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43 Cards in this Set
- Front
- Back
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What percentage of patients with IBM may have a mild sensory or sensorimotor polyneuropathy?
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1/3 to 1/2
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What are the types of electrodiagnostic findings possible in IBM?
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Grp 1: small short MUAP with polys
Grp 2: small short or large long poly (both may be present in same muscle) Grp 3: normal or long large |
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What are the four categories of NMJ disorders possible?
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1) Immune: MG or LEMS
2) Toxic: Snake venom (alpha/beta bungarotoxin, banded krait), tick paralysis (dermatocanter), botulism, organophosphate poisoning Metabolic: Hypergmagnesemia Congenital |
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What is myasthenic speech?
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nasal due to weakness of the soft palate?
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What setting should be used for Low Frequency High pass filter on SF EMG?
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500 HZ because you are trying to ignore all the distal muscles and only capture the muscles close to the needles
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What are the normal settings for EMG for LF or high pass filters?
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Normal settings are 10 HZ
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What criteria need to be accepted to analyze the motor units on SFEMG?
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at least 200 microvolts amplitude and less than 300 msec rise time
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If you see repetitive CMAP after single stimulus what diagnosis should be considered?
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endplate acetylcholinesterase deficiency
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What temperature is necessary for adequate interpretation of RNS?
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>33 degrees celsius
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What are the 3 possibilities for NCS with low amplitude CMAP and normal conduction velocity?
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!) Axonal polyneuropathy
2) LEMS 3) myopathy |
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What is the nromal latency for medial plantar nerves?
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less than 3.7 msec
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What is the normal latency for lateral plantar nerves?
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less than 3.7 msec
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What is the normal amplitude for medial plantar nerves?
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more than 3 mv
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What is the normal amplitude for lateral plantar nerves?
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more than 3 mv
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Where should the mentalis muscle be needled?
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purse the lips and go tangential just above and lateral to the chin
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Where should you needle the orbicularis oculi muscle?
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lateral to the inferior ridge of the orbit away from the eye superficial/tangential, close hte eye to activate
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Where should you needle the frontallis muscle?
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mid eye brow 2 fingerbreadths above, raise eyebrow to activate, tangential/superficcial
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Where do you needle the masseter?
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Feel the angle of jaw go 2 fingerbreadths anterior and a little above, try to avoid parotid gland
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What are the origins of the radial nerve?
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upper middle lower trunk
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What is the normal CMAP for EIP?
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2-5 mv
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Where should you needle the orbicularis oculi muscle?
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lateral to the inferior ridge of the orbit away from the eye superficial/tangential, close hte eye to activate
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Where should you needle the frontallis muscle?
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mid eye brow 2 fingerbreadths above, raise eyebrow to activate, tangential/superficcial
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Where do you needle the masseter?
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Feel the angle of jaw go 2 fingerbreadths anterior and a little above, try to avoid parotid gland
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What are the origins of the radial nerve?
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upper middle lower trunk
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What is the normal CMAP for EIP?
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2-5 mv
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Where should you needle the orbicularis oculi muscle?
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lateral to the inferior ridge of the orbit away from the eye superficial/tangential, close hte eye to activate
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Where should you needle the frontallis muscle?
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mid eye brow 2 fingerbreadths above, raise eyebrow to activate, tangential/superficcial
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Where do you needle the masseter?
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Feel the angle of jaw go 2 fingerbreadths anterior and a little above, try to avoid parotid gland
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What are the origins of the radial nerve?
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upper middle lower trunk
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What is the normal CMAP for EIP?
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2-5 mv
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What are some considerations in evlauating the CMAP for radial nerve?
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there may be an initial positive deflection due to volume conduction from nearby radial innervated muscles; conduction velocity is inaccurate due to above as well as inaccuracy of surface distance meassurements
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Where should you needle the orbicularis oculi muscle?
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lateral to the inferior ridge of the orbit away from the eye superficial/tangential, close hte eye to activate
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Where should you needle the frontallis muscle?
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mid eye brow 2 fingerbreadths above, raise eyebrow to activate, tangential/superficcial
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Where do you needle the masseter?
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Feel the angle of jaw go 2 fingerbreadths anterior and a little above, try to avoid parotid gland
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What are the origins of the radial nerve?
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upper middle lower trunk
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What is the normal CMAP for EIP?
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2-5 mv
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How can one tell the difference between nascent (early reinnervation) units and myopathic units on EMG?
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recruitment should be normal or early in myopathic
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What are the branches of the VII cranial nerve?
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greaterpetrosal nerve pterygopalatine ganglion
lesser petrosal nerve geniculate ganglion stapedius chorda tympani post belly digastric, stylohyoid temporal: frontalis zygomatic: orbicularis oculi mandibular: masster buccal: orbicularis oris cervical: platysma |
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What is the normal amplitude of the facial nerve muscles?
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1 mv
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What is the normal latency for facial nerve muscles?
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less than 3.1 mseconds
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What is the normal R1 latency for blink reflex?
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less than 13 msec
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What is the normal ipsi R2 latency?
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less than 41 msec
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What is the normal contra R2 latency?
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less than 44 msec
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