Burn Injuries
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Transcript of Burn Injuries
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Burn Injuries Dr. Eranda Epaarachchi
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The layers of the skin
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Anatomy of the skin
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Classification of burns – By depth
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What is shown here?
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What is the diagnosis?
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First degree burns
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Characteristics
Epidermis is involved Appearance : Redness (Erythema) Dry & painful Heals within 1 week Complications : Risk of developing skin cancer in
later life
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What are these lesions?
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Superficial – partial thickness burn (20)
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Second degree – Partial thickness
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Characteristics
Extends into superficial dermis Red with clear blister & Blanches with pressure Moist & painful Heals within 2-3 weeks Complications : Local infection, Cellulitis
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What are these lesions?
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What are these lesions?
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Deep partial thickness burn
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Characteristics
Extends into deep dermis Red-and-white with bloody blisters & Less blanching Moist & painful May heal in weeks or progress into a third degree burn Complications : Scarring, contractures (May need skin grafts)
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What are these lesions?
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Third degree burns (Full thickness)
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Characteristics
Extends through entire dermis Stiff and white/brown Dry, leathery to touch Painless Requires excision Complications : Scarring, contractures, amputation
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What are these lesions?
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It’s a fourth degree burn
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Characteristics
Extends through skin, subcutaneous tissue and into underlying muscle and bone
Black (charred) Dry Painless Requires excision Complications : Amputation, significant functional impairment, possible
gangrene, and in some cases death
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Classification of burns by causes
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Chemical
Most chemicals that cause burns are strong acids & bases Acids : H2SO4, HNO3, HCl Bases : NaOH Acid burns : Most of the injury occurs at the point of impact Alkali burns : Capable of deep penetration and can cause severe
pain
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NaOH burn after 44 hours from exposure
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Electrical burns – Causes
1. Workplace injuries2. Taser wounds3. Being defibrillated
without a conductive gel
4. Lightning
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Electrical burns
Human body is very vulnerable to application of supra-physiologic electric fields
Some electrocutions produce no external burns at all, as very little current is required to cause fibrillation of the heart muscle
The internal injuries sustained may be disproportionate to the size of the burns seen (if any), and the extent of the damage is not always obvious
Such injuries may lead to Cardiac arrhythmias Cardiac arrest Unexpected falls with resultant fractures or dislocations
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Electrical burns – Low voltage injuries Low-voltage (<500 AC volts) injuries usually doesn’t
have skin burns This is sufficient to cause cardiac arrest and
ventricular fibrillation
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VF (Can lead to aystole in minutes) – Defibrillation to save the life
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Electrical burns – High voltage (> 1000V) injuries Common cause of third and fourth degree burns Explosions caused by electrical faults produce high
intensity Ultraviolet radiation which can also cause radiation burns
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Radiation burn – causes
Radiation burns are caused by prolonged exposure to UV light (Sun exposure – the commonest) : Severity UVB > UVA Tanning booths Radiation therapy Radioactive fallout X-rays
More severe cases of sun burn result in what is known as "heatstroke“
Microwave burns are caused by the thermal effects of microwave radiation
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Heatstroke
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Microwave burn
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Scalding
Caused by hot liquids (water or oil) or gases (steam) Immersion scald is created when an extremity is held under the surface
of hot water (Common form of burn seen in child abuse) Scald burns are more common in children Generally scald burns are first or second degree burns, but third degree
burns can result, especially with prolonged contact (Diabetic neuropathy)
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Scald
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Immersion scald
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Child abuse?
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SSSS
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Inhalation injury
Steam, smoke and high temperatures can cause inhalational injury to the airway and lungs
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Inhalation injury
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Pathophysiology of burns injuries
Burn injury results in a local or systemic inflammatory response (Depends on the size of the burn)
The lungs may be doubly compromised by smoke inhalation Following a major burn injury, heart rate and peripheral vascular
resistance increase This is due to the release of catecholamines from injured tissues and the
relative hypovolemia that occurs from fluid volume shifts
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Pathophysiology of burns injuries
Initially cardiac output decreases
At approximately 24 hours after burn injuries, cardiac output returns to normal if adequate fluid resuscitation has been given
Following this, cardiac output increases to meet the hyper-metabolic needs of the body
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Pathophysiology of burns injuries
The effects of high temperature on tissue include speeding chemical reactions & denaturing proteins
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Pathophysiology of burns injuries
Due to the inflammatory response, permeability of blood vessels is increased in the burn area This causes exudation of proteins and fluid into the adjacent
interstitial tissue Red cells are not extravasated
This results in increase in the oncotic pressure in the interstitium
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Pathophysiology of burns injuries
The volume of fluid loss is directly proportional to the burn area If burn area is 10% to 15% of the total body surface area (TBSA),
then the consequent fluid loss may cause circulatory shock If it is more than 25% of TBSA, then inflammation occurs even in
the blood vessels remote to the burn, causing greater fluid loss
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Diagnosis – By severity
By American Burn Association
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Major burns – Treat in specialized burn units 1. Age 10-50yrs : Partial thickness burns >25% of total body surface area2. Age <10 or >50 : Partial thickness burns >20% of total body surface area3. Full thickness burns >10%4. Burns involving the hands, face, feet or perineum5. Burns that cross major joints6. Circumferential burns to any extremity7. Any burn associated with inhalational injury8. Electrical burns9. Burns associated with fractures or other trauma10.Burns in infants and the elderly11.Burns in persons at high-risk of developing complications
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Moderate burns – Treat in hospitals
1. Age 10-50yrs : Partial thickness burns involving 15-25% of total body surface area
2. Age <10 or >50 : Partial thickness burns involving 10-20% of total body surface area
3. Full thickness burns involving 2-10% of total body surface area
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Minor burns – Doesn’t require hospitalization 1. Age 10-50yrs : Partial thickness burns <15% of total body
surface area2. Age <10 or >50 : Partial thickness burns involving <10% of
total body surface area3. Full thickness burns <2% of total body surface area, without
associated injuries
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Estimating surface area burnt – Rule of 9
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Lund & Browder charts (More accurate) The size of a person's hand print (palm and fingers) is approximately
0.8% of their TBSA, but for quick estimates, medical personnel round this to 1%, slightly overestimating the size of the affected area
Burns of >/= 10% in children or >/=15% in adults are potentially life threatening injuries (because of the risk of hypovolemic shock) and should have formal fluid resuscitation and monitoring in a burns unit
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Lund & Browder charts
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Lund & Browder charts
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Management
Once the injured person is stabilized, attention is turned to the care of the burn wound itself
Until then, it is advisable to cover the burn wound with a clean and dry sheet or dressing
Early cooling reduces burn depth and pain, but care must be taken as uncontrolled cooling can result in hypothermia
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IV fluids
Children with >10% TBSA burns, and adults with >15% TBSA burns need formal fluid resuscitation and monitoring (blood pressure, pulse rate, temperature and urine output)
Once the burning process has been stopped, the injured person should be volume resuscitated according to the Parkland formula
This formula calculates the amount of Ringer's lactate required to be administered over the first 24 hours post-burn.
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Parkaland formula
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Composition of Ringer’s lactate Hartman’s solution (Very similar, but ionic concentrations are different)
Na+ = 131K+ = 5Ca2+ = 4Cl– = 111Lactate = 29
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IV fluids
Parkland formula = 4ml x (percentage of total body-surface-area sustaining non-superficial burns) x (person's weight in kg)
Half of this total volume should be administered over the first 8 hours, with the remainder given over the following 16 hours
This time frame is calculated from the time at which the burn is sustained, and not the time at which fluid resuscitation is begun
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IV fluids
Children also require the addition of maintenance fluid volume
The formula is a guide only and infusions must be tailored to the urine output and central venous pressure
Inadequate fluid resuscitation may cause renal failure and death, but over-resuscitation also causes morbidity
Crystalloid fluids appear just as good as colloid fluids and as colloids are more expensive they are not recommended
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Other aspects of the management
Wound care : Biosynthetic dressings may speed healing Antibiotics Analgesics Surgery : Skin grafts (As early as possible for better
results) Alternative therapy : Bee honey
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Biosynthetic dressing
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Complications – Infections Risk factors for infections 1. Burn > 30% TBSA2. Full-thickness burn3. Extremes in age (very young, very old)4. Preexisting disease e.g. diabetes5. Virulence and antibiotic resistance of colonizing organism6. Failed skin graft7. Improper initial burn wound care8. Prolonged open burn wound
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Complications
Burn wounds are prone to tetanus (A tetanus booster shot is required if individual has not been immunized within the last 5 years)
Circumferential burns of extremities may compromise circulation. Elevation of limb may help to prevent dependent edema
Acute Tubular Necrosis of the kidneys can be caused by myoglobin and hemoglobin released from damaged muscles and red blood cells
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Prognosis
The modified Baux score determines the futility point for major burn injury The Baux score is determined by adding the size of the burn (% TBSA) to
the age of the patient In most burn units a score of 140 or greater is a non-survivable injury, and
comfort care should be offered In children all burn injuries less than 100% TBSA should be considered a
survivable injury. A major concern of a survivor of any traumatic injury is post-traumatic
stress disorder (PTSD) Another significant concern for children is coping with a disturbance in
body image
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Thank you!