Criteria for Abnormality

SSEP

-10% increase in latency

-50% decrease in amplitude

-stable anesthesia

 

EMG

-Sustained train of activity

 

Evoked EMG

-Screw stimulation threshold <10mA

 

Hypogastric Plexus Monitoring

-Sustained train of activity

 

Motor Evoked Potentials

-Greater than 100% increase in threshold

-Stable anesthesia

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