Heat emergencies...
Posted: Fri May 28, 2010 11:33 pm
Its that time of year again... We should be aware of heat related emergencies and how to deal with them for several reasons. When camping, scouting, hiking, fishing, hunting, etc.. You may start experiencing signs of heat related issues, or see them in your comrades, or other people around you. Its in everybody's best interest for you to recognize and be capable of dealing with the different types of heat related emergency...
Heat emergencies
Shock Heat emergencies fall into three categories of increasing severity: heat cramps, heat exhaustion, and heatstroke.
Considerations
Heat illnesses are easily preventable by taking precautions in hot weather.
Children, elderly, and obese people have a higher risk of developing heat illness. People taking certain medications or drinking alcohol also have a higher risk. However, even a top athlete in superb condition can succumb to heat illness if he or she ignores the warning signs.
If the problem isn't addressed, heat cramps (caused by loss of salt from heavy sweating) can lead to heat exhaustion (caused by dehydration), which can progress to heatstroke. Heatstroke, the most serious of the three, can cause shock, brain damage, organ failure, and even death.
Causes
Heat emergencies are caused by prolonged exposure to extreme heat. The following are common causes of heat emergencies:
Alcohol use
Dehydration
Heart disease
High temperatures or humidity
Medications such as diuretics, neuroleptics, phenothiazines, and anticholinergics
Prolonged or excessive exercise
Sweat gland problems
Too much clothing
Symptoms
The early symptoms of heat illness include:
Profuse sweating
Fatigue
Thirst
Muscle cramps
Later symptoms of heat exhaustion include:
Headache
Dizziness and lightheadedness
Weakness
Nausea and vomiting
Cool, moist skin
Dark urine
The symptoms of heatstroke include:
Fever (temperature above 104 °F)
Irrational behavior
Extreme confusion
Dry, hot, and red skin
Rapid, shallow breathing
Rapid, weak pulse
Seizures
Unconsciousness
First Aid
Have the person lie down in a cool place. Raise the person's feet about 12 inches.
Apply cool, wet cloths (or cool water directly) to the person's skin and use a fan to lower body temperature. Place cold compresses on the person's neck, groin, and armpits.
If alert, give the person beverages to sip (such as Gatorade), or make a salted drink by adding a teaspoon of salt per quart of water. Give a half cup every 15 minutes. Cool water will do if salt beverages are not available.
For muscle cramps, give beverages as above and massage affected muscles gently, but firmly, until they relax.
If the person shows signs of shock (bluish lips and fingernails and decreased alertness), starts having seizures, or loses consciousness, call 911 and give first aid as needed.
DO NOT
Do NOT underestimate the seriousness of heat illness, especially if the person is a child, elderly, or injured.
Do NOT give the person medications that are used to treat fever (such as aspirin or acetaminophen). They will not help, and they may be harmful.
Do NOT give the person salt tablets.
Do NOT give the person liquids that contain alcohol or caffeine. They will interfere with the body's ability to control its internal temperature.
Do NOT use alcohol rubs on the person's skin.
Do NOT give the person anything by mouth (not even salted drinks) if the person is vomiting or unconscious.
When to Contact a Medical Professional
Call 911 if:
The person loses consciousness at any time.
There is any other change in the person's alertness (for example, confusion or seizures).
The person has a fever over 102 °F.
Other symptoms of heatstroke are present (like rapid pulse or rapid breathing).
The person's condition does not improve, or worsens despite treatment.
Prevention
Wear loose-fitting, lightweight clothing in hot weather.
Rest frequently and seek shade when possible.
Avoid exercise or strenuous physical activity outside during hot or humid weather.
Drink plenty of fluids every day. Drink more fluids before, during, and after physical activity.
Be especially careful to avoid overheating if you are taking drugs that impair heat regulation, or if you are overweight or elderly.
Be careful of hot cars in the summer. Allow the car to cool off before getting in.
Alternative Names
Heatstroke
References
Jardine DS. Heat illness and heat stroke. Pediatr Rev. 2007;28(7):249-258.
Dinarello CA, Porat R. Fever and hyperthermia. In: Fauci AS, Harrison TR, eds. Harrison's Principles of Internal Medicine. 17th ed. New York, NY: McGraw Hill; 2008:chap 17.
Heat emergencies
Shock Heat emergencies fall into three categories of increasing severity: heat cramps, heat exhaustion, and heatstroke.
Considerations
Heat illnesses are easily preventable by taking precautions in hot weather.
Children, elderly, and obese people have a higher risk of developing heat illness. People taking certain medications or drinking alcohol also have a higher risk. However, even a top athlete in superb condition can succumb to heat illness if he or she ignores the warning signs.
If the problem isn't addressed, heat cramps (caused by loss of salt from heavy sweating) can lead to heat exhaustion (caused by dehydration), which can progress to heatstroke. Heatstroke, the most serious of the three, can cause shock, brain damage, organ failure, and even death.
Causes
Heat emergencies are caused by prolonged exposure to extreme heat. The following are common causes of heat emergencies:
Alcohol use
Dehydration
Heart disease
High temperatures or humidity
Medications such as diuretics, neuroleptics, phenothiazines, and anticholinergics
Prolonged or excessive exercise
Sweat gland problems
Too much clothing
Symptoms
The early symptoms of heat illness include:
Profuse sweating
Fatigue
Thirst
Muscle cramps
Later symptoms of heat exhaustion include:
Headache
Dizziness and lightheadedness
Weakness
Nausea and vomiting
Cool, moist skin
Dark urine
The symptoms of heatstroke include:
Fever (temperature above 104 °F)
Irrational behavior
Extreme confusion
Dry, hot, and red skin
Rapid, shallow breathing
Rapid, weak pulse
Seizures
Unconsciousness
First Aid
Have the person lie down in a cool place. Raise the person's feet about 12 inches.
Apply cool, wet cloths (or cool water directly) to the person's skin and use a fan to lower body temperature. Place cold compresses on the person's neck, groin, and armpits.
If alert, give the person beverages to sip (such as Gatorade), or make a salted drink by adding a teaspoon of salt per quart of water. Give a half cup every 15 minutes. Cool water will do if salt beverages are not available.
For muscle cramps, give beverages as above and massage affected muscles gently, but firmly, until they relax.
If the person shows signs of shock (bluish lips and fingernails and decreased alertness), starts having seizures, or loses consciousness, call 911 and give first aid as needed.
DO NOT
Do NOT underestimate the seriousness of heat illness, especially if the person is a child, elderly, or injured.
Do NOT give the person medications that are used to treat fever (such as aspirin or acetaminophen). They will not help, and they may be harmful.
Do NOT give the person salt tablets.
Do NOT give the person liquids that contain alcohol or caffeine. They will interfere with the body's ability to control its internal temperature.
Do NOT use alcohol rubs on the person's skin.
Do NOT give the person anything by mouth (not even salted drinks) if the person is vomiting or unconscious.
When to Contact a Medical Professional
Call 911 if:
The person loses consciousness at any time.
There is any other change in the person's alertness (for example, confusion or seizures).
The person has a fever over 102 °F.
Other symptoms of heatstroke are present (like rapid pulse or rapid breathing).
The person's condition does not improve, or worsens despite treatment.
Prevention
Wear loose-fitting, lightweight clothing in hot weather.
Rest frequently and seek shade when possible.
Avoid exercise or strenuous physical activity outside during hot or humid weather.
Drink plenty of fluids every day. Drink more fluids before, during, and after physical activity.
Be especially careful to avoid overheating if you are taking drugs that impair heat regulation, or if you are overweight or elderly.
Be careful of hot cars in the summer. Allow the car to cool off before getting in.
Alternative Names
Heatstroke
References
Jardine DS. Heat illness and heat stroke. Pediatr Rev. 2007;28(7):249-258.
Dinarello CA, Porat R. Fever and hyperthermia. In: Fauci AS, Harrison TR, eds. Harrison's Principles of Internal Medicine. 17th ed. New York, NY: McGraw Hill; 2008:chap 17.