Hyperthermia

Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
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W8MD medical weight loss NYC and sleep center NYC

Hyperthermia
Synonyms	N/A
Pronounce	N/A
Specialty	N/A
Symptoms	Elevated body temperature, confusion, dizziness, nausea, vomiting, headache, muscle cramps
Complications	Heat stroke, organ failure, death
Onset	Rapid
Duration	Variable, depending on treatment
Types	N/A
Causes	Heat exposure, high humidity, physical exertion in hot environments
Risks	Elderly, young children, athletes, outdoor workers, chronic illness
Diagnosis	Based on clinical presentation and body temperature
Differential diagnosis	Fever, infection, thyroid storm, neuroleptic malignant syndrome
Prevention	Hydration, cooling measures, avoiding heat exposure
Treatment	Cooling, hydration, electrolyte replacement
Medication	N/A
Prognosis	Good with prompt treatment, poor if untreated
Frequency	Common in hot climates
Deaths	Varies, can be significant during heat waves

Hyperthermia refers to an elevated body temperature resulting from the body's inability to regulate its internal temperature. It can arise due to various factors including environmental conditions, certain medications, and illicit drugs. Elevated body temperatures beyond 101°F (38.3°C) are generally considered hyperthermic states. Untreated hyperthermia can lead to heat-related injuries that damage body tissues.

Classification and Causes

Hyperthermia manifests in three predominant forms, categorized by increasing severity:

1. Heat cramps: These are painful muscle spasms, usually in the legs or abdomen, often accompanied by excessive sweating. It is considered the mildest form of hyperthermia.
2. Heat exhaustion: A more serious form affecting the entire body rather than specific muscles. It can cause symptoms like fainting, dizziness, lowered blood pressure, and dehydration.
3. Heat stroke: The most severe form of hyperthermia and is a medical emergency. Prolonged heat stroke can result in brain damage or death. The body's cooling mechanisms fail, leading to rapidly rising internal temperatures.

Common causes of hyperthermia include:

• Environmental Factors: Extremely hot, sunny, and humid weather conditions.
• Physical Activity: Intense physical exertion, especially in hot environments.
• Vulnerable Populations: Infants and the elderly may be at risk even in indoor settings if they don't receive adequate cooling, as their bodies may struggle to regulate temperature.
• Illicit Drugs: Drugs such as ecstasy and amphetamines can precipitate rapid and extreme increases in body temperature.
• Other Risk Factors: Dark clothing, wearing heavy gear, obesity, dehydration, fever, and certain medications like beta blockers and antipsychotics.

Symptoms and Treatments

Heat Cramps

• Symptoms:
  • Muscle cramps, especially in legs and abdomen
  • Excessive sweating leading to dehydration and loss of electrolytes
• Treatment:
  • Relocating to a cooler environment
  • Resting the affected muscles
  • Rehydration with water or electrolyte solutions

Heat Exhaustion

• Symptoms:
  • Fainting or dizziness
  • Hypotension (low blood pressure)
  • Severe dehydration
  • Dry mouth and increased thirst
  • Cool, moist skin due to excessive sweating
  • Nausea or vomiting resulting from dehydration
• Treatment:
  • Moving the patient to a cool place
  • Removing excess clothing
  • Applying cold compresses or damp cloths
  • Elevating feet in case of dizziness
  • Drinking rehydrating solutions, if the patient is conscious and not vomiting
  • Positioning a vomiting patient on their side

Heat Stroke

• Symptoms:
  • Early Indicators: Restlessness, confusion, rapid heart rate
  • Advanced Symptoms: Seizures, extremely low blood pressure, slow heart rate, delirium or coma, hot and dry skin (absence of sweating)
• Treatment:
  • Immediate emergency medical attention is required.
  • Rapid cooling methods such as undressing the patient, applying wet cloths, introducing a fan or air conditioning, using ice packs in armpits, neck, and groin.
  • Immersing patient in an ice bath.
  • Administration of cold IV fluids
  • Medications to control seizures or cardiac complications.

Prevention and Awareness

Hyperthermia is preventable with proper awareness and precautions. It's essential to stay hydrated, avoid overexertion in hot conditions, wear light-colored and breathable clothing, and be aware of the risks associated with medications and illicit drugs.

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