less mEq/L
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| |-
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| | Need for blood products
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| | Monitor
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| | Possible
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| | Yes
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| | Massive transfusion protocol
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| |}
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| ^Base excess is the quantity of base (HCO3-, in mEq/L) that is above or below the normal range in the body. A negative number is called a base deficit and indicates metabolic acidosis.
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