Peds NCS/EMG Flashcards
Myelination is complete by __
5 years of age
Lead, mercury and vincristine associated neuropathies are predominantly axonal o demyelinating?
Axonal
Organophosphates and arsenic associated neuropathies are predominantly axonal or demyelinating?
Demyelinating
Characteristics of MUAPs in myopathies
small amplitude, short duration (In infants and young children this may be a normal finding)
In infants, motor conduction velocities are ____ of the adult values. Adult values are reached by__
Half
3-5 years of age
peripheral nerve fibers reach the maximum diameter by
2 to 5 years
myelination starts at _____ weeks gestation and is complete by ___ years
10-15 weeks
5 years
routine nerve conduction studies involve
Myelinated Ia motor fibers and Ia sensory fibers
normal NCV in infants
20m/s
CMAP amplitudes reach adult values by
the end of first decade
SNAPs can have a 2 peak phenomenon until
4-6 years, indicates 2 groups of fibers that have different degrees of maturation
Small amplitude and short duration MUAPs is normal in infants
True
GBS
Sensorimotor
Slowed CV, temporal dispersion, segmental demyelination/remyelination, conduction block.
Earliest finding abnormal F waves
CMAP amplitudes being absent or less than 10% than unaffected side in brachialplexopathy highly correlates with significant weakness at 6 months
true
Lag time in the F wave, where there is no change from 1 to 3 years.
true
for sensory and motor studies the reference electrode is placed in on a separate digit
true
the H reflex of most nerve can be obtained in the infant due to lack of myelination, though they become increasingly difficult through the first year and only rarely after 1 year of life
True
vincristine neuropathy
axonal motosensory
cisplatin neuropathy
axonal sensory
Oxaliplatin neuropathy
sensory neuropathy, can also cause cramps, dysohagia, dyspnea. Spontaneous resolution if symptoms without changes doses.
lead neuropathy
axonal sensorimotor
