Lead is not dead in your workplace environment
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Transcript of Lead is not dead in your workplace environment
So in your HEALTH AND SAFETY PROGRAM and TRAINING
• Under the regulations do you cover worker lead threats and risks
• Especially to certain occupations
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In what products was lead commonly used?
• Gasoline (phase-out began 1980)
• Smelting • Lead batteries (25-
78% of all lead used in U.S.)
• Paints and coatings• Solder• Auto manufacturing• Printing
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Ways in which lead enters the body
• Inhalation - Breathing lead fumes or dust. This is the most common route of entry in the workplace.
• Ingestion - Swallowing lead dust via food, cigarettes etc.
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Health Effects
• Lead which is inhaled or ingested gets into the bloodstream.
• Can be circulated throughout your body.
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Health Effects
• Some is excreted while some remains in organs and body tissues.
• If exposure continues, the amount stored in your body will increase if you are absorbing more lead than your body is excreting.
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Chronic Health Effects
During prolonged chronic exposure, many body systems can be affected by lead, including:
• Brain• Kidneys • Muscles• Bones • Blood forming organs• Reproductive systems
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Chronic Health Effects(Resulting from High Lead Exposure and Absorption
Into Body)
• Severe damage to blood forming, nervous, urinary and reproductive systems
• Loss of appetite, metallic taste in the mouth, anxiety, constipation, nausea, pallor, excessive tiredness, weakness, insomnia, headache, nervous irritability, muscle and joint pain or soreness, fine tremors, numbness, dizziness, hyperactivity and colic (with severe abdominal pain, lead line
• Person is easily irritated and may become aggressive
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Chronic Health Effects
• Reproductive systems of both men and women may be affected– Decreased sex drive, impotence and sterility in
men– Miscarriage and stillbirth in women whose
husbands were exposed to lead or where they were exposed
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Chronic Health Effects
• Children born of parents who were exposed to excessive lead are more likely to have birth defects, mental retardation, behavioral disorders or die during the first year of childhood
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Other Chronic Health Effects
Hypertension • Lead exposure has been consistently
associated with increases in blood pressure in studies conducted in both workers and the general population.
• Blood lead levels of less than 20 μg/dL sometimes are associated with increases in blood pressure.
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Other Chronic Health Effects
Decreased kidney function • Low to moderate levels of lead exposure also
have been associated with adverse changes in kidney function.
• This association may be even worse in people who have other risk factors for kidney disease, such as hypertension or diabetes.
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Acute Health Effects
• Acute health effects only appear when worker is exposed to extremely high amounts of lead
• Acute encephalopathy (disorder or disease of the brain) may develop quickly followed by seizures, coma and death from cardio-respiratory arrest
• Again, highly unusual, but not impossible
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Housekeeping/Work Practices
• Use exhaust ventilation to capture dust/fumes whenever possible;
• HEPA vacuum dust-covered work surfaces; dry sweeping or compressed air is prohibited; wet methods may be used;
• Do not eat, drink, smoke or apply cosmetics in areas where lead/lead dust is present;
• Wash hands and face after lead work; • Wear protective clothing to avoid getting dust on
your clothes and then bringing it home to spouse and children.
When working with products that contain lead, such as lead-based paints and lead blocks:
What Jobs Involve Lead? What Jobs Involve Lead?
• Lead smeltingor mining
• Construction/ remodeling• Automobile repair• Plumbing• Police officers/military• Many others
What Hobbies Involve Lead?What Hobbies Involve Lead?
• Car repair• Artistic painting• Stained glass• Pottery glazing• Soldering• Target shooting• Making bullets, slugs
or fishing sinkers
• Lead can enter water by leaching from– Lead-containing pipes– Brass faucets– Solder
• Boiling does not get rid of lead• Running cold water before
use may reduce exposure
Lead in Drinking WaterLead in Drinking Water
Lead in Commercial ProductsLead in Commercial Products
• Lead is still used in products such as:– Bridge paint– Computers– Solder– Pewter– Ceramic glazes– Jewelry– Automotive batteries
• Imported or older pre-regulation products
Clinical EvaluationClinical Evaluation
• Preventive screening• Exposure History• Physical evaluation• Signs and symptoms
Signs and Symptoms: Low ToxicitySigns and Symptoms: Low Toxicity
• Myalgia or paresthesia • Mild fatigue • Irritability • Lethargy • Occasional abdominal discomfort
Signs and Symptoms: Moderate ToxicitySigns and Symptoms: Moderate Toxicity
• Arthralgia • General fatigue • Difficulty concentrating/Muscular exhaustibility • Tremor • Headache • Diffuse abdominal pain • Vomiting • Weight loss • Constipation
Signs and Symptoms: Severe ToxicitySigns and Symptoms: Severe Toxicity
• Paresis or paralysis • Encephalopathy—may abruptly lead to
seizures, changes in consciousness, coma, and death
• Lead line (blue-black) on gingival tissue • Colic (intermittent, severe abdominal cramps)
Complete Blood CountComplete Blood Count
• May show basophilic stippling* in patients with extended significant exposure
* Also seen in arsenic poisoning
Lead poisoning Normal red blood cells
basophilicstippling
Longbone radiographsLongbone radiographs
Lead Lines
Lead Lines
“Lead Lines” in five year old male with radiological growth retardation and blood lead level of 37.7µg/dl
(Photo courtesy of Dr. Celsa López Campos, Clinical Epidemiologic Research Unit, IMSS, Torreón, México)