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Phys Agents Final Exam > Electrodiagnostic Testinh > Flashcards

Electrodiagnostic Testinh Flashcards

1
Q

What are the 4 component of motor unit analysis

A

Amplitude
Rise time
Duration
Phases

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2
Q

increased amplitude is seen in what

A

Innervation

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3
Q

Decreased amplitude is seen in what

A

Myopathies

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4
Q

Amplitude reflects what

A

Fiber density

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5
Q

What is the Normal MAUP amplitude range

A

300-5000 uV (5 mV)

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6
Q

MAUPS that are reduced below normal values (300 uV or less) are often observed with what

A

Myopathies

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7
Q

Is myopathic short or long duration

A

Short duration
< 5 milliseconds

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8
Q

Is neuropathic short or long duration

A

Long duration
> 15 milliseconds

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9
Q

What is the normal MAUP duration range

A

5-15 milliseconds

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10
Q

How many phases does a normal MAUP typically have

A

2-3 phases

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11
Q

How many phases does a polyphasic potential typically have

A

5 or more phases

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12
Q

What is a polyphasic potential

A

Typically in tissue that has been denervated

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13
Q

What is recruitment

A

Orderly addition of motor units to increase force of contraction

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14
Q

What are the two ways contractions become stronger

A

Increasing firing rate
Increasing number of motor units

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15
Q

What is decreased recruitment

A

Few motor units fire at increased rate

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16
Q

What is early recruitment

A

Myopathic conditions
A large number of motor units recruited for a minimal contraction

17
Q

T/f

Myopathic motor units cannot increase force output they quick,y recruit more motor units to increase contraction

A

True

18
Q

What are the four characteristics of needle electromyography

A

Insertional activity
Examination of muscle at rest
Moto unit analysis
Recruitment

19
Q

What is the normal insertional activity

A

150-300 milliseconds

20
Q

When a needle is placed in a muscle and stops moving would should happen to the muscle

A

If healthy, should be electrically silent

21
Q

What is decreased insertion activity

A

Atrophied muscle
<150 milliseconds

22
Q

What is increased insertional activity

A

> 300 milliseconds

Phys Agents Final Exam (9 decks)

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