Final NEURO Degenerative Flashcards
Explain the mechanism of Huntington Disease
Results in altered Huntington protein that damages neurons
What is Huntington disease? Genetic
Inherited disease
Autosomal dominant gene
Carried on Huntington gene (chromosome 4)
When does Huntington manifests?
Does not usually manifest until 3rd to 5th
In Huntington’s Disease there is
Progressive atrophy of brain
Particularly in caudate nucleus
Huntington’s Disease and neurotransmitters
Depletion of GABA in the basal nuclei
Reduced levels of ACh in the brain
How is huntington’s disease diagnosed?
DNA analysis for the protein mutation
Huntington’s disease Cure?
No cure
Supportive treatments
Huntington’s disease Treatment: Medication use?
Tetrabenazine – suppresses hyperkinetic movements (central monoamine depleting agent)
Huntington Disease Anesthesia Considerations: Airway
Dysphagia & ↑ risk of aspiration
Huntington Disease Anesthesia Considerations: Depolarizing agents
Caution with Succinylcholine- ↑ sensitivity
Huntington Disease Anesthesia Considerations: NONDepolarizing agents
↑ ↑ ↑ sensitivity to nondepolarizing muscle relaxants
– titrate carefully
Huntington Disease Anesthesia Considerations: Prepare for
Prepare pt. and family for poss. Post-op. Ventilation
Explain the mechanism of Myasthenia Gravis
Auto-antibodies attack ACh receptors @ NMJ
Skeletal muscle weakness (without atrophy)
Ocular & facial muscles usually affected first
Explain the mechanism of Myasthenia Gravis
Auto-antibodies attack ACh receptors @ NMJ
Skeletal muscle weakness (without atrophy)
Ocular & facial muscles usually affected first
What are the signs and symptoms of Myasthenia Gravis?
PSW CD
Ptosis, diplopia Slurred speech, dysphagia, aspiration Weakness in arms & legs Chronic muscle fatigue Difficulty breathing
DIAGNOSIS Myasthenia Gravis Diagnostic tests:
Electromyography
Serum antibody test
Edrophonium (acetylcholinesterase inhibitor) temp. reversal
Treatment of Myasthenia Gravis : Medications primary
Anticholinesterase agents
Pyridostigmine
Treatment of Myasthenia Gravis : Steroids
Glucocorticoids
Suppress immune system
Myasthenia Gravis: Surgery
Thymectomy (70% of cases have thymus hyperplasia)
Treatment of Myasthenia Gravis: Antibodies
Plasmaphoresis (Removal of antibodies from the blood)
Myasthenia Gravis – Anesthesia : What can aggravate Myasthenia?
Aminoglycosides (aggravate MG)
For Myasthenia, When is Post-op. ventilation required?
DPDV
Disease with duration > 6 yrs.
Presence of COPD
Daily dose of pyridostigmine > 750mg
Vital capacity < 2.9 L
Do all patients with Myasthenia gravis require Post op ventilation?
NO
Myasthenia Gravis – Anesthesia
Pts may be resistant to
succinylcholine
Myasthenia Gravis avoid preop
Avoid opioids pre-op. (respiratory effects)
Myasthenia Gravis and IV anesthetic?
Use short-acting IV anestheic for induction
Consider intubation without muscle relaxants
Myasthenia Gravis and NDNMB
↑ sensitivity to nondepolarizing muscle relaxants – if used, initial dose should be titrated to response according to
peripheral nerve stimulator.
Myasthenia Gravis: Atracurium and vecuronium
potency is increased twofold compared to response in normal pt.
For Myasthenia Gravis, If maintenance requires nondepolarizing drugs,
decrease intial dose by half to two thirds
Your patient has recent changes that include loss of arm swings when walking and absence of head rotation when turning the body. A loss of facial expression, and decreased emotional response is also noted. what would these signs indicate?
Parkinson’s Disease
Loss of facial expression, and decreased emotional response
Parkinson’s Disease
Mechanism of the Disease PARKINSON’S: what is it?
Progressive degeneration of the substantia nigra in the
midbrain
Parkinson’s and location of dopamine production
Substantia nigra normally produces Dopamine which
controls unwanted movements
Parkinson’s and Dopamine
↓ Dopamine leads to unopposed firing of LMNs & tremor
Parkinson’s and CLASSIC Triad of major signs:
Rigidity (first in neck muscles)
Akinesia
Tremor
Treatment of Parkinson’s (DAA SPOT)
Dopamine replacement therapy with Levodopa w/
decarboxylase inhibitor (prevents peripheral conversion)
Anticholinergic drugs
Amantadine
Speech and language pathologist
PT
OT ( Improve balance, coordination)
What is the role of Decarboxylate inhibitor in Parkinsons?
decarboxylase inhibitor (prevents peripheral conversion)
Medication management for the patient with Parkinson’s undergoing surgery? When should it be administered?
Parkinson Disease – Anesthesia Mgmt.
Maintain Levodopa peri-op.
- Oral levodopa can be administered ~20 min. before inducing anesthesia
Anesthesia considerations with Parkinson’s Interruption of levodopa?
Interruption of therapy can lead to muscle rigidity interfering with lung ventilation
Important anesthesia considerations for Parkinson’s
What medication to avoid?
Avoid Butyrophenones - antagonize effects of dopamine
ex. droperidol, haloperidol
Hemodynamics instability for the patient with parkinson’s disease ?
Hypotension & cardiac arrhythmias possible during
anesthesia
Your patient is a 27 year old who states that she has been experiencing, numbness, tingling, and burning that started in legs and later included her arms. She has also begun to notice some loss of coordination and vision disturbances. Her MRI Appears below? What does it indicate?
Multiple Sclerosis
Tests that can be ordered to diagnosis MS? (MECE)
MRI for diagnosis and monitoring
Evoked potential tests (VER)
CSF (antibodies, abnormal cells)
EEG if seizures present
Seizures and Multiple Sclerosis
Increase incidence of Seizures in MS patiens
Explain the mechanism of Multiple Sclerosis : Progressive
Progressive autoimmune demyelination of CNS neurons &
Cranial Nerves
Explain the mechanism of Multiple Sclerosis loss of
Loss of myelin interferes with conduction of impulses
Affects motor, sensory, & autonomic fibers
Occurs in diffuse patches in the nervous system
Course of MS
Course variable: subacute w/ relapse and remission or
chronic and aggressive
MS Cure? and what is the role of treatment options
No cure. Treatments control symptoms and slow progression.
MS medications for treatments?
Corticosteroids
Interferon β
Low-dose Methrotrexate
PT, OT
MS Anesthesia Considerations:and the Use of SPINAL ANESTHESIA? which one do not cause that effect?
Spinal anesthesia known to cause Post-op. exacerbations
Epidural and peripheral blocks usually do not
MS and GA
General anesthesia usually tolerated well
MS and SUCC
Avoid succinylcholine - ↑ risk of hyperkalemia
MS and Steroids
Continue steroids peri-op.
Amyotrophic Lateral Sclerosis (ALS) - AKA
Lou Gehrig disease
ALS cause and genetic
No identified cause
Genes on various chromosomes have been linked to the
disease
ALS Mechanism of disease
Progressive degenerative disease affecting upper motor
neurons in the cerebral cortex and lower motor neurons in
brainstem and spinal cord (at anterior horns)
Inflammation and cognition in ALS
No indication of inflammation around the nerves
Cognition unimpaired
Amyotrophic Lateral Sclerosis (ALS) Anesthesia Considerations: GETA
General anesthesia associated with exaggerated ventilatory depression
ALS and SUCC
Avoid Succinylcholine (↑ risk of hyperkalemia)
ALS and NDNMB –> There is
prolonged response to nondepolarizing muscle relaxants