snake poisoning management...330 species in india 50 venomous classification 5 families...
TRANSCRIPT
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SNAKE POISONING&
MANAGEMENT
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Disclaimer
“This presentation is solely intended for educational purpose only and not for any
commercial activity.The ownership and copyright to the materials
remain with the actual owner of the content. No claim for the originality of the content is made”
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✓3500 species all over the world
✓<350 venomous
✓330 species in INDIA
✓50 venomous
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CLASSIFICATION
5 families
1) Colubridae 78% of all species
2) Boidae
3) Atractaspididae moles & asps
4) Elapidae cobras,
kraits,
coral snakes,
mambas
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4) Viperidae:
@ viperinae/true vipers-vipers, adders
@ crotalinae/pit vipers-
rattle snakes
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IDENTIFICATION
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Features of venomous snakes
✓Compressed tail
✓Broad belly scales extending across entire width
✓Small scales on head
✓Hood with or without markings
✓Fangs
✓Rattle
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➢COMMON COBRA
➢COMMON KRAIT
➢RUSELL’S VIPER
➢ SAW SCALED VIPER
THE BIG FOUR
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COMMON COBRA
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3rd supralabial touches eye and nasal shield
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A small wedge shaped scale (cuneate) is +nt b/w 4th and 5th infralabials
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✓3 small scales just behind each eye.
✓Venom- Neurotoxic
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COMMON KRAIT
•Whitish half rings throughout its back
•Creamy white belly
•Hexagonal large scales throughout mid dorsal aspect
•Sub caudals are undivided
•4th infralabial is the largest of infralabials
•Venom- Neurotoxic
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Common Krait :Bungarus caeruleusIndian Krait
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RUSELL’S VIPER•Triangular head with ‘V’ shaped mark
•3 rows of diamond shaped dark spots along the back
•Entire broad plates on belly
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Rusell’s Viper : Daboia ruselli
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SAW SCALED VIPER
•Waxy white lines along the entire length with diamond shaped areas b/w lines
•Head triangular with small scales characteristic white arrow/crow’s foot mark +nt on head
•Broad belly plates and entire shields beneath the plates
•Scales are serrated
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Saw scaled Viper : Echis carinate
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OTHER COMMON
VENOMOUS SNAKES
King Cobra
Banded Krait
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King Cobra;
Ophiophagus hannah
Banded Krait
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SNAKE VENOM
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Toxic saliva by modified parotid.
Concentration shows diurnal and seasonal variation
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CONSTITUENTS
Protein✓Enzymes
✓Non enzymatic toxins
✓Non toxic proteins
Non protein✓ Carbohydrates
✓ Metals
✓ Lipids
✓ Free AA
✓ Nucleotides
✓ Biogenic amines
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SNAKE BITE
1) NON VENOMOUS
2) VENOMOUS
• with envenomation
• without envenomation (20-50%)
• Dry bite
• Protective gear
• Leakage of venom
• Superficial bite
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When venom has been injected
•Fang marks
•Local pain
•Local bleeding
•Lymphangitis
•Lymph node enlargement
•Inflammation
•Blistering
L
O
C
A
L
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When venom has been injected
•Nausea
•Vomiting
•Malaise
•Abdominal pain
•Weakness
•Drowsiness
S
Y
S
T
E
M
I
C
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ELAPID BITE
•Minimum local manifestations
- swelling & local pain
- local necrosis & blistering
- serosanguinous discharge
- Venom ophthalmia
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•Systemic: Neurotoxicity
•Drowsiness
•Paresthesias
•Abnormalities of taste & smell
•Heavy eyelids, Ptosis, Diplopia, Ophthalmoplegia
• Paralysis of facial muscles, Nasal voice, Aphonia
• Difficulty in swallowing
• Generalized flaccid paralysis
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•Convulsions
•Coma
•Respiratory arrest
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VIPERID BITE
Marked local manifestations
➢Swelling around bite site-> whole limb-> adjacent trunk
➢Pain, tenderness, lymphadenopathy
➢Persistent bleeding from the bite site
L
O
C
A
L
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•Spontaneous systemic bleeding –epistaxis, hemoptysis, hematemesis, melaena, hematuria, vaginal bleeding
•Cardiovascular – dizziness, collapse, shock, hypotension, cardiac arrhythmias
almost synonymous with incoagulable blood
S
Y
S
T
E
M
I
C
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MANAGEMENT OF SNAKE BITE✓First aid
✓Hospital measures
✓Additional measures
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FIRST AID
✓Verbal reassurance
✓Immobilization
✓Transfer the patient to hospital
✓Drugs: Analgesics
Antiemetic
Antibiotics
Tetanus toxoid
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HOW NOT TO TREAT A SNAKE BITE
•Tight tourniquet which occludes arterial supply
•Cauterization
•Multiple deep incisions through bite site
•Suction by mouth, vaccum pump or syringe
•Application of subs like pot.permangante, phenol etc.
•Application of electric shock
•Application of ice
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HOSPITAL MEASURES
➢Emergency care
•Airway, Breathing, Circulation, Consciousness
➢History
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Examination
▪Local signs
▪General Signs
-Draining lymph nodes for tenderness or swelling
-Pulse, BP
▪Specific Signs
-Evidence of paralysis
-Evidence of coagulopathy
-Evidence of myolysis
-Evidence of renal impairment
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Investigations
•20 Whole Blood Clotting Test (WBCT)
•Forced expiratory peak flow rate
•Prothrombin time(PT); Activated PartialThromboplastin time(aPTT); Plateletcount
•Complete and Differential blood count
•Se Electrolytes; BUN; Creatinine; Urineexamination
•Creatine phosphokinase (CPK)
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AntiSnakeVenom
Indications for anti venom therapy
Systemic envenoming
• Hemostatic abnormalities
• Evidence of Neurotoxicity
• Cardiovascular abnormalities
• Acute renal injury
Severe Local Envenoming
Pregnant women & Children
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Name Manufacturer; Antivenom Approx Average initial
Dose
Common Krait Indian manufacturers polyvalent 100 ml
Western Rusell’sViper Indian manufacturers polyvalent 100 ml
Indian Saw Scaled Viper Indian manufacturers polyvalent 50 ml
Indian Cobras Indian manufacturers polyvalent 100 ml
Dose
Timing
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METHOD OF ADMINISTRATION
1. I.V. Push injection
Given by slow IV injection (not morethan 2ml/min)
2. Intravenous infusion
Anti venom diluted in 5-10 ml/kg bodyweight of isotonic fluid and infused atconstant rate over one hour
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Repeating Anti venom…
▪Blood in coagulable after 6h or bleeding after1-2 hr
▪Deteriorating neurotoxic or cardiovascularsigns after 1-2 h
▪Initial dose should be repeated and patientshould be revaluated for need of supportivetreatment
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REACTION/ADVERSE EFFECTS
❖ Early (anaphylactic) reaction
• within 10 to 180 mins of 1st dose
• Urticaria, dry cough, fever, nausea, colic, diarrhea, tachycardia
❖ Pyrogenic rections
• within 1-2 hr
• Chills, fever, fall in BP
❖ Late (se.sickness) reaction
• 7 days after t/t
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Postmortem findings
•Fang marks
•Puncture wound 1.5-2.5 cm deep
•Discoloration,swelling & cellulitis around the bite site
•Hemorrhages in bowel & lung
•Kidney inflamed
•Purpuric spots on pericardium
•Internal organs congested
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Thank you