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Hypothermia
Simon Harvey
Casualty Care Course 2012
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Factors
O Very important
O Normal body temperature 37◦C
O Heat production less than heat loss
O Cold, windy, wet, unfit, injured
O Heat produced in muscles during exercise
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Problem
O Shivering produces heat
O Below 33◦C shivering stops so body
temperature falls much faster
O Mild hypothermia 33-37◦C
O Severe hypothermia below 33◦C
O Usual scenario exposure (? due to injury)
– collapse with hypothermia
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Symptoms
O Mild
O 37 - 35◦C
O “chilly”
O Stiff fingers
O Numb
O Muscles uncoordinated
O Shivering starts
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Symptoms
O Moderate
O 35 - 33◦C
O Stumbling
O Confused
O Weakness
O Speech slow
O Shivering stops!
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Symptoms
O Severe
O 32 - 30◦C
O Unable to walk or stand
O Slow pulse
O Irritable
O Reduced respiratory rate
O Severe muscular incoordination
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Symptoms
O Even lower!
O 30 - 28◦C
O Muscles rigid
O Semi-conscious
O Pupils dilated
O Pulse & breathing may be difficult to
detect
O Below 28◦C Unconscious/ cardiac arrest
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Treatment
O Follow algorithm
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Hypothermia Algorithm for Fell Use (MRC England & Wales)
Initial Casualty Assessment
Personal & casualty security
ABC & conscious level
Head to toe examination
Look for signs of life Assess skin temperature
If possible check pulse, BP, temp, GCS
Is casualty shivering?
Hypothermic???
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Hypothermia Algorithm for Fell Use continued
Patient Is Shivering
Shelter from wind
Change wet clothing for dry
clothing
Hot packs/ hot air
Food & warm drinks
Insulate
Evacuate (carry off)
Mild Hypothermia
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Hypothermia Algorithm for Fell Use continued
Patient Not Shivering
Signs of Life (YES)
Insulate
No external heat
Do not remove clothing
Evacuate Smoothly
Helicopter if possible
Severe Hypothermia
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Hypothermia Algorithm for Fell Use
Patient not shivering
Severe Hypothermia
No signs of life
NO
Do not perform CPR
Insulate
No external heat
Do not remove clothing
Evacuate smoothly
Helicopter if possible
YES
Diagnose death
Injuries compatible with death?
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Hypothermia Algorithm for Fell Use (MRC England & Wales)
O LDSAMRA Medical Sub Committee –
Hypothermia Working Party
O November 1995
O If in doubt ask for help!
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Frostbite
O Thankfully rare
O Freezing of tissues
O Toes, fingers and nose
O White, stiff, hard & frozen extremities
O Insulate
O Do not rub affected part
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Questions
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Hypothermia The End
Simon Harvey
Casualty Care Course 2012