Endplate noise
Irregular firing patern (hissing)
20-40hz
“sea shell”
source: mepp (monophasic negative)
Endplate spike
Irregular (sputtering)
5-50Hz
“sputtering fat in a frying pan”
source: muscle fiber (terminal axonal twig, bi/tri phasic initial negative)
Fibrillation
Regular
0.5-10Hz (occasionally 30Hz)
“Rain on a tin roof or tick-tock on a clock”
source: muscle fiber (spike, di/tri phasic, initial positive)
Positive sharp wave
Regular
0.5-10Hz (Occasinally 30Hz)
“dull pops, rain on a tin roof, tick-tock clock”
source: muscle fiber (diphasic, initial positive, slow negative)
Myotonia
Waxing/waning
20-150Hz
“revving engine”
source: muscle fiber (spike, initial positive)
CRD
Perfectly regular (unless overdriven)
5-100Hz
“machine”
source: multiple muscle fibers time linked together
Fasciculations
Irregular
0.1-10Hz
“Corn Popping”
source: motor unit
Myokymia
Bursting
1-5Hz (interburst), 5-60 Hz (intraburst)
“Marching soldiers”
source: motor unit
Cramp
Interference pattern or several individual units
20-150Hz
“ “
source: motor unit
Neuromyotonia
Waning
150-250Hz
“Pinging”
source: motor unit