Insertional and Spontaneous EMG Activity

Insertional and Spontaneous EMG Activity Back to EMG main page

Volume II (Second Edition) : Atlas of EMG Waveforms
Chapters 2-4: Insertional and Spontaneous EMG Activity

Objectives
1 - Recognize normal insertional activity.
2 - Identify endplate noise, fibrillations, positive sharp waves, and fasciculations.
3 - Review "uncommon" waveforms of fibrillations and positive sharp waves.
4 - Demonstrate transformation from fibrillation to PSW and vice versa.
5 - Recognize and differentiate complex repetitive discharge, myotonia, neuromyotonia and myokymia.
6 - Observe Cramp Discharge
7 - Characterize extra discharges.

Insertional Activity	Normal IA	Reduced IA
	Increased IA
FIBs / PSWs	Waveforms	FIB = PSW
	Unusual Configurations	Profused FIBs and PSWs
	Pathophysiology	Interpretation
Endplate Activity	Electrophysiology	Miniature Endplate Potentials
	Endplate Spikes	Significance
Complex Repetitive Discharge	How it is generated	Ephaptic Transmission
	Change in Configuration	Simple Iterative Discharge
Myotonic Discharge	Waxing and Waning	Percussion Myotonia
Myokymic Discharge	Continuous Pattern	Marching Band
Neuromyotonic Discharge	The PING Sound	Associated with MUP
Cramp Discharge	Resembles Interference Pattern	Fast Firing Motor Units
Extra Discharge	Change in IDI	Multiplets
Fasciculations	Slow and Irregular Pattern	Single Motor Unit