Shock
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Class I
Class II
Class III
Class IV
Blood loss (ml)
750
750–1500
1500–2000
2000
Blood loss (%)
15
15–30
30–40
40
HR (per min)
<100
>100
>120
140
Blood pressure
Normal
Normal
↓
↓
Pulse pressure
Normal or ↑
↓
↓
↓
RR
14–20
20–30
30–40
<35
30
20–30
5–15
Negligible
Mildly anxious
Anxious and confused
Confused, lethargic
Crystalloid
Crystalloid +
Crystalloid +
Urine ml/hr Mental status
Slightly anxious
Fluid (3:1 rule)‡ Crystalloid
blood
blood
Class II
Class III
Class IV
Blood loss (ml)
750
750–1500
1500–2000
2000
Blood loss (%)
15
15–30
30–40
40
HR (per min)
<100
>100
>120
140
Blood pressure
Normal
Normal
↓
↓
Pulse pressure
Normal or ↑
↓
↓
↓
RR
14–20
20–30
30–40
<35
30
20–30
5–15
Negligible
Mildly anxious
Anxious and confused
Confused, lethargic
Crystalloid
Crystalloid +
Crystalloid +
Urine ml/hr Mental status
Slightly anxious
Fluid (3:1 rule)‡ Crystalloid
blood
blood
