occupational hematology -...
TRANSCRIPT
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Occupational Hematology Dr. Alireza Safaeian
Occupational Medicine Specialist
Assistant Professor of School of Medicine
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Occupational Exposure
• Blood Cell Survival (Denaturated Hb & Hemolysis)
• Metabolism (Porphyria)
• Blood cell Formation (Aplasia)
• Hematopoietic Neopelasms (Preleukemia & leukemia)
• Coagulation (Thrombocytopenia)
• Decreased Oxygen Saturation (CO)
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Disorders Associated With Shortened
Red Blood Cell Survival
• Methemoglobinemia and Hemolysis Produced
By Oxidant Chemical
• Hemolysis Associated With Exposure To
Heavy Metals
• The Porphyrias
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Methemoglobinemia and Hemolysis
Produced By Oxidant Chemical
• Methemoglobin is formed by oxidation of ferrous Hb (Fe2+) to ferric Hb (Fe 3+)
• Ferric Hg : incapable of delivering oxygen to the tissues
• An NADH-dependent enzyme, methaemoglobin reductase, reduces ferric iron back to
ferrous Hb
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Heinz body anemia
• Oxidation of Hb was toxic to RBC and could be followed by and acute hemolysis known as Heinz body anemia
• Heinz body are RBC inclusions that represent precipitated Hb are classically seen in individuals with a deficiency G6PD after exposure to an oxidant stress
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Pathophysiology of Oxidant Hemolysis
• Oxidation Hb Denaturation Hb
Precipitated Hb within RBC Alter the
surface membrane of RBC and increased
rigidity and leakage Extravascular
hemolysis Bite cell or blister cell
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Chemicals associated with methemoglobinemia or
oxidative hemolysis
Chemical Use
Aniline Rubber , dye stuffs , production of MBI (Methylen Bisphenol Isocyanat)
Nitroaniline Dyes
Toluidine Dyes,organic chemicals
P-Chloraniline Dyes,pharmaceuticals,pesticides
O-Toluidine Laboratory analytic reagent, production of trypan blue stain, chlorine test kits
,test tapes
Naphthalene Fumigants used in clothing industry
Paradichlorobenzene Fumigants used in clothing industry
Nitrates Soil fertilizers
Trinitrotoluene Explosives
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Clinical presentation
Met-Hb % Symptoms
10-30 Cyanosis, Mild fatigue,
Tachycardia
30-50 Weakness, Breathlessness
Headache, Execise intolerance
50-70 Altered consciousness
>70-80 Coma, Death
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Clinical presentation
• Patient appear deeply cyanotic (Blue worker)
• Normoxia or mild hypoxia at pulse oximetry
• Normal oxygen tension in ABG
• CO-oximetry
• Reticulocytosis in PBS
• Bite or blistered red cell in PBS
• Polycythemia in chronic methemoglobinemia
• Heinz body anemia +/- methemoglobin formation
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Prevention
• Minimize atmospheric and cutaneous exposure to oxidizing
chemicals such as coal tar
• Biologic monitoring in the workplace by measuring
methemoglobin levels and reticulocyte counts
• Screening for G6PD deficiency before a hemolytic episode or
1-2 month after the hemolysis
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Treatment
• Removal of the offending agents
• Decontamination
• Mild intoxication(<%20) observation
• Moderate to severe (>%30) oxygen%100, methylene blue
solution %1 at a dose of 1-2 mg/kg over 10 minutes
• Exchange transfusion
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Aniline
• Use in: synthesis of aniline dyes, accelerator and antioxidant in rubber industry, production of pesticides, plastics, paints and varnishes
• Fat-soluble and readily penetrate the skin, even the through clothing
• Vapor form may entry to the body through the lung
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Hemolysis Associated With Exposure To
Heavy Metals
• Arsine
• Lead
• Mercury
• Copper
• Antimony
• Mechanism of hemolysis is unknown, but it is thought to be
related to the affinity of this directly cytolytic metals to thiol groups such as are found on the surfaces of RBC
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Arsine
• Volatile, colorless, non-irritating gas, Garlicky odor
• Produced by the action of acid on a metal contaminated with
arsenic
6 H2 + As2O3 2 AsH3 + 3 H2O
• Most occupational exposure :
1) Preparation of crystals and conducting devices in the
semicoductor industry
2) Smelting & refinery +/_ stibine
3) chemical industries .
• Respiratory tract is the most important portal of entry
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Clinical Presentation
• Acute arsine poisoning : acute and massive IV hemolysis +/_delayed 2-24 h after exposure
• Nausea, vomiting, abdominal cramping , headache, malaise and dyspnea
• Tea-colored urine
• P/E: Peculiar garlicky odor of arsine, fever, tachycardia, tachypnea and hypotension
• Jaundice, generalized nonspecific abdominal tenderness
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Lab. Findings
• Hemoglobinuria
• Decreased plasma haptoglobin & increased free HB levels
• The plasma may be brownish-red from the presence of methemalbumine
• Poikilocytosis, basophilic stippling and polychromasia at PBS
• Decreased HCT, increased indirect bilirubin and DIC (low fibrinogen level & prolonged PT)
• Altered renal function increased serum Cr
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Treatment
• Vigorous hydration
• Exchange transfusion if plasma Hb levels>400-
500mg/dl
• Hemodialysis if ARF developed
• All survivors of acute arsine poisoning must be
evaluated for at least 1 years for RF
• Reduction of exposure or removal from exposure
in chronic arsine poisoning
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Lead
• Suppression erythropoiesis and heme synthesis
• Hemolytic anemia
• Pathogenesis of lead induced hemolysis is related
to inhibition of pyrimidin 5-nucleotidase
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The Porphyrias
• Genetic disorder OR Acquired
• Abnormalities in heme biosynthetic pathway
• Accumulation of heme precursors (δ Aminolevulinic
acid)
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Clinical Syndroms
• Neurotoxicity : abdominal colic, constipation, autonomic dysfunction, sensorimotor neuropathy and psychiatric problem (direct toxic effect of the urine-soluble heme
precursor)
• Cutaneous photosensitivity : repetitive vesiculation, scaring and deformity with hypertrichosis of sun-exposed areas of the skin (result of urine insoluble heme precursor )
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Toxic substances associated with
acquired porphyria in human
Toxin Use
Hexachlorobenzene Fungicide
2,4 Dichlorophenol Herbicide
2,4,5 Trichlorophenol Herbicide
2,3,7,8Tetrachlorodibenzo-p-dioxin Herbicide contaminant
O-Benzyl-p-chlorophenol Cleanser and disinfectant
2-Benzyl-p-dichlorophenol Commercial disinfectant
Vinyl chloride Plastics
Lead Paint compounds
Aluminum Phosphorus binder
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Disorders Affecting Blood Cell
Formation & Morphology
• Aplastic anemia
• Myelodysplastic Syndromes
• Multiple Myeloma
• Toxic Thrombocytopenia
Cytogenetic study
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Aplastic Anemia
• Idiopathic (50%)
• Secondary :
1) Drugs: chloramphenicol, acetazolamide, phenylbutazone, phenytoin, sulfonamide, cytotoxic drugs such as antimetabolites and alkylating agents
2) Chemicals: Benzene
3) Ionizing Radiation
4) Infection
5) Immunologic
6) Hereditary disease
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Benzene
• Occupational exposure: Rubber manufacturing,
shoemaking, petroleum and chemical production, printing , steel working
• OSHA (PEL) : 1 PPM
• BM: Hypocellularity with fatty replacement
• Prognosis: Up to 40% patient may recover completely after removal of exposure
• Treatment:
1) Supportive: transfusion, GFE, GCSF, GMCSF, Androgens
2) Allogenic BM trasplantation
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Chemical causes AA in an occupational setting
Chemical Use
Benzene Intermediate in the synthesis of
fabrics,pesticides,rubber,solvet for
glues,varnishs,paints,octane booster for
gasoline
Trinitrotoluene Production of explosive
Hexachlorocyclohexane
Pentachlorophenol,DDT
Pesticides
Arsenic Manufacture of glass,paintenamels,weed
killers,tanning agent,pesticide
Ethylene glycol monomethyl or
monobutyl ether
Production of
paints,lacquers,dyes,inks,cleaning agents
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Mylodysplastic syndroms
• Exposure: Benzene & Ionizing radiation
• Several case reposts : exposure to pesticides, solvents, farming, textile work, health professions.
• Lab data : cytopnea and MCV.
• Dx : bone marrow transplantation.
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Multiple Myeloma
• There is no definitive link between occupational exposure &
risk of M.M
• Exposure: petroleum products , organic solvents , heavy
metals , pesticides & asbestosis . ( all are hypothetical)
• Worker at risk: agricultural workers , chemical workers ,
miners , smelters , stokers , furniture workers
• High dose radiation has confirmed relation
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Toxic thrombocytopenia
Toxic agent Use Mechanism
Toluene diisocyanate Polymerizing agent immune
2,2-dichlorovinyl -
dimethylphosphate
Dieldrin
Pyrethrin
Hexachlorocyclohexa-ne
(lindane)
Chlorophenothane
(DDT)
insecticide
Megakaryocyte
hypoplasia
Turpentine Organic solvent immune
Vinyl chloride plastics Liver insufficiency with
hypersplenism
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Thanks For Your Attention
Any Question?