Spontaneous activity at rest

100^V

100^V

10ms

Fibrillation potentials are due to single muscle fibre contraction and indicate active denervation. They usually occur in neurogenic disorders, e.g. neuropathy.

100/iV

100/iV

10ms

Positive sharp waves

Slow negative waves preceded by sharp positive spikes. Seen in chronically denervated muscle, e.g. motor neuron disease, but also in acute myopathy, e.g. polymyositis. These waves probably represent injury potentials.

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