Peds NCS/EMG

Question 1

Myelination is complete by __

Answer 1

5 years of age

Question 2

Lead, mercury and vincristine associated neuropathies are predominantly axonal o demyelinating?

Answer 2

Axonal

Question 3

Organophosphates and arsenic associated neuropathies are predominantly axonal or demyelinating?

Answer 3

Demyelinating

Question 4

Characteristics of MUAPs in myopathies

Answer 4

small amplitude, short duration (In infants and young children this may be a normal finding)

Question 5

In infants, motor conduction velocities are ____ of the adult values. Adult values are reached by__

Answer 5

Half

3-5 years of age

Question 6

peripheral nerve fibers reach the maximum diameter by

Answer 6

2 to 5 years

Question 7

myelination starts at _____ weeks gestation and is complete by ___ years

Answer 7

10-15 weeks

5 years

Question 8

routine nerve conduction studies involve

Answer 8

Myelinated Ia motor fibers and Ia sensory fibers

Question 9

normal NCV in infants

Answer 9

20m/s

Question 10

CMAP amplitudes reach adult values by

Answer 10

the end of first decade

Question 11

SNAPs can have a 2 peak phenomenon until

Answer 11

4-6 years, indicates 2 groups of fibers that have different degrees of maturation

Question 12

Small amplitude and short duration MUAPs is normal in infants

Answer 12

True

Question 13

GBS

Answer 13

Sensorimotor
Slowed CV, temporal dispersion, segmental demyelination/remyelination, conduction block.
Earliest finding abnormal F waves

Question 14

CMAP amplitudes being absent or less than 10% than unaffected side in brachialplexopathy highly correlates with significant weakness at 6 months

Answer 14

true

Question 15

Lag time in the F wave, where there is no change from 1 to 3 years.

Answer 15

true

Question 16

for sensory and motor studies the reference electrode is placed in on a separate digit

Answer 16

true

Question 17

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

Answer 17

True

Question 18

vincristine neuropathy

Answer 18

axonal motosensory

Question 19

cisplatin neuropathy

Answer 19

axonal sensory

Question 20

Oxaliplatin neuropathy

Answer 20

sensory neuropathy, can also cause cramps, dysohagia, dyspnea. Spontaneous resolution if symptoms without changes doses.

Question 21

lead neuropathy

Answer 21

axonal sensorimotor