tuttleman lecture reason for hope: predicting outcome ...reason for hope: predicting outcome after...
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Reason for Hope: Predicting Outcome after Catastrophic Injury—Spinal Cord Injury
Christopher Formal MDMagee Rehabilitation
October 14, 2016
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Reason for Hope: Predicting Outcome after Spinal Cord Injury
•I. Introduction•II. Neurological recovery•III. Breathing & walking•V. Residence•VI. Future research
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IntroductionI. How to structure outcome, and hope II. Upper motor neuron/lower motor neuron basicsIII. Classification of SCI
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How to Structure Outcome, and Hope
Dr. Staas:
Medical
Functional
Psychosocial
WHO:
Impairment
Disability
Handicap
Patient:
I can’t move
I can’t breathe …
I am far from home
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IntroductionI. How to structure outcome, and hope II. Upper motor neuron/lower motor neuron basicsIII. Classification of SCI
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UMN/LMN Basics• Voluntary motion originates in the brain• Pathways cross to the other side of the body• This crossing occurs up high• The pathway has two neurons• First neuron (UMN) is up in the brain—its axon
crosses, and goes to the spinal cord where …• It synapses with the second neuron (LMN)
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UMN vs LMN Injury•They both involve weakness—•UMN injury yields spasticity•LMN injury yields flaccidity•With UMN Injury, electrical stimulation (of nerve or muscle) will cause muscle contraction
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IntroductionI. Structure for outcomes and hope II. Upper motor neuron/lower motor neuron basicsIII. Classification of SCI
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Description of spinal neurological deficit
•It is “simple” (no cranial nerves, etc.)•Does not depend on imaging studies•Two main steps—get the raw data, and then
•Put the data together to describe the injury
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What is the raw data?
•Sensation •Motor function•To a lesser extent--reflexes
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ASIA Classification• Many different systems to classify SCI• ASIA --interdisciplinary• 10th and Locust• Level—everything is normal down to (and
including)—the level, thus generally the lower in the cord the better
• Severity (“AISG”) is the reverse of school; E is normal, while A is no sparing of function
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ASIA Impairment Scale Grade
• A: No motor or sensory function below (technically no sacral sparing)
• B: Some feeling present, but no motor function• C: Some spared motor function, but weak• D: Some spared motor function, not normal, but fairly
strong (3/5 and better)• E: Normal
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asia-spinalinjury.org/•Reviews anatomy and pathophysiology•Goes over the exam•Provides a video course on performing the exam
•Instructional tests
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Reason for Hope: Predicting Outcome after Spinal Cord Injury
•I. Introduction•II. Neurological recovery•III. Breathing & walking•V. Residence•VI. Future research
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What about neurological improvement after SCI? What is in the literature?• First—people are NOT expected to decline; decline would need
investigation• What is expectation for improving from ASIA Impairment Grade A?
B? C?
• (Marino, Arch Phys Med Rehabil, 2011)
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1 year A
1 year B
1 year C
1 year D
1 year E
Admit as AAdmit as BAdmit as CAdmit as D
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1 year A %
1 year B %
1 year C %
1 year D %
1 year E %
Admit as A 78 12 6 3 0Admit as BAdmit as CAdmit as D
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Prognosis for ASIA A•Most stay “complete”•However—22% do become incomplete within the first year, and of these a minority improve to ASIA D
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1 year A %
1 year B %
1 year C %
1 year D %
1 year E %
Admit as A 78 12 6 3 0Admit as B 3 46 27 24 0Admit as CAdmit as D
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Prognosis for ASIA B•(people should not decline)•Over half will become motor incomplete•A quarter will progress to ASIA D—thus functional strength in the lower limbs
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1 year A %
1 year B %
1 year C %
1 year D %
1 year E %
Admit as A 78 12 6 3 0Admit as B 3 46 27 24 0Admit as C 0 1 22 77 0Admit as D
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Prognosis for AIS C•(should not decline)•Over half will improve to ASIA D, thus functional strength in the lower extremities
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1 year A %
1 year B %
1 year C %
1 year D %
1 year E %
Admit as A 78 12 6 3 0Admit as B 3 46 27 24 0Admit as C 0 1 22 77 0Admit as D 0 1 1 84 14
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Effect of time from injury …
•Clearly a person with ASIA B injury of one day’s duration has a greater likelihood of improving to C or D than a person with ASIA B injury of one year’s duration
•BUT we don’t know much about this quantitatively; we don’t have a chart to use
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Reason for Hope: Predicting Outcome after Spinal Cord Injury
•I. Introduction•II. Neurological recovery•III. Breathing & walking•V. Residence•VI. Future research
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Breathing•Usually the lungs are healthy•If presented with air, the lungs will function properly—taking in oxygen and getting rid of carbon dioxide
•Problem is getting the air there—ventilation; a motor problem
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Ventilation•Moving the air in—inhalation—diaphragm•Moving air out—exhalation-especially coughing—lower muscles
•One can get along well with just ability to inhale—thus, if phrenic nerve is working
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UMN vs LMN Injury• They both involve weakness—• UMN injury yields spasticity• LMN injury yields flaccidity•With UMN Injury, electrical stimulation (of nerve or muscle) will cause muscle contraction
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Phrenic nerve pacingImplanted system; nothing through the skinChallenging surgeryDiaphragm must be conditioned
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Diaphragm Pacing System
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“DPS”•Relatively easy to place …•Diaphragm must be conditioned•A bridge, or a destination•Parameters are managed externally•“Percutaneous”
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Reason for Hope: Predicting Outcome after Spinal Cord Injury
•I. Introduction•II. Neurological recovery•III. Breathing & walking•V. Residence•VI. Future research
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Early prognosticators:Crozier Arch Phys Med Rehabil 91
•Sparing of pin sensation predicts better prognosis for gait than touch sparing only.
•Why …
Crozier Arch Phys Med Rehabil 91
•Better than 3/5 quad at three months predicts gait
•Why …
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Early prognosticators
Penrod, Arch Phys Med Rehabil 90
•Age below 50 is a good prognosticator for persons with a similar SCI syndrome
•Why …
Middendorp, Lancet 2011
•Confirmed age, quads•Also, plantar flexors—why?
•Also touch sense L3 and S1
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Problems …•Varying definition of ambulation (note WISCI scale)
•What “we” need is information about prognosis for people based on findings sometime after injury
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Data for persons at 1 month …•For 13 persons with SCI, ASIA B tetraplegia at 1 month—
•None were community ambulators at 1 year•Some did regain some LE motors—these were people with preservation of pin sensation
(Waters, Arch Phys Med Rehabil, 1994)
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BUT …• People with ASIA C injuries often did well• Most of those with a “summed LE motor score” of 10
or better, as 30 days, were able to walk in the community at 1 year
• Perspective: 10 lower limb muscles; having trace function in all of them would give a LE score of 10
• Waters et al, Arch Phys Med Rehabil 1994
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A Memorable Case …•15yo boy was hurt wrestling—with tetraplegia.•Presented for rehabilitation at day 16, with C6 level, sensory incomplete tetraplegia, no motor function in lower limbs. (“ASIA B”)
•Began to regain lower limb strength at day 51.•Five months after injury, walking/running without assistance or device.
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Body weight supported training
• Stegosauruses and babies• Cats• Hess’s Law• Body weight supported training
uprightsensory inputupper limbs free
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Traditional Body Weight SupportArms free/input through feet/uprightTherapist input to help facilitate responseLabor intensive in numbers of personnel and in exertionPhysically vigorous
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Robotic Suspended Training
Arms free/input through feet/uprightLess labor intensive“Smooth”
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Overland Suspended Gait Training
Arms free/input through feet/uprightAllows overland training with obstaclesAllows some lateral motion
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Three modalities …
•Unusual to have all of them in one setting•No paradigms for how to utilize with different persons
•Benefits extend well beyond ambulation•Appropriate for training with persons with other impairments
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External Powered Skeletal SupportCan substitute for A to B mobility; can replace, for certain situations, a wheelchairNot truly suspended, arms are not freeMore than a substitute; has been broadened to use as a training device
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Upper Limb Systems
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Reason for Hope: Predicting Outcome after Spinal Cord Injury
•I. Introduction•II. Neurological recovery•III. Breathing & walking•V. Residence•VI. Future research
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Residence and Life Satisfaction•87% of persons with acute SCI are discharged to a private residence in the community (Model Systems Data, University of Alabama/Birmingham)
•Why is that important?
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Which most affects Life Satisfaction?
Possibilities here--• Impairment—paraplegia, say vs
tetraplegia• Disability—ambulatory, vs using
a wheelchair• Handicap/level of societal role—
in an accessible vs inaccessible environment
Answer: Societal role• Greater life satisfaction of a
person with tetraplegia, using a wheelchair, in an accessible environment, than for a less impaired person in an inaccessible environment
• Cross cultural/cross generational(Dijkers, Spinal Cord, 1997)
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Importance of societal role/handicap
•“If they develop a cure for my spinal cord injury, I will take advantage of it, when I can fit it into my schedule.”
•A good outcome (per the patient) can occur without neurological recovery.
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Reason for Hope: Predicting Outcome after Spinal Cord Injury
•I. Introduction•II. Neurological recovery•III. Breathing & walking•V. Residence•VI. Future research
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Future research—stem cells•I. Framework for thinking of stem cells•II. Why would such a cell help?•III. Asterias•IV. Jefferson & Magee
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Basics•A stem cell can branch out to make different, more specialized cells neurons
•Where does one get a neural stem cell?•A goal: “Induced, pluripotent stem cell”
(no embryonic concerns, no immunosuppression)
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Why would a stem cell help?
Three patients• Chronic central cord syndrome
with loss C8/T1 hand muscles• A person with chronic
incomplete paraplegia• A person spinal cord injured two
weeks ago, with “swelling”
Three cell types• Neurons
• Myelin-producing cells
• Support cells
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“Asterias”•“OPC”•Help for early on•Collaborative with TJUH; Dr. Fried here as Principal Investigator; Mary Schmidt now in Atlanta meeting.
•A long-term view—15 years of follow-up
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15 year follow up ….
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