acute burn care - rose conference · acute burn care rga rose conference minneapolis, mn thursday,...
TRANSCRIPT
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Acute Burn CareRGA ROSE Conference
Minneapolis, MN
Thursday, September 14, 2017
0800-0915 hrs
Ryan M. Fey, MD
Director, HCMC Burn Center
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Disclosure
• Disclosure Policy: It is the policy of Hennepin County Medical Center to ensure balance, independence, objectivity and scientific rigor in all its sponsored educational activities. All faculty participating in sponsored programs are expected to disclose to the audience any real or apparent conflicts of interest to the content of their presentation. Ryan Fey, MD has indicated that he has no financial relationships to disclose related to this presentation.
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Objectives
• Discuss the nature and epidemiology of burn injuries• Discuss emergent/urgent burn evaluation and
management• Discuss follow-up care and referral/transfer• Discuss management of frostbite injuries
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Skin Anatomy
• Epidermis
• Dermis • Dermal Appendages• Subcutaneous Tissue
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Skin Function
• Protects from infection and injury• Regulates body temperature• Prevents loss of body fluids• Sensory contact with environment
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Burn Definition
• Burn: An injury to tissue usually caused by heat but also by abnormal cold, chemicals, poison gas, electricity, or lightning.
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Burn Wound Zones
• Zone of Coagulation• Dead and stays dead regardless of Rx
• Zone of Stasis• Area of vessel contraction• Inflamed• Ischemic• ± viable depending on care
• Zone of Hyperemia• Vessel dilatation• Capillary permeability• Viable with good care and no infection
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Burn Depth• Four categories
• First Degree • Second Degree• Third Degree• Fourth Degree
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First Degree Burn
(Superficial)
• “Sunburn” injury• Epidermis only • No scarring• No disfigurement
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Second Degree Burn
(Partial-Thickness)
• Entire epidermis and part of dermis• Pink and blistered • Most painful• Heals in 2-3 weeks
• Dermal Appendages• Pigmentation changes• Minimal scarring• +/- skin grafting
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Third Degree Burn
(Full-Thickness)
• Entire dermis and epidermis• White, dry appearance• Coagulated vessels • Scarring and disfigurement• Heals by contracture• Skin grafting indicated
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Fourth Degree Burn
(Deep Full-Thickness)
• Burn into underlying structure• Often charred• Disfigurement• Disability
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Epidemiology
• Incidence• 1.25 Million injuries / year• 450,000 patients seek treatment per year• 40,000 patients hospitalized annually• 3,400 deaths from burn injuries• 96.1% overall survival rate
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Epidemiology
• Demographics• Gender
• 69% Male• 31% Female
• Ethnicity• 59% Caucasian• 19% African-American• 15% Hispanic• 7% Other
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Epidemiology
• Injury Types• 44% fire/flame• 33% scald • 9% contact• 4% electrical• 3% chemical• 7% other
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Epidemiology
• Location• 69% Home
• Kitchen• 9% Occupational• 7% Street/Hwy• 5% Recreational/Sport• 10% Other
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Survival
• 96.1% Survival• Lethal Dose – 50 (LD50)
• 49% Total Body Surface Area (TBSA) in 1950’s• 90 – 95% TBSA today
• 75% of non-survivors perish at the scene• Majority are structural fires
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High Risk Groups
• Children• Heavy and light-for-age groups overrepresented• Scald injuries most common
• Elderly • Flame injuries most common• Pre-existing conditions
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High Risk Groups
• Disabled• Scalds most common• Functional limitations
• Socio-economic status• Minority children 3x death rate in house fires• Racial differences fade as income increases
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High Risk Groups
• Chemical intoxication• Risk-taking behavior• Impaired responsiveness• 40% of house fire deaths
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Objectives
• Discuss the nature and epidemiology of burn injuries• Discuss emergent/urgent burn evaluation and
management• Discuss follow-up care and referral/transfer• Discuss management of frostbite injuries
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Emergent Management
• Stop the burning process• Initial resuscitation flows just like trauma
• Airway• Breathing • Circulation• Disability• Exposure• Fluids
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Airway/Breathing
• Inhalation Injury• Not direct thermal injury
• Except steam• Toxic smoke molecules
• CO, Cyanide, HCl, Phosgene, NH3, Sulfur dioxide, Acrolein, Formaldehyde, Isocyanate
• Acrylonitriles• Synergy of CO and CN. Also CO and H2S
• Asphyxiation
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Airway/Breathing• Inhalation injury airway pathology
• Increased mucous secretion• Impaired ciliary clearance• Proteinaceous exudate• Mucosal sloughing• Bleeding• Casting, obstruction, ball-valve• Increases mortality 20-50%
• ALI/ARDS
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Airway/Breathing• Smoke Inhalation
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Inhalation Injury
• Carbon Monoxide (CO) poisoning• 200x > affinity for Hgb than O2
• SpO2 abnormally elevated (normal on monitor)• Half life
• Room air: 250 mins• 100% FiO2: 40-60 mins• 3 atm HBO: 30 mins
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CO PoisoningCOHb Saturation (%) Symptoms
0-9% None10-20% Headache, vasodilation20-30% Headache, pulsating temples
30-40% Severe Headache,nausea/vomiting, weakened sight, prostration
40-50% As above, increased RR and HR, Asphyxiation
50-60% As above, Coma, Seizure, Cheyne-Stoke breathing
> 60% Coma, Seizure, cardiopulmonary collapse, death
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Inhalation Injury• Cyanide (CN) poisoning
• Commonly produced by synthetic compounds• Binds to cytochrome oxidase
• Blocks cellular respiration• Synergy with CO
• Effects within seconds of inhalation• Persistent acidosis• Hydroxycobalamine (B12 precursor) 5 mg IV x1
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Inhalation Injury
• Diagnosis• History
• Enclosed environment• Escape impeded• Loss of consciousness
• Exam• Hoarseness or voice change• Barking cough• Sooty airways, carbonaceous sputum• Burns inside mouth
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Inhalation Injury
• Airway management (if indicated)• SECURE!!
• Protective vent settings• Pulmonary toilet• Inhaled medications
• Bronchodilators• Heparin• Acetylcysteine
• Treatment of CO and CN poisoning• 100% FiO2• HBO treatment• Cyanide antidote (hydroxycobalamine)
• Percussive ventilation• ECMO
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Airway/Breathing• Indications for Intubation
• Hoarseness, voice change• Stridor• Large TBSA burn (>50%)• Extensive facial burns• Burns inside mouth• Significant burn edema• Signs of obstruction• Difficulty swallowing• Using accessory muscles• Inability to handle secretions• Respiratory fatigue• Poor oxygenation/ventilation• Very large doses of narcotics• Impaired level of consciousness, not protecting• NOT singed nasal hairs
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Emergent Management
• Cool the burned tissue• Not ice!• 3-5 minutes in cool water• Smaller wounds
• Estimate severity of wounds• Quantifiable • Guides resuscitation
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Emergent Management• “Rule of Nines”
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Emergent Management• Method of Lund and Browder
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Burn Shock
• Invariably seen if >33% TBSA• Treatment threshold ~20%• Age dependent
• Systemic edema possible at 10% TBSA• Combined shock state
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Burn Shock
• Hypovolemia (burn edema)• Altered Starling variables• Altered capillary permeability
• Decreased cardiac output• Preload reduction• Decreased contractility• Increased afterload
• Later SIRS transition
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Fluid Resuscitation
• Vascular access• Large bore IVs• CVC for larger burns• Through injured tissue• SECURED
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Fluid Resuscitation• Restore intravascular volume
• Hours to days• Judicious• Support end organ perfusion• Avoid compartment syndromes• Formulas
• Crystalloid (Parkland, Mod Brooke)• Colloid (Evans, Slater)• Hypertonic (Warden, Demling)
• NO BOLUS THERAPY!!!
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Fluid Resuscitation
• Soaker hose analogy
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40
Fluid Resuscitation• Initial fluid resuscitation rates:
• 5 years old and younger–LR @ 125 ml/hr
• 6-14 years old – LR @ 250 ml/hr
• 15 years and older – LR @ 500 ml/hr
• Royally messed up – LR @ 750 ml/hr
• Ongoing resuscitation• Adults: 2 mL/kg/% TBSA over first 24 hours• Children: 3 mL/kg/% TBSA over first 24 hours• Rhabdo/Electrical: 4 mL/kg/% TBSA over first 24 hours
• No Bolus therapy!!
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Fluid Resuscitation• Over resuscitation Compartment Syndrome Death
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Emergent Management
• Foley catheter• NGT decompression• Maintain body temp• Secondary survey• Trauma evaluation• Simple, sterile dressings
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Emergent Management
• Compartment syndromes• The “Five P’s”• 30 mmHg or greater• Repeated measurement• Escharotomy
• Full-thickness• Circumferential
• Fasciotomy• Over-resuscitation• Failing resuscitation• Electrical injury
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Emergent Management• Escharotomy most common early intervention
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Emergent Management
• Special Circumstances• High voltage
• Trauma• Compartment syndrome• Rhabdomyolysis• Cataracts
• Lightning• Cataracts• Cardiac monitoring?
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Emergent Management
• Special circumstances• Chemical Injury
• Brush off dry chemical• Irrigate 30 minutes• No acid/base reversal
• Hydrofluoric acid• Topical calcium• Systemic calcium• Intra-arterial calcium• Amputation??
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Objectives
• Discuss the nature and epidemiology of burn injuries• Discuss emergent/urgent burn evaluation and
management• Discuss follow-up care and referral/transfer• Discuss management of frostbite injuries
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Referral Criteria• > 10% TBSA• Face, hands, feet, genitals, perineum, major joints• Third degree• Electrical, including lightning• Chemical burns• Inhalation injury• Pre-existing conditions• Concomitant trauma• Pediatrics• Special social, emotional, rehab needs
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Prep for Transfer
• SECURE all lines/tubes• Dry sterile covering to wounds• Imaging and labs• Tetanus booster• Continuous IV fluids
• < 5 yo: 125 mL/hr• 6-14 yo: 250 mL/hr• 15 yo and up: 500 mL/hr• Messed up adults: 750 mL/hr
• Air vs. ground• May admit directly to Burn Center vs ED
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Prep for Clinic• Bacitracin/Adaptic (B&A) dressings
• Silvadene alters wound appearance, pseudoeschar• SSD OK for deep or possibly infected wounds
• Supplies to change daily• Pain medication• Tetanus booster• Call or provide clinic number 612-873-2912• Seen within a week (usually < 72 hrs)
• Partial-thickness seen every 7-10 days• Indeterminate thickness evaluated for 2-3 weeks• Full-thickness scheduled for OR
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Acute Burn Care
• Burn wound management• Local wound care• Skin grafting• Excision and closure• Advanced reconstruction
• Tissue flaps• Tissue expansion
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Burn Dressings
BacitracinAdaptic Mepitel
Kerlex Gauze Stockinette Coban
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Burn Dressings
Acticoat & Acticoat Flex
Mepilex Ag Transfer
Mepitel
Mepilex Ag
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• Full thickness wounds• Epithelial migration
• 1 mm/day• Contraction
• Quarter-sized wounds• Surgery
Epithelialization
• Partial thickness wounds• epidermal appendages
• sweat ducts• hair follicles
?
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Contraction vs. Contracture
• Fibroblasts convert to myofibroblasts
• surrounding skin pulled inward• open wounds shrink closed• advantage
• sensate skin• disadvantage
• contracture
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Skin Grafting• Burn wound is excised• +/- temporary coverage• Donor skin harvested• Graft applied to burn wound• Ironclad postop dressing
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Skin Grafting• Sheet graft vs. meshed graft
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Skin Grafting• Large burns
• Multiple OR trips• Early excision • Donor sites
• Temporary coverage• Porcine xenograft• Human allograft• Integra
• Early postoperative period• Secure dressing• Immobilization• 5-7 day dressing change
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Recovery/Healing• Average stay ~7 days• Large burns may stay months• Multidisciplinary team
• Physical therapy• Occupational therapy• Nutritionist• Trauma psychology• Chaplaincy• Pharmacy• Speech Pathology• Residents• Physician assistants• Nursing• And more…
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Suspected Abuse Cases
• History, exam don’t match• Stereotypical exam findings
• Dip line• Flexor, plantar sparing• Absent splash marks• Perineal, genital, buttock• Other injuries
• Increasing elder abuse• Transfer via EMS
• Even minor burns• Child maltreatment team, CPS evaluations
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Objectives
• Discuss the nature and epidemiology of burn injuries• Discuss emergent/urgent burn evaluation and
management• Discuss follow up care and/or transfer• Discuss management of frostbite injuries
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Frostbite/Frostnip
• Average of ~25 severe frostbite admissions per year (many more minor cases)
• Incidence increased dramatically approaching 0ºF
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Frostnip
• Pain• Pallor• Numbness
• Completely reversible with warming• No resulting tissue loss
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Frostbite• Mechanism of injury
1. Direct freezing of the tissues2. Reperfusion injury, thrombosis
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Frostbite
• Initially may present:• Hard• Cold• White • Numb• Clumsy
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Frostbite• Following thawing
• Mottled• Dark or bright red• Can be extremely
painful• Blistering
• Appear over hours to days
• Character will change after 12-24 hours
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Frostbite Classification
• 1st Degree• Hyperemia/edema• Non-blistered
• 2nd Degree• Large clear blisters• Partial thickness skin necrosis
• 3rd Degree• Hemorrhagic blisters -> dark eschar• Full-thickness & subcutaneous skin loss
• 4th Degree• Full-thickness skin necrosis involving bone,
tendon or muscle
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Frostbite Management
• Do not begin rewarming in the field• Unless ability to keep
thawed is certain
• Rapid rewarming • 40ᴼC for 30-45 min.
• Mechanical protection• Update tetanus• Analgesia
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Frostbite Management
• Thrombolytics if indicated• Scheduled Ibuprofen & Neurontin• Wound care
• Blisters• Aloe Vera/Dermaide• Bed for the first 24-72 hours
• PT, OT, Nutrition• Manage withdrawal, chem dep
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Thrombolytics
• No perfusion after warming
• Positive bone scan• Alteplase IV
• 0.15 mg/kg load• 0.15 mg/kg/hr for six
hours• Lovenox x 7 days• Repeat bone scan at
24 hours
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Frostbite Management
• Local wound care during demarcation• Long demarcation period
• “Frostbite in January, amputate in June”• Skin grafting and/or amputation if indicated• Prosthetic management
• Preop prosthetist consultation• Chronic pain management• OT/PT
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Objectives
• Discuss the nature and epidemiology of burn injuries• Discuss emergent/urgent burn evaluation and
management• Discuss follow up care and/or transfer• Discuss management of frostbite injuries
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Advanced Burn Life
Support (ABLS)
• HCMC EMS Education• Charlie Moen• 612-873-2048• [email protected]
• HCMC Dept. of Surgery• 612-873-2811
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Questions??
Facebook.com/HCMCBurnCenter
Twitter.com/HCMC_Burn