burns lecture for 4th year mbbs
DESCRIPTION
Basics for burn patient management for initial and late sequelae,along with a glimpse of rehabilitative measures.TRANSCRIPT
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BURNDR.NADIR MEHMOOD
ASST. PROFESSOR
SU.I. RMC.
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Learning objectivesAt the end of this discussion, a student will be able to
• Define and enumerate types of burn and etiology
• Describe general pathology of burn and systemic
effects
• Calculate the surface area of a burn patient
• Enlist the priority in management of burn patient
• Calculate the fluid requirement of a burn patient
• Enumerate the local, regional and systemic
complications of burn
• Enlist the different options for dealing with common
complications of burn
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Burn wounds occur when there is
contact between tissue and an
energy source, such as heat,
chemicals, electrical current, or
radiation.
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The resulting effects of the
burn are influenced by the:
intensity of the energy
duration of exposure
type of tissue injured
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• A form of trauma.
• 50% of major burns occur during the formative
& productive years of life.
• Destruction of skin by heat leads to local and
systemic physiological alterations, therefore
management requires not only diagnosis and
treatment of local injury but also of the
derangements that occur in the hemodynamic,
metabolic, nutritional, immunological &
psychological homeostatic mechanisms.
• After successful treatment victims require a
recovery period extending over months or years.
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CLASSIFICATION OF BURNSACCORDING TO MECHANISM OF INJURY
THERMAL
1. Scalds
2. Fat burn
3. Flame burn
4. Cold thermal injury- frostbite
ELECTRICAL
CHEMICAL
RADIOTION
PHYSICAL Friction burn
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ACCORDING TO DEPTH OF INJURY
1. Superficial burns
I degree (Epidermal)
II degree (Superficial dermal,
Partial thickness)
2. Deep burns
II degree (Deep partial thickness,
Deep dermal)
III degree (Full thickness)
IV degree (Subcutaneous tissue
injury)
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ACCORDING TO SEVERITY
1. MINOR BURN
Partial thickness burn <15%
Full thickness burn <2%
2. MODERATE BURN
Partial thickness burn 15- 25%
Full thickness burn 2- 10%
3. MAJOR BURN
Partial thickness burn >25%
Full thickness burn >10%
Burn to primary areas (hands, feet, face, perineum, genitalia)
Inhalational injury
Any associated injury
Poor risk co-morbid factors
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Burn Classifications
• First Degree Burn
(Superficial Burn)
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Burn Classifications
• 2nd Degree
Burn
(Partial
Thickness
Burn)
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Burn Classifications
• 3rd Degree Burn
(Full Thickness burn)
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PATHOLOGY
• THERMAL DAMAGE TO THE SKIN
• DIRECT DAMAGE TO CUTANEOUS
VESSELS
• INCREASED CAPILLARY PERMEABILITY
• INFLAMMATORY HYPEREMIA
• ENORMOUS EXUDATION OF PROTIEN
RICH FLUID
• Contd:
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PATHOPHYSIOLOGY OF
LOCAL BURN INJURY
• Human skin can tolerate temperatures upto
40°C for brief periods.
• Jackson’s three concentric zones of thermal
injury.
CoagZone
Of
hyperemia
Zone
Of
stasis
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EFFECTS OF BURN INJURY
• LOCAL
1. Tissue damage ---Direct cell rupture
---Collagen denatured
---Damage to the peripheral microcirculation.
2. Inflammation
3. Infection --- local/ regional wound infection
--- bacteremia/ septicemia
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• REGIONAL
1. Circulation (limbs especially)
- Direct damage
- Oedema/ Eschar
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Escharotomy
• Circumferential full
thickness burns
– Chest
– Arms
– Legs
• Medial/Lateral incision
through burned skin
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• SYSTEMIC
1. Fluid loss
2. Inhalational injury
3. Gastric/ duodenal ( Curling’s) ulcer.
4. Immunosuppression
5. Catabolic response to trauma
6. UTI
7. Deep venous thrombosis
8. Pulmonary embolism
9. Renal/Multiple organ failure
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EVALUATION OF BURNS VICTIM
• ABC of trauma
• HISTORY --- mechanism of burning
possibility of associated injury
any co morbid factors
• EXAMINATION
specifically for inhalational injury
assessment of burn area--- in terms of %age
rule of nine for adults
assessment of depth--- Io = red, painful, no blisters
Superficial= erythema, blanching of
tissues, thin watery blisters
Deep= thick walled blisters, pale non
blanching wound bed, dry leathery
eschar, unreliable sensations.
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CLINICAL APPROACH TO A
BURN PATIENT
• DETERMINATION OF SEVERITY OF BURN
• ANALGESIA
• TETANUS PROPHYLAXIS
• FLUID RESUSCITATION
• PREVETIVE MEASURES
– PREVENTION OF INFECTION
– PREVENTION OF DVT
– PREVENTION OF GASTRITIS
– PREVENTION OF LOCAL COMPLICATIONS
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DETERMINATION OF
SEVERITY OF BURN
• SURFACE AREA: THE RULE OF NINE
• DEPTH: DEGREE OF BURNS
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RULE OF NINE
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Burn Assessment (cont.)
• Cannot use “adult” rule of 9’s for kids
• Head represents
– 19% BSA in a one year old,
– 13% in a six year old and
– 7% in an adult
• Thighs represent
– 11% BSA in a one year old
– 17% in a 12 year old
– 19 % in an adult
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3 Phases of Burn Management
–emergent (resuscitative)
–acute
–rehabilitative
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FLUID RESUSCITATION
• CRYSTALLOIDS
• COLLOIDS
• BLOOD TRANSFUSION
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THE PARKLAND FORMULA
• RINGER’S SOLUTION
• FIRST 24 HOURS’ TOTAL
REQUIREMENT:
2-4cc/kg/percent of burn
• HALF OF IT IN FIRST 8 HOURS
• OTHER HALF IN THE NEXT 16 HOURS
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MONITORING
• PULSE
• BP
• 1 Hrly URINE OUTPUT: TARGET
OUTPUT IS 0.5-1cc/kg/Hour
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EARLY COMPLICATIONS
• CHEST COMPLICATIONS
• BURN WOUND INFECTION
• ACUTE RENAL FAILURE
• ACUTE EROSIVE GASTRITIS
• CURLING’S ULCER
• CATABOLISM AND NUTRITIONAL
DEFECIENCY
• DVT
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LATE COMPLICATIONS
• SCAR PROBLEMS
– POST BURN CONTRACTURES
– HYPERAESTHETIC SCAR
– HYPERTROPHIC SCAR
– PRURITIC SCAR
– KELOIDS
– MARJOLIN’S ULCER
• CHRONIC CATABOLISM
• Contd:
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LATE COMPLICATIONS
• COSMETIC DISFIGUREMENT
• FUNCTIONAL DISABILITY
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PREVENTION OF LOCAL
COMPLICATIONS
• SPLINTAGE
• PHYSIOTHERAPY
• PRESSURE GARMENTS
• COMPRESSION BANDAGES
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COSMETIC DISFIGUREMENT
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POST BURN CONTRACTURE
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Example of a pressure garment
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KELOID
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