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Anal Sphincter EMG (Electromyography)

Anal sphincter electromyography (EMG) is recorded with a small sponge electrode in the anal canal. The person relaxes, squeezes and pushes. A computer records sphincter muscle electrical activity.

Anal sphincter EMG confirms the proper muscle contractions during squeeze and muscle relaxation during push. In people with non-relaxing puborectalis, the tracing of electrical activity gets bigger, instead of smaller, during a push.

Normal anal EMG activity with low anal squeeze pressures on manometry may indicate a torn sphincter muscle that could be repaired.