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Heat Illness


Heat stroke. The most serious stage of. heat illness. Symptoms are: Dizziness and confusion ... Heat Stroke Risks (Continued) Dehydrated, from diarrhea, fever, ... – PowerPoint PPT presentation

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Title: Heat Illness

Heat Illness
You Will Learn
  • What is heat illness?
  • Where and why does it happen?
  • How do you treat it?
  • How do you prevent it?
  • What are the WISHA rules
  • about heat illness?

What is Heat Illness?
  • Heat illness can be
  • Heat rash
  • Fainting
  • Heat cramps
  • Heat exhaustion
  • Heat stroke

Where Does Heat Illness Happen?
  • Heat illness can affect anyone, anytime.
  • It can happen in foundries, laundries,
    construction projects, landscaping, agriculture,

Why Does Heat Illness Happen?
  • When a human body cannot dispose of excess heat,
    it stores it.
  • When the heat is stored, the bodys core
    temperature raises and the heart rate increases.

Why Does Heat Illness Happen?
  • Four environmental factors affect a bodys core
  • Air temperature
  • Humidity level
  • Radiant heat (such as the sun or
    a furnace)
  • Air velocity

Why Does Heat Illness Happen?
  • Five personal characteristics affect a bodys
    core temperature
  • Age
  • Weight
  • Fitness
  • Medical condition
  • Acclimatization to heat

How Does Heat Illness Happen?
  • The body reacts to high external temperature by
    circulating blood to the skin, the skin
    temperature raises, and heat flows out through
    the skin.
  • However, if muscles are being used for labor,
    less blood flow is available to the skin to
    reduce the heat.

How Does Heat Illness Happen?
  • Sweating reduces the
  • internal body temperature.
  • However, sweating only
  • works to reduce body
  • temperature if the humidity
  • level is low enough to permit
  • evaporation and if fluids and
  • salts lost are replaced.

Types of Heat Illnesses
  • There are five main classifications of heat
  • Heat rash
  • Fainting
  • Heat cramps
  • Heat exhaustion
  • Heat stroke

Types and Treatments
  • Heat rash
  • or prickly heat, can occur in hot and humid
    environments where sweat is not removed from the
    skin. Usually disappears when worker returns to
    cool environment.

Types and Treatments
  • Fainting
  • Can be a problem for workers
    un-acclimatized to heat. Moving around, rather
    than standing still, can help. Lying down can

Types and Treatments
  • Heat cramps
  • Happens when workers perform hard physical labor
    in a hot environment. Most common in the arms
    and legs. Cramping can occur after work has
    stopped. Worker needs to take water every 15 to
    20 minutes. Drinking an
  • electrolyte replacement
  • (like Gatorade) may help.

Types and Treatments
  • Heat exhaustion
  • The whole body, especially the circulatory
    system, is extremely stressed. Possible symptoms
  • Pale, flushed face and neck
  • Clammy skin
  • Heavy sweating
  • Fatigue
  • Shortness of breath
  • Headache, dizziness or fainting
  • Nausea and vomiting
  • Rapid heartbeat and breathing

Types and Treatments
  • Heat exhaustion treatment
  • Get medical help.
  • Dont leave the person alone.
  • While waiting
  • Remove worker to cool place to rest
  • Remove as much clothing as possible
  • Give water and electrolytes
  • Dont allow person to get chilled

Types and Treatments
  • Heat stroke
  • The most serious stage of
  • heat illness.
  • Symptoms are
  • Dizziness and confusion
  • Red, hot, dry skin
  • Nausea and vomiting
  • Very little sweating
  • Rapid pulse
  • High body temperature, 105 F or higher
  • Convulsions, fainting

Types and Treatments
  • Heat stroke treatment
  • Victim will die unless treated
  • properly, only 50 survival rate. Call 911
    immediately. While awaiting medical help, get
    victim into cool area, fan vigorously, apply cool
  • water to clothing or skin,
  • apply ice packs under
  • arms and to the groin
  • area.

Heat Stroke Risks
  • You have a higher risk of getting heat stroke if
    you are
  • Not physically fit
  • Overweight
  • Have chronic illness like heart disease or
  • Drink alcohol or take drugs, either illegal or

Heat Stroke Risks (Continued)
  • Dehydrated, from diarrhea, fever, or not drinking
    enough water
  • Wearing heavy or tight clothing
  • Wearing PPE, such as a full body suit or
  • Not used to working in the heat
  • (not acclimatized)

Becoming Acclimatized
  • It usually takes 4 to 7 days of regular exposure,
    but everyone is different.
  • Acclimatization needs to happen for workers
    returning to work after
  • A prolonged absence
  • Recent illness
  • Recently moving from cool to hot climate

Becoming Acclimatized
  • Workers should limit exposure to the heat and
    gradually build up exposure.
  • Workers should be monitored closely for signs and
    symptoms of heat illness.
  • You lose acclimatization in a few weeks if you
    stop working in the heat.

WISHA Rule on Heat Stress
  • Labor and Industries Heat Stress Rule
  • (WAC 296-62-09013)
  • Temperature, radiant heat, or temperature-humidit
    y combinations
  • This rule specifies that any worker subjected to
    temperature extremes, radiant heat, humidity or
    air velocity combinations that are likely to
    produce harmful responses, shall be protected by
    adequate controls, methods, procedures or
    protective clothing.
  • Labor and Industries safety health inspectors
    could apply this rule when investigating
    complaints of excessive heat at a worksite.

OSHA Guidance on Heat Stress
  • The OSHA Technical Manual offers guidance on
    constructing a complete heat stress program.
  • A complete program can include
  • Measuring environmental conditions,
  • Calculating work/load assessments, and
  • Personal protective equipment.

OSHA Guidance (Continued)
  • Additionally, an employer can consider
  • Administrative, work practice and engineering
  • Body cooling devices, such as ice vests, wetted
    clothing, water-cooled garments, and circulating

OSHA Guidance (Continued)
  • The OSHA Technical Manual has three appendices
    that teaches you how to
  • Ask the right questions to review the workplace.
  • Evaluate a heat related illness or accident.
  • Use a wet bulb globe temperature measuring system.

ACGIH Guidance on Heat Stress
  • The American Conference of Governmental
    Industrial Hygienists (ACGIH) has a
  • publication about Threshold Limit Values
  • (TLVs) and has a chapter on Heat Stress, where
    you can learn to measure your work environment,
    compare to TLVs and see guidance on
  • Work/rest regimes,
  • Clothing,
  • Work activities, and
  • Water and salt supplementation.

Measuring Environmental Conditions
  • These are two examples of instruments that can
    measure the environment to most approximate deep
    body temperature and other responses to heat.
    The instruments give you a Wet Bulb Globe
    Temperature Index. (WBGT)

Both the OSHA Manual and the ACGIH TLV
Guidelines call for the use of the WBGT.
For Additional Help
For additional assistance in evaluating your
workplace for heat stress hazards, you can call
one of our industrial hygiene consultants. This
is a confidential, free service not connected to
regulatory inspections. Click below for local
LI office locations www.LNI.wa.gov/wisha/consu
Click here to get a two-page summary on heat
  • Thank you for taking the time to learn about
    safety and health and how to prevent future
    injuries and illnesses.
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