Clinical neurophysiology Flashcards Preview

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Flashcards in Clinical neurophysiology Deck (21)
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1
Q

What do EMGs detect?

A

Problems with peripheral nerves and muscle

2
Q

What does an EMG measure?

A

Conduction velocity

Amplitude

3
Q

How is an EMG carried out?

A

Very fine needle inserted into muscle to record activity

4
Q

What does a routine EMG look at?

A

Action potentials from whole motor units

5
Q

What does a single fibre EMG look at?

A

Isolate Paps from individual muscle fibres within a motor unit

6
Q

How does a single fibre EMG record 2 fibres within 1 unit?

A

2 needle positions

Filter, sensitivity and timebase settings

7
Q

What would a normal single fibre EMG result be?

A

Little variation

8
Q

What would a single fibre EMG result be in NMJ disease?

A

Jitter- tight relationship lost

9
Q

What does an EEG record?

A

Electrical activity within the brain generated by cortical neurones across multiple points on the scalp

10
Q

What can be seen on an EEG?

A

Epileptic activity
States of consciousness
Encephalopathy

11
Q

What are the types of evoked potentials?

A

Visual

Somatosensory

12
Q

What do evoked potentials investigate?

A

Problems in central pahways

13
Q

What do sensory studies allow measurement of?

A

Sensory and motor function seperately

14
Q

What is the process of sensory studies?

A

Stimulate sensory nerves in fingers

15
Q

What are the signs and symptoms of ulnar neuropathy?

A

Ulnar distrubution numbness

Wasting of small muscles

16
Q

What causes ulcer neuropathy?

A

Conduction block or slowing of impulse due to demyelination

17
Q

What is the presentation of C8 radiculopathy?

A

Small but normal pace motor response

Normal sensory response

18
Q

What gives diagnosis of nerve entrapment?

A

Neurophysiology and knowledge of anatomy

19
Q

What causes myasthesia gravis?

A

Antibodies against post synaptic nicotinic cholinergic receptors

20
Q

What is the presentation of myasthesia gravis?

A

Weakness, esp of eyes, fatigue

Normal sensation

21
Q

How is myasthesia gravis diagnosed?

A

Antibodies
Neurophysiology- repetitive stimulation
Single fibre EMG- jitter or block in more severe