👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Physiological Adaptation🔖 Free to read, print, and share
Also known as: low body temperature · cold exposure · frozen · exposure
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Use this quick-reference guide to spot, treat, and prevent Hypothermia on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
🩺 Signs
Shivering, then stops if severe
↓HR, ↓BP, ↓RR, confusion
Osborn J-wave on ECG
✅ Do
Remove wet clothes, warm blankets
Warmed IV fluids, O2
Rewarm core gradually
📌 Avoid
Rapid rewarm → afterdrop, arrhythmia
Rubbing extremities
🩺 Watch
VF risk with handling
'Not dead till warm + dead'
📚 Hypothermia — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Hypothermia is a core body temperature below 95 degrees F (35 degrees C) that slows metabolism, depresses the cardiovascular and central nervous systems, and can cause lethal arrhythmias. Rewarming must be gradual and the heart handled gently because cold myocardium is highly irritable. Remember: a hypothermic patient is not dead until warm and dead.
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Key points
Understand these first
Severity ranges from mild (shivering, confusion) to severe (loss of shivering, rigidity, bradycardia, coma).
Cold myocardium is irritable and prone to ventricular fibrillation, so rough handling is avoided.
Active core rewarming includes warmed IV fluids, warm humidified oxygen, and warmed lavage for severe cases.
Passive external rewarming with blankets and a warm environment is used for mild hypothermia.
Resuscitation continues during rewarming because the cold brain can tolerate prolonged arrest.
Afterdrop can occur when cold peripheral blood returns to the core during rewarming.
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Nursing priorities
What to do, in order
Assess airway, breathing, and circulation and check core temperature with a low-reading thermometer.
Remove wet clothing and begin rewarming, prioritizing the core for severe hypothermia.
Handle the patient gently and minimize movement to prevent arrhythmias.
Apply continuous cardiac monitoring and warm IV fluids.
Continue resuscitation efforts until the core temperature is restored before declaring death.
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Red flags — report now
Escalate immediately
Rough movement or jostling can trigger ventricular fibrillation in a severely hypothermic heart.
Do not stop CPR until the patient is rewarmed - not warm, not dead.
Report loss of shivering with worsening confusion as progression to severe hypothermia.
Avoid rapid external-only rewarming, which can cause afterdrop and cardiovascular collapse.
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Labs & values
Numbers to know
Core temperature below 95 degrees F (35 degrees C) is diagnostic
Glucose (monitor for hypoglycemia, normal 70-110 mg/dL)
ABG and potassium for severe cases
ECG may show Osborn (J) waves
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Patient teaching
What patients must know
Dress in layers, stay dry, and cover the head and extremities in cold weather.
Limit alcohol in the cold, as it increases heat loss.
Recognize early signs like intense shivering and confusion and seek warmth promptly.
❓ Hypothermia: NCLEX FAQs
What are the priority nursing interventions for Hypothermia?
Assess airway, breathing, and circulation and check core temperature with a low-reading thermometer. Remove wet clothing and begin rewarming, prioritizing the core for severe hypothermia. Handle the patient gently and minimize movement to prevent arrhythmias. Apply continuous cardiac monitoring and warm IV fluids.
What are the warning signs of Hypothermia a nurse must report?
Rough movement or jostling can trigger ventricular fibrillation in a severely hypothermic heart. Do not stop CPR until the patient is rewarmed - not warm, not dead. Report loss of shivering with worsening confusion as progression to severe hypothermia. Avoid rapid external-only rewarming, which can cause afterdrop and cardiovascular collapse.
What do I need to know about Hypothermia for the NCLEX?
Severity ranges from mild (shivering, confusion) to severe (loss of shivering, rigidity, bradycardia, coma). Cold myocardium is irritable and prone to ventricular fibrillation, so rough handling is avoided. Active core rewarming includes warmed IV fluids, warm humidified oxygen, and warmed lavage for severe cases. Passive external rewarming with blankets and a warm environment is used for mild hypothermia.
What patient teaching is important for Hypothermia?
Dress in layers, stay dry, and cover the head and extremities in cold weather. Limit alcohol in the cold, as it increases heat loss. Recognize early signs like intense shivering and confusion and seek warmth promptly.
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Quick Tip
Severity ranges from mild (shivering, confusion) to severe (loss of shivering, rigidity, bradycardia, coma).