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GENERAL MANAGEMENT OF POISONING - mbbsclub.commbbsclub.com/download/3/Forensic Medicine/GENERAL...
Transcript of GENERAL MANAGEMENT OF POISONING - mbbsclub.commbbsclub.com/download/3/Forensic Medicine/GENERAL...
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GENERAL MANAGEMENT OF POISONING
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• Toxicom (Greek) arrow poison • Toxicum (Latin) poison
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LAW RELATED TO POISON S.337-J PPC WHOEVER ADMINISTER TO, OR CAUSES TO BE TAKEN BY ANY PERSON, ANY POISON OR ANY STUPEFYING , INTOXICATING, OR UNWHOLESOME DRUG OR SUCH OTHER THING WITH INTENT TO CAUSE HURT TO SUCH PERSON, OR WITH INTENT TO COMMIT OR TO FACILITATE THE COMMISSION OF AN OFFENCE, OR KNOWING IT TO BE LIKELY THAT HE WILL THEREBY CAUSE HURT MAY, IN ADDITION TO THE PUNISHMENT OF “ARSH” OR “DAMAN” PROVIDED FOR THE KIND OF HURT CAUSED, BE ALSO PUNISHED.
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Acute poisoning
• should be considered if the patient: has – symptoms that began shortly after
exposure to a known poison – has been exposed to a poison known to
have caused fatalities
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Chronic poisoning
• Determine severity of exposure • Determine magnitude of organ involvement. • Careful history and physical examination
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MEDICOLEGAL DUTIES OF DOCTOR
• PRELIMINARY PARTICULARS • TREATMENT
• PRESERVATION OF EVIDENCE • DYING DECLARATION/DEPOSITION • INFORM AUTHORITIES
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WRITTEN RECORDS
• In any case of poisoning in which there is a
possibility of legal action at a later date
• The physician must keep careful written records of all relevant observations and findings.
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PRESERVATION OF EVIDENCE
• Specimens should be placed directly in clean containers
• The bottles used for storing specimens should be clean and free from contamination by chemicals or metals.
• Gloves and instruments should not contaminated by disinfectants or chemicals which may be transferred to specimens
• Store the specimens in a frozen state without any chemical preservatives.
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• The container should be sealed with a glue-paper label extending over the cover and down onto the jar.
• Avoid using a seal such as adhesive tape, which can be removed and replaced.
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• The physician’s signature should be affixed to the label at the juncture between cap and bottle.
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Evidence to be saved in non-fatal poisoning
• Prescription paper • containers from which the poison was obtained. • Urine (24-h specimen). • Blood (10–50 ml). • Vomitus and first two gastric washings. • Feces. • Body fat (obtained by biopsy). • Hair clippings. • Clippings of fingernails and toenails. • Food.
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Evidence to be saved in fatal poisoning
• The stomach and contents • Liver (at least one-half) • Kidneys (at least one) • Blood (50–100 ml; should completely fill
container) • Bone (100 g) • Lung (at least one) • Brain (at least one half).
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Legal chain of custody
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SPECIAL PROBLEMS
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Attempted suicide Physician’s Main Responsibilities
• Give immediate medical care and to prevent further attempts.
• The patient must be placed in quiet, protected surroundings, preferably away from the family.
• After the patient recovers from the immediate symptoms, a careful evaluation should be made, preferably by a psychiatrist, to minimize the possibility of further suicide attempts.
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Successful suicide
• If a patient commits suicide the physician is legally responsible for reporting
the death to the police.
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Homicidal poisoning
• The patient must be hospitalized until recovery. • The circumstances should be reported to the
police. – Further proof of attempted homicidal poisoning
must be left to the police. • If a patient dies as a result of a suspected
homicidal poisoning, the physician is legally bound to report the death to the police.
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Accidental poisoning
• May require 24 hours of observation. • Food poisoning resulting from eating in a public restaurant or from eating contaminated commercial food must be reported to the local public health officer.
• Fatalities from suspected accidental poisonings must be reported to the police
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Occupational poisoning
• If poisoning has resulted from occupational exposure
• A report must be sent to the proper authorities if the poisoning is reportable.
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Dying declaration and dying deposition
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SUPPORTIVE MEASURES
• Airway • Breathing • Circulation • History • Physical examination • Decontamination
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ALTERED MENTAL STATUS • Check blood glucose level at bed side • Seizures (Diazepam 0.1-0.2mg/kg over 1-2 min ) • Comma cocktail Dextrose (25g -50 ml of 50% solution ) 100mg of thiamine I/M or I/V infusion Naloxone 0.4 -2 mg I/V Flumazenil (in case of benzodiazepine )
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Diagnosis of poisoning
• Toxidromes – Cholinergic – Anti cholinergic – Sympathomimetic – Opioids
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• Odor of breath – Garlic
• Arsenic ,organophosphate compounds – Coal gas
• Carbon monoxide – Bitter almonds
• Cyanide
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• Pupil size • Miosis
– Opium ,organophosphorus compounds • Mydriasis
– Atropine
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Color of skin and mucous membranes
• Cyanosis
– Aniline, nitrobenzene, nitrates • Hyperemia • Cyanide, alcohol • Jaundice • phosphorus, carbon tetrachloride, acetaminophen
• Pallor – Benzene
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Heart rate
• Tachycardia – Vasodilator – tricyclic antidepressant
• Bradycardia – calcium blocker -Clonidine -sedative hypnotic
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• Pulse: Rapid – Theophylline, amphetamines, cocaine,
ephedrine Irregular – Insecticides, tricyclic antidepressants Slow – Morphine
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• Temperature: – Increased
• salicylates, atropine, cocaine – Decreased
• Chloral hydrate, opiates, barbiturates
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DECONTAMINATION
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DECONTAMINATION
Inhaled Poison • Remove from source of poison • Give oxygen • Inhalation of water aerosol (help to dilute
inhaled irritants ) • Check for hoarseness and singed nasal hairs
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CONTAMINATED EYES
• Wash with plain water or normal saline • Do not use neutralizing solution • Slowly dribble 50-100ml of saline
through I/V tubing • Check with pH paper • Careful eye examination
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CONTAMINATED SKIN
• Wash with plenty of water and dilute soap solution
• Discard contaminated clothes in a marked plastic bag
• Remove all particulate prior to irrigation • Immersion of burns in - Ammonium salt soln. - 10% Calcium gluconate. - s/c inj of Calcium deep to burn
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GASTRIC DECONTAMINATION
• Dilution • Emesis • Demulcents • Gastric lavage • Adsorption with activated charcoal • Catharsis • Whole Bowel Irrigation
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DILUTION WITH WATER
• 1-2 cupfuls for child and 2-3 cupfuls for
an adult • Not universally recommended for solid
dosage forms • Chemicals and household products are
best managed by dilution
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EMESIS
• Syrup of Ipecac • Potassium and antimony tartarte ,copper sulphate , zinc sulphate , mustard powder , salt solution are NO LONGER recommended
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GASTRIC LAVAGE
• Laver (to wash)
• “It is the process of washing out the stomach with solutions , including water , saline , sodium bicarbonate, calcium salts , tannic acid and potassium permanganate.”
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COMPLICATIONS
• Epistaxis • Laryngeospasm • Hypoxia • Aspiration pneumonia • Hyponatremia, hypocalcaemia • Water intoxication • Mechanical injury to gut
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ADSORBENTS
• Activated charcoal • Kaolin • Fuller’s earth • Cholestyramine • Pectin • Attapulgite
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ACTIVATED CHARCOAL
• Dose 50-100g in adults 25-50g in children 1g/kg in infants
• ‘Gut Dialysis’(multiple doses orally) Carbamazipine, Dapsone,Theophylline etc
• Less Useful Iron, Lithium, Potassium, Alcohol, Cyanides etc
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CATHARTICS
SALINE CATHARTICS Sodium containing - Na2SO4 10% (250 mg/kg children-15-20 gm in adults ) - Na2 SO4 / (Na)3 PO4 (20ml in children- 40ml in adults ) Magnesium containing MgSO4 10% (250mg /kg body weight -5-10g in adults ) Magnesium citrate (4ml/kg in children-250-300ml in adults )
SORBITOL 1-1.5g/kg
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Contraindication • Obstruction, ileus, or electrolyte imbalance. • Do not use oil based products
– castor oil increases the absorption and toxicity of chlorinated insecticides.
– Never use irritant cathartics • Do not give magnesium-containing or hypertonic
cathartics to patients with – renal disease or those exposed to nephrotoxins, – myoglobinuria or hemoglobinuria
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WHOLE BOWEL IRRIGATION
Commonly used solutions are • Sodium sulfate • Polyethylene glycol electrolyte solution Given by N/G tube 1-2 l/h Never confuse Polyethylene glycol with ethylene glycol
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Indication for whole bowel irrigation
• Iron • Lithium • Sustained release drugs • Enteric coated drugs • Body packers(cocaine)
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Contraindication for whole bowel irrigation
• Patient with hemodynamic compromise • Ileus
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ANTIDOTES
Antidote are substances which counteract the effect of poisons without causing appreciable harm to the body
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ANTIDOTES
Based on mode of action: • Mechanical / Physical Antidotes • Chemical • Physiological • Functional • Dispositional • Universal
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MECHANICAL ANTIDOTES
• These are the substances which impede
the absorption of poison by their presence
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MECHANICAL ANTIDOTES
• Demulcents fat, oil, milk, egg albumin not to be used in fat soluble poisons
• Bulky food • Activated Charcoal
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CHEMICAL ANTIDOTES
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CHEMICAL ANTIDOTES
• Formaldehyde poisoning • NH3 converts it to hexamethylenetetramine
• Oxalic acid poisoning calcium salts reacts with oxalic acid and
produce calcium oxalate • Mercuric ion Sodium formaldehyde converts it to less soluble
metallic mercury
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PHARMACOLOGICAL ANTIDOTES
• These agents produce effects which are opposite to that of the poison
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PHARMACOLOGICAL ANTIDOTES
• Atropine – Pilocarpine • Morphine – Nalaxone • Organophosphates – Atropine & Oximes • Benzodiazepines - Flumazenil • Cyanides – Sodium Nitrite Amyl Nitrite Sodium Thiosulphate
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Dispositional Antidote
Involves alteration of absorption metabolism Distribution excretion
Acetaminophen over dosage
Conversion of toxic intermediate compound to non-toxic form by conjugation with glutathione(sulfhydryl donor)
N-Acetylcysteine
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Functional antagonist
• Acts on one biochemical system to produce effects that are opposite from those produced on another system
– During anaphylactic reaction after administration
of drug intense bronchoconstriction occurs – Epinephrine reverses this effect
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Chelators
Chela =claw antidote against heavy metals • Binds with metal ions to form stable
complexes • Chelate is cyclic complex formed between
metal and a compound that contain two or more binding sites
• Five or six membered ring are more stable
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Chelators
– British antilewisite (BAL)(dimercaprol) • Arsenical gas
– Ethylene diamine tetra –acetic acid (EDTA) • Lead ,iron ,zinc ,copper
– Pencillamine • Lead, mercury
– Deferoxamine • Ferrous and ferric ions
– Succimer • Lead
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Elimination of absorbed poison
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METHODS TO ENHANCE ELIMINATION
• pH alteration – Alkaline diuresis – Acid diuresis
• Multiple dose activated charcoal • Dialysis -Hemodialysis -Peritoneal Dialysis • Heamoperfusion
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METHODS TO ENHANCE ELIMINATION
• Alkaline diuresis – Phenobarbitone – Salicylate
Check plasma potassium level and RFT’s I/V bicarbonate 1-2 mEq/kg over 3-4 hours aiming urine pH -7.5-8.5
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METHODS TO ENHANCE ELIMINATION
• Acid diuresis – Amphetamines – Phencyclidine
ammonium chloride 75mg/kg/24 hours aiming urine pH 5.5-6
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METHODS TO ENHANCE ELIMINATION
• Dialysis - Peritoneal Dialysis Severely intoxicated patients Governed by laws of osmosis Increased recovery of water soluble Chemical by hypertonic fluid
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METHODS TO ENHANCE ELIMINATION
• Dialysis hemodialysis Low molecular weight Small molecular size Low volume of distribution Complication hypotension convulsions infections
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Indication for haemoperfusion
Salicylates Ethylene glycol Lithium Theophylline Charcoal haemoperfusion Carbamazepine theophylline
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Complications
Hypotension Air embolism Sepsis Bleeding Thrombocytopenia
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General treatment
Oxygen for respiratory failure Morphine for pain Diuretics for pulmonary edema Diazepam for convulsion Saline infusion Glucose Potassium /sodium