| Extreme
cold is not required for hypothermia to develop, and most cases occur
when the air temperature is between 30 and 50 degrees. Wind carries
heat away from the body rapidly. Evaporation from any wet surface also
draws heat from that surface.
When the wind blows
across a wet object, the object is cooled at a highly accelerated
rate. As a result, a wet person exposed to a breeze can become
hypothermic in a short time, even on a mild day. Once hypothermia sets
in, death can occur unless immediate action is taken. The best way to
combat hypothermia is to dress properly and avoid getting wet. A
non-absorbent, wicking layer of underwear of polypropylene or similar
synthetic, covered by layers of wool, and a waterproof shell would be
good in most wet-weather situations. The waterproof rain gear can be
carried in a small day pack, but should be donned before the other
clothes become wet.
Once a person gets
wet, he or she risks hypothermia, whether from a fall into the water
while fishing, from splash and spray while casting, from excessive
perspiration on a cold day, from leaky waders while standing around in
rain or snow. Coast Guard approved float coats offer good protection
when boating in cold weather.
Wet clothing should be
exchanged for dry clothing as soon as possible, especially if a breeze
is blowing. Getting out of the wind and rain promptly can mean the
difference between a safe outing and a life-threatening ordeal.
One of the most
important defenses against hypothermia is recognition and treatment of
the early symptoms. Uncontrolled shivering is the first signal that
excessive exposure is occurring and that hypothermia is impending. It
is also one of the few symptoms the victim may recognize himself.
As hypothermia sets
in, slurred speech, frequent stumbling, loss of manual dexterity,
memory lapses, exhaustion and drowsiness occur. Often a victim will
not notice these signs, so partners should watch each other when wind,
water or cold create the potential for hypothermia.
It is wise to get out
of the wind and cold, remove wet clothing, and warm the body before
hypothermia sets in. Once the tell-tale symptoms are recognised in any
member of the party, these steps are absolutely critical: Stop, take
shelter, remove wet clothes and warm the body.
If only mild
impairment is evident, warm drinks and dry clothes will probably solve
the problem. High-energy foods can help provide fuel for metabolic
heat production. Powdered sweetened gelatin mixed with warm water
makes a high-energy emergency drink. A warming fire can help speed the
recovery.
In advanced cases of
hypothermia, drowsiness may lead to unconsciousness. Attempt to keep
the patient awake, and give warm drinks. The victim should be placed
in a sleeping bag with a heat source. Skin to skin contact (especially
chest-to-chest) from another person is the best treatment. Warmed
rocks may also be wrapped and placed in the sleeping bag. A fire can
help warm the camp and supply desperately needed heat. The early
warning signs of hypothermia result as the body shuts down circulation
to the limbs and nonessential organs in an attempt to maintain the
core temperature. As more energy is drained, survival becomes
dependent upon stopping the outflow of heat and supplying warmth from
external sources.
Awareness of the signs
followed by prompt attention to the problem can save lives.
Keep hypothermia in
mind whenever you are outdoors and the weather turns wet or
cold."
|