. Author manuscript; available in PMC: 2015 Nov 1.

Published in final edited form as: JAMA Neurol. 2014 Nov 1;71(11):1413–1420. doi: 10.1001/jamaneurol.2014.1432

Table 3. Electromyography Findings in the Proband (20-1).

Muscle, Left Side	Spontaneous				Voluntary Activity Comment on Motor Unit Potentials
Muscle, Left Side	Fibrillation Potentials/Positive Shar Waves		Fasciculation Potentials	Miscellaneous	Voluntary Activity Comment on Motor Unit Potentials
Tibialis anterior		+++	None	CRD	High amplitude, up to 5 mV; polyphasic and complex (some short)
Extensor digitorum brevis		++	None	None	Reduced number; polyphasic, large and complex
Vastus lateralis		++	None	None	Reduced number; long duration; high amplitude, up to 8 mV; polyphasic and complex
First dorsal interosseus	None		None	None	Large; high amplitude, up to 10 mV
Biceps	None		None	None	Polyphasic and complex
Deltoid		+	None	CRD	Long duration, high amplitude, complex in form
Infraspinatus		+	None	None	Large, polyphasic
Paraspinal midthoracic		+	None	Myotonia	Not examined
Paraspinal lumbar		++	None	None	Complex
Paraspinal cervical	None		None	None	Large, complex

Abbreviations: CRD, complex repetitive discharge; +, more than 1 area; ++, 2 or more areas; +++, every area.