Guide — Emergency Nursing
Hypothermia & Frostbite Nursing Care
Cold slows everything — the heart, the brain, the metabolism — which is exactly why a profoundly hypothermic patient can look dead and still be saved. The rules are counterintuitive: handle gently, rewarm carefully, and don’t call it until they’re warm.
9 min read · Emergency Nursing
Educational use only. Rewarming method selection, resuscitation decisions, and frostbite management are individualized — follow provider orders and your facility’s protocols. Severe hypothermia requires careful, monitored rewarming. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
Overview
Hypothermia is a core temperature below 35°C (95°F), graded mild (32–35), moderate (28–32), and severe (< 28°C). As the body cools, it first compensates (shivering, vasoconstriction, tachycardia), then decompensates — shivering stops, mentation declines, and the heart slows and becomes irritable, prone to lethal arrhythmias. Risk rises with cold/wet exposure, immersion, the very young and old, intoxication, trauma, and illness.
Frostbite is localized freezing of tissue (fingers, toes, nose, ears), graded like burns by depth — from superficial (numb, white, refreezes/thaws) to deep (hard, insensate, with hemorrhagic blisters and risk of necrosis).
Key Concepts
“Not dead until warm and dead”
Cold is protective for the brain, so a severely hypothermic patient with no detectable pulse may still be viable. Resuscitation continues during rewarming, and death is generally not declared until the patient is rewarmed (commonly to ~32–35°C) and still unresponsive. Prolonged CPR can be appropriate.
Handle gently — the irritable cold heart
A cold myocardium is exquisitely prone to ventricular fibrillation. Rough handling, sudden movement, or jostling can trigger arrest — move the patient minimally and gently, and anticipate that defibrillation and many drugs are less effective until the patient is warmer.
Rewarming by severity — and afterdrop
Passive external (remove wet clothes, blankets, warm room) for mild; active external (warming blankets, heat to trunk) and active internal/core (warmed IV fluids and humidified O₂, warm lavage, ECMO/bypass for severe) as it deepens. Watch for afterdrop — cold peripheral blood returning to the core can briefly lower the core temperature and drop BP; rewarming the trunk/core before the extremities helps prevent it.
The ECG clue
Hypothermia classically produces the J wave (Osborn wave) — a positive deflection at the QRS-ST junction — along with bradycardia and a prolonged QT. Expect arrhythmias as the heart cools and rewarms.
Assessment Findings
Use a low-reading core thermometer (standard ones don’t read low enough). Mild: shivering, tachycardia, vasoconstriction, clumsiness, slurred speech. Moderate: shivering ceases, bradycardia, hypotension, declining LOC, dilated pupils. Severe: coma, areflexia, profound bradycardia/hypotension, arrhythmia risk, apparent death. Assess pulses for a full prolonged period (rates are slow), monitor the ECG for the J wave and dysrhythmias, and check glucose and electrolytes. For frostbite, assess color, sensation, blisters, and demarcation — but the depth often can’t be judged until after rewarming and time.
Nursing Priorities
Stop the heat loss, rewarm by stage
Remove wet clothing, insulate, and warm the environment. Apply the rewarming method matched to severity and monitor core temperature continuously. Give warmed IV fluids and warmed humidified oxygen. Rewarm the core before the periphery.
Protect the heart
Minimal, gentle handling; continuous cardiac monitoring; be ready for arrhythmias. Continue resuscitation through rewarming and don’t declare death until warm.
Frostbite — rapid, controlled rewarming
Rewarm in circulating warm water (~37–39°C) only when there’s no risk of refreezing — refreezing thawed tissue is devastating. Do NOT rub or massage the part (causes more injury), don’t use dry/direct heat, expect severe pain on rewarming (analgesia), leave blisters intact per protocol, elevate, and apply loose sterile dressings with separation between digits. Delay decisions about amputation — tissue demarcation takes weeks.
Watch the labs and complications
Monitor glucose, potassium and other electrolytes, acid-base, and coagulation; treat associated trauma, intoxication, and any underlying cause of exposure.
Therapeutic Communication Considerations
Cold-exposure patients often arrive with intertwined social problems — homelessness, intoxication, mental illness — and deserve care without judgment. Reassure families that the slow, careful rewarming and prolonged resuscitation are deliberate, not delay, and that “looks dead” is not the same as dead in hypothermia. As patients warm and reorient, expect confusion and provide calm reorientation. Connect to social work and follow-up to address the exposure’s root cause and prevent recurrence.
Patient & Family Education
Prevention: dress in layers, stay dry, cover extremities and head, limit alcohol in the cold (it causes heat-losing vasodilation and impairs judgment), and recognize early signs (shivering, numbness, clumsiness, confusion) as cues to get warm. Teach frostbite first aid: get out of the cold, don’t rub the area, don’t rewarm if it might refreeze, and seek care for anything beyond superficial. For high-risk patients (older adults, those with circulatory disease, outdoor workers, people experiencing homelessness), problem-solve heating, clothing, and warming-shelter resources, and review medications and conditions that impair cold sensing.
NCLEX Pearls
- ✦“Not dead until warm and dead” — continue resuscitation through rewarming; don’t declare death while cold.
- ✦Handle GENTLY — the cold heart fibrillates easily; rough movement can cause arrest.
- ✦Rewarm the CORE before the periphery to limit afterdrop; J (Osborn) wave is the classic ECG sign.
- ✦Loss of shivering signals worsening (moderate-to-severe) hypothermia, not improvement.
- ✦Frostbite: rapid warm-water rewarming only if no refreezing risk; never rub; expect severe pain; delay amputation decisions.
Related Resources
Standards & sources
Fact-checked Jun 20, 2026This page is written to align with Emergency Nurses Association (ENA) · AHA ACLS / PALS Guidelines · Advanced Trauma Life Support (ATLS). It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →