Lead poisoning in PediatricsPresentation Transcript
Dr. Abdul Ghaffar Latiffi
Pediatric medicine 1st
“ Lead makes the mind give way.”
Greek Physician, 2000 B.C
o Heavy, soft, flexible, bluish, tasteless, odorless metal.
o wont break down over time, doesn't vaporize.
o Φ conduct electricity - resistant to corrosion.
o Abundant in the earth's crust (13g/ton or 0.0013% of the earth's crust)
o Throughout human history, over 350 million tons of lead
have been mined, used and ultimately discarded in the
Lead Poisoning (Plumbism)
"lead poisoning contributed to
The decline of the Roman empire “
Lead poisoning is a medical condition
caused by increased levels of lead in the
APP currently defines lead poisoning as
a venous BLL ≥ 5μg/dL.
first time lead poisoning in Childhood was
reported in Ceylon In 1967 .
Lead paint prohibited in 1922.
UNEP banned global use of leaded gasoline(1995)
Still allowed in 6 nations. Afghanistan, Algeria,
Iraq, North Korea, Myanmar and Yemen
Approx half million children in the USA have toxic BLL
A public health disaster and challenge
Children 6 yrs are more susceptible to leads toxic effects
Increased prevalence in inner city children
Children and pregnant women are at double jeopardy
due to increased absorption and heavy distribution.
Nutritional deficiencies (Iron ,calcium, zinc, copper, and
protein ) result in greater lead absorption
August 14, 2007
Uses and Sources of Lead
Pigments and paints (pre1978)
Toys and Jewelry
Petrol (antiknock agent ).
Herbal remedies ,Opium
Storage batteries, Weights
Bullets and Ammunition.
Half life of lead in the body compartments
• Blood- 25 days
•Soft tissues - 40 days
•Mineralized tissues- >25 years
• Diets high in fat, low in calcium, magnesium, iron, zinc, and copper, increase
the absorption of lead.
Lead absorbed via the GI , respiratory tract ,skin and transplacentally by
the fetus then distribute to the blood, soft tissues and mineralized tissues
Lead is not metabolized in the body; it is absorbed,
distributed, and excreted
► Lead exerts its toxic effect by two mechanisms
a) Pb binds to enzymes in the heme synthesis pathway
Inhibits ferrochelatase increase level of
protoporphyrin in the erythrocyte cause Microcytic
b)Lead as a high potency surrogate is disrupting calcium
homeostasis and in interfering with calcium-dependent
Lead interferes with enzymes that help in the
synthesis of vitamin D
Lead alters the permeability of blood vessels
and collagen synthesis
Lead exposure has also been associated with a
decrease in activity of immune cells such as PMN
Interferes with mitochondrial oxidative
enhances oxidation and cell apoptosis.
lead exposure often occurs with vague and non
specific symptoms, it frequently goes unrecognized
Acute lead poisoning while less common, shows up
more quickly and can be fatal.
chronic lead poisoning take time to develop,
however. Children can appear healthy despite having
high levels of lead in their blood.
Impairment of IQ occur at even lower levels of
exposure (1 µg/dL.)
1. loss of appetite
3. weight loss
7. learning disabilities
8. behavior problems.
1. Cranial nerve paralysis
Blood Lead Effects Level
Degree of Lead Poisoning
A. Usually made via screening program
B. In suspected cases , must obtain a detailed history
• Onset of symptoms
• History of Pica
• Assessment of potential sources
• Family history of lead poisoning
C. PhysiCal examination
Pallor and hyperactivity
Burton lines on the gums
wrist drop, and cognitive dysfunction
•signs of elevated iCP
Hypertension ,Respiratory depression
Lab and radiographic findings:
1. Increased blood lead level
• Basophilic stippling on RBC ( aggregation of ribosomal RNA in the cytoplasm of RBC)
3. Increased FEP concentration
• high proteins, Lymphocytic pleocytosis
5.Radiodensity at the distal metaphyseal area of long bones
(Lead lines ) usually in chronic lead poisoning
Long bones radiographs
“Lead Lines” in
five year old
blood lead level
in 3 yrs old
girl with BLL of
Acute and Chronic Anemia (IDA)
Failure to Thrive
Abdominal pain (peptic ulcer ,appendicitis)
Heavy Metal Toxicity
Hydrocarbon Inhalation Injury
Hematologic and CNS neoplasm
Behavior and emotional disorders
Treatment & Management
Treatment of lead toxicity involves
Prevention of further lead exposure
Prevention of further lead exposure
Identification and correction of exposure sources is critical
Frequently hands and pacifiers washing.
Use only cold water from the tap ,Hot water may contain more
Avoid using home remedies (such as azarcon, greta, pay-loo-
ah,zafron) and cosmetics (such as kohl)
Shower and change clothes after working
if your work or hobbies involve working with
Correction of dietary def in iron, calcium,
magnesium, and zinc.
Vitamin C is a weak but natural chelating agent
May be performed in patients with acute lead
ingestion in whom lead paint chips are
identified on plain abdominal radiographs.
Polyethylene glycol solution (GoLytely) can be
used for lead densities in the stomach and/or
Gastric lavage may be performed.
Secure the airway before the initiation of
gastric lavage in an obtunded child with acute
Charcoal binds poorly to lead, and no evidence
Anticonvulsants may be needed.
Mannitol or corticosteroids and volume
restriction are indicated in patients with
A high-calcium, high-phosphorus diet and
large doses of vitamin D may remove lead
from the blood by depositing it in the bones.
The adverse effects of lead are not reversible.
In acute lead poisoning ( seizures and coma),
there is a high risk Of permanent brain damage
The long-term effects of lower levels of lead can
also be permanent and severe.
Asymptomatic patients tend to have a better
prognosis, with good improvement in intellectual
functions following lowering of the BLL.
Sequelae of encephalopathy includes seizure
disorders, impaired mentation, and rarely
1.Nelson - Textbook Of Pediatrics - 19th Edition
6. Park’s textbook of preventive and social medicine