crush injury
DESCRIPTION
case presentationTRANSCRIPT
Crush Injury
By Che Haniff B Che Hassan
Supervisor Dr Azahari
Overview
Case studyDefinitionsHistoricallyCausesPathophysiologyClinical Management
Case StudyMrs. X45y.o , malay, femalePreviously NKMIWorks as food vendor
c/oAlleged industrial injury by sugarcane machine around 12pm (13/12/13)Trying to carry and pull the sugarcane, suddenly she slipped on her right foot and her left hand landed on the sugarcane machine.Her left hand stuck in the working machine for about 5min until a passerby stopped stopped by and turned off the machine
Post trauma sustained pain and bleeding at left hand
Total amputated at left hand exposing muscle and tendon
Was brought to ED HSNZ immidiately
Done wound irrigation with 3L of waterWas given antibiotic iv cefuroxime 1.5g statIv flagyl 500mg stat
o/eAlert, concious, not tachypneicnot tachycardic
Bp 150/56Pr 92T 37Spo2 100%
Cvs s1s2 drnmLungs clearPa soft, non tender
Examination of left upper limbtotal amputated at metacarpal area of left wristExposing muscle and tendonDistal part only connected by 2 flexor tendonsMinimal bleedingTotal crush on dorsal aspect of left hand
Case Study
Total amputation at metacarpal bones of left wrist with total crushed of distal part
Blood ixHb: 13.6/ Twc 10.8/ Plt 299Busec: 4/132/4.1/100/45PT/APTT: 13.5/27.4
Plan:For left wrist disarticulationFor wound irrigationFor triple abx, iv cefuroxime, iv gentamycin and iv flagylMonitor vs in wardTo notify OT
s/b Mr Hadizi
Explained regarding findings and plan.Distal part was not salvageable and to go for operation. Patient and family understood and
agreed to go for op as plan
Operative recordPost traumatic amputation over carpo-metacarpal point with crush injury of distal part of left handOp: wrist disarticulation of left hand
Op findings:Traumatic amputation over carpo-metacarpal point with crush injury of distal part of left handAmputation done at level of radio carpal jointSoft tissue healthyUnable to close the skin
EBL minimalTorniquet: 35mins
DefinitionDefinition
Definitions
• A crush injury is direct injury resulting from a crush, injury by an object that causes compression of the body. This form of injury is common following a natural disaster or after some form of trauma
• A crushing injury can cause either Compartment Syndrome (CS) or Crush Syndrome
• A crush syndrome is the systemic manifestation of muscle cell damage, resulting from pressure or crushing.-Also known as traumatic rhabdomyolysis
resulting inMuscle Cell Death and Muscle Cell Injury
History
In 1910 Myer-Betz Syndrome, German physician.Triad: Muscle Pain, Weakness, Brown Urine.
World War IIDr Bywaters described patients during London
Bombings (Battle of Britain 1941).Oliguria, pigmented casts, limb oedema, shock and
death.In 1943, in animal models, Bywaters & Stead
identified myoglobin as the offending agent, and formulated the first treatment plan.
History
In 1950 Korean War, dialysis reduces mortality rate from 84% to 53%.
Natural Disasters – Earthquakes1976 Tangshan (near Beijing): 20% of 242,000
deaths due to crush syndrome.1988 Spitak (Armenia)In 1995, British nephrologists introduced the
Disaster Relief Task Force with the goal to prevent acute renal failure.
1999 Marmara (Turkey): 7.2 Richter scale earthquake. 12% hospitalised patients had renal failure, 76% received dialysis, 19% fatality rate.
Causes
Causes - Traumatic
Trauma and compression• building collapse • natural disasters(earthquake)• construction accidents• MVA• Industrial injury
Phatophysiology
Mechanism of Muscle Cell Injury and Death:1. Involvement of a muscle mass2. Prolonged compression3. Vascular compromise
Crush InjuryMuscle ischemia and Necrosis
from Prolonged Pressure(Local effects)
Crush Syndrome (Systemic Effects)
Compartment Syndrome
Fluid Retention in Extremities
(third spacing)
Hypotension
Myoglobinuria
Renal Failure
Metabolic Abnormalities (electrolytes)
Cardiac Arrhythmias
Secondary Complications
Toxins and Their Effects• Amino acids-dysrythmia• Creatine phosphokinase CPK, marker• Free radicals- oxygen reitroed further damage• Histamine-vasodilation, bronchoconstriction• Lysozymes-cell-digesting enzymes• Myoglobin-renal failure• Phosphate and Potassiumhyperkalmia causes
dysrhythmias• Purines (uric acid)-further renal damage
• Revascularization• Fluids trapped in damaged tissue• Oedema of affected limb• Haemoconcentration and shock• Myoglobin, potassium, phosphate enter venous
circulation
Clinical manifestations
· Skin injury –may be subtle.· Swelling –usually a delayed finding.· Paralysis –may cause crush injury to be mistaken
as a spinal cord injury.· Paresthesias, numbness –may mask the degree of
damage.· Pain –often becomes severe upon release.· Pulses –distal pulses may or may not be present.· Myoglobinuria –the urine may become dark red or
brown ,indicating the presence of myoglobin.
Complications
Early (<12hrs)HypovolaemiaHyperkalaemiaHypocalcaemiaCardiac arrhythmiasCardiac arrestCompartment syndrome
Late(12-72hrs)Acute renal failure DICsepsis
Lab findings
CK n 45-260U/LRises within 12hoursPeaks 1-3 daysDeclines 3-5days after cessation of muscle injury
CK-peak
Huerta-Alardin et al :CK>5000U/L serious muscle injury, related to renal failure
Gonzales et al:
>10000U/L related to ARF
Brown et al :2083 trauma ICU admission,85% abn CK (>520)
74 of 382 <5000U/L developed RF(8%) 143 of 1701 >5000U/L developed RF(19%)Renal failure defined peak creatinine >2mg/dl
Other muscle markers
Measuring myoglobin level in serum or urineAppears in urine when plasma concentration
exceeds 1.5mg/dlUrine becomes dark red –brown colour >100mg/dlMyoglobin has short T1/2 (2-3hours)Serum level return to normal after 6-8hours
Lab tests
Raised U&E Hyperkalaemia hypocalcaemia hyperphosphataemia uric acid
Management
Primary Survey
A irway B reathing C irculation D isability E nvironment
Airway
• Suctioning/Mechanical removal • Chin lift/jaw thrust maneuver • Oropharyngeal/Nasopharyngeal airway • Endotracheal intubation • Surgical airway • Tracheostomy
Breathing
• Inspection • Palpation • Percussion • Auscultation
Circulation
• External haemorrhage-direct pressure• Internal haemorrhage-skin colour, pulse, blood pressure • 2 large bore IV lines • Fluid resuscitation
Disability • Level of consciousness-GCS -Eye opening(4) -Best verbal respone(5) -Best motor response(6) • Pupillary response• Movement
Exposure • Head to toe examination
FluidsWhen
if possible before the crush is relievedWhat
isotonic crystalloids are favoured normal saline preferred (consensus meeting crush syndrome 2001-Edinburgh) (R/L have 4 mEq K )
Children 10-20ml/kg/hrUrine output -.50ml/hr -200mls/hrChildren 2mls/kg/hr
CVP –Smith et al suggest fluid bolus until a sustained increase in CVP (>3mmhg after 15 min )
Stop fluids if sign of fluid overload
Alkalinisation using bicarbonate
• Alkalinisation increases the solubility of myoglobin and promotes its excretion .
• Bicarbonate is used to raise the urine pH to 6.5 thereby increasing solubility of Haeme pigments
• prevent renal failure• Correct the acidosis (blood pH0
Mannitol
• protect the kidneys from the effects of rhabdomyolysis
• increases extracellular fluid volume• increases cardiac contractility
Dialysisif patient oliguric, fluid overloaded, consider dialysis
Despite optimal treatment ,daily haemodialysis or haemofiltration may be necessary
Remove urea and potassium
Free radical scavengers and antioxidants• administration of free-radical scavengers used in
the early treatment of crush syndrome to minimize the amount of nephrotoxic material released from the muscle
• Pentoxyphylline is a xanthine derivative used to improve microvascular blood flow. In addition, pentoxyphylline acts to decrease neutrophil adhesion and cytokine release
• Vitamin E , vitamin C , lazaroids (21-aminosteroids) and minerals such as zinc, manganese and selenium all have antioxidant activity and may have a role in the treatment of the patient with rhabdomyolysis
HYPERKALEMIAtreating hyperkalemia· Insulin and glucose.· Calcium –intravenously for life- threatening dysrhythmias .· Beta- 2 agonists – albuterol, metaproterenol sulfate (Alupent),etc.· Potassium - binding resins such as sodium polystyrene sulfonate
WOUND MANAGEMENT
should be cleaned, debrided and covered with sterile dressing
Gustilo Anderson
Hyperbaric Oxygenincreased oxygen transport capacity of the blood
The use of this modality will be limited because of lack of access to hyperbaric chambers.
Traumatic Amputation
• absolute indication for primary amputation is an irreparable vascular injury in an ischemic limb
• Mangled extremity severity score
Compartment syndrome •Defined as an “increased pressure within a confined space that leads to micro-vascular compromise and ultimately to cell death as a result of oxygen starvation”•Acute compartment syndrome can be have disastrous consequences, including paralysis, loss of limb or loss of life
Secondary complication
Increased interstitial pressure in a close fascial compartment leading to microvascular compromise and cellular death
Pressures measuring >30mmhg – surgical assessment
DBP-compartment =< 30 – indication for fasciotomy
Take home message
High index of suspicionOn scene treatment importantAggressive fluid treatmentAdequate monitoring Recognition and early treatment of complications
References
Oda, Jun MD; Tanaka, Hiroshi MD; Analysis of 372 Patients with Crush Syndrome Caused by the Hanshin-Awaji Earthquake,J of trauma:Volume 42(3), March 1997, pp 470-476
Gonzalez, Dario MD ,Crush syndrome,J of critical care:Volume 33(1) Supplement, January 2005, pp S34-S41
Ana L Huerta-Alardín1, Joseph Varon2 and Paul E Marik .Bench-to-bedside review: Rhabdomyolysis – an overview for clinicians; Critical Care 2005, 9:158-169Crush Injury and Crush Syndrome: A Review
Smith, Jason MD; Greaves, Ian Crush Injury and Crush Syndrome: A Review .J of trauma:Volume 54(5) Supplement, May 2003, pp S226-S230
Brown,carlos V MD:Rhee,Peter MD ;Preventing Renal Failure in Patients with Rhabdomyolysis: Do Bicarbonate and Mannitol Make a difference . J of Trauma :Vol 56 ,June2004,pp1191-1196
A practical approach to anaesthesia for emergency surgery
Thank You