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Cadwell phantom waveform??
My emg machine finally died, so I borrowed my friend's Cadwell Sierra Ascent. Works great besides for a phantom waveofrm with sensory studies. It always occurs around 1.2 ms at 8 cm or 1.5 ms at 10 cm. I think it's shock artifact but I'm not sure. I have the notch filter on, exam table unplugged, use a shielded shuttle cable, keep the electrode and stimulus cables away from each other, tried using the machine in different rooms, etc.
I attached the waveforms below (or at least I hope I did).
Does anyone know what this wavefore is and how I might get rid of it?
Many thanks!
Michael
Michael Kuo, MD
Vienna,
VAhttps://www.dropbox.com/s/uhwyuu3mn3ni40u/IMG_8236.jpg?dl=0
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