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Management of spinal trauma
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Management of Spinal Trauma
Dr Nola McPherson
SCGH Registrar Education
April 2014
Spinal anatomy
Evaluating a patient with suspected spinal injury
Broad management principles of spinal injury
Hypovolaemic vs neurogenic vs spinal shock
Overview
Anatomy
Location of Spinal Injuries
55% in cervical region (mobile & exposed)
15% in thoracic region (less mobile & protected)
15% in thoracolumbar region (fulcrum)
15% in lumbosacral region
Anatomy
Upper cervical region is wide from foramen magnum to lower part C3
- 1/3 die at scene from apnoea
- those that survive are usually neurologically intact when reach hospital
Anatomy
Below C3, diameter of spinal canal is smaller
- vertebral column injuries more likely to produce spinal cord injuries
Anatomy
Most thoracic spine fractures are wedge compression fractures without SC injury
If fracture-dislocation in thoracic spine region
– almost always complete spinal cord injury because narrow thoracic canal
Anatomy
Thoracolumbar junction
- inflexible thoracic spine meets strong lumbar spine making it vulnerable to injury
Anatomy
Multiple ascending and descending tracts in the spinal cord (not going to cover all of these today!)
THREE are easily clinically assessable
lateral corticospinal tract (descending tract)
spinothalamic tract (ascending)
dorsal columns (ascending)
Anatomy
Corticospinal tract – controls motor power on SAME sideSpinothalamic tract – transmits pain & temp sensation from OPPOSITE sideDorsal columns – carries position sense (proprioception), vibration sense and some light touch sensation from SAME side
Anatomy
Sensory Examination Dermatomes
Motor Examination Myotomes
Spinal Injury: Classification
Spinal cord injury may be categorised as:
Incomplete quadraplegia (incomplete cervical injury)
Complete quadraplegia
Incomplete paraplegia (incomplete thoracic injury)
Complete paraplegia
QUIZ– location of lesions and clinical presentations
COMPLETE Neurology
Total flaccid paralysis
Total anaesthesia
Total analgesia
No tendon reflexes
MUST WAIT UNTIL SPINAL SHOCK RESOLVED to diagnose
INCOMPLETE Neurology
Partial paralysis
Altered sensation (light touch or pin prick)
Sacral sparing
BETTER prognosis, may recover
Spinal Cord Syndromes
Different patterns of neurologic injury with the following syndromes:
Central Cord Syndrome
Anterior Cord Syndrome
Posterior Cord Syndrome
Inferior Cord Syndrome
Transverse Cord Syndrome
Brown-Sequard Syndrome
Cauda Equina Syndrome
Syringomyelia
Spinal Injury: Morphology
Spinal injuries can be described as:
1. Fractures
2. Fracture – dislocations
3. Spinal cord injury without radiographic abnormalities
4. Penetrating injuries
These injuries can be further categorized as stable or
unstable
Spinal Injury: Signs and Symptoms
Pain (and bony tenderness on examination)
Tingling, numbness and weakness in peripheries
Loss of sensation or paralysis below level of injury
Impaired breathing – C3/4/5 (diaphragm)
Incontinence
Priapism
Spinal Trauma: Primary Survey
Activate trauma team, triage to trauma bay
Move patient off spinal board as soon as clinically safe to do so
Airway maintenance with C spine immobilisation - definitive airway early if respiratory compromise
(injury higher than C6 need intubation and ventilation) - maintain hard collar, sandbag/bolsters and tape
Breathing and Ventilation - 15L /min oxygen (NRB) + ventilatory support
- monitor RR, respiratory effort, cough
Circulation with haemorrhage control
- if hypotension – hypovolaemic vs neurogenic shock
- assume hypovolaemia 1st : search for source blood loss + replace fluids
- if SC injury: guide fluid replacement with CVP monitoring (controversial)
- inotropes may be required - before IDC – perform rectal examination and assess rectal sphincter tone and sensation
Spinal Trauma: Primary Survey
Disability
- GCS /pupils/BSL
- look for paralysis/paresis/priapism/ anal sphincter
tone/bulbocavernosus reflex
Exposure/Environment
– keep warm (blankets, bair hugger, fluid warmer)
peripherally vasodilated, unable to regulate temp if injury above T4
Spinal Trauma: Primary Survey
Adjuncts to Primary Survey
Full non invasive monitoring (consider invasive later)
ECG
Trauma Xray series – lateral cervical spine, chest, pelvis
Bedside FAST scan (?sources of bleeding)
NGT
IDC
Focused AMPLE Hx
Ask
mechanism?
does your neck or back hurt?
can you feel me touching your fingers and toes?
can you move your hands and feet?
Spinal Trauma: Secondary Survey
Assess full spine
A. Log roll and palpate spine/paraspinal region
look for deformity/ crepitus/pain/contusions/ lacs/penetrating wounds
B. Assess for pain, paralysis and paraesthesia
locationneurological level
Spinal Trauma: Secondary Survey
Spinal Trauma: Secondary Survey
Test sensation
Test motor function
Test deep tendon reflexes
DOCUMENT carefully and REPEAT
Head to toe examination – assess for associated injuries
Adjuncts to Secondary Survey
Advanced spinal imaging
- CT scan (defines bony injury)
- MRI scan (defines neurological injury)
Consider CVP monitoring
Disposition
EARLY discussion with spinal specialists
- best imaging technique based on suspected injury
- management options - ?steriods – give or not give
Transfer to spinal unit
Examination For SC Level
Sensory Examination
Best Motor Examination:
TABLE 1: Determining the level of Quadraplegia
TABLE 2: Determining the level of Paraplegia
Table 1: Examination For SC Level
Action Nerve Root Level
Raises elbow to shoulder level Deltoid, C5
Flexes forearm Biceps, C6
Extends forearm Triceps, C7
Flexes wrist and fingers C8
Spreads fingers T1
Table 2: Examination For SC Level
Action Nerve Root Level
Flexes hip Iliopsoas, L2
Extends knee Quadriceps L3-4
Flexes Knee Hamstrings L4-5, S1
Dorsiflexes big toe Extensor hallucis longus, L5
Plantar flexes ankle Gastrocnemius, S1
Phases of Injury
Primary spinal cord Injury
– initial trauma direct injury to SC due to fractures, dislocations, haematomas, soft tissue swelling
Secondary spinal cord injury (later)
– due to ongoing mechanical instability or insults secondary to hypoxia and hypotension
Spinal Trauma: Management Principles
1. Immobiisation
2. Intravenous fluids
3. Medications
4. Early advise, prompt referral/transfer
ED acute care priority: avoid secondary spinal injury
Spinal Trauma: Management Principles
Immobilisation: protect from further spinal injury
cervical collar
long spinal board, bolsters and tape
remove from spinal board as soon as possible(ideally < 2hours, BEWARE pressure pts &
decubitus ulcers)
logroll maintaining neutral alignment of entire spine
(four or more helpers required with av 70kg patient)
After arriving at ED, at least 5% with spinal injury experience new symptoms or worsening of preexisting symptoms as a result of –
secondary spinal injury (ischaemia & progression of spinal cord
oedema)
poor immobilisation technique
Spinal Trauma: Management Principles
Fluid resuscitation• Maintenance fluids only unless shock
• If shocked – establish if hypovolaemic OR neurogenic
Insert IDC (during primary survey)• Monitor urinary output
• Prevent bladder distension
Insert NGT • Prevent gastric distension (+/- paralytic ileus)
• Prevent aspiration (sphincter paralysis)
Spinal Trauma: Management Principles
Medications Corticosteriods - insufficient evidence for routine use
Aimed at reducing extent of permanent paralysis
Most trials have used high dose methylprednisolone
Improved motor neurological outcome up to one year post injury if given within eight hours of injury
Given as bolus dose and then IV infusion for 24-48 hours
- 24 hour IVI if treatment commenced within 3 hours of injury
- 48 hours IVI if treatment commenced within 3-8 hours of injury
Spinal Trauma: Management Principles
Early studies (NASCIS I & II)* showed no increased complications or mortality if 24 or 48 hour IVI
More recent larger studies have raised concerns about increased risk of sepsis due to immunosuppressive effects
CI: heavily contaminated open injuries, other heavily contaminated injuries eg perforated bowel, sepsis
Consult with spinal specialist (use or not to use??)
More research needed
Analgesia
* National Acute Spinal Cord Injury Study I & II
Spinal Trauma: Management Principles
Transfer
Promptly after consultation with spinal specialist
If injury above C6 (can result in partial or complete loss of respiratory function) – intubate before transfer
Secondary Complications
Consider
DVT/PE
Pressure sores
Respiratory complications eg pneumonia
UTIs
Muscle length changes
Psychological problems
Hypovolaemic vs Neurogenic Shock
Hypovolaemic Shock Neurogenic Shock
Increase HR Decreased HR
Decreased BP Decreased BP
Cool extremities Warm extremities
American Spinal Injury Association (ASIA) Classification
Allows classification of spinal cord injury (standardizing terminology worldwide)
Based on
- severity of neurological deficit A=complete to E=normal
- neurological level most caudal segment with normal function
Neurogenic Shock
Neurogenic Shock
Mechanism
impairment of descending sympathetic pathways in the cervical or upper thoracic spinal cord (usually above T6)
Loss of sympathetic vasomotor tone
- peripheral vasodilation (visceral and lower extremity b/v) pooling of blood
HYPOTENSION
Neurogenic Shock
Loss of sympathetic innervation to heart (usually lesion above T1)
bradycardia (or at least failure of tachycardic response to hypovolaemia)
Neurogenic Shock
Management:
1. Hypotension1. crystalloid (250mL boluses) and IVI – may not improve BP despite massive infusion
(beware fluid overload and pulmonary oedema)
2. vasopressors eg noradrenaline, dopamine- after trial of volume replacement
Maintain organ perfusion: mentation, UO>0.5mL/kg/hr, MAP >65mmHg, warm peripheries
Consider CVP monitoring
Neurogenic Shock
2. Bradycardia1. atropine (0.6mg IV boluses, up to max 3mg)
2. avoid overzealous vagal stimulation with suction/NGT and ETT placement
Spinal Shock
Spinal Shock= transient loss of muscle tone and loss of reflexes
(flaccid areflexia) below the level of spinal cord injury
Not true shock
Spinal cord (temporarily) nonfunctional but not destroyed
No ANS or somatic reflexesFirst to return is bulbocavernosus and Babinski reflexes
Duration variable (hours to weeks)
Resolves with improvement in soft tissue swelling
Take Home Messages
Over half of spinal cord injuries occur in the cervical spine region (most vulnerable and mobile region)
C spine immobilisation in trauma = spinal board (initially), hard collar, sandbags/bolster and tape
Consider early intubation and ventilation with injuries higher than C6 (altered LOC, regurgitation, cervical haematomas) – hypoxaemia is late sign of deterioration
Follow ATLS ‘A B C D E’ algorithm in spinal trauma – aim is to limit secondary spinal cord injury
Take Home Messages
Neurogenic shock is a triad of hypotension, bradycardia and peripheral vasodilation
In trauma patients, neurogenic shock is a diagnosis of exclusion
Watch over zealous fluid treatment – if hypotension not improving with fluid resuscitation, consider neurogenic shock
EARLY discussion with spinal specialist the use of noradrenaline (for hypotension) and steroids (remains controversial) in spinal trauma
Question and discussion time
Thank you
References
Fildes J, et al. Advanced Trauma Life Support Student Course Manual (9th edition), American College of Surgeons 2012.
Image of Vertebral Column taken from: http://upload.wikimedia.org/wikipedia/commons/5/54/ Gray_111_-_Vertebral_column-coloured.png
Image of Major Tracts in Spinal Cord taken from:http://www.dontbeasalmon.net/archives/2012/01/week-222-spinal.html
References
Image of Dermatomes taken from:http://commons.wikimedia.org/wiki/File:Dermatomes_and_cutaneous_nerves_-_anterior.svg
Image of Myotomes taken from: https://www.pinterest.com/pin/174162710563226309/
Image of Tetraplegia/paraplegia spinal levels taken from: http://quizlet.com/23549824/spinal-cord-injury-med-surg- exam-2-flash-cards/
References
Trauma Spinal Injury taken from: https://www.lifeinthefastlane.com/trauma-tribulation-016/
ASIA Impairment Scale taken from: http://www.asia-spinalinjury.org/elearning/ ISNCSCI_ASIA_ISCOS_low.pdf
BrackenMB.Steroidsforacutespinalcordinjury.CochraneDatabaseofSystematicReviews2012,Issue1.Art.No.:CD001046. DOI: 10.1002/14651858.CD001046.pub2.
References
Cameron P, Jelinek G, Kelly AM, Murray L, Brown A. Textbook of Adult Emergency Medicine. 3rd Edition. Churchill Livingston Elsevier 2009.