Nerve conduction studies

Question 1

Best assessment of monosynaptic reflex

Answer 1

H wave

Question 2

Extraarticular manifestation of spondyloarthropathies

Answer 2

Uveitis, aortitis, upper lobe fibrosis, urethritis

Question 3

NCS in demyelinating lesions

Answer 3

slowed conduction velocity
conduction block
temporal dispersion
lower amplitudes
delayed/absent f waves

Question 4

NCS in axonal lesions

Answer 4

Low amplitudes, mild decrease in conduction velocity

Question 5

EMG in demyelination

Answer 5

Reduced recruitment in conduction block

Question 6

EMG in acute denervation

Answer 6

At rest - fibrillation potential, positive sharp waves, normal MUP
Recruitment - reduced (proportional to no of motor units lost)

Question 7

EMG in chronic denervation

Answer 7

At rest - no fibrillation
MUP - Increased amplitude and duration, polyphasic
Recruitment - reduced

Question 8

EMG in myopathy

Answer 8

At rest -silent
MUP - Decreased duration and amplitude, polyphasic
Recruitment- early