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Quiz RNS
57EMG: Myasthenia?
Patient with bilat ptosis but no arm or leg weakness. RNS in nasalis and deltoid normal.
SFEMG in orb oculi and frontalis normal.
1. Ocular MG
2. Generalized MG
3. Myopathy
4. Bell palsy
Normal SFEMg findings are strong indications that symptoms are NOT MG. In this case, it may be
a myopathy, often with very little of jitter abnormalities
57EMG: Myasthenia?
Patient with bilat ptosis but no arm or leg weakness. RNS in nasalis and deltoid normal.
SFEMG in orb oculi and frontalis normal.
1. Ocular MG
2. Generalized MG
3. Myopathy
4. Bell palsy
Normal SFEMg findings are strong indications that symptoms are NOT MG. In this case, it may be
a myopathy, often with very little of jitter abnormalities
Q 40. Which is the optimal time for maximal voluntary
activation in RNS tests in MG and LEM respectively?
1
Q 40. Which is the optimal time for maximal voluntary
activation in RNS tests in MG and LEM respectively?
45-60 sec to provoke MG exhaustion
10 sec to see LEM facilitation
1
RNS
• Is the head moving when you perform correctly RNS from trapezius
muscle (stim behind the sternocleid muscles)? NO, move stim
• Is it normal to have some degree of “biting” when you perform RNS
of the nasalis muscle? If not, what to do?
No, direct stim of masseter muscle, move stim
1
RNS
• Is the head moving when you perform correctly RNS from trapezius
muscle (stim behind the sternocleid muscles)? NO, move stim
• Is it normal to have some degree of “biting” when you perform RNS
of the nasalis muscle? If not, what to do?
No, direct stim of masseter muscle, move stim
1
Q 43. Tests of LEM?
The important finding is strong facilitation (> 60% amplitude
increase)
This is accomplished by
1. 10 sec voluntary activation
or
2. Stim 20 (-50) Hz for 1 sec. Note, the facilitation should be
assessed from the amplitude obtained after first single
stimulus after the train.
(during the train the muscle is shortening, which changes the
amplitude by up to 40%)
8
Q 43. Tests of LEM
The important finding is strong facilitation (> 60% amplitude
increase)
This is accomplished by
1. 10 sec voluntary activation
or
2. Stim 20 (-50) Hz for 1 sec. Note, the facilitation should be
assessed from the amplitude obtained after first single
stimulus after the train.
(during the train the muscle is shortening, which changes the
amplitude by up to 43%)
9
1
Which muscles are tested?
APB
trap
nasalis
1
47-årig kvinna
ANAMNES
• previously healthy
• since 3 months increasingly weak
• cab walk 200 m, subjectively weaker right side
• last month in wheelchair
• hoarse, swallowing difficulties
• orthostatic hypotension
• obstipated
CLINICAL:
• fatigable neck muscles
• wean leg muscles
• no atrophy of facial muscles
• areflexia
Q3
NCS: motor nerves
Q3
Repetitive nerve stimulation: m. ADM sin
Q3
SFEMG: m. orbicularis oculi
Q3
CT thorax – normal
VGCC antibodies – positive
Diagnosis?
a. MG
b. LEM
c. axonal neuropati
d. AMAN
e. post polio syndrom
Q3

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QUIZ RNS

  • 2. 57EMG: Myasthenia? Patient with bilat ptosis but no arm or leg weakness. RNS in nasalis and deltoid normal. SFEMG in orb oculi and frontalis normal. 1. Ocular MG 2. Generalized MG 3. Myopathy 4. Bell palsy Normal SFEMg findings are strong indications that symptoms are NOT MG. In this case, it may be a myopathy, often with very little of jitter abnormalities
  • 3. 57EMG: Myasthenia? Patient with bilat ptosis but no arm or leg weakness. RNS in nasalis and deltoid normal. SFEMG in orb oculi and frontalis normal. 1. Ocular MG 2. Generalized MG 3. Myopathy 4. Bell palsy Normal SFEMg findings are strong indications that symptoms are NOT MG. In this case, it may be a myopathy, often with very little of jitter abnormalities
  • 4. Q 40. Which is the optimal time for maximal voluntary activation in RNS tests in MG and LEM respectively? 1
  • 5. Q 40. Which is the optimal time for maximal voluntary activation in RNS tests in MG and LEM respectively? 45-60 sec to provoke MG exhaustion 10 sec to see LEM facilitation 1
  • 6. RNS • Is the head moving when you perform correctly RNS from trapezius muscle (stim behind the sternocleid muscles)? NO, move stim • Is it normal to have some degree of “biting” when you perform RNS of the nasalis muscle? If not, what to do? No, direct stim of masseter muscle, move stim 1
  • 7. RNS • Is the head moving when you perform correctly RNS from trapezius muscle (stim behind the sternocleid muscles)? NO, move stim • Is it normal to have some degree of “biting” when you perform RNS of the nasalis muscle? If not, what to do? No, direct stim of masseter muscle, move stim 1
  • 8. Q 43. Tests of LEM? The important finding is strong facilitation (> 60% amplitude increase) This is accomplished by 1. 10 sec voluntary activation or 2. Stim 20 (-50) Hz for 1 sec. Note, the facilitation should be assessed from the amplitude obtained after first single stimulus after the train. (during the train the muscle is shortening, which changes the amplitude by up to 40%) 8
  • 9. Q 43. Tests of LEM The important finding is strong facilitation (> 60% amplitude increase) This is accomplished by 1. 10 sec voluntary activation or 2. Stim 20 (-50) Hz for 1 sec. Note, the facilitation should be assessed from the amplitude obtained after first single stimulus after the train. (during the train the muscle is shortening, which changes the amplitude by up to 43%) 9
  • 12. 47-årig kvinna ANAMNES • previously healthy • since 3 months increasingly weak • cab walk 200 m, subjectively weaker right side • last month in wheelchair • hoarse, swallowing difficulties • orthostatic hypotension • obstipated CLINICAL: • fatigable neck muscles • wean leg muscles • no atrophy of facial muscles • areflexia Q3
  • 16. CT thorax – normal VGCC antibodies – positive Diagnosis? a. MG b. LEM c. axonal neuropati d. AMAN e. post polio syndrom Q3