1. Electromyography Nerve conduction study (NCS) Electromyography (EMG) Evoked potential study (EP)

2. Abnormal Wave Latency (msec) Amplitud e (uV) - + Decreased amplitude: axonal/neuronal damage ;axono- /neuronopathy Prolonged latency, decreased velocity: myeline damage ;demyelination A B C

3. Nerve Conduction Study Motor NCS Sensory NCS Reflex study –F-wave –H-reflex –Blink reflex Repetitive nerve stimulation study

4. Electromyography Needle EMG –Conventional needle EMG –Quantitative EMG –Single Fiber EMG Surface EMG

5. Mortor NCS

6. Axonal degeneration vs Demyelination CharaterAxonalDemyelinating NCVN  Amplitude  N or CB DurationNDispersion(  ) F-latency 

7. F-wave, H-reflex

8. Blink reflex

9. RNS

10. Electromyography Insertional activity Spontaneous activity –Positive sharp wave –Fibrillation potential –Fasciculation Motor unit potential Recruitment

12. Amplitude Duration Phase

13. Neuropathy vs Myopathy CharacterNeuropathyMyopathy IA   SPA(+)(+)(-) MUP amp  duration  phase  Recruitment 

14. - Peripheral neuropathy: DM, Entrapment neuropathy, Radiculopathy, Guillain-Barre syndrome (AIDP), CIDP - Motor neuron disease: ALS, PLS - Myopathy: inflammaotory polymyositis, dermatomyositis - Neuromuscular junction disoder (Myasthenia gravis, Lambert-Eaton syndromes): Repetitive nerve stimulation test (Jolly test) - Autonomic function test and sphincter EMG: MSA vs. IPD - Blink reflex and facial NCS: Bell’s palsy, Trigeminal neuralgia, Blephalospasm Clinical utility of EMG and NCS