Non Thermal injuries, Burn
Reconstruction Principles
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Types of non Thermal Injuries? 1. Electrical injuries
? 2. Chemical injuries
? 3. Cold Injuries
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? 4. Ionizing radiation injuriesElectrical injuries
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Contact BurnsPATHOPHYSIOLOGY
? Joule Effect:
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? Passage of current through a solid conductor results in conversion of electricalenergy to heat
? Ohm's Law:
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? I = V / R? Intensity of the current (amperage) is directly proportional to the potential flow
(voltage) and inversely proportional to the resistance
? Joule's Law:
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? J = 0.24 x I sq x R x T
? J = Heat Production I = Current R = Resistance T = Time
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? Resistance of body tissues? Nerves and Blood Vessels - Good to excellent conduction
? Muscle Bone and Skin - Resistant to passage of electricity Electrical
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Burns
? Extent of injury depends on
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? Type of current (alternating vs direct)? Pathway of flow
? Local tissue resistance
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? Duration of contact Electrical Burns
Mortality of electrical burns
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?? Low-voltage injuries:
? Alter the cardiac cycle
? High-voltage injuries
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? Cause concomitant tissue damage? Survival of contact with voltage greater than 70,000 volts uncommon
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CLASSIFICATION? I Physical
1.Heat
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2.Electrical Burn injuries
3.Lightening injuries
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4.Radiation burns5.Friction burns
? I Chemical
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Acids --1.Sulphuric acid
2. Hydrochloric acid
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3. Nitric acid4.hydrofluoric acid
5.Chromic acid
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Classification--contd.
Alkalies ? 1.Caustic soda
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2.Caustic potash3.Lime
4. ammonia
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Organics ? 1. Phenol
2. Lysol
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3.CresolInorganic -- 1. Phosphorus
2. Sodium
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3. Magnesium
I I Other special burns
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1.Hot coal tar burns2.Jaggery burns
3.Molten metal burns
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4.Hot oil burns
CHEMICAL BURNS
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?Apart from damaging skin chemical toxins may get
absorbed through skin and go into circulation in
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chemical burns.Toxic effects on patients are in1. liver--acute liver atrophy
2. renal--renal failure
3. nervous ?delerium and convulsions
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Carbolic acid (Phenol) , Creselic acid (cresol),Chromic acid and Hydrofluoric acid are known to
cause systemic toxicity
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Management of chemical burns
1.Wounds to be washed with running water minimum for 15 min or till
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litmus test becomes negative.
2.Proper care of eyes in facial burns with ophthalmic reference
3. Early excision and skin grafting.
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Surgical
Surgical Management
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Special Chemical Burns
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?Hydrofluoric acid burns--HF acid is used in glass
industry . Patient presents with severe intense pain
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at the site of burn. Treatment in these burns is CaGluconate irrigation or local injection.
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?Phenol burns--- are known for its systemicmanifestations. Treatment is irrigation with copious
water and removal of phenol.
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Hydrofluoric acid burns
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Tar burns
Car battery acid burns
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Burns of special sites
1.Burns of face ?eye, ear
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2.Burns of handFACIAL BURNS
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? Eye burns ?
? inability to close the lids
? exposure keratitis with damage to cornea.
? managed either with tarsorraphy or early excision and skin grafting
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Ear burns ?
? Ear cartilage is peculiar in nature ?
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1. is a single cartilage2. perichondrium is tightly adherent with skin on both
the sides
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? Burns of ear if not properly treated may lead to
chondritis and crumpled ear deformity.
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? Treatment includes ?1. closed dressing with antibacterial cream
2. pil ows to be avoided to prevent frequent rub and
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subsequent infection
3.excision and temporoparietal fascial cover in full
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thickness burns of ear.--- Content provided by FirstRanker.com ---
Summary of tt. For specific chemical burns
? Irrigation with water-all except sodium , lithium, potassium metals
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and mustard gas? Calcium salt inj. Or irrigation ?hydrofluoric acid
? cover with oil ? Na, K ,LITH. Etc.
? cover with water ?phosphorous metal
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Radiation burns
Management
? Aloe vera cream
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? Corticosteroid creams? Systemic Amifostine
Cold injuries
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Frost bite
? Rewarming of the skin
? Debridement and pain medication
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? Whirl pool therapy? Anticoagulants and antibiotics
? Surgery
? Hyperbaric oxygen
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Trench foot
Below freezing
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Temperature+ moisture
Management
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? Rest, warming
? Picric acid, Boric acid
? Alcohol
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