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.