sharon brown, rn. heat related emergencies heat related physiology information about body...
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Environmental Emergencies
Sharon Brown, RN
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Heat Related EmergenciesHeat related physiology
Information about body temperature is collected by thermoreceptors and sent to hypothalamus
Sweating is primary response to heat ~ loss of NA, K, fluids can lead to dehydration
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Heat EdemaOccurs during long periods of standing or
sitting“Theme Park Rash”Tx is rest, elevation
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Heat CrampsLeg, shoulder, thigh, and abdominal crampsForm of hyponatremia r/t loss of sodium and
excess water intakeTX includes rest, cooling measures.D/C teaching includes encourage adding
electrolye drinks while outdoors
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Heat ExhaustionProlonged heat exposure without adequate
fluid replacementTemp can be greater than 104S/S ~ pale, ashen, profuse sweating,
weakness, hypotensive, tachycardic, severe thirst
Tx – cooling measures, IVF replacement
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Heat StrokeEmergent and life threatening. Mortality rate
is 50%S/S – skin is hot and dry. Temp is greater than
106, ALOCCooling measures – wet cloths, fans, ice packs
at arm pits, neck and groin. Prevent shivering with Demerol or ativan
Monitor for Rhabdomyolysis (dark urine, muscle cramps)
Aggressive cooling is continued until around 102 degrees
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Cold Related EmergenciesBody attempts to conserve heat by
vasoconstriction and produce heat by shivering
DM patients cannot feel extreme changes and may not be aware of potential harm
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ChilblainsChilblains is caused by intermittent, prolonged
exposureto damp, nonfreezing environments that are
abovefreezing resulting in painful inflamed lesions
over theexposed sites (usually hands, ears, lower legs
and feet),with no permanent impairment.
Frostnip is a very mild form of frostbite
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FrostbiteTrue tissue freezing with
formation of ice crystals in tissue
Most common areas include fingers, toes, ears, nose
Most severe injury results from tissues that freeze, thaw, and then refreeze again
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Frostbite degrees of severity1st degree
Pale skin, may be cyanotic, edema, decreased sensation
Superficial 2nd degreeCyanotic, edema, blisters, decreased sensation
Deep 2nd degreePale & cyanotic, edema, anesthesia at site, non-
pliable skin3rd degree
Pale, cyanotic, necrotic, gangrene
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FrostbiteTX includes
Rapidly re-warm affected area in 100-108 temp water for 15-30 minutes
Endpoint of rewarming is softening of skin and return of sensation
Elevate affected part
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HypothermiaPhysiologic changes with hypothermia
79 degrees – obtunded, no DTR’s, no pain response
77 degrees – apnea, pulmonary edema68 degrees – asystole
Treatment for ALL patientsRemove all wet garmentsProvide warm blanketsLimit movement
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Mild Hypothermia93.2-96.8Slurred speech, shivering, pale skin
(vasoconstriction)Passive rewarming (0.5-2F/hour)
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Moderate Hypothermia86-93.2ALOC, decreased RR, shivering stops at 89Need to re-warm core as well as extremities
because of re-warming shock! (cold blood from periphery reaches core and causes hypotension and dysrythmias)
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Severe HypothermiaLess than 86 degreesPupils are fixed and dilatedBradycardia, comaIf VF occurs, attempt defib x 1. If no
response, need to focus on rewarming patient first.
Requires passive external, active external, and active internal rewarming
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Submersion Incidents4,000 deaths/year40% are less than 4 years oldDie from hypoxia…not from too much fluid in
lungsCold water has better prognosis than warm
water, but cold water has higher risk for dysrhythmias
TX – ABC’s, must consider secondary trauma, monitor for pulmonary complications
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Submersion Death generally occurs from hypoxia
followed by respiratory failure and ischemic neurologic injury
• Most drowning are considered wet drowning in which the alveoli develop impaired gas exchange after the lungs are flooded; aspiration of as little as 5 cc/kg can result in wet drowning
• About 10-20% of victims suffer dry drowning, in which glottic closure and laryngospasm occur before aspiration of liquid, followed by asphyxia
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SnakebitesOnly 10-15 deaths/year, but several thousand
bitesMost are pit vipers
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Snake bites, cont.S/S ~ metallic taste, muscle quivering,
tingling around mouth, burning at wound site, diaphoresis, seizures
Need to know time, location and description of snake
Pit viper ~ puncture from fangs, semi circle teeth marks
Coral snake ~ scratch marks, teeth marksTreatment
Decrease movement, immobilze extremity, don’t elevate
Need anti venin. (administer within 4 hours of bite) May need to transfer out.
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Dog BitesMost common animal bite seen in EDCopious wound irrigationMost wounds are left open to heal from inside
out d/t high risk of infectionPatient is usually prescribed antibiotics
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Spider bitesBlack Widow
Lives in dark areasFound in all states except AlaskaOnly female is poisonous with red hourglass on
bellyInitial bite is felt as pinprick
20 minutes~dull ache, abd. pain, cramping, parasthesias
1 hour ~ severe pain, increases within 12-48 hours Can progress with hypotension, shock, and resp.
failureTX – ice to bite site, Ca gluconate, antivenin
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Black Widow
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Spider BitesBrown Recluse
Small brown or tan spider with a band (violin shaped)
Bite is initially painless or mild, localized 2-4 hours – pain, redness and blistering 2-4 days – painful purpura 7-14 days – necrotizing, ulcerated wound
s/s – fever, chills, N/V, joint painTX- cool compress, debridement, HBO, Dapsone
(used for leprosy)
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Brown Recluse
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Lyme DiseaseBulls’ Eye lesion following Tick Bite (can be
delay of 3-30 days)Tick must be attached for 24 hours to
transmit diseaseNon-specific flu s/s and can develop into
systemic illness with neuro changes (memory loss, meningitis, poor motor coordination)
Tx – amoxicillin, doxycycline
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Lyme Disease