Heat Stroke Nursing Guide

Heat Stroke vs Heat Exhaustion

Heat Illness Spectrum

Condition	Core Temp	CNS Involvement	Management
Heat cramps	Normal	None	Rest, oral electrolytes
Heat syncope	Normal or mildly elevated	Brief LOC from vasodilation	Lie flat, rehydration
Heat exhaustion	37–40°C	None (alert)	Cooling, IV fluids
Heat stroke	>40°C (104°F)	Present — confusion, coma, seizures	Emergency cooling, ICU

Heat stroke definition: Core temperature >40°C AND central nervous system (CNS) dysfunction (confusion, seizures, coma). CNS involvement distinguishes heat stroke from heat exhaustion — it is a life-threatening emergency.

Classic vs Exertional Heat Stroke

Feature	Classic (non-exertional)	Exertional
Who	Elderly, chronically ill, medications (anticholinergics, diuretics, beta-blockers)	Young, healthy — athletes, outdoor workers, soldiers, Hajj pilgrims
Sweating	Often absent (anhidrosis)	Usually profuse sweating
Temperature rise	Gradual over days	Rapid during exertion
Rhabdomyolysis	Less common	Common — severe muscle breakdown
Lactic acidosis	Less common	Common
Setting	Heat waves, poor ventilation, elderly living alone	Desert races, construction sites, Hajj

Immediate Cooling — Time-Critical

"Cool first, transport second." Every minute above 40°C causes progressive organ damage. Target: reduce core temperature to <39°C within 30 minutes.

Cooling Methods — Effectiveness Ranking

Method	Cooling Rate	Notes
Ice water immersion (IWI)	0.35°C/min (fastest)	Gold standard for exertional heat stroke; place in bath of ice water (2–15°C); not practical for elderly
Ice slurry ingestion	0.2°C/min	Adjunct — swallow cold ice slurry; effective in alert patients
Ice packs to neck, axillae, groin	0.1–0.2°C/min	Good adjunct; always use; wet towels with fanning also effective
Cold water misting + fanning	0.1–0.3°C/min	Evaporative cooling — effective in dry GCC heat; used in Hajj cooling stations
Cold IV fluids (4°C)	Minor contribution	Useful adjunct; not primary cooling method
Cooling blankets	Slow	Less effective than IWI; use if others unavailable

Immediate Nursing Actions

Remove from heat — get patient indoors/shade, remove excess clothing
Call resuscitation team — heat stroke is a medical emergency
Begin cooling immediately — ice packs (axillae, groin, neck), wet towels + fanning, ice water immersion if available
Monitor core temperature — rectal thermometer (most accurate); oesophageal probe in ICU. Stop active cooling at 39°C to prevent overshoot hypothermia
IV access — two large-bore cannulas; cool IV fluids (0.9% NaCl)
Airway — unconscious patient → recovery position → consider intubation if GCS ≤8
Seizure management — benzodiazepine (diazepam/lorazepam) for seizures; avoid phenytoin (worsens heat dissipation)
Investigations — FBC, U&E, creatinine, LFTs, clotting (DIC), CK (rhabdomyolysis), glucose, ABG, ECG, urine myoglobin

Multi-Organ Complications

Organ Dysfunction in Heat Stroke

System	Complication	Nursing Monitoring
CNS	Encephalopathy, cerebral oedema, seizures	Hourly GCS, pupils, seizure precautions
Cardiovascular	Hypotension, arrhythmias, high-output heart failure	Continuous ECG, arterial line, cardiac output monitoring
Renal	Acute kidney injury — myoglobinuria, dehydration	Hourly urine output; urine dip for myoglobin; Cr/eGFR every 4–6 hrs
Liver	Acute hepatic necrosis — peak AST/ALT Day 2–3	Daily LFTs; coagulopathy monitoring
Haematological	DIC — consumption coagulopathy	FBC, coag screen every 4–6 hrs; fibrinogen; platelet trend
Muscle	Rhabdomyolysis — CK often >10,000 U/L in exertional	Serial CK, urine colour (tea-coloured = myoglobinuria)
GI	GI haemorrhage, ileus, gut barrier failure → bacteraemia	Stool/NG output; observe for GI bleed

Rhabdomyolysis Management

Aggressive IV hydration: 0.9% NaCl 1–1.5 L/hr until urine output ≥200–300 mL/hr (myoglobin flushing)
Target urine output: ≥200 mL/hr until urine clears from myoglobin
Monitor: Urine colour, serial CK, potassium (rhabdomyolysis causes hyperkalaemia), creatinine
Urine alkalinisation: Sodium bicarbonate to maintain urine pH >6.5 — prevents myoglobin precipitation in tubules (controversial; use if alkalotic trend in urine)
Avoid NSAIDs and nephrotoxins during acute rhabdomyolysis

GCC Context — Hajj, Summer Labour & Heat

Hajj Heat Emergency

The Hajj pilgrimage brings 2–3 million Muslims to Mecca in Saudi Arabia annually. During summer Hajj (when the Islamic calendar aligns with June–September), temperatures reach 45–48°C. Heat stroke is one of the leading causes of Hajj mortality.

Scale: Saudi MOH deploys 25,000+ healthcare workers for Hajj; dozens of air-conditioned first aid posts along pilgrimage routes; mobile intensive care units
Risk factors for pilgrims: Elderly, chronically ill, prescribed beta-blockers/diuretics/anticholinergics, dehydration, overcrowding, black ihram clothing (absorbs heat)
Saudi cooling stations: Misting fans + chilled water stations deployed at Mina, Arafat, Muzdalifah and Tawaf circuits
Saudi MOH heat stroke protocol: Ice water immersion baths deployed at field hospitals; target core temperature <39°C within 30 min; ice packs + cold IV fluids at first aid posts
GCC nurses at Hajj: Specialist GCC emergency nursing roles at Hajj — particularly Saudi MOH nurses trained in mass casualty heat management

Heat Stroke in GCC Outdoor Workers

Construction workers in UAE, Qatar, KSA — peak risk in June–September (heat index 55°C+)
UAE/Qatar labour laws mandate heat ban (outdoor work prohibited 12:30–3:00 PM during summer)
Nurses in occupational health roles must recognise heat illness presentation and institute immediate cooling
Hydration monitoring — 500 mL water per hour for outdoor workers; electrolyte supplementation
Heat acclimatisation: 10–14 days progressive exposure for new workers from cooler climates

Prevention Strategies

Individual Prevention

Hydration: 500 mL water every hour in extreme heat; urine pale yellow target
Avoid peak heat hours: 11 AM – 4 PM; schedule outdoor activities for early morning/late evening
Light, loose, light-coloured clothing; wide-brim hat
Air-conditioned rest breaks every 45–60 min
Heat acclimatisation: 1–2 hrs/day of heat exposure over 10–14 days before full work in heat
High-risk medications review: diuretics, anticholinergics, beta-blockers, antipsychotics in summer

Exam MCQs — DHA / SCFHS / QCHP

Q1. A 68-year-old man is found collapsed outside during a 45°C afternoon. Rectal temperature is 41.2°C. He is confused, with dry skin and incoherent speech. What is the PRIORITY intervention?

A) Administer antipyretic (paracetamol) to reduce core temperature B) Begin immediate physical cooling: ice packs to neck/axillae/groin, cold water misting with fanning; transfer to emergency facility C) Administer 1 L of oral rehydration solution D) Wait for ambulance before initiating any cooling measures

✅ B — Heat stroke is a medical emergency requiring IMMEDIATE cooling. "Cool first, transport second." Antipyretics (paracetamol, ibuprofen) do NOT work in heat stroke — body temperature is elevated by exogenous heat, not by the prostaglandin-mediated fever pathway. Begin external cooling immediately while arranging transport.

Q2. A young construction worker from Bangladesh is brought to the field clinic by colleagues. He is sweating profusely, confused and has a rectal temperature of 41.8°C. Cooling is initiated. Which monitoring parameter indicates successful cooling and when to STOP active cooling?

A) Stop when patient's skin feels cool to touch B) Stop active cooling when core temperature reaches 39°C — to prevent overshoot hypothermia C) Continue cooling until patient's GCS normalises to 15 D) Stop cooling when axillary temperature reaches 37°C

✅ B — Stop active aggressive cooling when core (rectal) temperature reaches 39°C. Continuing beyond this risks overshoot hypothermia (core temp <36°C) which causes its own complications. Axillary temperature is inaccurate in heat stroke (peripheral vasoconstriction/vasodilation). GCS improvement lags behind temperature correction.

Q3. A heat stroke patient's urine appears dark brown ("tea-coloured"). CK is 42,000 U/L. What condition is present and what is the CORRECT fluid management?

A) Haematuria — restrict fluids and monitor B) Rhabdomyolysis — aggressive IV hydration with 0.9% NaCl, target urine output 200–300 mL/hr C) Normal finding in heat stroke — no action required D) Liver failure — administer N-acetylcysteine

✅ B — Dark brown "tea-coloured" or "cola-coloured" urine + high CK = rhabdomyolysis (myoglobin in urine). Myoglobin is toxic to renal tubules. Treatment: aggressive IV hydration (1–1.5 L/hr) to maintain urine output 200–300 mL/hr to flush myoglobin through kidneys before tubular damage occurs. Monitor potassium (hyperkalaemia from muscle destruction).

Q4. Which of the following is the MOST effective cooling method for exertional heat stroke in a young, healthy person?

A) Cooling blanket placed over the patient B) Antipyretic medications (paracetamol + ibuprofen) C) Ice water immersion (placing patient in bath of ice water 2–15°C) D) Room temperature IV saline infusion

✅ C — Ice water immersion (IWI) is the gold standard and fastest cooling method for exertional heat stroke — achieves cooling rate of ~0.35°C/min. Cooling blankets are much slower. Antipyretics have no effect in heat stroke. IV saline contributes minimally to core cooling. IWI may be impractical in the elderly (cardiac risk, claustrophobia) but is ideal for young exertional heat stroke.

🌡️ Heat Stroke — GCC Emergency