EMG: myotonic runs

What it means

Spontaneous, repetitive electrical activity demonstrated by electromyography (EMG).

This is a characteristic abnormality seen in the myotonias and periodic paralyzes.

Rare diseases that can present with this2

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: EMG: spontaneous, repetitive electrical activity