Neuro Eval of Children Flashcards
how to test motor system
tone assessment more important than strength; resistance to passive movement
things to assess in history
pregnancy, labor, and deliver
prenatal factors
pre and perinatal factors (genetics, family history)
perinatal events
tone is what relatd
state
- SPINAL MUSCULAR ATROPHY
genetcs
Autosomal recessive–• Locus on 5q13, containing (SMN1) identified as the SMA disease gene
how does SMN1 work
• SMN1 duplicated with highly homologous copy SMN2; both transcribed
–SMN2 gene present in SMA pts but not able to compensate for SMN1 deficiency
enough copes of SMN2
older onset or dsease goes away
s/s of spnal muscular atophy
Symmetric mm. weakness Atrophy
Absent DTR
Tongue fasciculations
Tremor –
SMA • Werdnig-Hoffman disease
type 1
infantile onset
• Weakness, hypotonia within first 6 months
• Death in first 2 years; No treatment
SMA type 2
(intermediate)
• Sit, cannot stand or walk
SMA type 3
(Kugelberg-Welander) – Proximal weakness after 18 months
• Walk, do not run
charcot mare tooth
• Most commonly inherited peripheral neuropathy
CMT etology
Majority are AD (CMT1 and CMT 2)
• Peripheral nervous system myelin protein mutations (PMP22)
• Includes all peripheral nerves
how does PMP 22 work?
• If mutated → Loose/floppy myelin destroyed by the body b/c it is not tightly wound, compacted
s/s CMT
- Progressive distal weakness, foot drop
- Steppage gait
- Mild sensory loss
- Depressed DTRs, heelcord contractures, high arches with hammer toes
- Inverted champagne bottle legs – Muscular thigh with skinny gastrocnemius
prognoss CMT
normal lfespan
Tx CMT
• Orthopedic support, bracing
Congenital forms MG
- Transient neonatal (mother with MG) via passive transfer of Abs
- Congenital MG: some other defect at the NMJ
Dystrophin
very large subsarcolemmal protein that acts as a “shock absorber”
lack of dystrphn
→ muscle contracts → membrane will fracture
Dystrophin associated proteins (DAPs):
transmembrane and extracellular complexes