Causes and Risk Factors of Hyperthermia

Hypertermiais the general name given to a variety of heat-related illnesses.

Description of Hyperthermia

Warm weather and outdoor activity go hand in hand. However, it is important for older people to take action to avoid the severe health problems often caused by hot weather.

Health Factors That Increase Risk

The temperature does not have to hit 100 degrees for a person to be at risk. Both one's general health and/or lifestyle may increase a person's chance of suffering a heat-related illness.

Health factors which may increase risk include:

• poor circulation
• inefficient sweat glands, and changes in the skin caused by the normal aging process
• heart, lung and kidney disease as well as any illness that causes general weakness or fever high blood pressure or other conditions that require changes in diet

For example, people on salt-restricted diets may increase their risk of being unable to perspire, caused by medications including diuretics, sedatives and tranquilizers, and certain heart and blood pressure drugs.

Other factors include being substantially overweight or underweight, and drinking alcoholic beverages.

Lifestyle factors that can increase risk are:

• unbearably hot living quarters
• lack of transportation - which prevents people from seeking respite from the heat in shopping malls, movie houses, and libraries
• overdressing - because they may not feel the heat, older people may not dress appropriately in hot weather
• visiting overcrowded places - trips should be scheduled during non-rush hour times
• not understanding weather conditions - older persons at risk should stay indoors on especially hot days.

Symptoms of Hyperthermia

The two most common forms of hyperthermia are heat exhaustion and heat stroke. Of the two, heat stroke is especially dangerous and requires immediate medical attention.

Heat stress occurs when a strain is placed on the body as a result of hot weather.

Heat fatigue is a feeling of weakness brought on by high outdoor temperature. Symptoms include cool, moist skin and a weakened pulse. The person many feel faint.

Heat syncope is a sudden dizziness experienced after exercising in the heat. The skin appears pale and sweaty but is generally moist and cool. The pulse is weakened and the heart rate is usually rapid. Body temperature is normal.

Heat cramps are painful muscle spasms in the abdomen, arms or legs following strenuous activity. Heat cramps are caused by a lack of salt in the body.

Heat exhaustion is a warning that the body is getting too hot. The person may be thirsty, giddy, weak, uncoordinated, nauseated and sweating profusely. The body temperature is normal and the pulse is normal or raised. The skin is cold and clammy.

Heat stroke can be life-threatening and victims can die. A person with heat stroke usually has a body temperature above 104 degrees Fahrenheit. Other symptoms include confusion, combativeness, bizarre behavior, faintness, staggering, strong and rapid pulse, and possible delirium or coma. High body temperature is capable of producing irreversible brain damage.

Diagnosis of Hyperthermia

Diagnosis is based on the medical history (including symptoms) and physical exam.